Packaging bag forming equipment

Abstract

The present invention discloses a packaging bag forming device, comprising a frame; a first unwinding mechanism for releasing a first film material; a winding mechanism for connecting the first film material; a preforming mechanism capable of resting against the first film material to form a first lower film segment, a first corner portion, and a first upper film segment connected in sequence, and a storage cavity surrounded by a side opening; a conveying device for inputting products into the storage cavity and conveying the products wrapped by the first film material forward; an end welding mechanism for welding one end of the first lower film segment and the first upper film segment to form a first welding band; a side welding mechanism for welding the two side edges of the first lower film segment and the first upper film segment to form a second welding band and a third welding band. The above packaging bag forming device can drive the first film material to be close to the outer surface of the product, avoid wrinkling of the packaging bag, facilitate label attachment and automatic identification production, and can be applied to packaging bags of various sizes, facilitating the production and manufacturing of packaging bags.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging bags, and in particular to packaging bag forming equipment. Background Art

[0002] In the prior art, most common packaging bags are back-sealed. Back-sealed packaging bags are formed by folding the edges of the film material on both sides of the transport direction toward the middle, and then using a heated roller device to heat-seal the two side edges of the film material together to form a packaging bag with a welding band on the back.

[0003] This type of bag forming equipment requires a forming mechanism that matches the shape and size of the bag's inner cavity to guide the two side edges of the film material toward the center. To produce different bags, a forming mechanism of the corresponding shape is required. This is not conducive to expanding the applicability of the bag forming equipment, resulting in inconvenient production and high production costs. Furthermore, the use of a heated roller device to heat-seal the two side edges of the film material together is prone to cold welds or poor weld sealing, resulting in defective products. When multiple back-seal bags need to be stacked and placed, the weld bands of the back-seal bags form bulges, affecting the storage and transportation of the packaged products. When labels need to be applied to the back of the bag, they are prone to wrinkling, which is not conducive to automated identification production.

[0004] Related technologies also include packaging bag forming equipment that uses two films, one on top and one on the bottom, to cover the upper and lower surfaces of a product, and then heat-seals the two films around the edges of the product. These films are automatically unwound. However, due to the thickness of the wrapped product, the film cannot be properly adhered to the surface during the downward pressure seal, resulting in wrinkles in the bag and affecting packaging quality. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one of the objectives of the present invention is to provide a packaging bag forming device that is suitable for packaging bags of various sizes, facilitates the production of packaging bags, and provides stable quality. Furthermore, the packaging bags produced by this packaging bag forming device adhere closely to the outer surface of the product, preventing wrinkles, facilitating labeling and automated identification production.

[0006] According to an embodiment of the present invention, a packaging bag forming device comprises: a frame; a first unwinding mechanism, which is provided on the frame and is used to connect one end of a first film material to release the first film material; a winding mechanism, which is provided on the frame and is used to connect the other end of the first film material to wind up the first film material; a preforming mechanism, which is provided on the frame and can abut against one side of the first film material to bend the first film material to form a first lower film segment, a first corner portion and a first upper film segment connected in sequence, wherein the first lower film segment, the first corner portion and the first upper film segment form a storage cavity with an open side; a conveying device, which is provided on the frame and is used to input the product to be packaged into the packaging cavity The storage cavity and the product to be covered by the first film material are conveyed forward; the end welding mechanism and the side welding mechanism are arranged at intervals along the conveying direction of the conveying device, and the end welding mechanism is used to weld the first lower film segment and the first upper film segment at one end away from the first corner portion together to form a first welding band, and the side welding mechanism is used to weld the adjacent two side edges of the first lower film segment and the first upper film segment together to form a second welding band and a third welding band. The first film material, the first welding band, the second welding band and the third welding band jointly define a rectangular covering space.

