Packaging bag forming device and method

Abstract

The present invention relates to the technical field of packaging bag forming, and provides a packaging bag forming device and method, including a bag forming frame, a film roll bearing device, a film pulling device and a bag separation device; the film pulling device includes a film pulling mechanism and a film guide channel; the bag separation device includes a bag carrying mechanism, a bag hot cutting mechanism, a bag pressing mechanism and a bag wheel driving mechanism; the bag carrying mechanism is located at the exit of the film guide channel, and includes a bag carrying main roller and a bag carrying conveyor belt; the bag hot cutting mechanism includes a bag hot cutting roller located between the bag carrying main roller and the exit of the film guide channel and a bag hot cutting knife located above the bag hot cutting roller; the bag wheel driving mechanism includes a first bag driven wheel coaxially fixed with the bag hot cutting roller and a second bag driven wheel coaxially fixed with the bag carrying main roller; wherein the diameter of the bag carrying main roller is larger than the diameter of the bag hot cutting roller. Compared with the prior art, the production efficiency and capacity are improved, the labor cost is saved, and the production cost is reduced.

Description

Technical Field

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

[0002] Currently, packaging bags made of thermoplastic films are used to package products to protect them.

[0003] Traditional packaging bags are mainly made by manually folding the film in half, and then using a hot knife to seal both sides of the folded film to obtain a packaging bag with one side open, then putting the product in the opening, and then heat-sealing the opening. Since packaging bags are mainly made manually, the work efficiency is low and the labor cost is too high. Summary of the invention

[0004] The object of the present invention is to provide a packaging bag forming device and method to solve the technical problems of low working efficiency and high production cost in the prior art.

[0005] The present invention provides a packaging bag forming device, comprising a bag forming frame and the following device supported on the bag forming frame:

[0006] A film roll bearing device, used for mounting a folded film roll, wherein the folded film roll is formed by winding a folded film;

[0007] a film pulling device, comprising a film pulling mechanism for moving the folded film and a film guiding channel for allowing the folded film to pass through and guiding the movement of the folded film; and

[0008] A bag separation device comprising:

[0009] A bag carrying mechanism, located at the exit of the film guiding channel, the bag carrying mechanism comprising a bag carrying main roller and a bag carrying slave roller arranged in sequence in the moving direction of the folded film, and a bag carrying conveyor belt wrapped therebetween and used for placing the folded film;

[0010] a bag hot cutting mechanism, comprising a bag hot cutting roller located between the bag carrying main roller and the outlet of the film guiding channel, a bag hot cutting knife located above the bag hot cutting roller, and a bag hot cutting knife driving member for moving the bag hot cutting knife downward and cutting off the folded film located on the bag hot cutting roller;

[0011] a bag pressing mechanism, comprising a bag pressing roller located above the bag carrying conveyor belt and a bag pressing roller driving member for moving the bag pressing roller downward and pressing the bag pressing roller against the folding film; and

[0012] A bag wheel driving mechanism, comprising a bag driving wheel, a first bag driven wheel coaxially fixed to the bag hot cutting roller shaft, a second bag driven wheel coaxially fixed to the bag carrying main roller shaft, a bag timing belt and a bag wheel driving member for rotating the bag driving wheel;

[0013] The diameter of the bag carrying main roller is larger than the diameter of the bag hot cutting roller.

[0014] Furthermore, the film-drawing mechanism comprises a main film-drawing roller, a secondary film-drawing roller and a film-drawing driving assembly for rotating the main film-drawing roller, and a film-drawing clamping space for moving the folding film is defined between the main film-drawing roller and the secondary film-drawing roller.

[0015] Furthermore, the film-drawing slave roller is supported on the bag-forming frame in a liftable manner and is located above the film-drawing main roller.

