Plastic bag on roll packaging machine

Abstract

The invention discloses a continuous roll plastic bag packaging machine, comprising a frame, wherein a continuous roll plastic bag placing driving mechanism is arranged in the frame; a main conveying roller is arranged on the upper part of the frame, a mounting frame is arranged above the frame, the mounting frame is movably connected with the frame, and a slave conveying roller corresponding to the main conveying roller is mounted on the mounting frame; below the main conveying roller, a heating element for sealing the plastic bag is arranged on the frame; a push rod is corresponding to the heating element, and the plastic bag passes between the push rod and the heating element, and the push rod pushes the plastic bag to the heating element for heating and sealing; the push rod is arranged on a left guide rod and a right guide rod, the left guide rod and the right guide rod are arc-shaped, and the left guide rod and the right guide rod are driven by a guide rod power device; the packaging machine of the invention has high space utilization rate and small volume, and is suitable for different, especially smaller packaging environments; it is convenient to discharge materials and wear bags, and the packaging efficiency is improved.

Description

Technical Field

[0001] The invention relates to a roll plastic bag packaging machine, which is used for automatically and continuously packaging articles (such as express articles, etc.). Background Art

[0002] With the rapid development of the logistics industry, packaging machines have emerged in order to package items quickly and efficiently, and packaging machines have realized the automation of item packaging. For example, the patent document with the publication (announcement) number CN204587428U discloses a continuous roll plastic bag packaging machine, which includes a conveying device and a sealing device for conveying plastic bags. The conveying device is composed of an upper conveying shaft and a lower conveying shaft, and a gap is left between the upper conveying shaft and the lower conveying shaft for the plastic bag to pass through; the sealing device is located downstream of the conveying direction of the conveying device, and after the conveying device conveys the plastic bag, the sealing device seals the plastic bag. The packaging machine realizes automatic and continuous packaging of items, saves human resources, and realizes the automation of item packaging.

[0003] Although the currently used packaging machines can package articles quickly and efficiently and realize the automation of article packaging, such packaging machines are not only large in size and low in space utilization, but also extremely inconvenient to place the continuous roll plastic bags, which affects the work efficiency. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a continuous roll plastic bag packaging machine, which has small volume and high space utilization.

[0005] In order to solve the above technical problems, the continuous roll plastic bag packaging machine of the present invention includes a frame, a continuous roll plastic bag placing drive mechanism is arranged in the frame, the continuous roll plastic bag placing drive mechanism is used to place the continuous roll plastic bag and drive the continuous roll plastic bag to rotate and unwind; above the continuous roll plastic bag placing drive mechanism, a main conveying roller is arranged on the upper part of the frame, and the main conveying roller is driven by the main conveying roller power device; above the frame is a mounting frame, the mounting frame is movably connected to the frame, and a slave conveying roller corresponding to the main conveying roller is installed on the mounting frame; the mounting frame is movably connected to the frame to realize a split design, which is not only convenient for bag threading work, but also convenient for the continuous roll plastic bag to be placed inside the machine body. Below the main conveying roller, a heating element for sealing plastic bags is arranged on the frame; the heating element corresponds to a push rod, and the plastic bag passes between the push rod and the heating element, and the push rod pushes the plastic bag to the heating element for heating and sealing; the push rod is installed on the left guide rod and the right guide rod, and the left guide rod and the right guide rod are arc-shaped, and the left side of the frame has a left walking channel for the left guide rod to walk, and the right side of the frame has a right walking channel for the right guide rod to walk, and the left guide rod and the right guide rod are driven by a guide rod power device.

[0006] The continuous roll plastic bag is placed on the driving mechanism, and the continuous roll plastic bag is driven to rotate and unwind at the same time. Before work, the mounting frame is lifted from the frame, and the plastic bag is directly placed on the main conveying roller, and then the mounting frame is lowered. At this time, the plastic bag is between the secondary conveying roller and the main conveying roller, and there is no need to pass the plastic bag through the secondary conveying roller and the main conveying roller, and there is no need for a complex structure to separate the secondary conveying roller from the main conveying roller before the bag passing work. The main conveying roller and the secondary conveying roller rotate, and the plastic bag is transported between the heating element and the push rod, and the items to be packaged are placed in the plastic bag with a single-sided opening. The left guide rod and the right guide rod move along the left walking channel and the right walking channel respectively, and the left guide rod and the right guide rod drive the push rod to move toward the heating element, pushing the transported plastic bag to the heating element, and the heating element works to achieve heat sealing of the plastic bag. At this time, the plastic bag is clamped between the push rod and the heating element, and the main conveying roller and the slave conveying roller are reversed to separate the single sealed plastic bag from the rolled plastic bag (separated along the tearing line), completing a packaging process.

