Paper bag opening folding device

Abstract

The utility model discloses a paper bag opening folding device which comprises a conveying component, and the conveying component conveys a paper bag to sequentially pass through a glue spraying area, an edge folding and bending area and an edge folding and attaching area in the second direction. The conveying component conveys the paper bags in sequence in the second direction, and when the paper bags pass through a glue spraying area, two paired glue spraying heads on the glue spraying component can spray glue to the inner surfaces of bag openings of the second side faces of the paper bags; bag opening folded edges on the side faces of the paper bag entering the edge folding and bending area are extruded by a first downward pressing assembly and a second downward pressing assembly of the edge folding and bending part, so that the bag opening folded edges on the side faces are bent towards the inner side of the paper bag and are kept in a bent state; the bag opening of the paper bag entering the edge folding and attaching area is pushed by two inserting plates of an edge folding and folding part to be folded in a bent state, so that the bag opening folded edge is folded along a folding mark and attached to the inner surface of the second side face, the inner surface of the bag opening folded edge and the inner surface of the second side face can be bonded together, and inward folding and fixing of the bag opening of the paper bag are completed.

Description

Technical Field

[0001] The utility model relates to the technical field of packaging bag production machinery, in particular to a paper bag folding device. Background Art

[0002] The hemming of the paper bag mouth is an important link in the paper bag manufacturing process. It can not only increase the beauty of the paper bag, but also improve the practicality and durability of the paper bag. Specifically, the mouth of the paper bag after hemming treatment is more firm and not easy to deform, and can better maintain the shape of the paper bag. Moreover, through the hemming treatment, the mouth part of the paper bag is strengthened, thereby improving the load-bearing capacity of the paper bag. In addition, hemming can make the edge of the paper bag mouth more neat and beautiful, enhancing the overall visual effect. However, the process of folding and wrapping the inner mouth of the bag is complex. In the traditional production process, the process of folding and gluing the inner mouth of the bag is still completed manually, resulting in high labor costs and low production efficiency.

[0003] In the prior art, a Chinese patent (publication number CN117922095A) discloses a paper bag wrapping machine and its bag mouth wrapping process flow. This paper bag wrapping machine includes a conveying device, and a bag mouth outfolding device, a front and back surface glue spraying device for the bag mouth, a bag mouth inner folding device, and a bag mouth flattening device are sequentially arranged on the conveying device, so as to realize the processes of bag mouth outfolding, then glue spraying, then inner folding of the front and back surfaces of the bag mouth, inner folding of both sides of the bag mouth, and then turning down and flattening the bag mouth to achieve the automated bag wrapping process.

[0004] In order to apply glue, this kind of edge wrapping machine needs to first outfold the bag mouth and spray glue on the front and back surfaces of the bag mouth, and then refold the bag mouth. During this period, the folding edge of the edge wrapping machine repeatedly acts on the folding edge of the bag mouth, with a great risk of damaging the folding edge, making the folding edge unable to play a good strengthening role on the bag mouth. More seriously, the folding edge may be torn off, resulting in the paper bag becoming a waste product and reducing the yield of the paper bag. Content of the Utility Model

[0005] The purpose of the utility model is to solve the technical problem that in the prior art, in order to apply glue, the edge wrapping machine needs to first outfold the bag mouth and spray glue on the front and back surfaces of the bag mouth, and then refold the bag mouth. During this period, the folding edge device of the edge wrapping machine repeatedly acts on the folding edge of the bag mouth, with a great risk of damaging the folding edge, making the folding edge unable to play a good strengthening role on the bag mouth. More seriously, the folding edge may be torn off, resulting in the paper bag becoming a waste product and reducing the yield of the paper bag.

[0006] To solve the above technical problems, an embodiment of the present utility model discloses a paper bag folding device. The paper bag includes a bottom surface, a pair of first side surfaces extending in a first direction and arranged opposite to each other, and a pair of second side surfaces extending in a second direction and arranged opposite to each other. The open ends of the first side surfaces and the second side surfaces are both formed with bag mouth flanges, and creases are formed between each first side surface and the second side surface and their respective bag mouth flanges. The first direction and the second direction are perpendicular to each other and both parallel to the bottom surface.

[0007] The paper bag folding device includes a transportation component that transports the paper bag in the second direction and passes through a glue spraying area, a flange bending area, and a flange fitting area in sequence.

[0008] Among them, a glue spraying component is arranged in the glue spraying area. The glue spraying component includes a pair of glue spraying heads arranged in pairs corresponding to a pair of second side surfaces respectively. Each pair of glue spraying heads opens towards the inner surfaces of the bag mouth flanges of a pair of second side surfaces of the paper bag.

[0009] A flange bending component is arranged in the flange bending area. The flange bending component includes a first pressing component and a second pressing component located above the transportation component. The first pressing component and the second pressing component respectively squeeze the corresponding bag mouth flanges from the outer surfaces of the bag mouth flanges of the first side surface and the second side surface, so that the bag mouth flanges are bent towards the inner side of the paper bag along the creases and maintain the bent state.

[0010] A flange folding component is arranged in the flange fitting area. The flange folding component includes at least an inserting plate corresponding to a pair of second side surfaces. The inserting plate can be inserted into the paper bag in a direction perpendicular to the bottom surface and push the bent bag mouth flanges, so that the bag mouth flanges are folded along the creases and fit on the inner surface of the second side surface.

[0011] With the above technical solution, during the use of this paper bag folding device, the transportation component transports the paper bags in sequence along the second direction. When the paper bag passes through the glue spraying area, the two glue spraying heads on the glue spraying component will spray glue on the inner surface of the bag opening on the second side of the paper bag, completing the glue spraying step. Further, under the transportation action of the transportation component, the paper bag enters the edge folding and bending area. The first pressing component of the edge folding and bending component presses the bag opening edge of the first side, causing the bag opening edge of the first side to bend towards the inside of the paper bag and maintain the bent state. The second pressing component of the edge folding and bending component presses the bag opening edge of the second side, causing the bag opening edge of the second side to bend towards the inside of the paper bag and maintain the bent and turning state, completing the edge folding and bending step. Even further, under the transportation action of the transportation component, the paper bag enters the edge folding and fitting area. The two inserting plates of the edge folding and turning component are inserted into the paper bag along the direction perpendicular to the bottom surface, and push the bent bag opening edge, causing the bag opening edge to turn over along the crease and fit on the inner surface of the second side. At this time, since the inner surface of the bag opening edge is sprayed with glue, the inner surface of the bag opening edge and the inner surface of the second side will bond together, completing the inner folding and fixing of the bag opening of the paper bag. Compared with the edge binding machine that repeatedly folds the edge in the prior art, this paper bag folding device first bends the glued bag opening edge, and then performs inner folding through the edge folding and turning component. The bag opening edge only turns over towards the inside of the paper bag, reducing the steps of deformation of the bag opening edge, reducing the risk of damage to the bag opening edge, ensuring that the bag opening edge can play the expected strengthening role for the bag opening, and improving the yield rate of the paper bag.

[0012] In addition, this paper bag folding device does not need to be provided with components for turning the bag opening edge outwards. On the one hand, on the premise of ensuring the yield rate of the paper bag, the process steps of paper bag forming are simplified, and the process difficulty is reduced; on the other hand, the structure of the paper bag folding device is simpler, the production cost is reduced, and the space it occupies is smaller, which is more conducive to the arrangement of the paper bag folding device on the paper bag production line.

[0013] An embodiment of the present utility model also discloses a paper bag folding device, where the edges on both sides of the bag opening edge of the first side along the first direction are connected to the corresponding edges of the bag opening edges of the second sides on both sides.

[0014] Among them, the first pressing component is located upstream of the second pressing component along the second direction, and the first pressing component causes the bag opening edge of the first side to bend to the lower side where the second pressing component causes the bag opening edge of the second side to bend.

[0015] With the above technical solution, since the hem of the bag opening on the first side is connected to the hem of the bag opening on the second side, when bending the hems, the hem of the bag opening on the first side is bent to the lower side of the hem of the bag opening on the second side, and the bent hem of the bag opening on the second side can press on the hem of the bag opening on the first side. It only needs to keep the hem of the bag opening on the second side in the bent state, and the hem of the bag opening on the second side can restrict the hem of the bag opening on the first side, preventing the first side from recovering under its own restoring force, which is more conducive to keeping the hem of the bag opening in the bent state.

[0016] An embodiment of the present utility model also discloses a paper bag folding device. The first pressing component includes an upstream first bending member, a downstream first bending member, and a first bending maintaining member arranged in sequence along the second direction.

[0017] Among them, the upstream first bending member and the downstream first bending member respectively push the hems of the bag openings on the first side located upstream and downstream along the second direction, so that the hems of the bag openings are bent towards the inner side of the paper bag along the second direction.

[0018] Moreover, the first bending maintaining member has a first abutting portion that abuts against the hem of the bag opening on the first side to keep the hem of the bag opening in the bent state; in the direction perpendicular to the bottom surface, the first abutting portion is located between the crease and the upper edge of the hem of the bag opening.