[0016] Furthermore, the film pulling device includes an upper guide assembly and a lower guide assembly; the upper guide assembly includes an upper guide fixing block fixed on the bag forming frame and a plurality of upper guide sheets installed on the upper guide fixing block and arranged at intervals along the axial direction of the film pulling roller shaft, and the upper guide sheets are passed through the film pulling roller shaft; the lower guide assembly includes a lower guide fixing block fixed on the bag forming frame and a plurality of lower guide sheets installed on the lower guide fixing block and arranged at intervals along the axial direction of the film pulling main roller shaft, and the lower guide sheets are passed through the film pulling main roller shaft; the film guiding channel is formed between the upper guide sheets and the lower guide sheets.

[0017] Furthermore, the plurality of upper guide plates and the plurality of lower guide plates are aligned and arranged in a one-to-one correspondence.

[0018] Furthermore, a film guiding roller group is arranged between the film roll carrying device and the film pulling device to guide the movement of the folded film, and the film guiding roller group includes a plurality of first guiding rollers fixed on the bag forming frame.

[0019] Furthermore, the film guiding roller group further includes at least one second guiding roller, and the second guiding roller is movably arranged on the bag forming frame.

[0020] Furthermore, the film roll carrying device includes a film shaft supported on the bag forming frame and used to place the folded film roll, and a film shaft driving assembly for rotating the film shaft.

[0021] Furthermore, the bag carrying mechanism comprises a bag carrying tensioning shaft, and the bag carrying tensioning shaft is supported on the bag forming frame in a liftable manner.

[0022] The present invention provides a packaging bag forming method, which uses the above packaging bag forming device and comprises the following steps:

[0023] The film pulling device moves the folded film onto the bag carrying mechanism of the bag separating device;

[0024] After the folded film on the bag transport mechanism reaches a predetermined length, the bag hot cutting knife and the bag pressing roller simultaneously move downward to hot cut the folded film;

[0025] The bag hot cutting knife moves upward and resets;

[0026] The bag pressing roller and the bag carrying conveyor clamp the folded film and separate the folded film to form a packaging bag. The bag pressing roller is reset on the bag hot cutter and then moves up and reset after a preset time delay.

[0027] Compared with the prior art, the packaging bag forming device provided by the present invention includes a bag forming frame, a film roll carrying device, a film pulling device and a bag separation device. The bag separation device includes a bag carrying mechanism, a bag hot cutting mechanism, a bag pressing mechanism and a bag wheel driving mechanism. In this way, production efficiency and capacity are improved, labor costs are saved, and production costs are reduced.

[0028] Compared with the prior art, the packaging bag forming method provided by the present invention adopts the above-mentioned packaging bag forming device, which has high production efficiency and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a three-dimensional schematic diagram of a packaging bag forming device provided by an embodiment of the present invention Figure 1 ;

[0030] Figure 2 is a three-dimensional schematic diagram of a packaging bag forming device provided by an embodiment of the present invention Figure 2 ;

[0031] Figure 3 is a three-dimensional schematic diagram of a packaging bag forming device provided by an embodiment of the present invention with bag forming side plates omitted;

[0032] Figure 4 is a three-dimensional schematic diagram of the packaging bag forming device provided by an embodiment of the present invention, omitting the bag wheel driving mechanism;

[0033] Figure 5 is a front view schematic diagram of the packaging bag forming device provided by an embodiment of the present invention, omitting the bag wheel driving mechanism;

[0034] Figure 6 for Figure 5 Enlarged view of part A in the middle;

[0035] Figure 7 It is a cross-sectional schematic diagram of a folding membrane provided in an embodiment of the present invention.

