CN112224526A

CN112224526A - Film bag opening mechanism and method

Info

Publication number: CN112224526A
Application number: CN202010986838.8A
Authority: CN
Inventors: 伍福庆; 袁银玲
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-09-18
Filing date: 2020-09-18
Publication date: 2021-01-15

Abstract

The invention relates to the field of film packaging, in particular to a film bag opening mechanism and method and a forming bag opening device. The mechanism comprises a bag opening frame, a bag opening driving component and a bag opening head; the bag opening machine frame is fixed on the workbench, the bag opening driving assembly is fixed on the bag opening machine frame, and the output end of the bag opening driving assembly is connected with the bag opening head; the bag opening head is respectively connected with the forming mechanism, the packaging box feeding device and the edge sealing device under the driving of the bag opening driving component; the bag opening driving assembly is used for driving the bag opening head to move to different stations; the bag opening head is used for opening the film bag; the mechanism avoids the wrinkles of different degrees when the membrane bag is opened by arranging the bag opening head, and improves the opening quality of the membrane bag.

Description

Film bag opening mechanism and method

Technical Field

The invention relates to the field of film packaging, in particular to a film bag opening mechanism and method and a forming bag opening device.

Background

The film packaging method is mainly a packaging method which wraps the product with a heat shrinkable film and then heats the product to shrink the film and wrap the product. For a film bag packaging process, it generally comprises: hot cutting and forming, pushing the box into a bag in place, hot cutting and sealing, hot cutting four corners, blanking and the like. And carry out film packaging to the packing carton not only can beautify the surface of packing carton, also play the effect of protection to the cell-phone at the producer to the transportation of distributor simultaneously, prevent to cause the damage of cell-phone in the process of transportation. Therefore, the film packaging is very important for the packaging box processing.

The Chinese intellectual property office discloses that publication number is CN208248549U, and the patent name is a tectorial membrane cornering machine, including lower rack, plastic module, fuselage module, secondary location module, hot cutting module, roll up membrane module, send membrane module, artifical material level of putting, material loading module and power air supply switch, plastic module, secondary location module, hot cutting module, roll up membrane module, send membrane module, artifical material level of putting, material loading module are all installed on the fuselage module, install the electric cabinet in the lower rack, and power air supply switch installs on the electric cabinet, and artifical material level of putting sets up on material loading module, and the product is put into from artifical material level of putting, and plastic module drives the product and advances and carry to hot cutting module, send membrane module and roll up the interlude that membrane module installed in plastic module and hot cutting module. The utility model discloses an automatic equipment to packing carton and other types of boxes of cell-phone tectorial membrane cornering machine, great improvement intensity of labour height, inefficiency, product packaging effect a series of problems such as not good.

The prior art has the following defects: 1. when the film bag is manufactured and the film is moved, the film is sucked by adopting the air suction device with a fixed length, and then the driving device drives the air suction device to move the film sucked by the air suction device to a corresponding station; the suction device sucks the film through suction force generated by vacuum, and the requirement on the attaching degree between the suction device and the film is high when the suction force is generated by the vacuum; when the flatness of a suction base plate in the suction device is poor or the surface of a film is not flat, a certain gap is generated between the suction device and the film to destroy the joint degree between the suction device and the film, and a part of suction force of the suction device to the film flows out along the gap, so that the phenomenon that the suction device cannot firmly suck the film is generated; meanwhile, the air suction device with the fixed length can only suck the film with the length longer than that of the air suction device; when the length of the film is shorter, the suction holes longer than the film in the suction device can also leak air because the suction holes are not attached to the film, so that the adaptability of the suction device is lower. 2. When the film bag is expanded, the forming device firstly makes the film into the film bag with the upper film and the lower film in contact; then an upper suction plate and a lower suction plate of the suction device are respectively contacted with the upper side and the lower side of the film bag, and the suction device drives the upper suction plate and the lower suction plate to respectively move upwards and downwards to separate the upper side and the lower side of the film bag contacted with the suction plates; the surfaces of the films have certain viscosity, and when the upper and lower films of the film bag are contacted, the upper and lower films are adhered due to the viscosity of the surfaces; the material of the film is soft and is easy to deform when being stressed, and when the upper and lower suction plates of the suction device drive the adhered upper and lower films to be separated through suction, the film can be irregularly deformed due to the suction and irregular adhesion force; therefore, the membrane bag part has folds with different degrees when the membrane bag is expanded, and the expanding quality of the membrane bag is influenced.