[0019] With the above technical solution, the upstream first bending member of the first pressing component pushes the hem of the bag opening on the first side located upstream along the second direction, so that the hem of the bag opening is bent towards the inner side of the paper bag along the second direction. The downstream first bending member of the first pressing component pushes the hem of the bag opening on the first side located downstream along the second direction, so that the hem of the bag opening is bent towards the inner side of the paper bag along the second direction, thereby ensuring that the hems of the bag openings on the first side perpendicular to the second direction are all bent. Further, in order to prevent the hem of the bag opening from resetting, the hem of the bag opening on the first side is kept in the bent state through the first abutting portion on the first bending maintaining member, reducing the risk of the hem of the bag opening on the first side from resetting.

[0020] An embodiment of the present utility model also discloses a paper bag folding device. The first pressing component further includes a pressing driving member, and the upstream first bending member is arranged as a lower pressing plate, and the pressing driving member is in transmission connection with the lower pressing plate.

[0021] Among them, the pressing driving member drives the lower pressing plate to swing around the first direction, so that the lower pressing plate abuts against the outer surface of the hem of the bag opening on the first side of the paper bag located upstream and pushes the hem of the bag opening to bend towards the inside of the paper bag along the second direction.

[0022] With the above technical solution, the pressing driving member drives the lower pressing plate to swing around the first direction, pushing the hem of the bag opening on the first side located upstream to bend.

[0023] An embodiment of the present utility model also discloses a paper bag folding device. The first pressing component further includes a pressing base plate, and both the pressing driving member and the pressing plate are mounted on the pressing base plate.

[0024] Wherein, the pressing plate is hinged to the pressing base plate. The pressing driving member is set as a driving cylinder, and the output end of the driving cylinder is connected to the pressing plate offset relative to the hinge point between the pressing plate and the pressing base plate, and drives the pressing plate to swing around the hinge point.

[0025] Moreover, the first pressing component further includes a pressing mounting plate and a height adjusting member. The height adjusting member is disposed between the pressing mounting plate and the pressing base plate, and drives the pressing base plate to move relative to the pressing mounting plate in a direction perpendicular to the bottom surface.

[0026] With the above technical solution, the output end of the driving cylinder is connected to the pressing plate offset relative to the hinge point between the pressing plate and the pressing base plate, thereby converting the linear motion output by the driving cylinder into the swinging of the pressing plate around the hinge point, so as to realize the steps of the pressing plate pushing the bag mouth hem to bend and reset, enabling the pressing plate to push the bag mouth hems of multiple paper bags upstream in sequence.

[0027] Moreover, the height adjusting member can drive the pressing base plate to move relative to the pressing mounting plate in a direction perpendicular to the bottom surface, ensuring that when the pressing plate is in the initial position, the lower edge of the pressing plate is on the side away from the bottom surface of the bag mouth hem on the first side in the direction perpendicular to the bottom surface, so that the pressing plate can realize the bending effect on different bag mouth hems or the hems of different paper bags.

[0028] An embodiment of the present utility model also discloses a paper bag folding device. The downstream first bending member extends curvedly in the second direction from the upstream side along the direction close to the bottom surface until it is flush with the crease on the first side.

[0029] With the above technical solution, the downstream first bending member extends curvedly in the second direction from the upstream side along the direction close to the bottom surface. When the transportation component transports the paper bag in the second direction, the downstream first bending member can smoothly press on the first side located downstream, and then the paper bag is transported in the second direction and gradually bends along the direction close to the inner side of the paper bag.

[0030] Moreover, since the downstream first bending member extends curvedly in the second direction, the downstream first bending member acts on the bag mouth hem on the first side in a surface contact manner, avoiding the driving force acting on the bag mouth hem on the first side being too concentrated during the process of pushing the bag mouth hem to bend, and reducing the risk of damage during the bending process of the bag mouth hem.

[0031] An embodiment of the present utility model also discloses a paper bag folding device. The first bending maintaining member extends in the second direction, and the lower surface of the first bending maintaining member is flush with the crease on the first side surface to form a first abutting portion.

[0032] Moreover, the upstream end of the first bending maintaining member is smoothly connected to the downstream end of the downstream first bending member.

[0033] With the above technical solution, the upstream end of the first bending maintaining member is smoothly connected to the downstream end of the downstream first bending member. The bag mouth folded edge that is pushed by the downstream first bending member to bend can be immediately abutted by the first bending maintaining member, avoiding the return of the bag mouth folded edge on the first side surface.

[0034] Moreover, the lower surface of the first bending maintaining member is flush with the crease on the first side surface to form a first abutting portion, enabling the bag mouth folded edge on the first side surface to be bent to a position flush with the crease, which is beneficial for being squeezed and attached to the inner surface of the first side surface in the bending and attaching area.

[0035] An embodiment of the present utility model also discloses a paper bag folding device. The downstream first bending member and the first bending maintaining member are formed into a rod-shaped structure. In the first direction, the downstream first bending member and the first bending maintaining member are located in the middle of the first side surface.

[0036] Moreover, in the second direction, the lower pressing plate is formed with an avoidance groove at a position corresponding to the downstream first bending member.

[0037] With the above technical solution, the rod-shaped downstream first bending member and the first bending maintaining member are located in the middle of the first side surface, making the force-bearing surface of the bag mouth folded edge on the first side surface of the downstream first bending member and the first bending maintaining member perpendicular to the crease of the bag mouth folded edge on the second side surface. The bag mouth folded edge on the second side surface can be bent as a whole around the crease in the second direction.

[0038] Moreover, the lower pressing plate is provided with an avoidance groove, enabling the upstream end portion of the downstream first bending member to extend to a relatively upstream position, so that after the lower pressing plate pushes the bag mouth folded edge on the upstream first side surface to bend, the downstream first bending member will also contact the outer surface of the bag mouth folded edge on the upstream first side surface, avoiding the reset of the bag mouth folded edge after it separates from the lower pressing plate.

[0039] An embodiment of the present utility model also discloses a paper bag folding device. The second downward pressing assembly includes two groups of second bending members and second bending maintaining members that correspond to a pair of second side surfaces and are arranged in sequence in the second direction. The two second bending members and second bending maintaining members are respectively arranged on both sides of the first bending maintaining member in the first direction and are symmetrically arranged with respect to the axis of the first bending maintaining member.

[0040] Among them, the second bending member extends in the second direction, from the upstream part located outside the corresponding second side surface, along the inner side close to the second side surface and close to the bottom surface in a curved manner until it is flush with the crease on the second side surface.

[0041] The second bending maintaining member extends in the second direction, and the lower surface of the second bending maintaining member is flush with the crease on the second side surface to form the second abutting portion.

[0042] Moreover, the upstream end of the second bending maintaining member is smoothly connected to the downstream end of the second bending member.

[0043] Adopting the above technical solution, the two second bending members and the second bending maintaining member are respectively arranged on both sides of the first bending maintaining member along the first direction and are symmetrically arranged with respect to the axis of the first bending maintaining member, which can make the second side surfaces on both sides of the first direction symmetrically fold inward, ensuring that the bending degrees of the second side surfaces on both sides are the same.

[0044] Furthermore, because the upstream end of the second bending maintaining member is smoothly connected to the downstream end of the second bending member, the bag mouth hem that is bent by the extrusion of the second bending member can be immediately abutted by the second bending maintaining member, preventing the bag mouth hem on the second side surface from recovering.

[0045] In addition, the lower surface of the second bending maintaining member is flush with the crease on the second side surface to form the first abutting portion, enabling the bag mouth hem of the second side surface to be bent to a position flush with the crease, which is conducive to being pressed and adhered to the inner surface of the second side surface by the inserting plate in the bending and adhering area.

[0046] The embodiment of the present utility model also discloses a paper bag folding device. The hem folding component further includes an inserting plate base corresponding to the inserting plate and a lower inserting driving member arranged on the inserting plate base and drivingly connected to the inserting plate. The lower inserting driving member drives the inserting plate to move in a direction perpendicular to the bottom surface.

[0047] The hem folding component further includes a following component arranged on the inserting plate base. The following component drives the inserting plate base and the inserting plate to move along the second direction in the hem adhering area as the paper bag on the transporting component moves.

[0048] Adopting the above technical solution, the lower inserting driving member drives the inserting plate to move in a direction perpendicular to the bottom surface, so that the lower edge of the inserting plate abuts against the outer surface of the bag mouth hem of the second side surface and further bends towards the inside of the paper bag.

[0049] Moreover, because a following component is arranged on the inserting plate base, it can drive the base and the inserting plate to move as the paper bag on the transporting component moves, and complete the folding of the bag mouth hem during the movement of the paper bag, improving the production efficiency.

[0050] The embodiment of the utility model also discloses a paper bag folding device, wherein the edge folding component also includes a guide component arranged between the plug plate base and the plug plate, the guide component can move relative to the plug plate base in a direction perpendicular to the bottom surface, and the guide component is fixedly connected to the plug plate.

[0051] By adopting the above technical solution, a guide component is set between the plug base and the plug to ensure that the moving direction of the plug is always perpendicular to the direction of the bottom surface, ensuring that the bag opening folded edge pushed by the plug can fit tightly against the inner surface of the side of the paper bag.