[0007] The packaging bag forming device according to the embodiment of the present invention has at least the following beneficial effects:

[0008] The above packaging bag forming equipment uses a preforming mechanism to drive the first film material to bend to form a first lower film segment, a first corner portion, a first upper film segment and a storage cavity. After the product is input into the storage cavity along the side opening, the first lower film segment, the first corner portion, and the first upper film segment are respectively close to the bottom surface, one side surface and the upper surface of the product, and then the first welding band, the second welding band and the third welding band are formed through the end welding mechanism and the side welding mechanism, so as to be close to the outer surface of the product, avoid wrinkling of the packaging bag, facilitate label attachment and automatic identification production, and can be applied to packaging bags of various sizes, which is convenient for the production and manufacturing of packaging bags.

[0009] In some embodiments of the present invention, the frame is provided with a plurality of conveying rollers, which are used to guide the first film material to move from the first unwinding mechanism to the winding mechanism, wherein the first film material between the two conveying rollers corresponds to the transmission device, and the preforming mechanism includes a pushing member and a first driver connected to the pushing member, and the first driver drives the pushing member to press against the first film material to form the first lower film segment, the first corner portion and the first upper film segment. The preforming mechanism also includes a positioning component, and the positioning component is used to contact the two ends of the inner surface of the first corner portion to stabilize the shape of the storage cavity.

[0010] In some embodiments of the present invention, the pushing member is a rod member arranged along the width direction of the first film material, the first driver includes two push rods respectively connected to the two ends of the rod member, the push rod is arranged upward and tilted away from one end of the rod member, the push rod is connected to a first linear driver that drives it to move telescopically along the length direction, the frame is rotatably provided with a mounting frame, and the first linear driver is arranged on the mounting frame.

[0011] In some embodiments of the present invention, the positioning assembly includes two positioning columns arranged relatively on both sides of the width direction of the first film material and a second linear drive connected to the positioning columns, the second linear drive is used to drive the positioning columns to extend into or exit the first corner portion along the width direction of the first film material, and the second linear drive is connected to a third linear drive that drives the second linear drive and the positioning columns to move along the conveying direction of the transmission device.

[0012] In some embodiments of the present invention, the transmission device includes a feed conveying mechanism and a discharge conveying mechanism respectively located on both sides of the first film material, the feed conveying mechanism includes a receiving table for receiving and packaging products and a side pushing mechanism provided on one side of the receiving table for pushing the products on the receiving table into the storage cavity along the side opening, the end welding mechanism has a cutting component for cutting the first film material formed with the first welding band, and the discharge conveying mechanism is used to receive the product coated with the first film material after being cut by the cutting component.

[0013] In some embodiments of the present invention, the end welding mechanism includes a first lower heat sealing knife and a first upper heat sealing knife, the first lower heat sealing knife is provided with a first lower heat sealing strip and a second lower heat sealing strip extending along the width direction of the first film material, and the first upper heat sealing knife is provided with a first upper heat sealing strip and a second upper heat sealing strip extending along the width direction of the first film material, the first lower heat sealing strip and the first upper heat sealing strip are in contact with each other to form the first welding band on the first film material, the second lower heat sealing strip and the second upper heat sealing strip are in contact with each other to form the fourth welding band on the first film material, the cutting component is provided in parallel between the first lower heat sealing strip and the second lower heat sealing strip, and / or the cutting component is provided in parallel between the first upper heat sealing strip and the second upper heat sealing strip.

[0014] In some embodiments of the present invention, the side welding mechanism includes a first side welding assembly and a second side welding assembly respectively located on both sides of the conveying direction of the discharge conveying mechanism, the first side welding assembly and the second side welding assembly are respectively used to form the second welding band and the third welding band on the first film material, and the first side welding assembly or the second side welding assembly is provided with a vacuum exhaust assembly for extracting the air between the first film material and the product.

[0015] In some embodiments of the present invention, the frame is provided with a downward moving mechanism located above the transmission device, and the downward moving mechanism is used to drive the first upper film segment to be tightly attached to the upper surface of the product and move toward the position of the side welding mechanism.