[0036] Main component symbols

[0037] 100: Packaging bag forming device

[0038] 110: Bag forming frame 111: Bag forming side panel

[0039] 112: Load-bearing top plate

[0040] 120: Film roll carrying device 121: Film shaft

[0041] 122: Film shaft drive assembly

[0042] 130: Film pulling device

[0043] 131: Film pulling mechanism 1311: Film pulling main roller

[0044] 1312: film pulling from roller 1313: film pulling drive assembly

[0045] 131a: Membrane clamping space

[0046] 132: Membrane guided channel

[0047] 133: Upper guide assembly 1331: Upper guide fixing block

[0048] 1332: Upper guide plate

[0049] 134: Lower guide assembly 1341: Lower guide fixing block

[0050] 1342: Lower guide plate

[0051] 140: Bag separation device

[0052] 141: Bag transport mechanism 1411: Bag transport main roller

[0053] 1412: Bag carrying from roller 1413: Bag carrying conveyor belt

[0054] 1414: Bag carrier tensioning shaft

[0055] 142: Bag hot cutting mechanism 1421: Bag hot cutting roller

[0056] 1422: Bag hot cutter 1423: Bag hot cutter drive

[0057] 143: Bag pressing mechanism 1431: Bag pressing roller

[0058] 1432: Bag pressing roller drive

[0059] 144: Bag wheel driving mechanism 1441: Bag driving wheel

[0060] 1442: driven wheel of the first bag 1443: driven wheel of the second bag

[0061] 1444: Bag timing belt 1445: Bag wheel drive

[0062] 150: Film guide roller group 151: First guide roller

[0063] 152: Second guide roller

[0064] 1a: Packaging bag 1b: Folding film roll

[0065] 1c: Folded film 1d: Folded edge

[0066] 1e: Open edge 1f: First half

[0067] 1g: second half DETAILED DESCRIPTION

[0068] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] In order to enable those skilled in the art to better understand the technical solution of the present invention, the implementation of the present invention is described in detail below with reference to specific drawings.

[0070] For the convenience of description, the terms “front”, “rear”, “left”, “right”, “up” and “down” mentioned below are consistent with the front, rear, left, right, up and down directions of the drawings themselves, but do not limit the structure of the present invention.

[0071] Unless otherwise defined, the technical or scientific terms used herein shall have the common meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the patent application specification and claims of the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but indicate the existence of at least one.

[0072] like Figures 1 to 7 As shown, it is a preferred embodiment provided by the present invention.

[0073] The packaging bag forming device 100 provided in this embodiment includes a bag forming frame 110 and a film roll carrying device 120 supported on the bag forming frame 110 for installing a folding film roll 1b, a film pulling device 130 and a bag separating device 140; the film pulling device 130 includes a film pulling mechanism 131 for moving the folding film 1c and a film guiding channel 132 for the folding film 1c to pass through and guide the movement of the folding film 1c; the bag separating device 140 includes a bag carrying mechanism 141, a bag hot cutting mechanism 142, a bag pressing mechanism 143 and a bag wheel driving mechanism 144; the bag carrying mechanism 141 is located at the exit of the film guiding channel 132, and the bag carrying mechanism 141 includes a bag carrying main roller 1411 and a bag carrying secondary roller 1412 arranged in sequence in the moving direction of the folding film 1c, and a bag carrying conveyor belt 1413 wrapped therebetween and used to place the folding film 1c; the bag hot cutting mechanism 142 includes a bag carrying main roller 1411 and a bag carrying secondary roller 1412 arranged in sequence in the moving direction of the folding film 1c The bag pressing mechanism 143 includes a bag pressing roller 1431 located above the bag carrying conveyor belt 1413 and a bag pressing roller 1431 for moving the bag pressing roller 1431 downward and pressing the bag pressing roller 1431 against the folded film 1c. 1c, the bag pressing roller driving member 1432; the bag wheel driving mechanism 144 includes a bag driving wheel 1441, a first bag driven wheel 1442 fixed coaxially with the bag hot cutting roller 1421, a second bag driven wheel 1443 fixed coaxially with the bag carrying main roller 1411, a bag synchronous belt 1444 and a bag wheel driving member 1445 for rotating the bag driving wheel 1441; wherein, the diameter of the bag carrying main roller 1411 is larger than the diameter of the bag hot cutting roller 1421.

[0074] The above-mentioned packaging bag forming device 100 includes a bag forming frame 110, a film roll carrying device 120, a film pulling device 130 and a bag separation device 140. The bag separation device 140 includes a bag transport mechanism 141, a bag hot cutting mechanism 142, a bag pressing mechanism 143 and a bag wheel driving mechanism 144. In this way, production efficiency and production capacity are improved, labor costs are saved, and production costs are reduced.