[0052] The embodiment of the utility model further discloses a paper bag folding device, wherein the edge folding component further comprises a lower inserting transmission member arranged between the lower inserting driving member and the inserting plate.

[0053] Among them, the lower plug-in drive member is configured as a rotating motor, and the lower plug-in transmission member includes a transmission disk and a linkage rod. The transmission disk is arranged at the output end of the rotating motor and connected to the output end of the rotating motor. One end of the linkage rod is eccentrically hinged to the transmission disk, and the other end is hinged to the plug plate.

[0054] By adopting the above technical solution, the power of the rotating motor is transmitted to the plug plate in sequence through the transmission disc and the linkage rod, and the rotational motion of the output end of the rotating motor is cleverly converted into linear motion in a direction perpendicular to the bottom surface.

[0055] The embodiment of the utility model also discloses a paper bag folding device, in which the width of the inserting plate in the second direction is matched with the width of the second side surface, and the two side edges of the inserting plate in the second direction are bent inwardly along the first direction to form folding plates matched with the first side surfaces on both sides.

[0056] By adopting the above technical solution, the width of the insert plate is matched with the width of the second side surface, ensuring that when the insert plate is inserted into the paper bag, the bag opening fold can be evenly pressed against the inner surface of the second side surface in the second direction.

[0057] In addition, the first direction is bent inwardly to form a folded plate adapted to the first side surfaces on both sides, and at the same time, the bag opening folded edge of the first side surface can be squeezed onto the inner surface of the first side surface.

[0058] An embodiment of the utility model also discloses a paper bag folding device, wherein the glue spraying component includes two glue gun seats arranged at intervals along the second direction, respectively corresponding to the second side surfaces on both sides; in the first direction, the two glue gun seats are arranged between a pair of second side surfaces, located in the middle position; in a direction perpendicular to the bottom surface, the glue gun seats are located on the side of the upper edge of the bag folding edge away from the paper bag.

[0059] Among them, the glue spraying head of the glue gun seat is inclined towards the corresponding bag mouth hem with respect to the direction perpendicular to the bottom surface, and the angle of inclination of the glue spraying head with respect to the direction perpendicular to the bottom surface is within the range of 30° to 75°.

[0060] With the above technical solution, the glue spraying head sprays glue obliquely with respect to the direction perpendicular to the bottom surface, so that the glue is more evenly distributed on the inner surface of the bag mouth hem, avoiding the situation of missed coating or uneven coating, thereby improving the bonding firmness between the bag mouth hem and the inner surface of the side.

[0061] The embodiment of the present utility model also discloses a paper bag folding device. The glue strip formed by spraying the glue head towards the inner surface of the opposite bag mouth hem has a distance from the crease within the range of 10 mm to 20 mm in the direction perpendicular to the bottom surface.

[0062] With the above technical solution, the glue strip formed by spraying the glue head towards the inner surface of the opposite bag mouth hem has a distance from the crease within the range of 10 mm to 20 mm in the direction perpendicular to the bottom surface. When the bag mouth hem is folded and attached to the inner surface of the side, the glue strip will be squeezed and distributed on most of the inner surface of the bag mouth hem, thereby ensuring to improve the bonding firmness between the bag mouth hem and the inner surface of the side.

[0063] The embodiment of the present utility model also discloses a paper bag folding device. The transportation component includes a bottom conveyor belt and a pair of side conveyor belts arranged at intervals in the first direction. In the second direction, the side conveyor belts and the pair of side conveyor belts are respectively adapted to the bottom surface and a pair of second sides of the paper bag.

[0064] Moreover, adsorption areas facing the corresponding second sides are provided on the pair of side conveyor belts.

[0065] With the above technical solution, adsorption areas facing the corresponding second sides are provided on the pair of side conveyor belts, which can provide an adsorption force to the second sides of the paper bag, so that the paper bag is always in an unfolded state during transportation. The bag mouth hem of the paper bag can accurately fit on the inner surface of the corresponding side of the paper bag under the action of the hem bending component and the hem folding component.

[0066] The embodiment of the present utility model also discloses a paper bag folding device. The adsorption area is located at the periphery of the side conveyor belt and is formed with an air suction port structure communicated with the air duct.

[0067] With the above technical solution, the air suction port structure communicated with the air duct formed in the adsorption area can provide suction force to the outer surface of the second side of the paper bag and has no contact with the second side of the paper bag, reducing the risk of damaging the paper bag.

[0068] The beneficial effects of the present utility model are:

[0069] The utility model discloses a paper bag folding device, which includes a transportation component. The transportation component transports the paper bags along the second direction and successively passes through a glue spraying area, a hem bending area, and a hem fitting area. The transportation component transports the paper bags in sequence along the second direction. When the paper bag passes through the glue spraying area, two paired glue spraying heads on the glue spraying component will spray glue on the inner surface of the bag mouth of the second side of the paper bag, completing the glue spraying step. Further, under the transportation action of the transportation component, the paper bag enters the hem bending area. The first pressing component of the hem bending component presses the hem of the bag mouth on the first side, causing the hem of the bag mouth on the first side to bend towards the inner side of the paper bag and maintain the bent state. The second pressing component of the hem bending component presses the hem of the bag mouth on the second side, causing the hem of the bag mouth on the second side to bend towards the inner side of the paper bag and maintain the bent and turned state, completing the hem bending step. Even further, under the transportation action of the transportation component, the paper bag enters the hem fitting area. Two inserting plates of the hem folding component are inserted into the paper bag in a direction perpendicular to the bottom surface, and push the bent hem of the bag mouth, causing the hem of the bag mouth to fold along the crease and fit on the inner surface of the second side. At this time, since the inner surface of the hem of the bag mouth is sprayed with glue, the inner surface of the hem of the bag mouth and the inner surface of the second side will bond together, completing the inner folding and fixing of the bag mouth of the paper bag.

[0070] Compared with the edge wrapping machine that repeatedly folds the hem in the prior art, this paper bag folding device first bends the glued bag mouth hem, and then performs inner folding through the hem folding component. The bag mouth hem only folds towards the inner side of the paper bag, reducing the steps of deformation of the bag mouth hem, reducing the risk of damage to the bag mouth hem, ensuring that the bag mouth hem can play the expected strengthening role for the bag mouth, and improving the yield rate of the paper bag. Description of the Drawings

[0071] Figure 1 Structural schematic diagram of the paper bag folding device provided for the embodiment of the utility model;

[0072] Figure 2 Top view of the paper bag folding device provided for the embodiment of the utility model;

[0073] Figure 3 Structural schematic diagram of the paper bag folding device (removing the frame) provided for the embodiment of the utility model;

[0074] Figure 4 Structural schematic diagram of the paper bag folding device (removing the frame) and the paper bag provided for the embodiment of the utility model;

[0075] Figure 5 Structural schematic diagram of the paper bag folding device (removing the frame, the hem bending component, and the hem folding component) and the paper bag provided for the embodiment of the utility model;

[0076] Figure 6Schematic diagram of the first bending member upstream of the paper bag folding device provided for the embodiment of the utility model;

[0077] Figure 7 Schematic diagram of the second pressing component of the paper bag folding device provided for the embodiment of the utility model;

[0078] Figure 8 Schematic diagram of the edge folding and turning member of the paper bag folding device provided for the embodiment of the utility model.

[0079] Description of reference numerals:

[0080] 10. Paper bag folding device;

[0081] 100. Transportation component;

[0082] 110. Side conveyor belt; 120. Bottom conveyor belt; 130. Belt motor; 140. Lifting component;

[0083] 150. Air suction port structure;

[0084] 200. Glue spraying component;

[0085] 210. Glue gun seat;

[0086] 300. Edge folding and bending component;

[0087] 310. First pressing component;

[0088] 311. First bending member upstream; 3110. Lower pressing plate; 3111. Avoidance groove;

[0089] 312. First bending member downstream; 313. First bending maintaining member;

[0090] 314. Pressing driving member; 3140. Driving cylinder; 315. Lower pressing base plate; 316. Connecting plate; 317. Height adjusting member; 3170. Height adjusting guide rail; 3171. Handle;

[0091] 320. Second pressing component;

[0092] 321. Second bending member; 322. Second bending maintaining member;

[0093] 400. Edge folding and turning member;

[0094] 410. Insertion plate; 411. Folding plate; 420. Insertion plate base; 430. Lower insertion driving member; 440. Lower insertion transmission member; 441. Transmission disc; 442. Linking rod; 450. Follow-up component; 451. Synchronous belt; 452. Follow-up motor;

[0095] 460. Guide component; 461. Guide rod;

[0096] 500, mounting table;

[0097] 510, base; 520, frame;

[0098] 20, paper bag;

[0099] 201, first side;

[0100] 202, second side;

[0101] 203, bag mouth hem;

[0102] X, first direction;

[0103] Y, second direction. Detailed implementation mode

[0104] In the existing technology, during the gluing process of the edge binding machine, it is first required to turn the bag mouth outwards so as to evenly spray glue on the front and back surfaces of the bag mouth. Subsequently, the bag mouth needs to be folded inwards again to complete the sealing. However, during this operation process, the folding device of the edge binding machine acts on the folded edge part of the bag mouth multiple times, which greatly increases the risk of damaging the folded edge. Once the folded edge is damaged, its original function of strengthening the bag mouth structure will be greatly reduced, and in extreme cases, the folded edge may even be torn, resulting in the entire paper bag becoming a waste product. This not only affects the overall quality of the paper bag but also greatly reduces the product yield.