[0016] In some embodiments of the present invention, the downward-pressing moving mechanism includes two downward-pressing transverse-moving components respectively arranged on both sides of the conveying direction of the transmission device, and the downward-pressing transverse-moving components include a transverse-moving drive arranged on the frame and a lifting drive connected to the transverse-moving drive, and the output end of the lifting drive is connected to a downward-pressing plate.

[0017] In some embodiments of the present invention, a second unwinding mechanism is further provided on the frame, and the second unwinding mechanism is used to release the buffer layer. The end of the buffer layer away from the second unwinding mechanism is connected to the winding mechanism, and the part of the buffer layer close to the preforming mechanism is adhered to the side of the first film material. The preforming mechanism can abut against the buffer layer to bend the buffer layer to form a second lower wrapping surface, a second side wrapping surface and a second upper wrapping surface connected in sequence.

[0018] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0020] Figure 1 It is a structural schematic diagram of an embodiment of the packaging bag forming equipment of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of the embodiment when the first unwinding mechanism, the second unwinding mechanism, the winding mechanism, the first film material, and the buffer layer are combined and the preforming mechanism is in operation;

[0022] Figure 3 for Figure 1A schematic structural diagram of the embodiment of the present invention showing a combination of a preforming mechanism, a conveying device, an end welding mechanism, a side welding mechanism and a downward pressing mechanism;

[0023] Figure 4 A schematic diagram of a forming process of a packaging bag produced by a packaging bag forming device according to an embodiment;

[0024] Figure 5 This is a structural diagram of the first welding band and the fourth welding band after being formed on the first film material and the buffer layer. DETAILED DESCRIPTION

[0025] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0026] In the description of the present invention, it should be understood that descriptions involving orientations, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0027] In the description of the present invention, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0028] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0029] See also Figures 1 to 4, a packaging bag forming device of the present invention includes: a frame 100; a first unwinding mechanism 200, which is provided on the frame 100 and is used to connect one end of the first film material 10 to release the first film material 10; a winding mechanism 300, which is provided on the frame 100 and is used to connect the other end of the first film material 10 to wind the first film material 10; a preforming mechanism 400, which is provided on the frame 100 and can be pressed against one side of the first film material 10 to bend the first film material 10 to form a first lower film segment 11, a first corner portion 12 and a first upper film segment 13 connected in sequence, and the first lower film segment 11, the first corner portion 12 and the first upper film segment 13 form a storage cavity with a side opening; a transmission device 500, which is provided on the frame 100 and is used to transfer The product to be packaged is input into the storage cavity and the product to be covered by the first film material 10 is conveyed forward; the end welding mechanism 600 and the side welding mechanism 700 are arranged at intervals along the transmission direction of the transmission device 500, and the end welding mechanism 600 is used to weld the end of the first lower film segment 11 and the first upper film segment 13 away from the first corner portion 12 together to form a first welding band 14, and the side welding mechanism 700 is used to weld the adjacent two side edges of the first lower film segment 11 and the first upper film segment 13 together to form a second welding band 15 and a third welding band 16. The first film material 10, the first welding band 14, the second welding band 15 and the third welding band 16 together define a rectangular covering space.

[0030] The above packaging bag forming equipment uses a preforming mechanism 400 to drive the first film material 10 to bend to form a first lower film segment 11, a first corner portion 12, a first upper film segment 13 and a storage cavity. After the product is input into the storage cavity along the side opening, the first lower film segment 11, the first corner portion 12, and the first upper film segment 13 are respectively close to the bottom surface, one side surface and the upper surface of the product, and then the first welding band 14, the second welding band 15 and the third welding band 16 are formed through the end welding mechanism 600 and the side welding mechanism 700, so as to be close to the outer surface of the product, avoid wrinkling of the packaging bag, facilitate label attachment and automatic identification production, and can be applicable to packaging bags of various sizes, which is convenient for the production and manufacturing of packaging bags.