Disclosure of Invention

In view of the above problems, an object of the present invention is to: the film bag opening mechanism and the method avoid folds with different degrees when the film bag is opened by arranging the bag opening head, and improve the opening quality of the film bag. Another object of the invention is: the forming mechanism is arranged to prevent the air suction device from firmly sucking the film, so that the adaptability of the film in moving is improved; the bag opening mechanism is arranged to avoid folds of different degrees when the film bag is opened, and the opening quality of the film bag is improved.

In order to achieve the purpose, the invention adopts the following technical scheme:

a bag opening mechanism for a film bag comprises a bag opening frame, a bag opening driving assembly and a bag opening head; the bag opening machine frame is fixed on the workbench, the bag opening driving assembly is fixed on the bag opening machine frame, and the output end of the bag opening driving assembly is connected with the bag opening head; the bag opening head is respectively connected with the forming mechanism, the packaging box feeding device and the edge sealing device under the driving of the bag opening driving component; the bag opening driving assembly is used for driving the bag opening head to move to different stations; the bag opening head is used for opening the film bag; the bag opening head comprises a bag opening lower plate, a bag opening upper plate, a lower plate pressing block, a lower plate cylinder and an upper plate suction head; the bag opening lower plate is connected with the output end rack of the bag opening driving assembly, the bag opening upper plate is connected with the movable part of the output end of the bag opening driving assembly, and the distance between the bag opening lower plate and the inner side surface of the bag opening upper plate is matched with the height of the packaging box; the outer side surface of the lower plate of the bag opening and the outer side surface of the upper plate of the bag opening are respectively contacted with the upper surface of the film bag and the inner side of the lower surface of the film bag; the lower plate pressing blocks are in rotating fit with the output end rack of the bag opening driving assembly, and the rotating ends of the lower plate pressing blocks are connected with the output ends of the lower plate air cylinders; the upper plate suction head is fixed on the upper plate of the bag opening, and the output end of the upper plate suction head and the output end of the lower plate pressing block are respectively contacted with the outer sides of the upper surface and the lower surface of the film bag.

Preferably, the suction force between the suction head of the upper plate and the film is greater than the adhesive force between the upper plate of the bag opening and the film; the adhesive force between the lower plate pressing block and the thin film is larger than that between the lower plate of the support bag and the thin film. The upper plate of the supporting bag is of a hollow structure. The distance between the suction head of the upper plate and the upper plate of the bag opening is larger than the thickness of the film.

Preferably, the bag opening lower plate and the bag opening upper plate both comprise a support plate fixing part and a support plate winding part; the supporting plate fixing part of the bag supporting lower plate and the supporting plate fixing part of the bag supporting upper plate are respectively connected with the bag supporting lower plate and the bag supporting upper plate; the support plate winding part of the lower bag opening plate and the support plate winding part of the upper bag opening plate are both contacted with the film. The winding widths of the support plate winding part of the support bag lower plate and the support plate winding part of the support bag upper plate are larger than the width of the packing box.

Preferably, the bag opening driving assembly comprises a bag opening first driving element, a bag opening second driving element and a bag opening third driving element; the bag opening first driving element is fixed on the workbench, and the output end of the bag opening first driving element is connected with the bag opening second driving element; the output end of the bag opening second driving element is connected with a bag opening third driving element, and the output end of the bag opening third driving element is connected with a bag opening upper plate. The bag opening second driving element is driven by an air cylinder.

In addition, the invention also discloses a film bag opening method, which adopts the film bag opening mechanism and comprises the following steps:

1) the bag opening driving component acts to drive the bag opening head to move to a station connected with the forming mechanism;

2) the forming mechanism winds the film on the support plate winding parts of the bag opening lower plate and the bag opening upper plate and produces an opening film bag;

3) the lower plate cylinder acts to drive the lower plate pressing block to press the film at the lower plate of the bag opening, and the suction head of the upper plate firmly sucks the film at the upper plate of the bag opening;

4) the bag opening third driving element acts to drive the bag opening upper plate to move upwards to separate the upper surface and the lower surface of the film bag, and the packaging box feeding device feeds the packaging box into the separated film bag;

5) the lower plate cylinder acts to drive the lower plate pressing block to loosen the film at the position of the lower plate of the bag opening, the suction head of the upper plate loosens the film at the position of the upper plate of the bag opening, and the bag opening driving assembly drives the lower plate of the bag opening and the upper plate of the bag opening to move out of the inner side of the bag opening to complete the film bag opening process.