[0007] Specifically, the roll plastic bag placement drive mechanism includes a left track plate and a right track plate, which are respectively installed on the left and right sides of the frame, and both of the left track plate and the right track plate have an arc track groove; a placement shaft is arranged in the arc track groove of the left track plate and the right track plate (that is, one end of the placement shaft is placed in the arc track groove of the left track plate, and the other end of the placement shaft is placed in the arc track groove of the right track plate); a roll drive shaft is arranged in the frame, and the roll drive shaft is driven to rotate by a roll power device, and the roll drive shaft is parallel to the placement shaft, and the roll drive shaft drives the roll plastic bag on the placement shaft to rotate and unwind along the placement shaft. When the roll plastic bag is continuously unrolled and the thickness is continuously reduced, since the placement shaft is placed in the arc track groove, the placement shaft continuously approaches the roll drive shaft along the arc track groove, so that the roll plastic bag is always in contact with the roll drive shaft, and the roll drive shaft rotates, which can always drive the roll plastic bag to rotate and unwind along the placement shaft.

[0008] As a preference, the main conveying roller power device is a motor, but the main conveying roller power device is not limited to a motor, and any component in the prior art that can achieve driving can be used.

[0009] In order to play a buffering role, the heating element is installed on the heating strip, and the heating strip is installed on the frame through the spring element, so that the heating element and the push rod are always in contact, which is conducive to sealing. There is another important function: when the main conveying roller and the secondary conveying roller reverse to separate the plastic bags, if the connection between the single plastic bag and the rolled plastic bag is firm, due to the installation through the spring element, there is a certain buffer distance, the motor driving the main conveying roller will not be locked and burned, and the single plastic bag can be separated smoothly when rotating at the buffer distance.

[0010] Specifically, the heating element is preferably an electric heating wire, but the heating element is not limited to the electric heating wire, and any element in the prior art such as an electric heating block can be used as long as it can achieve heat sealing. At the same time, in order to make the plastic bag close to the electric heating element and improve the heat sealing efficiency, the push rod is installed with a soft rubber strip (high temperature resistant), and the soft rubber strip also has a certain buffering effect.

[0011] On the left side of the frame, the left walking channel includes left guide wheels distributed up and down, at least two left guide wheels are distributed on the top, at least two left guide wheels are distributed on the bottom, and the left guide rod is located between the upper left guide wheel and the lower left guide wheel. Similarly, on the right side of the frame, the right walking channel includes right guide wheels distributed up and down, at least two right guide wheels are distributed on the top, at least two right guide wheels are distributed on the bottom, and the right guide rod is located between the upper right guide wheel and the lower right guide wheel. Further, in order to limit the movement of the left guide rod and the right guide rod, the wheel surface of the left guide wheel has a left walking groove, the upper surface and the lower surface of the left guide rod both have a left protrusion, and the left protrusion is located in the left walking groove. Similarly, the wheel surface of the right guide wheel has a right walking groove, the upper surface and the lower surface of the right guide rod both have a right protrusion, and the right protrusion is located in the right walking groove. The left guide rod and the right guide rod respectively travel in the left and right walking channels formed by the left and right guide wheels, saving the layout space of the components. At the same time, the left guide rod and the right guide rod are arc-shaped, and when the left guide rod and the right guide rod are located in the machine body, the space utilization rate is improved; since the left guide rod and the right guide rod are arc-shaped, when they are extended, the position of the push rod drops, reducing interference with the packaged items.

[0012] In order to realize the pushing rod action, the guide rod power device is a guide rod motor, and the left guide rod and the right guide rod are both provided with driving teeth. The driving teeth of the left guide rod and the right guide rod are respectively meshed with the left guide rod gear and the right guide rod gear. The guide rod motor drives the left guide rod gear and the right guide rod gear to rotate, and the left guide rod gear and the right guide rod gear drive the left guide rod and the right guide rod to extend and retract through the driving teeth, thereby driving the pushing rod action.

[0013] Preferably, one side of the mounting frame is movably connected to the frame via a hinge. At this time, in order to fix (lock) the mounting frame on the frame, a fixing piece is provided on the other side of the mounting frame, and the fixing piece fixes the mounting frame to the frame. Under normal conditions, the fixing piece fixes the mounting frame to the frame. When necessary, the fixing piece can make the mounting frame and the frame in a non-fixed state, so that the mounting frame can be lifted. Specifically, the fixing piece includes at least one engaging plate, and if there are two engaging plates, the two engaging plates are respectively arranged on the left and right sides of the mounting frame. The engaging plate has a sliding groove, and the sliding groove has a screw, and the screw is installed on the mounting frame; the end of the engaging plate has an engaging notch, and the engaging notch has a limiting rod, and the limiting rod is installed on the frame; the end of the engaging plate is provided with an engaging spring, and the engaging spring is installed on the mounting frame. When the limiting rod is placed in the engaging notch, the mounting frame is fixed (locked) on the frame. When the clamping plate is pressed, the clamping plate slides along the screw in the sliding groove, so that the limit rod is separated from the clamping notch, and the mounting frame can move on the rack (such as being lifted along the hinge), that is, it is in a non-fixed state. After the force of pressing the clamping plate disappears, under the action of the clamping spring (such as a tension spring or a compression spring), the clamping plate is reset along the screw in the sliding groove, the limit rod is located in the clamping notch, and the mounting frame is fixed (locked) on the rack.