[0075] See also Figures 1 to 7 The packaging bag forming device 100 of this embodiment includes a bag forming frame 110, a film pulling device 130 and a bag separating device 140. The film pulling device 130 and the bag separating device 140 are installed on the bag forming frame 110 and supported by the bag forming frame 110.

[0076] like Figure 1As shown, the bag forming frame 110 includes two bag forming side panels 111 parallel to each other, the film roll carrying device 120 is installed at the bottom of the rear side (left side in the figure) of the bag forming side panel 111, the bag separation device 140 is located at the front side (right side in the figure) of the bag forming side panel 111, and the film pulling device 130 is installed in the middle of the bag forming side panel 111.

[0077] See also Figure 1 , 2 and 7, a film roll carrying device 120, for mounting a folded film roll 1b, which is formed by winding a folded film roll 1c. In this embodiment, a folded film 1c is formed by folding a flat film roughly in half, and includes a folded edge 1d, an open edge 1e, a first half 1f and a second half 1g.

[0078] In this embodiment, the film roll carrying device 120 includes a film shaft 121 supported on the bag forming frame 110 and used to place the folded film roll 1b, and a film shaft driving assembly 122 for rotating the film shaft 121. The film shaft driving assembly is but not limited to a motor pulley driving assembly.

[0079] See also Figures 1 to 6 In this embodiment, a film guiding roller group 150 is arranged between the film roll carrying device 120 and the film pulling device 130 to guide the movement of the folded film 1c. The film guiding roller group 150 includes a plurality of first guiding rollers 151 fixed on the bag forming frame 110. The plurality of first guiding rollers 151 are arranged on the bag forming side plate 111 in an up-and-down staggered manner.

[0080] See also Figures 1 to 6 The film guide roller group 150 further includes at least one second guide roller 152, which is escalably mounted on the bag forming frame 110. In this embodiment, the number of the second guide rollers 152 is but not limited to one, and both ends of the second guide rollers 152 are escalably mounted on the bag forming frame 110 via sliders.

[0081] See also Figures 3 to 6 The film pulling device 130 includes a film pulling mechanism 131 for moving the folding film 1c and a film guiding channel 132 for allowing the folding film 1c to pass through and guiding the movement of the folding film 1c.

[0082] See also Figures 3 to 6In this embodiment, the film-drawing mechanism 131 includes a main film-drawing roller 1311, a secondary film-drawing roller 1312, and a film-drawing driving assembly 1313 for rotating the main film-drawing roller 1311. A film clamping space 131a for the folding film 1c to move is defined between the main film-drawing roller 1311 and the secondary film-drawing roller 1312. The film-drawing driving assembly 1313 is but not limited to a motor pulley driving assembly. The main film-drawing roller 1311 and the secondary film-drawing roller 1312 are arranged in parallel, the main film-drawing roller 1311 is located below the secondary film-drawing roller 1312, and the two are against each other. It is easy to understand that, due to the thin thickness of the folding film 1c, the side walls of the main film-drawing roller 1311 and the secondary film-drawing roller 1312 are pressed against each other, so that the folding film 1c can be clamped from the upper and lower surfaces, and under the drive of the film-drawing driving assembly 1313, the folding film 1c is pulled to the right (to the right in the figure) to move.

[0083] See also Figures 3 to 6 In this embodiment, a load-bearing top plate 112 is installed on the top of the bag forming frame 110, and the film-drawing slave roller 1312 can be raised and lowered and supported on the load-bearing top plate 112. In this way, the distance between the film-drawing slave roller 1312 and the film-drawing main roller 1311 can be adjusted by moving the film-drawing slave roller 1312 up and down to ensure that the film-drawing main roller 1311 and the film-drawing slave roller 1312 can effectively clamp the folding film 1c.