In addition, the invention also discloses a film bag forming and bag opening device, which comprises a forming mechanism and a bag opening mechanism; the bag opening mechanism adopts the film bag opening mechanism; the forming mechanism and the bag opening mechanism are fixed on the workbench, and the input end and the output end of the forming mechanism are respectively connected with the film feeding device and the input end of the bag opening mechanism; the output end of the bag opening mechanism is respectively connected with the discharge hole of the packaging box feeding device and the feed hole of the edge sealing device; the forming mechanism is used for forming the film; the bag opening mechanism is used for opening the film bag manufactured by the forming mechanism.

The film bag opening mechanism and the method adopting the technical scheme have the advantages that:

by arranging the bag opening head; after the bag opening head moves to a station connected with the forming mechanism, the forming mechanism winds the film on the winding parts of the support plates of the bag opening lower plate and the bag opening upper plate and forms an opening film bag; the lower plate cylinder acts to drive the lower plate pressing block to press the film at the lower plate of the bag opening, and the suction head of the upper plate firmly sucks the film at the upper plate of the bag opening; the bag opening third driving element acts to drive the bag opening upper plate to move upwards to separate the upper surface and the lower surface of the film bag, and the packaging box feeding device feeds the packaging box into the separated film bag; the lower plate cylinder acts to drive the lower plate pressing block to loosen the film at the position of the lower plate of the bag opening, the suction head of the upper plate loosens the film at the position of the upper plate of the bag opening, and the bag opening driving assembly drives the lower plate of the bag opening and the upper plate of the bag opening to move out of the inner side of the bag opening to complete the film bag opening process. When the film bag is formed, the upper surface and the lower surface of the film bag are respectively contacted with the bag opening upper plate and the bag opening lower plate and are separated by the bag opening upper plate and the bag opening lower plate, but the upper surface and the lower surface of the film bag are not contacted with each other, so that the mutual adhesion between the upper surface and the lower surface of the film bag is avoided; meanwhile, when the upper surface and the lower surface of the film bag are separated, the film bag is stretched by adopting the up-and-down relative motion of the bag stretching upper plate and the bag stretching lower plate on the inner side of the film bag; the separation process is from inside to outside, the upper surface and the lower surface of the film bag are not contacted with each other, and the upper surface and the lower surface of the film bag are not deformed due to larger bonding force generated by mutual contact; therefore, the condition that the films are irregularly deformed due to the fact that the films are simultaneously subjected to suction force and irregular bonding force when the upper and lower suction plates of the suction device drive the adhered upper and lower films to be separated through the suction force is avoided, and the opening quality of the film bag is improved.

The invention discloses a film bag forming and bag supporting device, which has the advantages that:

1. by arranging a forming mechanism; when films with different widths are molded, the position of the second tensioning element on the movable sliding table is adjusted to correspond to the width of the film; the bag pulling driving motor acts to drive the first tensioning element and the second tensioning element to move to a station connected with the film feeding device; the tensioning cylinder acts to drive the tensioning pressing block to rotate to the position which is in contact with the surface of the thin film so as to press the thin film tightly. When the film is moved, the film is tightly pressed on the surface of the tensioning base through the action of the tensioning pressing block, namely the film is fixedly moved in a clamping manner; when the film is moved in a clamping mode, the film is fixed through the pressing force between the tensioning pressing block and the tensioning base, and the pressing force can be generated only by contacting the tensioning pressing block and the tensioning base with the surface of the film; when the air leakage condition of the air suction device is caused by the fact that the surface of the film is not flat, the tensioning pressing block and the tensioning base can still provide enough pressing force when being in contact with the surface of the film, and the phenomenon that the air suction device is affected by the air leakage condition and cannot firmly suck the film is avoided. Meanwhile, the position adjustment of the second tensioning element on the moving sliding table can also enable the tensioning distance between the first tensioning element and the second tensioning element to be suitable for films with various widths, and the adaptability of the mechanism is improved.