[0014] In order to achieve close contact between the secondary conveyor roller and the main conveyor roller, one end of the secondary conveyor roller is installed on the head end of the left bracket, and the other end is installed on the head end of the right bracket. The middle part of the left bracket and the right bracket (the middle part does not need to be in the complete center position, of course, the center position is also acceptable) is rotatably installed on the mounting frame, and the ends of the left bracket and the right bracket are connected to the mounting frame through bracket springs. When the mounting frame moves downward, the secondary conveyor roller contacts the main conveyor roller, and the left bracket and the right bracket rotate along the middle part. Under the action of the bracket spring, the ends of the left bracket and the right bracket keep close contact with the main conveyor roller with the middle part of the left bracket and the right bracket as the center fulcrum. At the same time, the force between the secondary conveyor roller and the main conveyor roller can be adjusted.

[0015] In order to facilitate the opening of the plastic bag, a blowing device is provided on the mounting frame above the conveying roller, and the airflow released by the blowing device blows toward the bag opening of the plastic bag to be sealed. Preferably, the blowing device is a cross-flow fan, and a wind guide plate is provided in front of the cross-flow fan, and the wind guide plate guides the airflow of the cross-flow fan to the bag opening of the plastic bag to be sealed. The blowing device enlarges the opening (bag opening) to facilitate the placement of packaged items.

[0016] During heat sealing, in order to make the sealing neat and reduce or avoid the generation of wrinkles, a symmetrically arranged opening device is provided on the frame below the main conveying roller. Preferably, the opening device comprises an opening frame, on which a main pulley and a slave pulley are installed, a belt is connected between the main pulley and the slave pulley, the main pulley is driven by an opening motor, and an L-shaped support rod is installed on the slave pulley. In order to adjust the position of the symmetrically arranged opening device according to the size of the plastic bag, an opening plate is installed on the frame, on which a movable groove is provided, and the opening device is installed in the movable groove by screws.

[0017] In order to label the plastic bags before packaging and facilitate subsequent identification, a labeling device is installed on the mounting frame. As a method, the labeling device is movably installed on the mounting frame; the labeling device includes a main label conveying roller, and the mounting frame has a secondary label conveying roller. The main label conveying roller and the secondary label conveying roller are located above the main conveying roller, and the main label conveying roller and the secondary label conveying roller are used to convey labels. This structural method maximizes the utilization of space layout. The labeling device is lifted from the mounting frame, and the label paper on the label paper roll is directly placed on the main label conveying roller. Then the labeling device is put down. At this time, the label paper is between the main label conveying roller and the secondary label conveying roller. There is no need to pass the label paper between the main label conveying roller and the secondary label conveying roller, and there is no need for a complex structure to separate the main label conveying roller and the secondary label conveying roller before threading the label.

[0018] Specifically, the labeling device is movably connected to the mounting frame via a plurality of connecting rods. Furthermore, an unfolding torsion spring is provided between the connecting rod and the mounting frame, and the unfolding torsion spring enables the labeling device to move along the connecting rod. A locking device is provided between the labeling device and the mounting frame, and the locking device locks the labeling device on the mounting frame. In the unlocked state, the labeling device can move on the mounting frame via a plurality of connecting rods, and at this time, the label paper can be placed between the main label conveying roller and the secondary label conveying roller; in the locked state, the labeling device is fixed on the mounting frame and is in the labeling state.

[0019] Preferably, the locking device comprises a rotating rod, which is rotatably mounted on the labeling device, and the rear end of the rotating rod has a locking groove, and the mounting frame is provided with a locking rod, which is located in the locking groove, and when the rotating rod rotates, the locking rod is disengaged from the locking groove; the rotating rod is provided with a rotation return spring, one end of which is fixed on the rotating rod, and the other end of which is fixed on the labeling device. In order to facilitate the locking rod to enter the locking groove when the rotating rod moves downward, the end face of the rear end of the rotating rod is inclined. When the locking rod is located in the locking groove, the rotating rod cannot move upward, and the labeling device and the mounting frame are locked. When the rotating rod rotates, the locking rod is disengaged from the locking groove and is located on the surface of the rotating rod. The rotating rod has no blocking force, and the labeling device and the mounting frame can be disengaged (such as moving along the connecting rod). Under the action of the rotation return spring, the rotating rod rotates to restore the original state, the labeling device moves downward, the rotating rod moves downward, and the locking rod enters the locking groove along the surface of the rotating rod to achieve locking again. Specifically, the locking rod can be one end of the spring.