[0105] Therefore, the present utility model provides a paper bag folding device, which includes a transportation component. The transportation component transports the paper bag along the second direction and successively passes through a glue spraying area provided with a glue spraying component, a folding edge bending area provided with a folding edge bending component, and a folding edge fitting area provided with a folding edge turning component. When the paper bag passes through the glue spraying area, two paired glue spraying heads on the glue spraying component spray glue on the inner surface of the bag mouth of the second side of the paper bag; the paper bag entering the folding edge bending area is squeezed by the first pressing component and the second pressing component of the folding edge bending component on the folded edge of the side bag mouth, so that the folded edge of the side bag mouth bends towards the inside of the paper bag and maintains the bent state; the paper bag entering the folding edge fitting area is pushed by two inserting plates of the folding edge turning component on the folded edge of the bag mouth in the bent state, so that the folded edge of the bag mouth turns over along the crease and fits on the inner surface of the second side, and the inner surface of the folded edge of the bag mouth and the inner surface of the second side are bonded together to complete the inner folding and fixing of the bag mouth of the paper bag.

[0106] To make the purpose, technical solution and advantages of the present utility model clearer, the following will further describe the implementation mode of the present utility model in detail with reference to the accompanying drawings.

[0107] Such as Figures 1 - 5As shown in the figure, an embodiment of the present utility model discloses a paper bag folding device 10. The paper bag 20 includes a bottom surface, a pair of first side surfaces 201 extending along the first direction X and arranged opposite to each other, and a pair of second side surfaces 202 extending along the second direction Y and arranged opposite to each other. The open ends of the first side surfaces 201 and the second side surfaces 202 are both formed with bag mouth flanges 203, and a crease is formed between each first side surface 201 and the second side surface 202 and its respective bag mouth flange 203. The first direction X and the second direction Y are perpendicular to each other and both parallel to the bottom surface. It should be noted that in this embodiment, the area of the first side surface 201 of the paper bag 20 is larger than that of the second side surface 202, and the distance between the pair of first side surfaces 201 is greater than the distance between the pair of second side surfaces 202, which is beneficial to the stability of transmission. Of course, regarding the structure of the paper bag 20 itself, those skilled in the art can design it according to the actual situation and specific requirements, and this embodiment does not make specific limitations on this.

[0108] The paper bag folding device 10 includes a transportation component 100, and the transportation component 100 transports the paper bag 20 along the second direction Y in sequence through a glue spraying area, a flange bending area, and a flange fitting area.

[0109] Among them, a glue spraying component 200 is arranged in the glue spraying area. The glue spraying component 200 includes a pair of glue spraying heads arranged in pairs corresponding to the pair of second side surfaces 202 respectively, and each pair of glue spraying heads opens towards the inner surface of the bag mouth flange 203 of the pair of second side surfaces 202 of the paper bag 20 respectively.

[0110] A flange bending component 300 is arranged in the flange bending area. The flange bending component 300 includes a first pressing component 310 and a second pressing component 320 located above the transportation component 100. The first pressing component 310 and the second pressing component 320 respectively squeeze the corresponding bag mouth flange 203 from the outer surface of the bag mouth flange 203 of the first side surface 201 and the second side surface 202, so that the bag mouth flange 203 bends towards the inner side of the paper bag 20 along the crease and maintains the bent state.

[0111] A flange folding component 400 is arranged in the flange fitting area. The flange folding component 400 includes at least an insertion plate 410 corresponding to the pair of second side surfaces 202. The insertion plate 410 can be inserted into the paper bag 20 along the direction perpendicular to the bottom surface, and push the bent bag mouth flange 203, so that the bag mouth flange 203 folds along the crease and fits on the inner surface of the second side surface 202.

[0112] During the use of this paper bag folding device 10, the transportation component 100 transports the paper bags 20 in sequence along the second direction Y. When the paper bag 20 passes through the glue spraying area, two glue spraying heads on the glue spraying component 200 will spray glue on the inner surface of the bag opening of the second side 202 of the paper bag 20 to complete the glue spraying step. Further, under the transportation action of the transportation component 100, the paper bag 20 enters the hemming and bending area. The first pressing component 310 of the hemming and bending component 300 presses the bag opening hem 203 of the first side 201, causing the bag opening hem 203 of the first side 201 to bend towards the inside of the paper bag 20 and maintain the bent state. The second pressing component 320 of the hemming and bending component 300 presses the bag opening hem 203 of the second side 202, causing the bag opening hem of the second side 202 to bend towards the inside of the paper bag 20 and maintain the bent and turning state to complete the hemming and bending step. Even further, under the transportation action of the transportation component 100, it enters the hemming and fitting area. The two inserting plates 410 of the hemming and folding component 400 are inserted into the paper bag 20 along the direction perpendicular to the bottom surface and push the bent bag opening hem 203, causing the bag opening hem 203 to fold along the crease and fit on the inner surface of the second side 202. At this time, since the inner surface of the bag opening hem 203 is sprayed with glue, the inner surface of the bag opening hem 203 and the inner surface of the second side 202 will be bonded together to complete the inner folding and fixation of the bag opening of the paper bag 20. Compared with the edge binding machine that repeatedly folds the hem in the prior art, this paper bag folding device 10 first bends the glued bag opening hem and then performs inner folding through the hemming and folding component 400. The bag opening hem only folds towards the inside of the paper bag 20, reducing the steps of deformation of the bag opening hem, reducing the risk of damage to the bag opening hem 203, ensuring that the bag opening hem 203 can play the expected strengthening role for the bag opening, and improving the yield rate of the paper bag 20.

[0113] Further, in an embodiment, the edges of the bag opening hem 203 of the first side 201 of the paper bag 20 along both sides in the first direction X are connected to the corresponding edges of the bag opening hem 203 of the second side 202 on both sides.

[0114] Among them, the first pressing component 310 is located upstream of the second pressing component 320 along the second direction Y, and the first pressing component 310 bends the bag opening hem 203 of the first side 201 to the lower side where the second pressing component 320 bends the bag opening hem 203 of the second side 202.

[0115] When bending the folded edge, the bag mouth folded edge 203 of the first side 201 is bent to the lower side of the bag mouth folded edge 203 of the second side 202. The bag mouth folded edge 203 of the second side 202 that is bent can press on the bag mouth folded edge 203 of the first side 201. Only by maintaining the bag mouth folded edge 203 of the second side 202 in the bent state, the bag mouth side of the second side 202 can restrict the bag mouth folded edge 203 of the first side 201, preventing the first side 201 from recovering under its own restoring force, which is more conducive to maintaining the bag mouth folded edge 203 in the bent state.

[0116] It should be noted that since the bag mouth folded edge 203 of the first side 201 is connected to the bag mouth folded edge 203 of the second side 202, when spraying glue in the glue spraying area, glue can be sprayed only on the inner surface of the bag mouth folded edge 203 of the second side 202. In the folded edge fitting area, only the plug board 410 needs to squeeze the bag mouth folded edge 203 on the second side 202 towards the inside of the paper bag 20, so that the bag mouth folded edge 203 of the second side 202 is folded inwards and fits on the inner surface of the second side 202. At this time, the bag mouth folded edge 203 of the second side 202 will also restrict the bag mouth folded edge 203 of the first side 201 on the inner surface of the first side 201. Of course, glue can also be sprayed on the inner surfaces of the bag mouth folded edges 203 of both the first side 201 and the second side 202 to better fix the bag mouth folded edge 203.

[0117] In another alternative embodiment, the bag mouth folded edge 203 of the first side 201 and the bag mouth folded edge 203 of the second side 202 of the paper bag 20 are independent of each other. Therefore, when spraying glue in the glue spraying area, glue needs to be sprayed on the inner surfaces of the bag mouth folded edges 203 of both the first side 201 and the second side 202.

[0118] Therefore, the paper bag folding device 10 provided by the present utility model can sequentially perform operations of spraying glue, bending, and folding the bag mouth folded edge 203 of the paper bag 20, so as to fold the bag mouth folded edge 203 of the paper bag 20 inwards and fix it on the inner surface of the side. It has the advantages of simple process and high yield of the paper bag 20.

[0119] It should be noted that as Figure 1 shown, for the convenience of installing each component on the paper bag folding device 10, this paper bag folding device 10 further includes an installation platform 500. The installation platform 500 includes a base 510 and a frame 520 to assemble each component together in an associated manner. Of course, each component on the paper bag folding device 10 can also be directly integrated into the entire production line of the paper bag 20. Those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations on this.

[0120] Next, the transportation component 100 of the paper bag folding device 10 will be described in detail.

