Automatic bag opening mechanism of barrel film packaging machine and barrel film packaging machine thereof

Abstract

The utility model relates to an automatic bag opening mechanism of a barrel film packaging machine and the barrel film packaging machine, the automatic bag opening mechanism comprises a bag opening assembly arranged on a machine base, and the bag opening assembly comprises bag opening air cylinders arranged oppositely and bag opening suction cups linked with piston rods of the bag opening air cylinders; the bag opening device further comprises sliding seats arranged on the machine base in a sliding mode, and the bag opening air cylinders are arranged on the corresponding sliding seats respectively. The machine base is further provided with a driving air cylinder used for driving the sliding bases to synchronously slide in a reciprocating mode in the direction close to or away from each other. A lifting air cylinder is arranged on the sliding seat, a translation air cylinder is arranged on a piston rod of the lifting air cylinder, a bag pressing seat used for being mutually pressed with the inner side wall of a packaging bag is arranged on a piston rod of the translation air cylinder, the lifting air cylinder is used for driving the bag pressing seat to ascend and descend, and the translation air cylinder is used for driving the bag pressing seat to translate. The packaging bag opening device has the effect of assisting in opening the packaging bag so as to ensure that the packaging bag is kept in a stable bag opening state.

Description

Technical Field

[0001] The present application relates to the technical field of cylindrical film packaging machines, and in particular, to an automatic bag-opening mechanism for a cylindrical film packaging machine and the cylindrical film packaging machine. Background Art

[0002] At present, compared with traditional bag-type packaging machines, the biggest feature of cylindrical film packaging machines is that they directly use cylindrical double-layer films and can automatically complete the slitting and bottom sealing of the films. There is no need to pre-form bags, which improves the packaging efficiency. In related technologies, the structure of a cylindrical film packaging machine mainly includes a bag supply mechanism, a bag conveying mechanism for conveying the packaging bags on the bag supply mechanism to the product loading station, an automatic bag-opening mechanism for opening the bag mouths of the packaging bags at the product loading station, a product loading mechanism for conveying products into the packaging bags, and a sealing mechanism for sealing the packaging bags.

[0003] For the above-mentioned cylindrical film packaging machine, its automatic bag-opening mechanism includes cylinders arranged oppositely. A bag-opening suction cup is arranged on the piston rod of the cylinder, and a trachea is connected to the bag-opening suction cup. When the two bag-opening suction cups are respectively in contact with the outer walls of the packaging bag that are away from each other under the drive of their respective cylinders, a negative pressure is formed inside the bag-opening suction cup through the trachea. At this time, the packaging bag will be adsorbed on the bag-opening suction cup; then, the two bag-opening suction cups are separated from each other through the cylinder, and at this time, the bag mouth of the packaging bag can be opened.

[0004] During the product loading process, as the weight of the product in the packaging bag continuously increases, due to the limited suction force of the bag-opening suction cup, once the overall weight of the packaging bag exceeds the suction force of the bag-opening suction cup, the packaging bag will fall off the bag-opening suction cup at this time. If the suction force of the bag-opening suction cup is increased, it is easy to cause the packaging bag to be damaged. This has an impact on the product loading work and it is difficult to ensure the stable bag opening of the packaging bag. Summary of the Utility Model

[0005] The present application provides an automatic bag-opening mechanism for a cylindrical film packaging machine and the cylindrical film packaging machine, which has the effect of being able to assist in opening the packaging bag to ensure that the packaging bag maintains a stable bag-opening state.

[0006] The automatic bag-opening mechanism for a cylindrical film packaging machine provided by the present application adopts the following technical solution:

[0007] An automatic bag opening mechanism for a tubular film packaging machine, comprising a bag opening assembly arranged on a machine base, the bag opening assembly including bag opening cylinders arranged oppositely, and bag opening suction cups linked to the piston rods of the bag opening cylinders; further comprising a sliding seat slidably arranged on the machine base, the bag opening cylinders being respectively arranged on corresponding sliding seats; a driving cylinder is further arranged on the machine base for driving the sliding seats to reciprocally slide synchronously in directions approaching or separating from each other; a lifting cylinder is arranged on the sliding seat, a translation cylinder is arranged on the piston rod of the lifting cylinder, and a bag pressing seat for tightly pressing against the inner side wall of the packaging bag is arranged on the piston rod of the translation cylinder, the lifting cylinder being used for driving the bag pressing seat to lift, and the translation cylinder being used for driving the bag pressing seat to translate.