[0020] The packaging object of the packaging machine of the present invention is a single-sided open continuous roll plastic bag, which includes a plurality of continuously rolled plastic bags, each of which has a bag opening at the front end and a bag bottom edge at the rear end, and the bag opening of the previous plastic bag is connected to the bag bottom edge of the next plastic bag. Specifically, the back side of the previous plastic bag is connected to the back side of the next plastic bag through a cut (such as a tear line formed by a pinhole).

[0021] The label paper is also arranged in rolls, and the labels arranged at intervals are adhered to the label backing paper.

[0022] The packaging machine of the present invention has high space utilization rate and small volume, and is suitable for different, especially smaller packaging environments; it is convenient for placing materials and threading bags, and improves packaging efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] Figure 1 It is a stereogram of the present invention.

[0025] Figure 2 This is a three-dimensional diagram of the rack.

[0026] Figure 3 A schematic diagram of the rack structure.

[0027] Figure 4 This is the left side view of the rack.

[0028] Figure 5 A perspective view of the mounting bracket.

[0029] Figure 6 Schematic diagram of the mounting bracket clamping plate.

[0030] Figure 7 Schematic diagram of the rack heating strip.

[0031] Figure 8 This is a schematic diagram of the rack push rod.

[0032] Fig. 9 This is a schematic diagram of the left guide rod.

[0033] Fig.10 This is a schematic diagram of the support device.

[0034] Fig.11 Schematic diagram of the support device.

[0035] Fig.12 Schematic diagram of the upper part of the mounting frame.

[0036] Fig.13 This is a three-dimensional diagram of a labeling device.

[0037] Fig.14 This is the rear view of the labeling device (rotating rod).

[0038] Fig.15 Schematic diagram of the end of the rotating rod. DETAILED DESCRIPTION

[0039] like Figure 1-15 As shown, the roll plastic bag packaging machine includes a frame 1, in which a roll plastic bag placing drive mechanism is arranged, and the roll plastic bag placing drive mechanism is used to place the roll plastic bag and drive the roll plastic bag to rotate and unwind. As a specific embodiment, Figure 2 As shown, the continuous roll plastic bag placement drive mechanism includes a left track plate and a right track plate 3, which are respectively installed on the left and right sides of the frame, and the left track plate and the right track plate 3 are provided with an arc track groove 4; a placement shaft 5 is arranged in the arc track groove 4 of the left and right track plates 3, that is, one end of the placement shaft 5 is placed in the arc track groove 4 of the left track plate, and the other end of the placement shaft 5 is placed in the arc track groove 4 of the right track plate 3; a continuous roll driving shaft 6 is arranged in the frame 1, and the continuous roll driving shaft 6 is driven to rotate by a continuous roll power device, and the continuous roll driving shaft 6 is parallel to the placement shaft 5, and the continuous roll driving shaft 6 drives the continuous roll plastic bag on the placement shaft 5 to rotate and unwind along the placement shaft 5. When the rolled plastic bag on the placing shaft 5 is continuously unwound and its thickness is continuously reduced, since the placing shaft 5 is placed in the arc track groove 4, the placing shaft 5 continuously approaches the rolling drive shaft 6 along the arc track groove 4, so that the rolled plastic bag is always in contact with the rolling drive shaft 6. The rolling drive shaft 6 rotates, which can always drive the rolled plastic bag to rotate and unwind along the placing shaft 5.

[0040] Above the roll plastic bag placement drive mechanism, a main conveying roller 8 (such as Figure 7 As shown), the main conveying roller 8 is driven by the main conveying roller power device. The main conveying roller power device is preferably a motor, but the main conveying roller power device is not limited to a motor, and any component in the prior art that can achieve driving can be used. Figure 3 As shown, a continuous roll driving wheel 11 is provided at the end of the continuous roll driving shaft 6, and a main conveying roller driving wheel 10 is provided at the end of the main conveying roller 8. The continuous roll driving wheel 11, the main conveying roller driving wheel 10 and the motor driving wheel 12 are connected together through a driving belt 13. The motor drives the motor driving wheel 12 to drive the continuous roll driving wheel 11 and the main conveying roller driving wheel 10.