[0084] See also Figures 3 to 6 In this embodiment, the film pulling device 130 includes an upper guide assembly 133 and a lower guide assembly 134; the upper guide assembly 133 includes an upper guide fixing block 1331 fixed on the bag forming frame 110 and a plurality of upper guide sheets 1332 installed on the upper guide fixing block 1331 and arranged at intervals along the axial direction of the film pulling roller shaft 1312, and the upper guide sheets 1332 are penetrated through the film pulling roller shaft 1312; the lower guide assembly 134 includes a lower guide fixing block 1341 fixed on the bag forming frame 110 and a plurality of lower guide sheets 1342 installed on the lower guide fixing block 1341 and arranged at intervals along the axial direction of the film pulling main roller shaft 1311, and the lower guide sheets 1342 are penetrated through the film pulling main roller shaft 1311; a film guiding channel 132 is formed between the upper guide sheets 1332 and the lower guide sheets 1342.

[0085] Specifically, a plurality of upper guide pieces 1332 and a plurality of lower guide pieces 1342 are aligned and arranged one by one. A plurality of annular grooves are formed on the film-drawing roller 1312 for the upper guide pieces 1332 to pass through and respectively correspond to the upper guide pieces 1332, and the plurality of annular grooves are arranged at intervals along the axial direction of the film-drawing roller 1312; a plurality of annular grooves are formed on the film-drawing main roller 1311 for the lower guide pieces 1342 to pass through and respectively correspond to the lower guide pieces 1342, and the plurality of annular grooves are arranged at intervals along the axial direction of the film-drawing main roller 1311. It should be noted that the film guide channel 132 defined by the upper guide pieces 1332 and the lower guide pieces 1342 has an outlet adjacent to the bag hot cutting roller 1421, so that after the folded film 1c is cut, it can still be in a horizontal state (straight state shown in the figure), and the broken part will not fall off, thereby realizing continuous feeding operation.

[0086] Please continue to see Figures 3 to 6 The bag separation device 140 includes a bag carrying mechanism 141, a bag hot cutting mechanism 142, a bag pressing mechanism 143 and a bag wheel driving mechanism 144.

[0087] In this embodiment, the bag carrying mechanism 141 is located at the exit of the film guiding channel 132, and the bag carrying mechanism 141 includes a bag carrying main roller 1411 and a bag carrying slave roller 1412 arranged in sequence in the moving direction of the folding film 1c, and a bag carrying conveyor belt 1413 wrapped therebetween and used to place the folding film 1c; when the bag carrying main roller 1411 rotates, it drives the bag carrying slave roller 1412 and the bag carrying conveyor belt 1413 to rotate, thereby moving the folding film 1c placed on the bag carrying conveyor belt 1413.

[0088] As a further optimization, the bag carrying mechanism 141 includes a bag carrying tensioning shaft 1414 , which is supported on the bag forming frame 110 in a liftable manner, so that the bag carrying conveyor belt 1413 can be tensioned by the bag carrying tensioning shaft 1414 .

[0089] In this embodiment, the bag hot cutting mechanism 142 includes a bag hot cutting roller 1421 located between the bag carrying main roller 1411 and the outlet of the film guiding channel 132, a bag hot cutting knife 1422 located above the bag hot cutting roller 1421, and a bag hot cutting knife driving member 1423 for moving the bag hot cutting knife 1422 downward and cutting off the folded film 1c located on the bag hot cutting roller 1421. During the movement of the folding film 1c, its lower surface (the lower surface shown in the figure) is supported on the bag hot cutting roller 1421, and the bag hot cutting knife 1422 cooperates with the bag hot cutting roller 1421. The bag hot cutting knife driving component 1423 is but not limited to a cylinder. The bag hot cutting knife driving component 1423 is installed on the supporting top plate 112. Under the drive of the bag hot cutting knife driving component 1423, the bag hot cutting knife 1422 is pressed down on the bag hot cutting roller 1421 to hot cut the folding film 1c located on the bag hot cutting roller 1421.