[0031] See also Figure 1 and Figure 2In some embodiments of the present invention, the frame 100 is provided with a plurality of conveying rollers 110, which are used to guide the first film material 10 to move from the first unwinding mechanism 200 to the winding mechanism 300, wherein the first film material 10 between the two conveying rollers 110 corresponds to the transmission device 500, and the preforming mechanism 400 includes a pushing member 410 and a first driver 420 connected to the pushing member 410, and the first driver 420 drives the pushing member 410 to press against the first film material 10 to form a first lower film segment 11, a first corner portion 12 and a first upper film segment 13. The preforming mechanism 400 also includes a positioning component 430, which is used to contact the two ends of the inner surface of the first corner portion 12 to stabilize the shape of the storage cavity. It is understood that when the first driver 420 drives the pusher 410 to abut against the first film 10 between two of the conveyor rollers 110, the pusher 410 abuts against the first film 10 and moves according to a preset stroke. At this time, the first film 10 between the two conveyor rollers 110 can form a storage cavity with a side opening. The positioning assembly 430 then abuts against both ends of the inner surface of the first corner portion 12 to maintain the first film 10 in a tensioned state, thereby stabilizing the shape of the storage cavity and its side opening. The pusher 410 then withdraws from the storage cavity to facilitate the entry of the product through the side opening of the storage cavity. The preforming mechanism 400 has a simple structure and is easy to use.

[0032] In addition, it should be noted that by adjusting the travel of the push member 410, it is also possible to adapt to products to be packaged of different lengths. Figure 2 and Figure 4 In a preferred embodiment of the present invention, the lengths of the first lower film segment 11 and the first upper film segment 13 are both smaller than the length of the product. When the product to be packaged is placed between the first lower film segment 11 and the first upper film segment 13, one side wall of the product abuts the first corner portion 12, and the bottom surface of the product abuts the first lower film segment 11. At this time, the winding mechanism 300 is locked. Since the lengths of the first lower film segment 11 and the first upper film segment 13 are both smaller than the length of the product, the first lower film segment 11 can only fit a portion of the bottom surface of the product, and the first upper film segment 13 can only fit a portion of the top surface of the product. At this time, the product is further pushed forward to cause the first unwinding mechanism 200 to release the first film material 10. The released first film material 10 moves sequentially along the bottom, side, and top surfaces of the product, thereby extending the first lower film segment 11 and the first upper film segment 13 to evenly fit and cover the surface of the product. This ensures that the first film material 10 is tightly wrapped around the outer surface of the product without smoothing, thereby preventing wrinkles in the packaging bag and facilitating automated production methods for scanning codes after labeling.

[0033] See also Figure 3In some embodiments of the present invention, to ensure that the first film material 10 does not wrinkle in the width direction, the push member 410 is a rod disposed along the width direction of the first film material 10. To ensure that the rod rests against the first film material 10 parallel to the width direction of the first film material 10, the first actuator 420 includes two push rods 421 connected to each end of the rod. At the same time, to prevent the product from being pushed into the storage cavity, the push rods 421 are arranged upwardly and tilted away from the end of the rod. The push rods 421 are connected to a first linear actuator 422 that drives them to move telescopically along the length direction. The frame 100 is rotatably provided with a mounting bracket 423, and the first linear actuator 422 is mounted on the mounting bracket 423. It is understood that the mounting bracket 423 is rotatably provided on the frame 100 to adjust the angular position of the push rods 421, thereby ensuring that the rods can form the first corner portion 12 of a predetermined shape and position on the first film material 10.

[0034] See also Figure 3 In some embodiments of the present invention, the positioning assembly 430 includes two positioning posts 431 arranged oppositely on either side of the first film 10 in the width direction, and a second linear actuator 432 connected to the positioning posts 431. The second linear actuator 432 is used to drive the positioning posts 431 to extend into or out of the first corner portion 12 along the width direction of the first film 10. The second linear actuator 432 is connected to a third linear actuator 433 that drives the second linear actuator 432 and the positioning posts 431 along the conveying direction of the conveyor 500. It will be understood that when the two second linear actuators 432 respectively drive the positioning posts 431 to extend into the side edges of the first film 10 corresponding to the first corner portion 12, the two positioning posts 431 can maintain the first film 10 in a U-shape with open sides. It should be noted that when the size of the packaging bag to be formed is large, since the movement range of the first linear drive 422 is limited, the third linear drive 433 is used to drive the second linear drive 432 and the positioning column 431 to move along the conveying direction of the transmission device 500 to form a larger U-shaped first film material 10, which is suitable for manufacturing larger packaging bags.