[0041] like Figure 1 As shown, the frame 1 is provided with a mounting frame 2 above, and the mounting frame 2 is movably connected to the frame 1. Preferably, one side of the mounting frame 2 is connected by a hinge 7 (such as Figure 7 As shown in FIG. 1 , the mounting frame 2 is movably connected to the rack 1. At this time, in order to fix (lock) the mounting frame 2 on the rack 1, a fixing piece is provided on the other side of the mounting frame 2, and the fixing piece fixes the mounting frame 2 to the rack 1. Under normal conditions, the fixing piece fixes the mounting frame 2 to the rack 1. When necessary, the fixing piece can make the mounting frame 2 and the rack 1 in an unfixed state, so that the mounting frame 2 can be lifted. Specifically, as shown in FIG. Figure 6 As shown, the fixing member includes at least one engaging plate 29. For example, if there are two engaging plates 29, the two engaging plates 29 are respectively arranged on the left and right sides of the mounting frame 2. The engaging plate 29 has two sliding grooves 31, and the sliding grooves 31 have screws 32, and the screws 32 are installed on the mounting frame 2; the end of the engaging plate 29 has an engaging notch 30, and the engaging notch 30 has a limiting rod 69 (such as Figure 3 As shown in the figure, the limit rod 69 is installed on the frame 1; a locking spring is installed at the end of the locking plate 29, and the locking spring can be a tension spring or a compression spring, and the locking spring is installed on the mounting frame 2. When the limit rod 69 is placed in the locking notch 30, the mounting frame 2 is fixed (locked) on the frame 1. When the locking plate 29 is pressed, the locking plate 29 slides along the screw 32 in the sliding groove 31, so that the limit rod 69 is disengaged from the locking notch 30, and the mounting frame 2 can move on the frame 1 (such as being lifted along the hinge 9), that is, it is in a non-fixed state. After the force of pressing the locking plate 29 disappears, under the action of the locking spring (such as a tension spring or a compression spring), the locking plate 29 is reset along the screw 32 in the sliding groove 31, the limit rod 69 is located in the locking notch 30, and the mounting frame 2 is fixed (locked) on the frame 1.

[0042] The mounting frame 2 is provided with a secondary conveying roller 15 corresponding to the main conveying roller 8. The main conveying roller 8 and the secondary conveying roller 15 cooperate to convey the plastic bags. Figure 5 As shown, one end of the secondary conveying roller 15 is mounted on the head end of the left bracket 16, and the other end is mounted on the head end of the right bracket 19. The middle part of the left bracket 16 and the right bracket 19 (the middle part does not need to be in the complete center position, of course, the center position is also acceptable) is rotatably mounted on the mounting frame 2 through the rotating shafts 17 and 20. The ends of the left bracket 16 and the right bracket 19 are connected to the mounting frame 2 through the bracket springs 18 and 21, respectively, so that the left bracket 16 and the right bracket 19 form a seesaw structure with the middle part as the fulcrum (rotating shafts 17 and 20). When the mounting frame 2 moves downward, the secondary conveying roller 15 contacts the main conveying roller 8, and the left bracket 16 and the right bracket 19 rotate along the middle part. Under the action of the bracket springs 18 and 21 (which are stretched and deformed), the ends of the left bracket 16 and the right bracket 19 are kept in close contact with the main conveying roller 8 with the middle part of the left bracket 16 and the right bracket 19 as the center fulcrum.

[0043] Below the main conveying roller 8, a heating element for sealing the plastic bag is arranged on the frame 1. Specifically, the heating element is preferably an electric heating wire, but the heating element is not limited to the electric heating wire. Elements in the prior art such as electric heating blocks can be used as long as they can achieve heat sealing.

[0044] like Figure 8 As shown, the heating element has a push rod 35 corresponding to it, and the plastic bag passes between the push rod 35 and the heating element, and the push rod 35 pushes the plastic bag to the heating element for heating and sealing. At the same time, in order to make the plastic bag close to the electric heating element and improve the heat sealing efficiency, the push rod 35 is installed with a soft rubber strip 36 (high temperature resistant), and the soft rubber strip 36 also has a certain buffering effect.

[0045] In order to play a buffering role, such as Figure 7 As shown, the heating element is installed on the heating strip 33, and the heating strip 33 is installed on the frame 1 through a spring element, such as a spring 34, so that the heating element and the push rod are always in contact, which is conducive to sealing. For example, the heating strip 33 is movably installed on the frame 1 through a screw rod, and a spring 34 is sleeved on the screw rod. The spring 34 supports the heating strip 33 and can make the heating strip 33 float. This structure also has an important function: when the main conveying roller 8 and the secondary conveying roller 15 reverse to separate the plastic bags, if the connection between the single plastic bag and the continuous plastic bag is firm, because it is installed through the spring element and has a certain buffer distance, the motor driving the main conveying roller 8 will not be locked and burned, and the single plastic bag can be separated smoothly when rotating at the buffer distance.

[0046] like Figure 8As shown, the push rod 35 is installed on the left guide rod 37 and the right guide rod 42. The left guide rod 37 and the right guide rod 42 are arc-shaped. The left side of the frame 1 has a left walking channel for the left guide rod 37 to walk, and the right side of the frame 1 has a right walking channel for the right guide rod 42 to walk. The left guide rod 37 and the right guide rod 42 are driven by a guide rod power device.