[0121] like Figures 1 - 5 As shown, the transport component 100 includes a bottom conveyor belt 120 and a pair of side conveyor belts 110 spaced apart along a first direction X. In a second direction Y, the side conveyor belt 110 and the pair of side conveyor belts 110 are respectively adapted to the bottom surface and the pair of second side surfaces 202 of the paper bag 20. It should be noted that the bottom conveyor belt 120 and the pair of side conveyor belts 110 are both disposed on a base 510 of the mounting platform 500.

[0122] Furthermore, a pair of side conveyor belts 110 are provided with adsorption areas facing the corresponding second side surfaces 202 .

[0123] Specifically, in this embodiment, the conveyor belts are all driven by belt motors 130. The belt motors 130 of a pair of side conveyor belts 110 located in the second direction Y are respectively arranged on both sides of the base 510, while the belt motor 130 of the bottom conveyor belt 120 is not shown in the figure.

[0124] It should be noted that in order to adapt to the shapes of various paper bags 20, such as Figure 3 As shown, a lifting component 140 is provided on the base 510 and is transmission-connected to the bottom conveyor belt 120 to adjust the position of the bottom conveyor belt 120 in a direction perpendicular to the bottom surface, and a spacing adjustment component (not shown in the figure) is provided between a pair of side conveyor belts 110 to adjust the spacing of a pair of side conveyor belts 110 in the first direction X. Specifically, the lifting component 140 can be configured as a ball screw structure extending in a direction perpendicular to the bottom surface, thereby linking the bottom conveyor belt 120 to move in a direction perpendicular to the bottom surface, and the spacing adjustment component can be configured as a guide rail extending in the first direction X, so that a pair of side conveyor belts 110 move in the first direction X. This embodiment does not make any specific limitation on this.

[0125] A pair of side conveyor belts 110 are provided with adsorption areas facing the corresponding second side surfaces 202, which can provide adsorption force to the second side surfaces 202 on the paper bag 20, so that the paper bag 20 is always in an unfolded state during transportation, and the bag mouth fold 203 of the paper bag 20 can be accurately attached to the inner surface of the corresponding side surface of the paper bag 20 under the action of the fold bending component 300 and the fold folding component 400.

[0126] like Figure 5 As shown, in this embodiment, the adsorption area is located at the periphery of the side conveyor belt 110, and is formed with an air suction port structure 150 connected to the air duct.

[0127] The suction port structure 150 formed in the adsorption area and connected to the air duct can provide suction to the outer surface of the second side surface 202 of the paper bag 20 without contacting the second side surface 202 of the paper bag 20, thereby reducing the risk of damaging the paper bag 20.

[0128] Of course, in another alternative embodiment, the adsorption area is located on the surface of the side conveyor belt 110. By providing a plurality of suction cups on the side conveyor belt 110, the second side surface 202 of the paper bag 20 is adsorbed on the side conveyor belt 110. Alternatively, a pattern for increasing friction is provided on the surface of the side conveyor belt 110. Depending on the frictional force between the side conveyor belt 110 and the second side surface 202 of the paper bag 20, the possibility of the second side surface 202 of the paper bag 20 sliding relative to the side conveyor belt 110 is reduced. Those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations in this regard.

[0129] Next, the glue spraying component 200 of the paper bag folding device 10 will be described in detail.

[0130] As Figure 2 shown, the glue spraying component 200 includes two glue gun seats 210 arranged at intervals along the second direction Y, corresponding to the second side surfaces 202 on both sides respectively. In the first direction X, the two glue gun seats 210 are arranged between a pair of second side surfaces 202, at an intermediate position. In the direction perpendicular to the bottom surface, the glue gun seat 210 is located on the side away from the paper bag 20 at the upper edge of the bag mouth hem 203. It should be noted that the two glue gun seats 210 are respectively fixed on the base 510 of the mounting table 500, at a position outside the side conveyor belt 110. Regarding the specific structure of the glue gun seat 210, those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations in this regard.

[0131] Among them, the glue spraying head of the glue gun seat 210 is inclined relative to the direction perpendicular to the bottom surface, towards the corresponding bag mouth hem 203. And the angle at which the glue spraying head is inclined relative to the direction perpendicular to the bottom surface is within the range of 30° to 75°. It should be noted that the angle at which the glue spraying head is inclined relative to the direction perpendicular to the bottom surface is 30°, 40°, 45°, 63.5°, 70°, 75° or any other angle within the above angle range. Those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations in this regard.

[0132] In this embodiment, the glue spraying head sprays glue obliquely relative to the direction perpendicular to the bottom surface, so that the glue is more evenly distributed on the inner surface of the bag mouth hem 203, avoiding the situation of missed coating or uneven coating, thereby improving the bonding reliability between the bag mouth hem 203 and the inner surface of the side surface.

[0133] Further, the glue strip formed by spraying the glue head towards the inner surface of the opposite bag mouth hem 203 has a distance between the glue strip and the crease within the range of 10 mm to 20 mm in the direction perpendicular to the bottom surface. It should be noted that the distance between the glue strip and the crease can be 10 mm, 12 mm, 14.6 mm, 17 mm, 20 mm or any other distance within the above range. Those skilled in the art can design according to the actual situation and specific requirements, and this embodiment does not make specific limitations in this regard.

[0134] Among them, the glue strip refers to a glue spraying object distributed in a strip shape along the second direction Y. The glue strip formed by spraying the glue head towards the inner surface of the opposite bag mouth hem 203 has a distance between the glue strip and the crease within the above range. When the bag mouth hem 203 is folded and attached to the inner surface of the side, the glue strip will be squeezed and distributed on most of the inner surface of the bag mouth hem 203, so as to ensure the firmness of the adhesion between the bag mouth hem 203 and the inner surface of the side.

[0135] In another embodiment, the glue spraying component 200 further includes another pair of glue spraying seats, and this pair of glue spraying seats have glue spraying heads respectively facing the first side 201 for spraying glue. Other structures are similar to the glue spraying seats facing the second side 202 for spraying glue, and will not be described in detail here.

[0136] In this embodiment, the inner surfaces of the bag mouth hems 203 of the first side 201 and the second side 202 are both sprayed with glue. When the bag mouth hems 203 of the first side 201 and the second side 202 are folded inwards and attached to the corresponding inner surfaces of the sides, they can be more firmly fixed at the bag mouth of the paper bag 20, increasing the strength of the bag mouth of the paper bag 20.

[0137] Next, the hem bending component 300 of the paper bag folding device 10 will be described in detail.

[0138] As Figure 3 shown, the hem bending component 300 includes a first pressing component 310 and a second pressing component 320 located above the transportation component 100. The first pressing component 310 and the second pressing component 320 respectively squeeze the corresponding bag mouth hems 203 from the outer surfaces of the bag mouth hems 203 of the first side 201 and the second side 202, so that the bag mouth hems 203 are bent towards the inside of the paper bag 20 along the crease and maintain the bent state.

[0139] Among them, as Figure 4 shown, the first pressing component 310 includes an upstream first bending member 311, a downstream first bending member 312, and a first bending maintaining member 313 arranged in sequence along the second direction Y.

[0140] Among them, the upstream first bending member 311 and the downstream first bending member 312 respectively push the bag mouth hem 203 of the first side surface 201 located upstream and downstream along the second direction Y, so that the bag mouth hem 203 bends towards the inside of the paper bag 20 along the second direction Y.

[0141] Moreover, the first bending maintaining member 313 has a first abutting portion that abuts against the bag mouth hem 203 of the first side surface 201, so that the bag mouth hem 203 maintains a bent state; in the direction perpendicular to the bottom surface, the first abutting portion is located between the crease and the upper edge of the bag mouth hem 203.

[0142] During the process of pushing the bag mouth hem 203 of the first side surface 201, the upstream first bending member 311 of the first pressing assembly 310 pushes the bag mouth hem 203 of the first side surface 201 located upstream along the second direction Y, so that the bag mouth hem 203 bends towards the inside of the paper bag 20 along the second direction Y. The downstream first bending member 312 of the first pressing assembly 310 pushes the bag mouth hem 203 of the first side surface 201 located downstream along the second direction Y, so that the bag mouth hem 203 bends towards the inside of the paper bag 20 along the second direction Y, thereby ensuring that the bag mouth hems 203 on the first side surface 201 perpendicular to the second direction Y are all bent. Further, in order to prevent the bag mouth hem 203 from resetting, through the first abutting portion on the first bending maintaining member 313, the bag mouth hem 203 on the first side surface 201 is maintained in a bent state, reducing the risk of the bag mouth hem 203 on the first side surface 201 resetting.

[0143] It should be noted that since the bending direction of the bag mouth hem 203 of the second side surface 202 located upstream on the paper bag 20 is the same as the transportation direction of the transportation member 100 along the second direction Y, during transportation, a movable upstream first bending member 311 needs to be provided. The upstream first bending member 311 needs to push the bag mouth hem 203 of the second side surface 202 upstream along the transportation direction, so that the bag mouth hem 203 of the second side surface 202 upstream bends towards the inside of the paper bag 20; while the bending direction of the bag mouth hem 203 of the second side surface 202 located downstream is opposite to the transportation direction of the transportation member 100 along the second direction Y. Therefore, only a static downstream first bending member 312 needs to be provided, which can provide a resistance force to the bag mouth hem 203 of the second side surface 202 downstream during transportation, so that the bag mouth hem 203 of the second side surface 202 downstream bends towards the inside of the paper bag 20.