2. By arranging the bag opening head; after the bag opening head moves to a station connected with the forming mechanism, the forming mechanism winds the film on the winding parts of the support plates of the bag opening lower plate and the bag opening upper plate and forms an opening film bag; the lower plate cylinder acts to drive the lower plate pressing block to press the film at the lower plate of the bag opening, and the suction head of the upper plate firmly sucks the film at the upper plate of the bag opening; the bag opening third driving element acts to drive the bag opening upper plate to move upwards to separate the upper surface and the lower surface of the film bag, and the packaging box feeding device feeds the packaging box into the separated film bag; the lower plate cylinder acts to drive the lower plate pressing block to loosen the film at the position of the lower plate of the bag opening, the suction head of the upper plate loosens the film at the position of the upper plate of the bag opening, and the bag opening driving assembly drives the lower plate of the bag opening and the upper plate of the bag opening to move out of the inner side of the bag opening to complete the film bag opening process. When the film bag is formed, the upper surface and the lower surface of the film bag are respectively contacted with the bag opening upper plate and the bag opening lower plate and are separated by the bag opening upper plate and the bag opening lower plate, but the upper surface and the lower surface of the film bag are not contacted with each other, so that the mutual adhesion between the upper surface and the lower surface of the film bag is avoided; meanwhile, when the upper surface and the lower surface of the film bag are separated, the film bag is stretched by adopting the up-and-down relative motion of the bag stretching upper plate and the bag stretching lower plate on the inner side of the film bag; the separation process is from inside to outside, the upper surface and the lower surface of the film bag are not contacted with each other, and the upper surface and the lower surface of the film bag are not deformed due to larger bonding force generated by mutual contact; therefore, the condition that the films are irregularly deformed due to the fact that the films are simultaneously subjected to suction force and irregular bonding force when the upper and lower suction plates of the suction device drive the adhered upper and lower films to be separated through the suction force is avoided, and the opening quality of the film bag is improved.

Drawings

Fig. 1 is a schematic structural diagram of a forming bag opening device of the patent.

Fig. 2 is a schematic structural diagram of a package product.

Fig. 3 is a schematic structural view of the bag pulling assembly.

Fig. 4 is a partially enlarged structural view of the second tensioning element.

Fig. 5 is a schematic structural diagram of a lamination assembly.

Fig. 6 is a schematic structural view of the bag opening head.

Fig. 7 is a schematic structural diagram of a bag opening driving assembly.

Fig. 8 is a schematic structural view of the edge sealing device.

Fig. 9 is a schematic structural diagram of a heat shrink film sucking mechanism.

Fig. 10 is a schematic structural view of the corner cutting device.

Fig. 11 is a schematic view of the slitting mechanism.

Fig. 12 is a schematic view of the structure of the clamping assembly.

Fig. 13 is a schematic structural view of the cutting assembly.

Detailed Description

The following describes in detail embodiments of the present invention with reference to the drawings.

Example 1

The forming bag opening device 2 shown in fig. 1 comprises a forming mechanism 21 and a bag opening mechanism 22; the forming mechanism 21 and the bag opening mechanism 22 are fixed on the workbench, and the input end and the output end of the forming mechanism 21 are respectively connected with the input ends of the film feeding device and the bag opening mechanism 22; the output end of the bag opening mechanism 22 is respectively connected with the discharge hole of the packaging box feeding device and the feed hole of the edge sealing device; the forming mechanism 21 is used for forming the film; the bag opening mechanism 22 is used for opening the film bag manufactured by the forming mechanism 21.

The flow direction of the packing box product is as follows: a forming mechanism 21 to a bag opening mechanism 22.

Fig. 2 is a schematic structural diagram of a package product. The packing box product comprises a packing box a and a film bag b: the film bag b comprises a film bag inner hole c and a film bag opening d; after the packaging box a is embedded in the inner hole c of the film bag, the edge sealing device and the corner cutting device 5 sequentially carry out edge sealing and corner cutting on the opening d of the film bag, so that the packaging box a is wrapped in the closed film bag b.