[0047] Specifically, on the left side of the frame 1, the left walking channel includes 4 (not limited to 4) left guide wheels 38, 39, 40, 41 distributed up and down, at least two left guide wheels 38, 39 are distributed on the top, at least two left guide wheels 40, 41 are distributed on the bottom, and the left guide rod 37 is located between the upper left guide wheels 38, 39 and the lower left guide wheels 40, 41. Similarly, on the right side of the frame 1, the right walking channel includes right guide wheels distributed up and down, at least two right guide wheels are distributed on the top, at least two right guide wheels are distributed on the bottom, and the right guide rod 42 is located between the upper right guide wheel and the lower right guide wheel. The left guide rod 37 and the right guide rod 42 respectively travel in the left and right walking channels formed by the left and right guide wheels, saving the layout space of the components. At the same time, the left guide rod 37 and the right guide rod 42 are arc-shaped. When the left guide rod 37 and the right guide rod 42 are located in the body 1, the space utilization rate is improved; since the left guide rod 37 and the right guide rod 42 are arc-shaped, when they are extended, the position of the push rod 35 is lowered, reducing interference with the packaged items.

[0048] Furthermore, in order to limit and guide the movement of the left guide rod 37 and the right guide rod 42, as shown in FIG. Fig. 9 As shown, the wheel surface of the left guide wheel 38, 39, 40, 41 has a left running groove 43, and the upper surface and lower surface of the left guide rod 37 both have a left protrusion 44, and the left protrusion 44 is located in the left running grooves 43, 45. Similarly, the wheel surface of the right guide wheel has a right running groove, and the upper surface and lower surface of the right guide rod both have a right protrusion, and the right protrusion is located in the right running groove.

[0049] In order to realize the movement of the push rod 35, the guide rod power device is a guide rod motor (arranged inside the frame 1), such as Fig. 9As shown, the left guide rod 37 and the right guide rod 42 are both provided with a driving tooth 46, and the driving teeth 46 of the left guide rod 37 and the right guide rod 42 are respectively meshed with the left guide rod gear and the right guide rod gear, and the guide rod motor drives the left guide rod gear and the right guide rod gear to rotate, and the left guide rod gear and the right guide rod gear drive the left guide rod 37 and the right guide rod 42 to extend and retract through the driving tooth, so as to drive the push rod to move. Specifically, in order to realize synchronous drive, the left guide rod gear and the right guide rod gear are connected together through a synchronous shaft, and the left guide rod gear or the right guide rod gear is driven by a motor, thereby realizing synchronous drive. For the rational use of space, the left guide rod gear and the right guide rod gear are each connected to a driving gear 14, and the two driving gears 14 are connected together through a synchronous shaft, and one or two driving gears 14 are driven by a motor, thereby realizing synchronous drive.

[0050] To facilitate the opening of the plastic bag, Figure 5 As shown, an air blowing device is provided on the mounting frame 2 above the conveying roller 15, and the airflow released by the air blowing device blows toward the bag opening of the plastic bag to be sealed. As an embodiment, the air blowing device is a cross flow fan 27, and a wind guide plate 28 is provided in front of the cross flow fan 27, and the wind guide plate 28 guides the airflow of the cross flow fan 27 to the bag opening of the plastic bag to be sealed. The air blowing device enlarges the opening (bag opening) to facilitate the placement of packaged items.

[0051] In order to seal neatly and reduce or avoid wrinkles during heat sealing, Fig.10 As shown, below the main conveying roller 8, the frame 1 has a symmetrically arranged opening device 47. As an embodiment, Fig.11 As shown, the opening device 47 includes an opening frame 50, on which a main pulley 51 and a secondary pulley 52 are mounted, a belt 53 is connected between the main pulley 51 and the secondary pulley 52, the main pulley 52 is driven by an opening motor 54, and an L-shaped support rod 56 is mounted on the secondary pulley 52. ​​In order to adjust the position of the symmetrically arranged opening device 47 according to the size of the plastic bag, as shown in FIG. Fig.10 , 11 As shown, a support plate 48 is installed on the frame 1, and a moving groove 49 is provided on the support plate 48. The support device 47 is installed in the moving groove 49 by means of screws 55. The screws 55 are loosened during movement and tightened during operation.