[0144] Further, as Figure 6 shown, the first pressing assembly 310 further includes a pressing driving member 314, and the upstream first bending member 311 is arranged as a lower pressing plate 3110, and the pressing driving member 314 is in transmission connection with the lower pressing plate 3110.

[0145] Among them, the downward pressing driving member 314 drives the downward pressing plate 3110 to swing around the first direction X, so that the downward pressing plate 3110 abuts against the outer surface of the bag mouth fold 203 of the first side surface 201 located upstream on the paper bag 20, and pushes the bag mouth fold 203 to bend towards the inside of the paper bag 20 along the second direction Y.

[0146] Moreover, the first downward pressing assembly 310 further includes a downward pressing base plate 315, and both the downward pressing driving member 314 and the downward pressing plate 3110 are installed on the downward pressing base plate 315.

[0147] Among them, the downward pressing plate 3110 is hinged to the downward pressing base plate 315, the downward pressing driving member 314 is set as a driving cylinder 3140, and the output end of the driving cylinder 3140 is connected to the downward pressing plate 3110 offset relative to the hinge point of the downward pressing plate 3110 and the downward pressing base plate 315, and drives the downward pressing plate 3110 to swing around the hinge point.

[0148] It should be noted that, in this embodiment, a connecting plate 316 is provided between the downward pressing plate 3110 and the downward pressing base, the downward pressing plate 3110 is fixedly connected to the connecting plate 316, and the connecting plate 316 is hinged to the downward pressing base plate 315. The downward pressing plate 3110 and the connecting plate 316 can be detachably connected by screwing or clamping, etc., so as to facilitate the disassembly and assembly of the downward pressing plate 3110.

[0149] Furthermore, as Figure 6 shown, the downward pressing plate 3110 is set as an "L"-shaped bent plate structure, one end of which is connected to the connecting plate 316, and the edge of the other end is used to abut against the outer surface of the first side surface 201, so that when the downward pressing plate 3110 swings at a small angle, it can still push the bag mouth fold 203 of the first side surface 201 to bend to a large extent.

[0150] Moreover, the first downward pressing assembly 310 further includes a downward pressing mounting plate and a height adjusting member 317. The height adjusting member 317 is arranged between the downward pressing mounting plate and the downward pressing base plate 315, and drives the downward pressing base plate 315 to move relative to the downward pressing mounting plate in a direction perpendicular to the bottom surface. It should be noted that the downward pressing mounting plate is installed on the frame 520 of the mounting table 500.

[0151] As Figure 6 shown, the output end of the driving cylinder 3140 is connected to the downward pressing plate 3110 offset relative to the hinge point of the downward pressing plate 3110 and the downward pressing base plate 315, so as to convert the linear motion output by the driving cylinder 3140 into the swing of the downward pressing plate 3110 around the joint point, thereby realizing the steps of the downward pressing plate 3110 pushing the bag mouth fold 203 to bend and reset, so that the downward pressing plate 3110 can sequentially push the bag mouth folds 203 of the upstream of multiple paper bags 20.

[0152] Moreover, the height adjusting member 317 can drive the downward pressing substrate 315 to move relative to the downward pressing mounting plate in a direction perpendicular to the bottom surface, ensuring that when the downward pressing plate 3110 is in the initial position, the lower edge of the downward pressing plate 3110 is on the side away from the bottom surface of the pocket hem 203 of the first side surface 201 in the direction perpendicular to the bottom surface, so that the downward pressing plate 3110 can bend different pocket hems 203 or the hems of different paper bags 20.

[0153] Specifically, the height adjusting member 317 includes a height adjusting guide rail 3170, and the downward pressing substrate 315 is slidably connected to the height adjusting guide rail 3170. Further, for the convenience of manual operation, a handle 3171 is provided at one end of the height adjusting guide rail 3170 away from the transportation member 100.

[0154] In another alternative embodiment, the downward pressing driving member 314 is set as a power output member that outputs power linearly (such as a linear motor), and this power output member can output power in a direction inclined downstream relative to the direction perpendicular to the bottom surface, thereby driving the downward pressing plate 3110 to push the pocket hem 203 of the first side surface 201 located upstream in a direction inclined downstream relative to the direction perpendicular to the bottom surface, so that the pocket hem 203 of the first side surface 201 located upstream is bent towards the inside of the paper bag 20.

[0155] The specific structure of the upstream first bending member 311 is not limited to the structures of the above two embodiments, and this embodiment does not make specific limitations on this.

[0156] In this embodiment, as Figure 4 shown, the downstream first bending member 312 extends curvedly in the second direction Y from the upstream side along the direction close to the bottom surface until it is flush with the crease on the first side surface 201.

[0157] Specifically, the downstream first bending member 312 extends curvedly in the second direction Y from the upstream side along the direction close to the bottom surface. When the transportation member 100 transports the paper bag 20 in the second direction Y, the downstream first bending member 312 can smoothly press on the first side surface 201 located downstream, and as the paper bag 20 is transported in the second direction Y, it is gradually bent towards the inside of the paper bag 20.

[0158] Moreover, since the downstream first bending member 312 extends curvedly in the second direction Y, the downstream first bending member 312 acts on the pocket hem 203 of the first side surface 201 in a surface contact manner, avoiding the driving force acting on the pocket hem 203 of the first side surface 201 being too concentrated during the process of pushing the pocket hem 203 to bend, and reducing the risk of damage to the pocket hem 203 during the bending process.

[0159] Furthermore, the first bending maintaining member 313 extends along the second direction Y, and the lower surface of the first bending maintaining member 313 is flush with the crease on the first side surface 201 to form a first abutting portion, so that the bag mouth hem 203 of the first side surface 201 can be bent to a position flush with the crease, which is conducive to being squeezed and attached to the inner surface of the first side surface 201 in the bending and attaching area.

[0160] Moreover, the upstream end of the first bending maintaining member 313 is smoothly connected to the downstream end of the downstream first bending member 312. The bag mouth hem 203 that is pushed by the downstream first bending member 312 to bend can be immediately abutted by the first bending maintaining member 313, preventing the bag mouth hem 203 on the first side surface 201 from reverting.

[0161] In this embodiment, the downstream first bending member 312 and the first bending maintaining member 313 are formed into a rod-shaped structure. In the first direction X, the downstream first bending member 312 and the first bending maintaining member 313 are located in the middle of the first side surface 201. It should be noted that the downstream first bending member 312 and the first bending maintaining member 313 are provided with a plurality of connecting portions at intervals along the second direction Y and are connected to the frame 520 of the mounting table 500 to ensure their installation stability.

[0162] The rod-shaped downstream first bending member 312 and the first bending maintaining member 313 are located in the middle of the first side surface 201, so that the force-bearing surface of the bag mouth hem 203 of the downstream first bending member 312 and the first bending maintaining member 313 on the first side surface 201 is perpendicular to the crease of the bag mouth hem 203 of the second side surface 202, and the bag mouth hem 203 of the second side surface 202 can be bent integrally around the crease along the second direction Y.

[0163] Furthermore, in the second direction Y, an avoidance groove 3111 is formed at a position corresponding to the downstream first bending member 312 on the lower pressing plate 3110, so that the upstream end portion of the downstream first bending member 312 can extend to a relatively upstream position, so that after the lower pressing plate 3110 pushes the bag mouth hem 203 of the upstream first side surface 201 to bend, the downstream first bending member 312 will also contact the outer surface of the bag mouth hem 203 of the upstream first side surface 201, preventing the bag mouth hem 203 from resetting after separating from the lower pressing plate 3110.

[0164] In another alternative embodiment, the downstream first bending member 312 and the first bending maintaining member 313 are provided as a plate-shaped structure, but they only need to maintain the same extension direction as the rod-shaped downstream first bending member 312 and the first bending maintaining member 313.

[0165] In still another embodiment, the downstream first bending member 312 is provided with a structure similar to that of the upstream bending member. The difference is that the downstream first bending member 312 swings or moves in the upstream direction along the second direction Y, so that the hem 203 of the mouth of the second side surface 202 on the downstream side can be bent inwardly toward the inside of the paper bag 20.

[0166] The second pressing assembly 320 includes two sets of second bending members 321 and second bending maintaining members 322 that correspond to a pair of second side surfaces 202 and are arranged in sequence along the second direction Y. The two second bending members 321 and the second bending maintaining members 322 are respectively arranged on both sides of the first bending maintaining member 313 along the first direction X and are symmetrically arranged with respect to the axis of the first bending maintaining member 313, so that the second side surfaces 202 on both sides of the first direction X can be symmetrically folded inwardly to ensure that the bending degrees of the second side surfaces 202 on both sides are the same.

[0167] Among them, in the second direction Y, the second bending member 321 extends from the upstream part located outside the corresponding second side surface 202 along the inner side of the second side surface 202 and bends close to the bottom surface until it is flush with the crease on the second side surface 202.

[0168] The second bending maintaining member 322 extends along the second direction Y, and the lower surface of the second bending maintaining member 322 is flush with the crease on the second side surface 202 to form a second abutting portion.