[0035] In this embodiment, the first linear drive 422 and the second linear drive 432 are both cylinders, and the third linear drive 433 is a horizontally arranged linear module. Of course, in other embodiments, the first linear drive 422, the second linear drive 432, and the third linear drive 433 can also be replaced by linear drive devices such as the electric push rod 421.

[0036] See also Figure 1 and Figure 3In some embodiments of the present invention, the transmission device 500 includes a feed conveying mechanism 510 and a discharge conveying mechanism 520 located on both sides of the first film material 10. The feed conveying mechanism 510 includes a receiving platform 511 for receiving the packaged products and a side pushing mechanism 512 provided on one side of the receiving platform 511 for pushing the products on the receiving platform 511 into the storage cavity along the side opening. The end welding mechanism 600 includes a cutting component 610 for cutting the first film material 10 formed with the first welding band 14. The discharge conveying mechanism 520 is used to receive the products coated with the first film material 10 after being cut by the cutting component 610. Figure 3 and Figure 4 It can be understood that the product to be packaged is placed on the receiving table 511. After the preforming mechanism 400 drives the first film material 10 to bend to form the first lower film segment 11, the first corner portion 12, the first upper film segment 13 and the storage cavity, the side pushing mechanism 512 pushes the product into the storage cavity along the side opening of the storage cavity. The first lower film segment 11, the first corner portion 12 and the first upper film segment 13 are respectively tightly attached to the bottom surface, one side surface and the upper surface of the product. After the end welding mechanism 600 forms the first welding band 14, the outside of the product is wrapped with the first film material 10 that is circled along the conveying direction of the transmission device 500. At this time, the two sides of the first film material 10 along the conveying direction of the transmission device 500 have not been sealed. The cutting component 610 cuts the first film material 10 with the first welding band 14, thereby conveying the product wrapped with the first film material 10 to the position of the side welding mechanism 700 for welding to obtain the second welding band 15 and the third welding band 16. Figure 3 In this embodiment, the receiving platform 511 is provided with a plurality of lifting frames for rollers and capable of rising and falling relative to the rollers. When the lifting frames extend upward from the rollers, they are used to receive the products to be packaged. The lifting frames are provided with belts for conveying the products to the top of the rollers. After the lifting frames are lowered, the products can fall onto the rollers and are pushed into the storage cavity by the side pushing mechanism 512.

[0037] See also Figure 3 and Figure 5In some embodiments of the present invention, the end welding mechanism 600 includes a first lower heat sealing knife 620 and a first upper heat sealing knife 630. The first lower heat sealing knife 620 is provided with a first lower heat sealing strip 621 and a second lower heat sealing strip 622 extending along the width direction of the first film material 10 at intervals. The first upper heat sealing knife 630 is provided with a first upper heat sealing strip 631 and a second upper heat sealing strip 632 extending along the width direction of the first film material 10 at intervals. The first lower heat sealing strip 621 and the first upper heat sealing strip 631 contact each other to form a first welding band 14 on the first film material 10, and the second lower heat sealing strip 622 and the second upper heat sealing strip 632 contact each other to form a fourth welding band 17 on the first film material 10. The cutting assembly 610 is provided in parallel between the first lower heat sealing strip 621 and the second lower heat sealing strip 622, and / or the cutting assembly 610 is provided in parallel between the first upper heat sealing strip 631 and the second upper heat sealing strip 632. In this embodiment, the cutting assembly 610 is a blade with the blade facing upwards and disposed between the first lower heat sealing strip 621 and the second lower heat sealing strip 622. The blade is connected to a cylinder that drives it up and down. It should be noted that when the first lower heat sealing blade 620 and the first upper heat sealing blade 630 approach each other, the first lower heat sealing strip 621 and the first upper heat sealing strip 631 contact each other to form a first welding band 14 on the first film 10, and the second lower heat sealing strip 622 and the second upper heat sealing strip 632 contact each other to form a fourth welding band 17 on the first film 10. Then, the cylinder drives the blade to rise to cut the first film 10 between the first welding band 14 and the fourth welding band 17. Figure 5 At the dotted position shown, at this time, the first film material 10 wrapped around the outside of the product can be separated from the first film material 10 on the first unwinding mechanism 200 and the rewinding mechanism 300, and the fourth welding band 17 is formed on the first film material 10 connected between the first unwinding mechanism 200 and the rewinding mechanism 300, ensuring that the first film material 10 can be continuously unwound for wrapping the next product.