[0090] In this embodiment, the bag pressing mechanism 143 includes a bag pressing roller 1431 located above the bag carrying conveyor belt 1413 and a bag pressing roller driving member 1432 for moving the bag pressing roller 1431 downward and pressing against the folding film 1c. The bag pressing roller driving member 1432 is but not limited to a cylinder. The bag pressing roller driving member 1432 is installed on the supporting top plate 112. It should be noted that the bag pressing roller driving member 1432 controls the bag pressing roller 1431 to move downward, and the bag pressing roller 1431 is pressed on the bag carrying conveyor belt 1413, thereby clamping the folding film 1c together with the bag carrying conveyor belt 1413 to facilitate the separation of the folding film 1c after hot cutting.

[0091] In this embodiment, the bag wheel driving mechanism 144 includes a bag driving wheel 1441, a first bag driven wheel 1442 coaxially fixed with the bag hot cutting roller 1421, a second bag driven wheel 1443 coaxially fixed with the bag carrying main roller 1411, a bag synchronous belt 1444 and a bag wheel driving member 1445 for rotating the bag driving wheel 1441. The bag driving wheel 1441, the first bag driven wheel 1442 and the second bag driven wheel 1443 are all but not limited to synchronous wheels. The bag synchronous belt 1444 is wrapped around the bag driving wheel 1441, the first bag driven wheel 1442 and the second bag driven wheel 1443. The bag wheel driving member 1445 is but not limited to a motor. The diameter of the bag carrying main roller 1411 is larger than the diameter of the bag hot cutting roller 1421. It should be noted that the first bag driven wheel 1442 coaxially fixed to the bag hot cutting roller 1421 and the second bag driven wheel 1443 coaxially fixed to the bag carrying main roller 1411 rotate simultaneously under the drive of the bag wheel driving mechanism 144, and the angular velocity of the bag hot cutting roller 1421 and the bag carrying main roller 1411 are the same. Since the diameter of the bag carrying main roller 1411 is larger than the diameter of the bag hot cutting roller 1421, the bag carrying main roller 1411 is The linear speed of 11 is greater than the linear speed of the bag hot cutting roller 1421, that is, after the bag hot cutting knife 1422 hot cuts the folded film 1c, the linear speed of the bag carrying conveyor 1413 is faster than that of the bag hot cutting roller 1421, so that the folded film 1c that has been hot cut can be quickly torn to the right (right direction in the figure) to separate the folded film 1c; in addition, after the film is hot cut, it can avoid adhesion between the cut part and the main body, ensuring the neatness of the incision position.

[0092] See also Figures 1 to 7 The packaging bag 1a forming method provided in this embodiment adopts the above-mentioned packaging bag forming device 100, which includes the following steps: the film pulling device 130 moves the folding film 1c to the bag carrying mechanism 141 of the bag separation device 140; after the folding film 1c on the bag carrying mechanism 141 reaches a predetermined length, the bag hot cutting knife 1422 and the bag pressing roller 1431 move downward at the same time to hot cut the folding film 1c; the bag hot cutting knife 1422 moves up and resets; the bag pressing roller 1431 and the bag carrying conveyor belt 1413 clamp the folding film 1c and separate the folding film 1c to form the packaging bag 1a, and the bag pressing roller 1431 moves up and resets after resetting on the bag hot cutting knife 1422 for a preset time, and the preset time is generally but not limited to 1 to 2 seconds. It should be pointed out that the folding film 1c cut off after the initial hot cutting is discarded, and after the initial hot cutting, the head end of the folding film 1c is sealed by the bag hot cutting knife 1422. When hot cutting again, the bag hot cutting knife 1422 will seal the tail end of the folding film 1c and the head end of the remaining folding film 1c at the same time.