As shown in fig. 1, 3 and 4, the forming mechanism 21 includes a bag pulling assembly 211 and a sealing assembly 212; the bag-pulling assembly 211 comprises a bag-pulling driving element 213, a first tensioning element 214, a second tensioning element 215 and a moving slide 216; the fixed ends of the first tensioning element 214 and the movable sliding table 216 are fixed at the output end of the bag pulling driving element 213, the second tensioning element 215 is connected with the movable end of the movable sliding table 216, and the distance between the first tensioning element 214 and the second tensioning element 215 corresponds to films with different widths; the first tensioning element 214 and the second tensioning element 215 each comprise a tensioning base 217, a tensioning cylinder 218 and a tensioning shoe 219; the tensioning cylinder 218 is hinged with the tensioning base 217, and the output end of the tensioning cylinder 218 is connected with one end of a tensioning pressing block 219; when the tensioning cylinder 218 extends out, the other end of the tensioning pressing block 219 presses the film to the surface of the tensioning base 217; the sealing assembly 212 is used for sealing when the film bag is manufactured; the bag-pulling driving element 213 is used to move the first tensioning element 214 and the second tensioning element 215. The bag pulling driving element 213 comprises a bag pulling driving motor 2131, a bag pulling driving screw rod guide rail 2132 and a bag pulling jacking cylinder 2133; the bag pulling driving motor 2131 and the bag pulling driving lead screw guide rail 2132 are fixed on the workbench, and the output end of the bag pulling driving motor 2131 is connected with a lead screw in the bag pulling driving lead screw guide rail 2132; the bag pulling and ejecting cylinder 2133 is connected with a slide block in the bag pulling driving screw rod guide rail 2132, and the output end of the bag pulling and ejecting cylinder 2133 is respectively connected with the first tensioning element 214 and the movable sliding table 216; both the first tensioning element 214 and the second tensioning element 215 further include a tensioning side-shifting cylinder 2141; the output end of the tensioning side shifting cylinder 2141 is connected with the tensioning base 217, and the motion direction of the output end of the tensioning side shifting cylinder 2141 is the same as the width direction of the film; the tension block 219 is hook shaped.

As shown in fig. 5, the molding mechanism 21 further includes a squeeze film assembly 210; the film pressing assembly 210 is fixed on the workbench, and the output end of the film pressing assembly 210 is in contact with the upper surface of the film; the lamination assembly 210 is used for preventing the film from wrinkling; film pressing assembly 210 comprises film pressing drive motor 2101, film pressing drive guide rail slider 2102 and film pressing head 2103; a film pressing driving motor 2101 and a film pressing driving guide rail sliding block 2102 are fixed on the workbench, and the output end of the film pressing driving motor 2101 is connected with a sliding block in the film pressing driving guide rail sliding block 2102; one end of the film pressing head 2103 is connected with a slide block in the film pressing driving guide rail slide block 2102, and the other end of the film pressing head 2103 is in contact with the upper surface of the film.

The forming mechanism 21, during operation: 1) adjusting the position of the second tensioning member 215 on the moving slide 216 to correspond to the width of the film; 2) the bag pulling driving motor 2131 acts to drive the first tensioning element 214 and the second tensioning element 215 to move to a position where the first tensioning element and the second tensioning element are connected with the film feeding device; 3) the action of the tensioning cylinder 218 drives the tensioning pressing block 219 to rotate to a position contacting with the surface of the film to press the film tightly; 4) the bag pulling driving element 213 and the sealing assembly 212 act to form the film into a film bag with two open ends to complete the forming process.

The forming mechanism 21 solves the problems that when a film bag is manufactured and a film is moved, a film is sucked by adopting a suction device with a fixed length, and then the suction device is driven by a driving device to move the film sucked by the suction device to a corresponding station; the suction device sucks the film through suction force generated by vacuum, and the requirement on the attaching degree between the suction device and the film is high when the suction force is generated by the vacuum; when the flatness of a suction base plate in the suction device is poor or the surface of a film is not flat, a certain gap is generated between the suction device and the film to destroy the joint degree between the suction device and the film, and a part of suction force of the suction device to the film flows out along the gap, so that the phenomenon that the suction device cannot firmly suck the film is generated; meanwhile, the air suction device with the fixed length can only suck the film with the length longer than that of the air suction device; when the length of the film is shorter, the suction holes longer than the film in the suction device can be leaked due to no fit with the film, so that the adaptability of the suction device is lower. By providing a forming mechanism 21; when forming films of different widths, the position of the second tensioning element 215 on the moving slide 216 is adjusted to correspond to the width of the film; the bag pulling driving motor 2131 acts to drive the first tensioning element 214 and the second tensioning element 215 to move to a position where the first tensioning element and the second tensioning element are connected with the film feeding device; the tensioning cylinder 218 is actuated to rotate the tensioning block 219 into contact with the surface of the film to compress the film. When the film is moved, the film is tightly pressed on the surface of the tensioning base 217 through the action of the tensioning pressing block 219, namely the film is fixedly moved in a clamping manner; when the film is moved in a clamping mode, the film is fixed through the pressing force between the tensioning pressing block 219 and the tensioning base 217, and the pressing force can be generated as long as the tensioning pressing block 219 and the tensioning base 217 are in contact with the surface of the film; when the air leakage condition of the air suction device is caused by the uneven surface of the film, the tensioning pressing block 219 and the tensioning base 217 can be in contact with the surface of the film and still can provide enough pressing force, so that the phenomenon that the air suction device is affected by the air leakage condition and cannot firmly suck the film is avoided. Meanwhile, the position adjustment of the second tensioning element 215 on the moving slide table 216 also enables the tensioning distance between the first tensioning element 214 and the second tensioning element 215 to be suitable for films with various widths, and the adaptability of the mechanism is improved.