[0038] See also Figure 3 In some embodiments of the present invention, the side welding mechanism 700 includes a first side welding assembly 710 and a second side welding assembly 720, which are respectively located on both sides of the conveying direction of the discharge conveying mechanism 520. The first side welding assembly 710 and the second side welding assembly 720 are respectively used to form a second welding band 15 and a third welding band 16 on the first film material 10. In order to prevent the presence of more gas between the product and the first film material 10 and affect the first film material 10 from better fitting to the surface of the product, a vacuum exhaust assembly 730 for extracting the air between the first film material 10 and the product is provided on the first side welding assembly 710 or the second side welding assembly 720.

[0039] See also Figure 1In some embodiments of the present invention, in order to ensure that the first film material 10 can fit the surface of the product before welding to form the second welding band 15 and the third welding band 16, and at the same time to play the role of positioning the welding positions of the second welding band 15 and the third welding band 16, the frame 100 is provided with a downward pressing moving mechanism 800 located above the transmission device 500. The downward pressing moving mechanism 800 is used to drive the first upper film segment 13 to fit tightly against the upper surface of the product and move toward the position of the side welding mechanism 700.

[0040] See also Figure 3 In some embodiments of the present invention, the downward pressing movement mechanism 800 includes two downward pressing transverse moving components 810 respectively provided on both sides of the conveying direction of the transmission device 500. The downward pressing transverse moving component 810 includes a transverse moving driver 811 provided on the frame 100 and a lifting driver 812 connected to the transverse moving driver 811. The output end of the lifting driver 812 is connected to the downward pressing plate 813. It can be understood that after the end welding mechanism 600 forms the first welding band 14 on the first film material 10, the cutting component 610 cuts the first film material 10 on the side of the first welding band 14 away from the product, and then one of the downward pressing transverse moving components 810 works. Specifically, the lifting driver 812 drives the downward pressing plate 813 to press against the first upper film segment 13 to fit the upper surface of the product. At this time, the first lower film segment 11 presses against the transmission device 500, and the transverse moving driver 811 cooperates with the transmission device 500 to drag the film material 10 wrapped with the first film material 10. The product (0) is moved to the corresponding position of the side welding mechanism 700, thereby completing the welding of the second welding band 15 and the third welding band 16. Simultaneously, the preforming mechanism 400 again bends the first film 10 to form the first lower film segment 11, the first corner portion 12, the first upper film segment 13, and the storage cavity. Another product is then loaded into the storage cavity. After the end welding mechanism 600 forms the first welding band 14 on the first film 10 on the exterior of this product, another downward pressing and transverse moving assembly 810 moves over the product to repeat the above process. The downward pressing and moving mechanism 800 with this structure maintains the continuity of the packaging process, eliminating the need for waiting and improving the packaging rate.