[0008] Preferably, slideways are arranged on the sliding seats, the lengths of the slideways extending along the telescopic directions of the piston rods of the bag opening cylinders; mounting frames are slidably arranged on the slideways, the bag opening suction cups being arranged on the mounting frames; the piston rods of the bag opening cylinders are fixedly connected to the respective opposite mounting frames; the bag pressing seat is mounted on the mounting frame.

[0009] Preferably, adjustment slots are arranged on the mounting frames, an adjustment seat is arranged on one side of the mounting frame, a fastening member facing the adjustment slots is arranged on the adjustment seat, the adjustment seat being slidably arranged on the outside of the adjustment slots along the length direction of the adjustment slots; the fastening member passes through the adjustment slots, and the fastening member is used for fixing the adjustment seat on the mounting frame; the bag opening suction cups are arranged on the adjustment seat.

[0010] Preferably, bag feeding seats arranged symmetrically are further included, bag feeding jaws located between the sliding seats are arranged on the bag feeding seats, the bag feeding jaws being used for clamping and fixing the packaging bag at the product loading station; the bag feeding seats are used for periodically driving the bag feeding jaws to reciprocally move in directions approaching or separating from each other.

[0011] Preferably, linear guide rails are arranged on the machine base, and one end of the bag feeding seat away from the bag feeding jaws is slidably arranged on the linear guide rails.

[0012] Preferably, a bidirectional lead screw rotatably arranged on the machine base is further included, the length direction of the bidirectional lead screw being consistent with the length direction of the linear guide rails; one ends of the bag feeding seats away from the bag feeding jaws are respectively threadedly connected to both sides of the bidirectional lead screw, and the bidirectional lead screw is used for synchronously driving the bag feeding seats on both sides to slide along the linear guide rails in directions approaching or separating from each other.

[0013] Preferably, heat sealing plates facing the product loading station are arranged on the outer side walls of the sliding seats, and the heat sealing plates located on both sides of the product loading station are arranged oppositely.

[0014] This application also provides a tubular film packaging machine equipped with the automatic bag opening mechanism of the above tubular film packaging machine.

[0015] In summary, the present application includes at least one of the following beneficial technical effects:

[0016] During the bag-opening process, by driving the bag-feeding jaws on both sides to move synchronously towards each other for a certain distance, it can effectively avoid the situation of the packaging bag being damaged or deformed due to uneven force during the bag-opening process, ensuring that the bag mouth of the packaging bag can be smoothly opened to the specified size;

[0017] During the bag-opening and subsequent feeding processes, the packaging bag is clamped and fixed by the bag-feeding jaws on both sides, thereby further improving the stability of the packaging bag;

[0018] By limiting the packaging bag with the bag-pressing seat, the stability during the bag-opening of the packaging bag can be greatly improved, ensuring the smooth progress of the bag-opening process, enhancing the bag-opening effect of the packaging bag, and ensuring that the packaging bag maintains a stable bag-opening state. Description of the Drawings

[0019] Figure 1 is the overall structural schematic diagram of the embodiment of the present application installed on the machine base;

[0020] Figure 2 is Figure 1 the structural schematic diagram highlighting the bag-opening assembly in;

[0021] Figure 3 is Figure 2 the enlarged structural schematic diagram of part A in;

[0022] Figure 4 is the partial structural schematic diagram highlighting the bag-opening assembly and the sliding seat;

[0023] Figure 5 is the partial structural schematic diagram highlighting the bag-feeding seat at the bottom of the machine base.

[0024] Description of the Reference Numerals: 1. Bag-opening assembly; 10. Bag-opening cylinder; 100. Guide rod; 11. Bag-opening suction cup; 2. Sliding seat; 20. Slideway; 21. Mounting frame; 22. Adjusting groove; 23. Adjusting seat; 24. Fastening piece; 25. Heat-sealing plate; 3. Driving cylinder; 4. Lifting cylinder; 5. Translating cylinder; 50. Bag-pressing seat; 6. Bag-feeding seat; 60. Bag-feeding jaw; 61. Linear guide rail; 7. Bi-directional lead screw. Detailed Description of the Embodiment

[0025] The following further describes the present application in detail with reference to the drawings.

[0026] The embodiment of the present application discloses an automatic bag-opening mechanism for a tubular film packaging machine.