As shown in fig. 1, the bag opening mechanism 22 includes a bag opening frame 23, a bag opening driving assembly 24 and a bag opening head 25; the bag opening frame 23 is fixed on the workbench, the bag opening driving assembly 24 is fixed on the bag opening frame 23, and the output end of the bag opening driving assembly 24 is connected with the bag opening head 25; the bag opening head 25 is driven by the bag opening driving component 24 to be respectively connected with the forming mechanism 21, the packaging box feeding device and the edge sealing device; the bag opening driving component 24 is used for driving the bag opening head 25 to move to different stations; the bag opening head 25 is used for opening the film bag.

As shown in fig. 6, the bag opening head 25 comprises a bag opening lower plate 251, a bag opening upper plate 252, a lower plate pressing block 253, a lower plate cylinder 254 and an upper plate suction head 255; the bag opening lower plate 251 is connected with the output end frame of the bag opening driving component 24, the bag opening upper plate 252 is connected with the output end movable part of the bag opening driving component 24, and the distance between the bag opening lower plate 251 and the inner side surface of the bag opening upper plate 252 is matched with the height of the packing box; the outer side surface of the bag opening lower plate 251 and the outer side surface of the bag opening upper plate 252 are respectively contacted with the upper surface of the film bag and the inner side of the lower surface of the film bag; the lower plate pressing blocks 253 are in running fit with the output end frame of the bag opening driving assembly 24, and the rotating ends of the lower plate pressing blocks 253 are connected with the output ends of the lower plate air cylinders 254; the upper plate suction head 255 is fixed on the bag opening upper plate 252, and the output end of the upper plate suction head 255 and the output end of the lower plate pressing block 253 are respectively contacted with the upper surface of the membrane bag and the outer side of the lower surface of the membrane bag. The suction force between the upper plate suction head 255 and the film is greater than the adhesive force between the bag opening upper plate 252 and the film; the adhesive force between the lower plate pressing block 253 and the film is larger than that between the lower plate 251 of the bag opening and the film; the bag supporting upper plate 252 is of a hollow structure; the distance between the upper plate suction head 255 and the bag opening upper plate 252 is larger than the thickness of the film; the pouch lower plate 251 and the pouch upper plate 252 each include a support plate fixing portion 2511 and a support plate winding portion 2512; the support plate fixing part 2511 of the bag opening lower plate 251 and the support plate fixing part 2511 of the bag opening upper plate 252 are respectively connected with the bag opening lower plate 251 and the bag opening upper plate 252; the support plate winding portion 2512 of the bag support lower plate 251 and the support plate winding portion 2512 of the bag support upper plate 252 are both in contact with the film; the support plate winding portion 2512 of the bag opening lower plate 251 and the support plate winding portion 2512 of the bag opening upper plate 252 are wound wider than the packing box.

As shown in fig. 7, the bag-opening driving assembly 24 includes a bag-opening first driving element 241, a bag-opening second driving element 242, and a bag-opening third driving element 243; the bag opening first driving element 241 is fixed on the workbench, and the output end of the bag opening first driving element 241 is connected with the bag opening second driving element 242; the output end of the bag opening second driving element 242 is connected with a bag opening third driving element 243, and the output end of the bag opening third driving element 243 is connected with the bag opening upper plate 252; the bag opening second driving element 242 is driven by an air cylinder.

The bag opening mechanism 22 is in operation: 1) the bag opening driving component 24 acts to drive the bag opening head 25 to move to a station connected with the forming mechanism 21; 2) the molding mechanism 21 winds the film on the support plate winding portion 2512 of the bag opening lower plate 251 and the bag opening upper plate 252 and makes an open bag; 3) the lower plate cylinder 254 acts to drive the lower plate pressing block 253 to press the film at the bag opening lower plate 251, and the upper plate suction head 255 firmly sucks the film at the bag opening upper plate 252; 4) the bag opening third driving element 243 moves to drive the bag opening upper plate 252 to move upwards to separate the upper surface and the lower surface of the film bag, and the packaging box feeding device feeds the packaging box into the separated film bag; 5) the lower plate cylinder 254 acts to drive the lower plate pressing block 253 to loosen the film at the bag opening lower plate 251, the upper plate suction head 255 loosens the film at the bag opening upper plate 252, and the bag opening driving assembly 24 drives the bag opening lower plate 251 and the bag opening upper plate 252 to move out of the inner side of the bag to complete the film bag opening process.