[0169] Moreover, the upstream end of the second bending maintaining member 322 is smoothly connected to the downstream end of the second bending member 321. It should be noted that the second bending maintaining member 322 and the second bending member 321 are also provided with a plurality of connecting portions at intervals along the second direction Y and are fixed to the frame 520 of the mounting table 500 through the plurality of connecting portions, so as to maintain the assembly stability of the second bending maintaining member 322 and the second bending member 321.

[0170] Because the upstream end of the second bending maintaining member 322 is smoothly connected to the downstream end of the second bending member 321, the hem 203 of the mouth of the bag that is bent by the second bending member 321 can be immediately abutted by the second bending maintaining member, preventing the hem 203 of the mouth of the bag on the second side surface 202 from returning.

[0171] In addition, the lower surface of the second bending maintaining member 322 is flush with the crease on the second side surface 202 to form a first abutting portion, so that the hem 203 of the mouth of the second side surface 202 can be bent to a position flush with the crease, which is conducive to being pressed and attached to the inner surface of the second side surface 202 by the inserting plate 410 in the bending and attaching area.

[0172] Next, the hemming and folding member 400 of the paper bag mouth folding device 10 will be described in detail.

[0173] As Figures 1 - 3As shown, the hem folding component 400 includes at least the inserting plates 410 corresponding to a pair of second side faces 202. The inserting plates 410 can be inserted into the paper bag 20 in a direction perpendicular to the bottom surface, and push the folded bag mouth hem 203, so that the bag mouth hem 203 is folded along the crease and adheres to the inner surface of the second side face 202.

[0174] Furthermore, as Figure 8 shown, the hem folding component 400 further includes an inserting plate base 420 corresponding to the inserting plates 410, and a downward inserting driving member 430 arranged on the inserting plate base 420 and in transmission connection with the inserting plates 410. The downward inserting driving member 430 drives the inserting plates 410 to move in a direction perpendicular to the bottom surface.

[0175] And, as Figure 8 shown, the hem folding component 400 further includes a downward inserting transmission member 440 arranged between the downward inserting driving member 430 and the inserting plates 410.

[0176] Wherein, the downward inserting driving member 430 is set as a rotating motor, and the downward inserting transmission member 440 includes a transmission disk 441 and a linkage rod 442. The transmission disk 441 is arranged at the output end of the rotating motor and connected with the output end of the rotating motor. One end of the linkage rod 442 is eccentrically hinged to the transmission disk 441, and the other end is hinged to the inserting plates 410.

[0177] The power of the rotating motor is sequentially transmitted to the inserting plates 410 through the transmission disk 441 and the linkage rod 442, and the rotational motion of the output end of the rotating motor is ingeniously converted into a linear motion in a direction perpendicular to the bottom surface.

[0178] As Figure 8 shown, the hem folding component 400 further includes a follower assembly 450 arranged on the inserting plate base 420. The follower assembly 450 drives the inserting plate base 420 and the inserting plates 410 to move along the second direction Y in the hem adhering area as the paper bag 20 on the conveying component 100 moves.

[0179] The downward inserting driving member 430 of the hem folding component 400 drives the inserting plates 410 to move in a direction perpendicular to the bottom surface, so that the lower edge of the inserting plates 410 abuts against the outer surface of the bag mouth hem 203 of the second side face 202, and further bends towards the inside of the paper bag 20.

[0180] And, since the follower assembly 450 is arranged on the inserting plate base 420 and is installed on the base 510 of the installation table 500 through the follower assembly 450, it can drive the base and the inserting plates 410 to move as the paper bag 20 on the conveying component 100 moves, and complete the folding of the bag mouth hem 203 during the movement of the paper bag 20, improving the production efficiency.

[0181] Specifically, the follower component 450 includes a synchronous belt 451 extending along the second direction Y and a follower motor 452 for driving the synchronous belt 451 to move. The plug-in board base 420 is mounted on the synchronous belt 451. The follower motor 452 drives the synchronous belt 451 to move, thereby driving the plug-in board base 420 to move along the second direction Y.

[0182] As Figure 8 shown, the hemming and folding component 400 further includes a guiding component 460 disposed between the plug-in board base 420 and the plug-in board 410. The guiding component 460 is movable relative to the plug-in board base 420 in a direction perpendicular to the bottom surface, and the guiding component 460 is fixedly connected to the plug-in board 410.

[0183] By providing the guiding component 460 between the plug-in board base 420 and the plug-in board 410, it is ensured that the moving direction of the plug-in board 410 is always perpendicular to the bottom surface, ensuring that the bag mouth hem 203 in the paper bag 20 pushed by the plug-in board 410 can closely fit on the inner surface of the side of the paper bag 20.

[0184] Specifically, as Figure 8 shown, the guiding component 460 includes two guiding rods 461 spaced along the second direction Y. Of course, three, one or other numbers of guiding rods 461 can also be provided, and the present invention does not make a unique limitation on this.

[0185] Moreover, in this embodiment, in the second direction Y, the width of the plug-in board 410 is adapted to the width of the second side surface 202, and the two side edges of the plug-in board 410 in the second direction Y are bent inward along the first direction X to form folding plates 411 adapted to the two first side surfaces 201.

[0186] Since the width of the plug-in board 410 is adapted to the width of the second side surface 202, it is ensured that when the plug-in board 410 is inserted into the paper bag 20, the bag mouth hem 203 can be evenly pressed on the inner surface of the second side surface 202 in the second direction Y.

[0187] In addition, the folding plates 411 formed by bending inward along the first direction X can also press the bag mouth hem 203 on the first side surface 201 against the inner surface of the first side surface 201.

[0188] In another embodiment, the hemming and folding component 400 further includes a plug-in board 410 for the first side surface 201. Thus, under the action of the plug-in board 410, the bag mouth hem 203 on the first side surface 201 is inserted and fitted against the inner surface of the first side surface 201.

[0189] In summary, the utility model provides a paper bag folding device 10. The paper bag folding device 10 is described below in conjunction with the working process. A plurality of paper bags 20 are placed on the transport component 100 in sequence according to a predetermined spacing, so that the spacing between any two paper bags 20 is equal. Specifically, for example, the spacing between two adjacent paper bags 20 can be 50 cm, 60 cm, 80 cm or other spacings, and the utility model does not make specific limitations on this. The bottom conveyor belt 120 and a pair of side conveyor belts 110 of the transport component 100 are driven by the belt motor 130 to drive the paper bag 20 to move along the second direction Y, wherein the suction port structure 150 formed in the adsorption area and connected to the air duct can provide suction to the outer surface of the second side surface 202 of the paper bag 20 to ensure that the paper bag 20 is in an unfolded state.

[0190] When the paper bag 20 moves to the glue spraying area, the glue spraying heads of the two glue spraying seats spray glue toward the inner surface of the bag opening fold 203 of the second side surface 202 respectively, forming a glue strip on the inner surface of the bag opening fold 203 of the second side surface 202 .

[0191] Furthermore, the paper bag 20 continues to move along the second direction Y driven by the transport component 100 and enters the folding bending area. The bag opening folding edge 203 of the first side surface 201 located downstream contacts the downstream first bending member 312 first and is squeezed by the downstream first bending member 312 to bend toward the inside of the paper bag 20. When the bag opening folding edge 203 of the first side surface 201 upstream corresponds to the lower pressing plate 3110 in a direction perpendicular to the bottom surface, the lower pressing driving member 314 links the lower pressing plate 3110 to swing and push the bag opening folding edge 203 of the first side surface 201 upstream to bend toward the inside of the paper bag 20. The edge 203 will be further squeezed by the downstream first bending piece 312. As the transport component 100 moves, the pocket fold 203 of the first side 201 will abut against the first bending maintaining piece 313, and then maintain a position flush with the crease of the pocket fold 203 of the first side 201, while the pocket fold 203 of the second side 202 will contact the corresponding second bending pieces 321 on both sides, and will gather inward under the squeezing of the second bending pieces 321 until the pocket fold 203 of the second side 202 contacts the second bending maintaining piece 322, and maintains a position flush with the crease of the pocket fold 203 of the second side 202.

[0192] Further, the paper bag 20 continues to move in the second direction Y driven by the transportation component 100 and enters the hemming and laminating area. The inserting plates 410 on both sides of the first direction X of the bending and folding component move in a direction perpendicular to the bottom surface driven by the lower inserting driving component 430. And the inserting plate base 420 is driven by the follow-up component 450, so that in the second direction Y, the inserting plate 410 always corresponds to the corresponding second side surface 202. Further, the inserting plate 410 can be inserted into the paper bag 20 to push the bag mouth hem 203 of the second side surface 202 to be folded inward, and then it is laminated on the inner surface of the second side surface 202. Under the action of the adhesive tape, the bag mouth hem 203 of the second side surface 202 is fixed on the inner surface of the second side surface 202. Finally, the paper bag 20 is output from the downstream end of the transportation component 100.