[0027] Referring to Figure 1 , Figure 2, the automatic bag-opening mechanism of the tubular film packaging machine includes a bag-opening assembly 1. Two mutually parallel guide rods 100 are fixedly installed on the machine base. The length of the guide rods 100 extends in the horizontal direction, and the guide rods 100 are symmetrically arranged on the left and right sides of the machine base. Two sets of relatively arranged sliding seats 2 are installed between the guide rods 100 on both sides. The left and right ends of the sliding seats 2 are respectively slidably sleeved outside their respective opposite guide rods 100, and the sliding seats 2 slide along the length direction of the guide rods 100. Two sets of driving cylinders 3 respectively facing their respective sliding seats 2 are also fixedly installed on the machine base. The driving cylinders 3 are respectively located on the front and rear sides of the sliding seats 2, and the piston rods of the driving cylinders 3 are respectively fixedly connected to their respective opposite sliding seats 2. The driving cylinders 3 are used to synchronously drive the sliding seats 2 on both sides to reciprocally slide along the guide rods 100 in the direction of approaching or separating from each other.

[0028] As Figure 3 , Figure 4 shown, a product loading station is formed between the sliding seats 2 on both sides. Two chutes 20 symmetrically arranged on the left and right sides of the sliding seats 2 are fixedly installed on the sliding seats 2. The length direction of the chutes 20 is the same as the length direction of the guide rods 100. An installation frame 21 is arranged on the sliding seat 2. The bottom of the installation frame 21 slides and is limited on the two chutes 20 on both sides, and the installation frame 21 slides along the length direction of the two chutes 20.

[0029] As Figure 3 , Figure 4 shown, two adjusting slots 22 are penetrated on the side wall of the installation frame 21 facing the product loading station. The adjusting slots 22 are symmetrically arranged on the left and right sides of the installation frame 21, and the length of the adjusting slots 22 extends along the length direction of the sliding seat 2.

[0030] As Figure 3 , Figure 4 shown, an adjusting seat 23 is detachably installed on the side of the installation frame 21 facing the product loading station. A fastener 24 facing their respective adjusting slots 22 is arranged on the adjusting seat 23. The fastener 24 includes a bolt fixedly installed at one end on the adjusting seat 23 and a nut used to screw and fix on the bolt. The adjusting seat 23 is slidably arranged on the outside of the adjusting slot 22 along the length direction of the adjusting slot 22. The bolts are respectively penetrated in their respective opposite adjusting slots 22, and then the adjusting seat 23 is screwed and fixed on the outside of the installation frame 21 through the nut.

[0031] As Figure 3 , Figure 4As shown, the bag opening assembly 1 includes two sets of bag opening cylinders 10 respectively and fixedly installed on their respective sliding seats 2. The piston rods of the two sets of bag opening cylinders 10 are arranged oppositely, and the piston rods of the bag opening cylinders 10 extend and retract along the sliding directions of their respective opposite mounting frames 21. The piston rods of the bag opening cylinders 10 are fixedly connected to their respective opposite mounting frames 21, and the bag opening cylinders 10 are used to synchronously drive the two side mounting frames 21 to slide along the slideway 20 in the direction of approaching or separating from each other. The bag opening assembly 1 further includes a bag opening suction cup 11 detachably installed on the side of the adjusting seat 23 facing the product loading station. The bag opening cylinder 10 is used to drive the bag opening suction cup 11 to slide synchronously with the mounting frame 21. One end of the bag opening suction cup 11 is communicated with a trachea, and the outer side wall of the packaging bag is adsorbed and fixed through the bag opening suction cup 11.

[0032] As Figure 3 , Figure 4 shown, a lifting cylinder 4 with a vertically arranged piston rod is fixedly installed on the sliding seat 2. A translation cylinder 5 is fixedly installed on the piston rod of the lifting cylinder 4. The piston rod of the translation cylinder 5 faces the product loading station, and the piston rod of the translation cylinder 5 extends and retracts along the sliding direction of the mounting frame 21. A bag pressing seat 50 for pressing against the inner side wall of the packaging bag is arranged on the piston rod of the translation cylinder 5. The bag pressing seat 50 is erected above the mounting frame 21. The lifting cylinder 4 is used to drive the bag pressing seat 50 to lift and lower in the vertical direction, while the translation cylinder 5 is used to drive the bag pressing seat 50 to translate along the sliding direction of the mounting frame 21.

[0033] As Figure 3 , Figure 5 shown, a linear guide rail 61 located below the sliding seat 2 is also fixedly installed on the machine base. The length of the linear guide rail 61 extends along the length direction of the sliding seat 2. The left and right sides of the linear guide rail 61 are slidably provided with bag feeding seats 6. The two side bag feeding seats 6 are symmetrically arranged. One end of the bag feeding seat 6 away from the linear guide rail 61 extends towards the product loading station to the lower part of the product loading station. Bag feeding claws 60 located on the left and right sides of the product loading station are fixedly installed on the bag feeding seat 6. The two side bag feeding claws 60 are used to clamp and fix the packaging bag at the product loading station.