[0041] See also Figure 1In some embodiments of the present invention, the frame 100 is further provided with a second unwinding mechanism 900, which is used to release the buffer layer 20. The end of the buffer layer 20 away from the second unwinding mechanism 900 is connected to the rewinding mechanism 300. The portion of the buffer layer 20 adjacent to the preforming mechanism 400 is attached to the side of the first film 10. The preforming mechanism 400 can abut against the buffer layer 20, bending the buffer layer 20 to form a sequentially connected second lower wrapping surface 21, a second side wrapping surface 22, and a second upper wrapping surface 23. It will be appreciated that when the product is fragile, the provision of the buffer layer 20 can effectively protect the product from damage due to impact, falling, and the like. Moreover, preferably, one end of the first lower film segment 11 away from the first corner portion 12, one end of the first upper film segment 13 away from the first corner portion 12, one end of the second lower wrapping surface 21 away from the second side wrapping surface 22, and one end of the second upper wrapping surface 23 away from the second side wrapping surface 22 are welded together by a first welding band 14, wherein the two sides of the first lower film segment 11, the second lower wrapping surface 21, the first upper film segment 13 and the second upper wrapping surface 23 are respectively heat-sealed to form the above-mentioned second welding band 15 and the third welding band 16, the buffer layer 20 and the first film material 10 can form a double-layer structure packaging bag, and the buffer layer 20 cannot move relative to the first film material 10, ensuring that the first film material 10, the buffer layer 20 and the product are tightly combined, so that the whole composed of the first film material 10 and the buffer layer 20 can be close to the outer surface of the product, thereby ensuring the quality of product packaging.

[0042] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A packaging bag forming device, characterized in that: include: rack(100); A first unwinding mechanism (200), provided on the frame (100), and used for connecting to one end of the first film material (10) to release the first film material (10); A winding mechanism (300) is provided on the frame (100) and is used to connect to the other end of the first film material (10) to wind up the first film material (10); a preforming mechanism (400) provided on the frame (100) and capable of leaning against one side of the first film material (10) to bend the first film material (10) to form a first lower film segment (11), a first corner portion (12), and a first upper film segment (13) connected in sequence, wherein the first lower film segment (11), the first corner portion (12), and the first upper film segment (13) enclose a storage cavity with a side opening; A transmission device (500) is provided on the frame (100) and is used to input the product to be packaged into the storage cavity and to transport the product to be wrapped by the first film material (10) forward; An end welding mechanism (600) and a side welding mechanism (700) are respectively arranged at intervals along the transmission direction of the transmission device (500); the end welding mechanism (600) is used to weld together the ends of the first lower film segment (11) and the first upper film segment (13) away from the first corner portion (12) to form a first welding band (14); the side welding mechanism (700) is used to weld together the adjacent two side edges of the first lower film segment (11) and the first upper film segment (13) to form a second welding band (15) and a third welding band (16); the first film material (10), the first welding band (14), the second welding band (15) and the third welding band (16) together define a rectangular covering space; The frame (100) is provided with a plurality of conveying rollers (110), and the conveying rollers (110) are used to guide the first film material (10) to move from the first unwinding mechanism (200) to the winding mechanism (300), wherein the first film material (10) between two of the conveying rollers (110) corresponds to the transmission device (500), and the preforming mechanism (400) includes a pushing member (410) and a first driver (420) connected to the pushing member (410), and the first driver (420) drives the pushing member (410) to press against the first film material (10) to form the first lower film segment (11), the first corner portion (12) and the first upper film segment (13), and the preforming mechanism (400) also includes a positioning component (430), and the positioning component (430) is used to contact the first The two ends of the inner surface of the corner portion (12) are in contact with each other to stabilize the shape of the storage cavity; the transmission device (500) includes a feeding conveying mechanism (510) and a discharging conveying mechanism (520) respectively located on both sides of the first film material (10), the feeding conveying mechanism (510) includes a receiving platform (511) for receiving and packaging products and a side pushing mechanism (512) provided on one side of the receiving platform (511) for pushing the products on the receiving platform (511) into the storage cavity along the side opening, the end welding mechanism (600) has a cutting component (610) for cutting the first film material (10) formed with the first welding band (14), and the discharging conveying mechanism (520) is used to receive the products coated with the first film material (10) after being cut by the cutting component (610).