[0052] In order to label plastic bags before packaging, it is convenient for subsequent identification and other operations, such as Figure 1 , 13 As shown, the mounting frame 2 is provided with a labeling device 57. As an embodiment, the labeling device 57 is a device in the prior art that relies on a label main conveying roller 60 and a label slave conveying roller 62 (such as Fig.12The labeling device 57 is movably mounted on the mounting frame 2. The labeling device 57 includes a main label conveying roller 60, and the mounting frame 2 has a secondary label conveying roller 62 (as shown in FIG. Fig.12 As shown), the main label conveying roller 60 and the secondary label conveying roller 62 are located above the main conveying roller 8, and the main label conveying roller 60 and the secondary label conveying roller 62 are used to convey labels. This structural mode maximizes the utilization of space layout. The labeling device 57 is lifted from the mounting frame 2, and the label paper on the label paper roll is directly placed on the main label conveying roller 60, and then the labeling device 57 is put down. At this time, the label paper is between the main label conveying roller 60 and the secondary label conveying roller 62. There is no need to pass the label paper between the main label conveying roller 60 and the secondary label conveying roller 62, and there is no need for a complex structure to separate the main label conveying roller 60 from the secondary label conveying roller 62 before threading the label. As an embodiment, the labeling device 57 is movably connected to the mounting frame 2 through four connecting rods 22, 23, 24, and 25, and the labeling device 57 can move on the mounting frame 2 along the connecting rods 22, 23, 24, and 25. Furthermore, an expansion torsion spring 26 is provided between the connecting rods 22, 23, 24, 25 and the mounting frame 2. Under the action of the elastic force of the expansion torsion spring 26, the connecting rods 22, 23, 24, 25 are driven to move, and the labeling device 57 moves with the connecting rods 22, 23, 24, 25.

[0053] Specifically, the labeling device 57 includes a label paper box 58 and a reel 59. The label paper box 58 and the reel 59 are mounted on a mounting plate. The main label conveying roller 60 and the reel 59 can be driven by a motor through a belt and a driving wheel. One end of the four connecting rods 22, 23, 24, and 25 is mounted on the bottom of the label paper box 58, and the other end is mounted on the mounting frame 2. The main label conveying roller 60 (the label slave conveying roller 62 is mounted on the mounting frame 2), the guide shaft 70, and the peeling rod 61 are also mounted on the mounting plate. The peeling rod 61 has a semi-cylindrical structure. The continuous roll of label paper is placed in the label paper box 58. The label paper enters between the main label conveying roller 60 and the slave label conveying roller 62 through the guide shaft 70, and is unwound under the drive of the main label conveying roller 60 and the slave label conveying roller 62. The label paper conveyed by the main label conveying roller 60 and the slave label conveying roller 62 passes through the semi-cylindrical structure of the peeling rod 61. After the label paper passes through the semi-cylindrical structure, it is folded at a large angle (i.e., changes direction) and is reeled up by the reel 59. At this time, the base paper of the label paper is collected by the reel 59, and the label on the base paper is adhered to the base paper. Since the conveying direction of the label paper is folded at a large angle after passing through the semi-cylindrical structure, the adhesion between the label and the base paper becomes smaller, and the label detaches from the base paper, falls and sticks to the conveyed plastic bag.

[0054] A locking device is provided between the labeling device 57 and the mounting frame 2, and the locking device locks the labeling device 57 on the mounting frame 2. In the unlocked state, the labeling device 57 can move on the mounting frame 2 through a plurality of connecting rods, and at this time, the label paper 57 can be placed between the main label conveying roller 60 and the secondary label conveying roller 62; in the locked state, the labeling device 57 is fixed on the mounting frame 2 and is in the labeling state.

[0055] As an implementation method, Fig.14 , 15 As shown, the locking device includes a rotating rod 63, which is rotatably mounted on the labeling device 57, and a locking groove 65 is provided at the rear end of the rotating rod 63. The mounting frame 2 is provided with a locking rod, and the locking rod 66 is located in the locking groove 65. When the rotating rod 63 rotates, the locking rod 63 is disengaged from the locking groove 65; a rotation return spring 64 is provided on the rotating rod 63, one end of the rotation return spring 64 is fixed on the rotating rod 63, and the other end of the rotation return spring 64 is fixed on the labeling device 57. In order to facilitate the locking rod 66 to enter the locking groove 65 when the rotating rod 63 moves downward, the end surface of the rear end of the rotating rod 63 is inclined. When the locking rod 66 is located in the locking groove 65, the rotating rod 63 cannot move upward, and the labeling device 57 and the mounting frame 2 are locked. When the rotating rod 63 rotates, the locking rod 66 disengages from the locking groove 65 and is located on the surface of the rotating rod 63. The rotating rod 63 has no blocking force, so the labeling device 57 can be disengaged from the mounting bracket 2 (such as moving along the connecting rod). Under the action of the rotation return spring 64, the rotating rod 63 rotates to restore the original state, the labeling device 57 moves downward, the rotating rod 63 moves downward, and the locking rod 66 enters the locking groove 65 along the surface of the rotating rod 63 to achieve locking again. Specifically, the locking rod 66 can be one end of the spring 67. When the rotating rod 63 moves downward, in order to facilitate the locking rod 66 to enter the locking groove 65, a blocking piece 68 is provided on the side of the locking rod 66, and the blocking piece 68 has a notch, and the locking rod 66 is limited in the notch to move.