The bag opening mechanism 22 solves the problem that when the film bag is opened, the forming device firstly makes the film into the film bag with the upper film and the lower film in contact; then an upper suction plate and a lower suction plate of the suction device are respectively contacted with the upper side and the lower side of the film bag, and the suction device drives the upper suction plate and the lower suction plate to respectively move upwards and downwards to separate the upper side and the lower side of the film bag contacted with the suction plates; the surfaces of the films have certain viscosity, and when the upper and lower films of the film bag are contacted, the upper and lower films are adhered due to the viscosity of the surfaces; the material of the film is soft and is easy to deform when being stressed, and when the upper and lower suction plates of the suction device drive the adhered upper and lower films to be separated through suction, the film can be irregularly deformed due to the suction and irregular adhesion force; therefore, the membrane bag has different folds at the part of the membrane bag when the membrane bag is expanded, and the expanding quality of the membrane bag is influenced. By arranging the bag opening head 25; after the bag opening head 25 moves to a station connected with the forming mechanism 21, the forming mechanism 21 winds the films on the support plate winding parts 2512 of the bag opening lower plate 251 and the bag opening upper plate 252 to form an opening film bag; the lower plate cylinder 254 acts to drive the lower plate pressing block 253 to press the film at the bag opening lower plate 251, and the upper plate suction head 255 firmly sucks the film at the bag opening upper plate 252; the bag opening third driving element 243 moves to drive the bag opening upper plate 252 to move upwards to separate the upper surface and the lower surface of the film bag, and the packaging box feeding device feeds the packaging box into the separated film bag; the lower plate cylinder 254 acts to drive the lower plate pressing block 253 to loosen the film at the bag opening lower plate 251, the upper plate suction head 255 loosens the film at the bag opening upper plate 252, and the bag opening driving assembly 24 drives the bag opening lower plate 251 and the bag opening upper plate 252 to move out of the inner side of the bag to complete the film bag opening process. When in molding, the upper surface and the lower surface of the film bag are respectively contacted with the bag opening upper plate 252 and the bag opening lower plate 251 and are separated by the bag opening upper plate 252 and the bag opening lower plate 251 instead of the mutual contact of the upper surface and the lower surface of the film bag, so that the mutual adhesion of the upper surface and the lower surface of the film bag is avoided; meanwhile, when the upper surface and the lower surface of the film bag are separated, the film bag is stretched by adopting the up-and-down relative movement of the bag stretching upper plate 252 and the bag stretching lower plate 251 on the inner side of the film bag; the separation process is from inside to outside, the upper surface and the lower surface of the film bag are not contacted with each other, and the upper surface and the lower surface of the film bag are not deformed due to larger bonding force generated by mutual contact; therefore, the condition that the films are irregularly deformed due to the fact that the films are simultaneously subjected to suction force and irregular bonding force when the upper and lower suction plates of the suction device drive the adhered upper and lower films to be separated through the suction force is avoided, and the opening quality of the film bag is improved.

Claims

1. A film bag opening mechanism is characterized by comprising a bag opening frame (23), a bag opening driving component (24) and a bag opening head (25); the bag opening machine frame (23) is fixed on the workbench, the bag opening driving component (24) is fixed on the bag opening machine frame (23), and the output end of the bag opening driving component (24) is connected with the bag opening head (25); the bag opening head (25) is respectively connected with the forming mechanism, the packaging box feeding device and the edge sealing device under the driving of the bag opening driving component (24); the bag opening driving component (24) is used for driving the bag opening head (25) to move to different stations; the bag opening head (25) is used for opening the film bag;

the bag opening head (25) comprises a bag opening lower plate (251), a bag opening upper plate (252), a lower plate pressing block (253), a lower plate cylinder (254) and an upper plate suction head (255); the bag opening lower plate (251) is connected with an output end rack of the bag opening driving component (24), the bag opening upper plate (252) is connected with a movable part of an output end of the bag opening driving component (24), and the distance between the bag opening lower plate (251) and the inner side surface of the bag opening upper plate (252) is matched with the height of the packaging box; the outer side surface of the bag opening lower plate (251) and the outer side surface of the bag opening upper plate (252) are respectively contacted with the upper surface of the film bag and the inner side of the lower surface of the film bag; the lower plate compression blocks (253) are in running fit with the output end rack of the bag opening driving assembly (24), and the rotating ends of the lower plate compression blocks (253) are connected with the output end of a lower plate cylinder (254); the upper plate suction head (255) is fixed on the bag opening upper plate (252), and the output end of the upper plate suction head (255) and the output end of the lower plate pressing block (253) are respectively contacted with the upper surface of the film bag and the outer side of the lower surface of the film bag.