[0193] It should be noted that, in addition to the implementation manners of the present utility model described in the above specific embodiments, those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. Although the description of the present utility model is introduced in combination with the preferred embodiments, this does not mean that the features of this utility model are limited to this implementation manner. On the contrary, the purpose of introducing the utility model in combination with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present utility model. In order to provide a deep understanding of the present utility model, many specific details are included in the above description. The present utility model can also be implemented without using these details. In addition, in order to avoid confusing or obscuring the key points of the present utility model, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of the present utility model can be combined with each other.

[0194] It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0195] In the description of this embodiment, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the utility model product is usually placed during use. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.

[0196] The terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0197] In the description of this embodiment, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in this embodiment can be understood according to specific situations.

[0198] Although the present invention has been illustrated and described by referring to some preferred embodiments of the present invention, those of ordinary skill in the art should understand that the above content is a further detailed description of the present invention in combination with specific embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. Those skilled in the art can make various changes in form and details, including making several simple deductions or substitutions, without departing from the spirit and scope of the present invention.

Claims

1. A paper bag folding device, the paper bag comprising a bottom surface, a pair of first side surfaces extending in a first direction and arranged opposite to each other, and a pair of second side surfaces extending in a second direction and arranged opposite to each other, the opening ends of the first side surfaces and the second side surfaces are both formed with bag opening folding edges, and each of the first side surfaces and the second side surfaces is formed with a folding line between the respective bag opening folding edges, the first direction and the second direction are perpendicular to each other and are both parallel to the bottom surface; characterized in that: The paper bag folding device comprises a transport component, which transports the paper bag in the second direction and sequentially passes through a glue spraying area, a folding and bending area, and a folding and laminating area, wherein The glue spraying area is provided with a glue spraying component, and the glue spraying component includes glue spraying heads arranged in pairs corresponding to the pair of second side surfaces, and each pair of the glue spraying heads opens toward the inner surface of the bag opening fold of the pair of second side surfaces of the paper bag; The hem bending area is provided with a hem bending component, and the hem bending component includes a first pressing component and a second pressing component located above the transport component, and the first pressing component and the second pressing component respectively press the corresponding bag opening hem from the outer surface of the bag opening hem of the first side surface and the second side surface, so that the bag opening hem is bent toward the inner side of the paper bag along the fold and maintains the bent state; The hem folding area is provided with a hem folding component, and the hem folding component includes an insert plate corresponding to at least the pair of second side surfaces. The insert plate can be inserted into the paper bag in a direction perpendicular to the bottom surface and push the bag mouth hem in a bent state, so that the bag mouth hem is folded along the crease and adhered to the inner surface of the second side surface.

2. The paper bag folding device according to claim 1, characterized in that: The edges of the bag opening folded edge of the first side surface along the two sides of the first direction are connected with the corresponding edges of the bag opening folded edge of the second side surface corresponding to the two sides; wherein, The first pressing assembly is located upstream of the second pressing assembly along the second direction, and the first pressing assembly bends the bag opening fold on the first side to the lower side where the bag opening fold on the second side is bent by the second pressing assembly.

3. The paper bag folding device according to claim 2, characterized in that: The first pressing assembly comprises an upstream first bending member, a downstream first bending member and a first bending maintaining member arranged in sequence along the second direction; in The upstream first bending member and the downstream first bending member push the bag opening folded edge of the first side located upstream and downstream respectively along the second direction, so that the bag opening folded edge is bent toward the inner side of the paper bag along the second direction; and The first bending maintenance member has a first abutment portion that abuts against the bag fold of the first side surface so that the bag fold maintains a bent state; in a direction perpendicular to the bottom surface, the first abutment portion is located between the fold and the upper edge of the bag fold.

4. The paper bag folding device according to claim 3, characterized in that: The first pressing assembly further includes a pressing driving member, the upstream first bending member is configured as a pressing plate, and the pressing driving member is in driving connection with the pressing plate; wherein The downward pressure driving member links the downward pressure plate to swing around the first direction, so that the downward pressure plate abuts against the outer surface of the bag opening folded edge of the first side surface located upstream on the paper bag, and pushes the bag opening folded edge to bend toward the inside of the paper bag along the second direction.

5. The paper bag folding device according to claim 4, characterized in that: The first pressing assembly further includes a pressing base plate, and the pressing driving member and the pressing plate are both mounted on the pressing base plate. The lower pressing plate is hinged to the lower pressing base plate, the lower pressing driving member is configured as a driving cylinder, the output end of the driving cylinder is offsetly connected to the lower pressing plate relative to the hinge point between the lower pressing plate and the lower pressing base plate, and links the lower pressing plate to swing around the hinge point, and The first pressing assembly further includes a pressing mounting plate and a height adjusting member, wherein the height adjusting member is disposed between the pressing mounting plate and the pressing base plate and links the pressing base plate to move relative to the pressing mounting plate in a direction perpendicular to the bottom surface.

6. The paper bag folding device according to claim 5, characterized in that: The downstream first bending member extends in a curved manner from the upstream side in the second direction along a direction close to the bottom surface until it is flush with the fold on the first side surface.

7. The paper bag folding device according to claim 6, characterized in that: The first bending maintenance member extends along the second direction, and the lower surface of the first bending maintenance member is flush with the fold on the first side surface to form the first abutment portion, and The upstream end of the first bending maintaining member is smoothly connected to the downstream end of the downstream first bending member.

8. The paper bag folding device according to claim 7, characterized in that: The downstream first bending member and the first bending maintaining member are formed into a rod-shaped structure, and in the first direction, the downstream first bending member and the first bending maintaining member are located in the middle of the first side surface; and The lower pressing plate is formed with an avoidance groove at a position corresponding to the downstream first bending member in the second direction.

9. The paper bag folding device according to claim 7, characterized in that: The second pressing assembly includes two groups of second bending members and second bending maintaining members corresponding to a pair of the second side surfaces and arranged in sequence along the second direction, the two second bending members and the second bending maintaining members are respectively arranged on both sides of the first bending maintaining member along the first direction, and are symmetrically arranged relative to the axis of the first bending maintaining member; wherein The second bending member extends in the second direction from an upstream portion located at the outer side of the second side surface, along the inner side close to the second side surface and close to the bottom surface, until it is flush with the fold on the second side surface; The second bending maintenance member extends along the second direction, and the lower surface of the second bending maintenance member is flush with the fold on the second side surface to form a second abutment portion; and The upstream end of the second bending maintaining member is smoothly connected to the downstream end of the second bending member.

10. The paper bag folding device according to claim 2, characterized in that: The hem folding component further includes a plug board base corresponding to the plug board, and a lower plug driving member arranged on the plug board base and connected to the plug board in a transmission manner, wherein the lower plug driving member links the plug board to move in a direction perpendicular to the bottom surface; The hem folding component also includes a follower component arranged on the plug board base, and the follower component links the plug board base and the plug board to move along the second direction in the hem folding area along with the paper bag on the transport component.

11. The paper bag folding device according to claim 10, characterized in that: The edge folding component also includes a guide component arranged between the plug board base and the plug board, the guide component can move relative to the plug board base along a direction perpendicular to the bottom surface, and the guide component is fixedly connected to the plug board.

12. The paper bag folding device according to claim 11, characterized in that: The edge folding component also includes a lower insertion transmission member arranged between the lower insertion driving member and the insertion plate, wherein The lower insert driving member is configured as a rotary motor, and the lower insert transmission member includes a transmission disk and a linkage rod, wherein the transmission disk is disposed at and connected to the output end of the rotary motor, and one end of the linkage rod is eccentrically hinged to the transmission disk, and the other end is hinged to the plug plate.

13. The paper bag folding device according to claim 10, characterized in that: In the second direction, the width of the plug plate matches the width of the second side surface, and the two side edges of the plug plate in the second direction are bent inward along the first direction to form folded plates matching the first side surfaces on both sides.

14. The paper bag folding device according to claim 1, characterized in that: The glue spraying component includes two glue gun seats arranged at intervals along the second direction, corresponding to the second side surfaces on both sides respectively. In the first direction, the two glue gun seats are arranged between a pair of the second side surfaces and are located in the middle. In the direction perpendicular to the bottom surface, the glue gun seats are located on the side of the upper edge of the bag opening fold away from the paper bag, wherein The glue spray head of the glue gun seat is inclined relative to the direction perpendicular to the bottom surface and toward the corresponding bag opening fold, and the angle of inclination of the glue spray head relative to the direction perpendicular to the bottom surface is in the range of 30° to 75°.

15. The paper bag folding device according to claim 14, characterized in that: The glue strip formed by the glue spraying head spraying toward the inner surface of the opposite bag opening fold has a spacing between the glue strip and the fold in the range of 10 mm to 20 mm in a direction perpendicular to the bottom surface.

16. The paper bag folding device according to any one of claims 1 to 15, characterized in that: The transport component comprises a bottom conveyor belt and a pair of side conveyor belts spaced apart along the first direction, wherein in the second direction, the side conveyor belt and the pair of side conveyor belts are respectively adapted to the bottom surface and the pair of second side surfaces of the paper bag; and The pair of side conveyor belts are provided with adsorption areas facing the corresponding second side surfaces.

17. The paper bag folding device according to claim 16, characterized in that: The adsorption area is located at the periphery of the side conveyor belt and is formed with an air suction port structure connected to the air duct.

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