[0034] As Figure 3 , Figure 5 shown, a bidirectional lead screw 7 driven by a motor is also rotatably installed on the machine base. The left and right ends of the bidirectional lead screw 7 are provided with reverse external threads. The bidirectional lead screw 7 is located below the linear guide rail 61, and the length direction of the bidirectional lead screw 7 is the same as the length direction of the linear guide rail 61. One end of the bag feeding seat 6 away from the bag feeding claw 60 is respectively threadedly connected to the left and right sides of the bidirectional lead screw 7. The bidirectional lead screw 7 is periodically rotated forward or backward alternately under the drive of an external motor, so as to synchronously drive the two side bag feeding seats 6 to reciprocally slide along the linear guide rail 61 in the direction of approaching or separating from each other.

[0035] AsFigure 3 , Figure 5 As shown in Figure 5 , a heat-sealing plate 25 facing the product loading station is fixedly arranged on the outer side wall of the sliding seat 2, and the heat-sealing plates 25 on both sides of the product loading station are arranged oppositely. After the electric heating element inside the heat-sealing plate 25 is powered on, it quickly heats up until the outer side wall of the heat-sealing plate 25 reaches an appropriate temperature. Finally, the bag mouths of the packaging bags are squeezed by the two heat-sealing plates 25, and the bag mouths of the packaging bags are softened by heat, and finally the bag mouths of the packaging bags are heat-sealed.

[0036] The embodiment of the present application also discloses a cylindrical film packaging machine, and the above automatic bag-opening mechanism is installed on the machine base.

[0037] The implementation principle is as follows: When the bag feeding grippers 60 on the left and right sides clamp and fix the packaging bag at the product loading station, the sliding seats 2 on the front and back sides will move synchronously in the direction of approaching each other under the drive of their respective driving cylinders 3. After the two sliding seats 2 move to the designated stations, the bag-opening cylinders 10 will push their respective bag-opening suction cups 11 to move synchronously in the direction of approaching the packaging bag until the two bag-opening suction cups 11 are respectively suction-joined and fixed to the outer side walls of the packaging bag facing away from each other. Subsequently, the two sliding seats 2 will move synchronously in the direction of separating from each other for a certain distance. At the same time, the bag feeding grippers 60 on both sides will also move synchronously in the direction of approaching each other for a certain distance under the drive of the bidirectional lead screw 7. As the two sliding seats 2 separate from each other, the bag mouth of the packaging bag will be gradually opened under the drive of the two bag-opening suction cups 11.

[0038] During the bag-opening process, by driving the bag feeding grippers 60 on both sides to move synchronously in the direction of approaching each other for a certain distance, it can effectively avoid the situation that the packaging bag is damaged or deformed due to uneven force during the bag-opening process, ensuring that the bag mouth of the packaging bag can be smoothly opened to the specified size. In addition, during the bag-opening and subsequent feeding processes, the packaging bag is clamped and fixed by the bag feeding grippers 60 on both sides, so as to further improve the stability of the packaging bag.

[0039] When the bag mouth of the packaging bag is smoothly opened under the drive of the bag feeding grippers 60 on both sides, the translation cylinders 5 will push their respective bag pressing seats 50 to move synchronously in the direction of approaching the bag mouth until the bag pressing seats 50 are located above the bag mouth. Subsequently, the lifting cylinders 4 will drive their respective bag pressing seats 50 to move down synchronously until the bag pressing seats 50 are inserted into the packaging bag from the bag mouth. Then the translation cylinders 5 will drive the bag pressing seats 50 to retreat and reset until the outer side wall of the packaging bag is pressed against the outer side wall of the respective opposite mounting frame 21.

[0040] Then the two sliding seats 2 will move synchronously in the direction of separating from each other again to the designated stations. At this time, the bag mouth of the packaging bag will be further enlarged. During this process, by limiting the packaging bag with the bag pressing seat 50, the stability of the packaging bag during bag-opening can be greatly improved, ensuring the smooth progress of the bag-opening process, improving the bag-opening effect of the packaging bag, and ensuring that the packaging bag maintains a stable bag-opening state.

[0041] After the packaging bag is loaded with products, the translation cylinder 5 will push the two side bag pressing seats 50 to move synchronously towards each other again. Then, the lifting cylinder 4 will push the two side bag pressing seats 50 to move up synchronously until the bag pressing seats 50 are removed from the packaging bag. Finally, the translation cylinder 5 will push the bag pressing seats 50 to move back and reset synchronously to prepare for the next round of bag opening.