[0056] During operation, the continuous roll plastic bag is placed on the driving mechanism, and the continuous roll plastic bag is driven to rotate and unwind at the same time. Before operation, the mounting frame 2 is lifted from the frame 1, and the plastic bag is directly placed on the main conveying roller 8, and then the mounting frame 2 is put down. At this time, the plastic bag is between the secondary conveying roller 15 and the main conveying roller 8, and there is no need to pass the plastic bag through the secondary conveying roller 15 and the main conveying roller 8, and there is no need for a complex structure to separate the secondary conveying roller 15 from the main conveying roller 8 before performing the bag-threading work. The main conveying roller 8 and the secondary conveying roller 15 rotate, and the plastic bag is transported between the heating element and the push rod 35, and the items to be packaged are placed in the plastic bag with a single-sided opening. The left guide rod 37 and the right guide rod 42 move along the left walking channel and the right walking channel respectively, and the left guide rod 37 and the right guide rod 42 drive the push rod 35 to move toward the heating element, push the transported plastic bag to the heating element, and the heating element works to achieve heat sealing of the plastic bag. At this time, the plastic bag is clamped between the push rod 35 and the heating element, and the main conveying roller 8 and the slave conveying roller 15 are reversed to separate the single sealed plastic bag from the rolled plastic bag (separated along the tearing line), completing a packaging process.

[0057] The above embodiments do not limit the present invention in any way, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A continuous plastic bag packaging machine, comprising a frame, characterized in that: A roll plastic bag placement drive mechanism is provided in the frame, and the roll plastic bag placement drive mechanism is used to place the roll plastic bag and drive the roll plastic bag to rotate and unwind; Above the roll plastic bag placement drive mechanism, a main conveying roller is arranged on the upper part of the frame, and the main conveying roller is driven by a main conveying roller power device; A mounting frame is provided above the frame, the mounting frame is movably connected to the frame, and a slave conveying roller corresponding to the main conveying roller is installed on the mounting frame; Below the main conveying roller, a heating element for sealing the plastic bag is arranged on the frame; The heating element has a push rod corresponding to it, and the plastic bag passes between the push rod and the heating element, and the push rod pushes the plastic bag toward the heating element for heating and sealing; The push rod is installed on the left guide rod and the right guide rod, the left guide rod and the right guide rod are arc-shaped, the left side of the frame has a left walking channel for the left guide rod to walk, and the right side of the frame has a right walking channel for the right guide rod to walk, and the left guide rod and the right guide rod are driven by a guide rod power device; The guide rod power device is a guide rod motor. The left guide rod and the right guide rod are both provided with driving teeth. The driving teeth of the left guide rod and the right guide rod are respectively meshed with the left guide rod gear and the right guide rod gear. The guide rod motor drives the left guide rod gear and the right guide rod gear to rotate.

2. The plastic bag packaging machine on a roll according to claim 1, characterized in that: The continuous roll plastic bag placement drive mechanism includes a left track plate and a right track plate, which are respectively installed on the left and right sides of the frame, and both the left track plate and the right track plate have an arc track groove; a placement shaft is arranged in the arc track grooves of the left track plate and the right track plate; a continuous roll driving shaft is arranged in the frame, and the continuous roll driving shaft is driven to rotate by a continuous roll power device, and the continuous roll driving shaft is parallel to the placement shaft, and the continuous roll driving shaft drives the continuous roll plastic bag on the placement shaft to rotate and unwind along the placement shaft.

3. The plastic bag packaging machine on a roll according to claim 1, characterized in that: The main conveying roller power device is a motor.

4. The plastic bag packaging machine on a roll according to claim 1, characterized in that: The heating element is mounted on a heating strip, and the heating strip is mounted on a frame via a spring element.

5. The plastic bag packaging machine on a roll according to claim 1, characterized in that: The heating element is an electric heating wire.

6. The plastic bag packaging machine on a roll according to claim 1, characterized in that: The push rod is equipped with a soft rubber strip.

7. The plastic bag packaging machine on a roll according to claim 1, characterized in that: The left walking channel includes left guide wheels distributed up and down, with at least two left guide wheels distributed on the top and at least two left guide wheels distributed on the bottom, and the left guide rod is located between the upper left guide wheel and the lower left guide wheel; the right walking channel includes right guide wheels distributed up and down, with at least two right guide wheels distributed on the top and at least two right guide wheels distributed on the bottom, and the right guide rod is located between the upper right guide wheel and the lower right guide wheel.

8. The plastic bag packaging machine on a roll according to claim 7, characterized in that: The wheel surface of the left guide wheel has a left walking groove, and the upper surface and the lower surface of the left guide rod both have a left protrusion, and the left protrusion is located in the left walking groove; the wheel surface of the right guide wheel has a right walking groove, and the upper surface and the lower surface of the right guide rod both have a right protrusion, and the right protrusion is located in the right walking groove.

9. The plastic bag packaging machine on a roll according to claim 1, characterized in that: One side of the mounting frame is movably connected to the frame via a hinge.

10. The plastic bag packaging machine on a roll according to claim 9, characterized in that: A fixing piece is arranged on the other side of the mounting frame, and the fixing piece fixes the mounting frame to the frame.

Images