[0093] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A packaging bag forming device, characterized in that: It comprises a bag forming frame and the following device supported on the bag forming frame: A film roll bearing device, used for mounting a folded film roll, wherein the folded film roll is formed by winding a folded film; A film pulling device, comprising a film pulling mechanism for moving the folded film and a film guiding channel for allowing the folded film to pass through and guiding the movement of the folded film; and A bag separation device comprising: A bag carrying mechanism, located at the exit of the film guiding channel, the bag carrying mechanism comprising a bag carrying main roller and a bag carrying slave roller arranged in sequence in the moving direction of the folded film, and a bag carrying conveyor belt wrapped therebetween and used for placing the folded film; a bag hot cutting mechanism, comprising a bag hot cutting roller located between the bag carrying main roller and the outlet of the film guiding channel, a bag hot cutting knife located above the bag hot cutting roller, and a bag hot cutting knife driving member for moving the bag hot cutting knife downward and cutting off the folded film located on the bag hot cutting roller; a bag pressing mechanism, comprising a bag pressing roller located above the bag carrying conveyor belt and a bag pressing roller driving member for moving the bag pressing roller downward and pressing the bag pressing roller against the folding film; and A bag wheel driving mechanism, comprising a bag driving wheel, a first bag driven wheel coaxially fixed to the bag hot cutting roller, a second bag driven wheel coaxially fixed to the bag carrying main roller, a bag timing belt and a bag wheel driving member for rotating the bag driving wheel; the bag timing belt wraps around the bag driving wheel, the first bag driven wheel and the second bag driven wheel, and the angular velocity of the bag hot cutting roller and the bag carrying main roller are the same; The diameter of the bag carrying main roller is larger than the diameter of the bag hot cutting roller.

2. The packaging bag forming device according to claim 1, characterized in that: The film-drawing mechanism comprises a main film-drawing roller, a secondary film-drawing roller and a film-drawing driving assembly for rotating the main film-drawing roller. A film-holding space for the folding film to move is defined between the main film-drawing roller and the secondary film-drawing roller.

3. The packaging bag forming device according to claim 2, characterized in that: The film-drawing slave roller is supported on the bag-forming frame in a liftable manner and is located above the film-drawing main roller.

4. The packaging bag forming device according to claim 2, characterized in that: The film pulling device includes an upper guide assembly and a lower guide assembly; the upper guide assembly includes an upper guide fixing block fixed on the bag forming frame and a plurality of upper guide sheets installed on the upper guide fixing block and arranged at intervals along the axial direction of the film-pulling roller shaft, and the upper guide sheets are passed through the film-pulling roller shaft; the lower guide assembly includes a lower guide fixing block fixed on the bag forming frame and a plurality of lower guide sheets installed on the lower guide fixing block and arranged at intervals along the axial direction of the film-pulling main roller shaft, and the lower guide sheets are passed through the film-pulling main roller shaft; the film guiding channel is formed between the upper guide sheets and the lower guide sheets.

5. The packaging bag forming device according to claim 4, characterized in that: The plurality of upper guide pieces and the plurality of lower guide pieces are aligned and arranged in a one-to-one correspondence.

6. The packaging bag forming device according to any one of claims 1 to 5, characterized in that: A film guiding roller group is arranged between the film roll carrying device and the film pulling device to guide the movement of the folded film. The film guiding roller group includes a plurality of first guiding rollers fixed on the bag forming frame.

7. The packaging bag forming device according to claim 6, characterized in that: The film guiding roller group further includes at least one second guiding roller, and the second guiding roller is arranged on the bag forming frame in a liftable manner.

8. The packaging bag forming device according to any one of claims 1 to 5, characterized in that: The film roll carrying device comprises a film shaft supported on the bag forming frame and used for placing the folded film roll, and a film shaft driving assembly for rotating the film shaft.

9. The packaging bag forming device according to any one of claims 1 to 5, characterized in that: The bag carrying mechanism comprises a bag carrying tensioning shaft, and the bag carrying tensioning shaft is supported on the bag forming frame in a liftable manner.

10. A packaging bag forming method, using the packaging bag forming device according to any one of claims 1 to 9, characterized in that: The following steps are involved: The film pulling device moves the folded film onto the bag carrying mechanism of the bag separating device; After the folded film on the bag transport mechanism reaches a predetermined length, the bag hot cutting knife and the bag pressing roller simultaneously move downward to hot cut the folded film; The bag hot cutting knife moves upward and resets; The bag pressing roller and the bag carrying conveyor clamp the folded film and separate the folded film to form a packaging bag. The bag pressing roller is reset on the bag hot cutter and then moves up and reset after a preset time delay.

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