[0042] Then, the two side bag feeding claws 60 will remove the suction force applied to the packaging bag. Subsequently, the two side bag feeding claws 60 will move back and reset synchronously towards the direction away from each other until the bag mouth of the packaging bag is straightened. Then, the two side sliding seats 2 will move synchronously towards each other until the heat sealing plate 25 is pushed to contact the outer wall of the packaging bag, and the bag mouth is heat-sealed through the heat sealing plate 25. After the heat sealing is completed, the two side sliding seats 2 will open synchronously. Finally, the two side bag feeding claws 60 will release the packaging bag, and at this time, the product after bagging can fall from the product loading station.

[0043] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An automatic bag-opening mechanism for a tubular film packaging machine, comprising a bag-opening assembly (1) arranged on a machine base, wherein the bag-opening assembly (1) includes bag-opening cylinders (10) arranged oppositely, and bag-opening suction cups (11) linked to the piston rods of the bag-opening cylinders (10); characterized in that: It further includes a sliding seat (2) slidably arranged on the machine base, and the bag-opening cylinders (10) are respectively arranged on the corresponding sliding seats (2); a driving cylinder (3) is also arranged on the machine base for driving the sliding seats (2) to reciprocally slide synchronously in the direction of approaching each other or moving away from each other; a lifting cylinder (4) is arranged on the sliding seat (2), a translation cylinder (5) is arranged on the piston rod of the lifting cylinder (4), and a bag-pressing seat (50) for pressing against the inner side wall of the packaging bag is arranged on the piston rod of the translation cylinder (5). The lifting cylinder (4) is used for driving the bag-pressing seat (50) to lift, and the translation cylinder (5) is used for driving the bag-pressing seat (50) to translate.

2. The automatic bag-opening mechanism of the tubular film packaging machine according to claim 1, characterized in that: A slideway (20) is arranged on the sliding seat (2), and the length of the slideway (20) extends along the telescopic direction of the piston rod of the bag-opening cylinder (10); a mounting bracket (21) is slidably arranged on the slideway (20), and the bag-opening suction cup (11) is arranged on the mounting bracket (21); the piston rod of the bag-opening cylinder (10) is fixedly connected to the corresponding mounting bracket (21); the bag-pressing seat (50) is mounted on the mounting bracket (21).

3. The automatic bag opening mechanism of the tubular film packaging machine according to claim 2, characterized in that: An adjustment groove (22) is arranged on the mounting bracket (21), an adjustment seat (23) is arranged on one side of the mounting bracket (21), a fastening member (24) facing the adjustment groove (22) is arranged on the adjustment seat (23), and the adjustment seat (23) is slidably arranged on the outside of the adjustment groove (22) along the length direction of the adjustment groove (22); the fastening member (24) penetrates through the adjustment groove (22), and the fastening member (24) is used for fixing the adjustment seat (23) on the mounting bracket (21); the bag-opening suction cup (11) is arranged on the adjustment seat (23).

4. The automatic bag opening mechanism of the tubular film packaging machine according to claim 1, characterized in that: It further includes symmetrically arranged bag-feeding seats (6), and bag-feeding claws (60) located between the sliding seats (2) are arranged on the bag-feeding seats (6). The bag-feeding claws (60) are used for clamping and fixing the packaging bag at the product loading station; the bag-feeding seats (6) are used for periodically driving the bag-feeding claws (60) to reciprocally move in the direction of approaching each other or moving away from each other.

5. The automatic bag opening mechanism of the tubular film packaging machine according to claim 4, characterized in that: It further includes a linear guide rail (61) arranged on the machine base, and one end of the bag-feeding seat (6) away from the bag-feeding claws (60) is slidably arranged on the linear guide rail (61).

6. The automatic bag-opening mechanism of the tubular film packaging machine according to claim 5, characterized in that: It further includes a bidirectional lead screw (7) rotatably arranged on the machine base, and the length direction of the bidirectional lead screw (7) is the same as the length direction of the linear guide rail (61); one end of the bag-feeding seat (6) away from the bag-feeding claws (60) is respectively threadedly connected to both sides of the bidirectional lead screw (7), and the bidirectional lead screw (7) is used for synchronously driving the two bag-feeding seats (6) to slide along the linear guide rail (61) in the direction of approaching each other or moving away from each other.

7. The automatic bag-opening mechanism of the tubular film packaging machine according to claim 1, characterized in that: A heat-sealing plate (25) facing the product loading station is arranged on the outer side wall of the sliding seat (2), and the heat-sealing plates (25) on both sides of the product loading station are arranged oppositely.

8. A cylindrical film packaging machine, characterized in that: An automatic bag-opening mechanism of the tubular film packaging machine according to any one of claims 1 to 7 above is installed.

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