2. The film bag opening mechanism of claim 1, wherein the suction force between the suction head (255) of the upper plate and the film is greater than the adhesive force between the upper plate (252) of the opening bag and the film; the adhesive force between the lower plate pressing block (253) and the film is larger than that between the bag opening lower plate (251) and the film.

3. The film bag opening mechanism of claim 1, wherein the bag opening upper plate (252) is of a hollowed structure.

4. The film bag opening mechanism of claim 1, wherein the distance between the suction head (255) of the upper plate and the upper plate (252) of the opening bag is larger than the thickness of the film.

5. The film bag opening mechanism of claim 1, wherein the bag opening lower plate (251) and the bag opening upper plate (252) both comprise a support plate fixing portion (2511) and a support plate winding portion (2512); a support plate fixing part (2511) of the bag opening lower plate (251) and a support plate fixing part (2511) of the bag opening upper plate (252) are respectively connected with the bag opening lower plate (251) and the bag opening upper plate (252); the support plate winding part (2512) of the bag opening lower plate (251) and the support plate winding part (2512) of the bag opening upper plate (252) are both in contact with the film.

6. The film bag opening mechanism as claimed in claim 1, wherein the winding widths of the support plate winding portion (2512) of the bag opening lower plate (251) and the support plate winding portion (2512) of the bag opening upper plate (252) are both larger than the width of the packing box.

7. The film bag opening mechanism of claim 1, wherein the bag opening driving assembly (24) comprises a bag opening first driving element (241), a bag opening second driving element (242) and a bag opening third driving element (243); the bag opening first driving element (241) is fixed on the workbench, and the output end of the bag opening first driving element (241) is connected with the bag opening second driving element (242); the output end of the bag opening second driving element (242) is connected with a bag opening third driving element (243), and the output end of the bag opening third driving element (243) is connected with a bag opening upper plate (252).

8. The film bag opening mechanism of claim 1, wherein the second driving element (242) is driven by an air cylinder.

9. A method for opening a bag with a thin film bag, which is characterized by using the thin film bag opening mechanism of claim 1, and comprises the following steps:

1) the bag opening driving component (24) acts to drive the bag opening head (25) to move to a station connected with the forming mechanism;

2) the forming mechanism winds the film on a support plate winding part (2512) of the bag opening lower plate (251) and the bag opening upper plate (252) and produces an opening film bag;

3) the lower plate cylinder (254) acts to drive the lower plate pressing block (253) to press the film at the bag opening lower plate (251), and the upper plate suction head (255) firmly sucks the film at the bag opening upper plate (252);

4) the bag opening third driving element (243) acts to drive the bag opening upper plate (252) to move upwards to separate the upper surface and the lower surface of the film bag, and the packaging box feeding device feeds the packaging box into the separated film bag;

5) the lower plate air cylinder (254) acts to drive the lower plate pressing block (253) to loosen the film at the bag opening lower plate (251), the upper plate suction head (255) loosens the film at the bag opening upper plate (252), and the bag opening driving assembly (24) drives the bag opening lower plate (251) and the bag opening upper plate (252) to move out of the inner side of the bag to complete the film bag opening process.

10. The film bag forming and bag opening device is characterized by comprising a forming mechanism (21) and a bag opening mechanism (22); the bag opening mechanism (22) adopts a film bag opening mechanism of claim 1; the forming mechanism (21) and the bag opening mechanism (22) are fixed on the workbench, and the input end and the output end of the forming mechanism (21) are respectively connected with the input ends of the film feeding device and the bag opening mechanism (22); the output end of the bag opening mechanism (22) is respectively connected with the discharge hole of the packaging box feeding device and the feed hole of the edge sealing device; the forming mechanism (21) is used for forming the film; the bag opening mechanism (22) is used for opening the film bag made by the forming mechanism (21).