2. The packaging bag forming equipment according to claim 1, characterized in that: The pushing member (410) is a rod member arranged along the width direction of the first film material (10), and the first driver (420) includes two push rods (421) respectively connected to the two ends of the rod member, and the push rod (421) is arranged upward and tilted away from one end of the rod member. The push rod (421) is connected to a first linear driver (422) that drives it to move telescopically along the length direction. The frame (100) is rotatably provided with a mounting frame (423), and the first linear driver (422) is arranged on the mounting frame (423).

3. The packaging bag forming equipment according to claim 1, characterized in that: The positioning assembly (430) includes two positioning posts (431) arranged oppositely on both sides of the width direction of the first film material (10) and a second linear drive (432) connected to the positioning posts (431), wherein the second linear drive (432) is used to drive the positioning posts (431) to extend into or exit the first corner portion (12) along the width direction of the first film material (10), and the second linear drive (432) is connected to a third linear drive (433) that drives the second linear drive (432) and the positioning posts (431) to move along the conveying direction of the transmission device (500).

4. The packaging bag forming equipment according to claim 1, characterized in that: The end welding mechanism (600) comprises a first lower heat sealing knife (620) and a first upper heat sealing knife (630), wherein the first lower heat sealing knife (620) is provided with a first lower heat sealing strip (621) and a second lower heat sealing strip (622) extending in the width direction of the first film material (10), and the first upper heat sealing knife (630) is provided with a first upper heat sealing strip (631) and a second upper heat sealing strip (632) extending in the width direction of the first film material (10), wherein the first lower heat sealing strip (621) and the first upper heat sealing strip (632) are provided with a first lower heat sealing strip (621) and a second upper heat sealing strip (632) extending in the width direction of the first film material (10). 31) contact each other to form the first welding band (14) on the first film material (10), the second lower heat sealing strip (622) and the second upper heat sealing strip (632) contact each other to form a fourth welding band (17) on the first film material (10), the cutting component (610) is arranged in parallel between the first lower heat sealing strip (621) and the second lower heat sealing strip (622), and / or the cutting component (610) is arranged in parallel between the first upper heat sealing strip (631) and the second upper heat sealing strip (632).

5. The packaging bag forming equipment according to claim 1, characterized in that: The side welding mechanism (700) includes a first side welding assembly (710) and a second side welding assembly (720) respectively located on both sides of the conveying direction of the discharge conveying mechanism (520), the first side welding assembly (710) and the second side welding assembly (720) being used to form the second welding band (15) and the third welding band (16) on the first film material (10), respectively, and a vacuum exhaust assembly (730) for extracting air between the first film material (10) and the product is provided on the first side welding assembly (710) or the second side welding assembly (720).

6. The packaging bag forming equipment according to claim 1, characterized in that: The frame (100) is provided with a downward pressing moving mechanism (800) located above the transmission device (500), and the downward pressing moving mechanism (800) is used to drive the first upper film section (13) to be closely attached to the upper surface of the product and move toward the position of the side welding mechanism (700).

7. The packaging bag forming equipment according to claim 6, characterized in that: The downward pressing moving mechanism (800) includes two downward pressing transverse moving components (810) respectively arranged on both sides of the conveying direction of the transmission device (500), and the downward pressing transverse moving component (810) includes a transverse moving driver (811) arranged on the frame (100) and a lifting driver (812) connected to the transverse moving driver (811), and the output end of the lifting driver (812) is connected to a downward pressing plate (813).

8. The packaging bag forming equipment according to claim 1, characterized in that: The frame (100) is further provided with a second unwinding mechanism (900), which is used to release the buffer layer (20), and one end of the buffer layer (20) away from the second unwinding mechanism (900) is connected to the winding mechanism (300), and the portion of the buffer layer (20) close to the preforming mechanism (400) is attached to the side of the first film material (10), and the preforming mechanism (400) can abut against the buffer layer (20) to bend the buffer layer (20) to form a second lower wrapping surface (21), a second side wrapping surface (22) and a second upper wrapping surface (23) connected in sequence.

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