Paper bag multiple folding and gluing fixing sealing machine

Abstract

This invention provides a paper bag multiple-folding edge-applying and sealing machine, relating to the field of paper bag sealing or packaging technology. It includes a bag-sorting mechanism, a bag-mouth cutting component, a first folding mechanism, a second folding mechanism, and a bag-mouth guide component arranged sequentially along the paper bag conveying direction. The invention employs multiple folds to form a multi-layered edge structure, with the bag mouth covered by multiple layers of paper material, resulting in no pinholes or gaps. Furthermore, it integrates automatic conveying, first folding, and second folding processes. Through the sequential cooperation of the first and second folding mechanisms, fully automated sealing of the paper bag mouth is achieved.

Description

Technical Field

[0001] This invention relates to the field of paper bag sealing or packaging technology, specifically a paper bag multiple-folding and gluing fixing sealing machine. Background Technology

[0002] Paper bags are an environmentally friendly material, and their application in industries such as food, building materials, and chemicals is becoming increasingly widespread. For packaging powdery and granular materials, the sealing quality of paper bags directly affects the transportation safety and quality assurance of the products.

[0003] Some paper bags are sealed using a sewing machine. While this method provides a high level of bond strength, the stitching leaves needle holes at the bag opening. This allows fine powdery materials (such as flour, salt, sugar, and chemical powders) to easily leak out through these holes, resulting in material loss and environmental pollution.

[0004] Other paper bags are sealed by heat sealing or gluing (adhesive bonding). Usually, the bag opening is folded once and then glued or heat-sealed. This single-fold structure has limited strength, and the bag opening is prone to cracking due to stress during long-distance transportation.

[0005] Some paper bag openings may be folded using a combination of manual and pneumatic methods, which are not highly automated and are not suitable for efficient automated operations on industrial production lines. Summary of the Invention

[0006] To address the shortcomings of existing technologies, this invention provides a paper bag multiple-folding and gluing sealing machine, which solves the problems of powder leakage, poor sealing, low strength, and low automation in existing paper bag sealing.

[0007] To achieve the above objectives, the present invention provides the following technical solution: Paper bag multiple folding, gluing, fixing and sealing machine, including: A first folding mechanism and a second folding mechanism are sequentially arranged along the paper bag conveying direction; The first folding mechanism includes a pre-folding assembly and a pressing assembly. The pre-folding assembly has a lower folding blade assembly that rotates in a first direction and forms an inner support on a first side of the paper bag, and an upper folding blade assembly that rotates in a second direction and forms an outer pressure on a second side of the paper bag. When pre-folding the paper bag, the lower folding blade assembly and the upper folding blade assembly are parallel and inclinedly distributed. The pressing assembly includes a fixed pressing block and a movable pressing block assembly, and a pressing area is formed between the fixed pressing block and the movable pressing block assembly. The pressing assembly is used to press and fold the bag opening after pre-folding. The second folding mechanism is used to fold the paper bag portion after the first fold towards the paper bag body and connect them together.

[0008] Preferably, at least two of the lower folding blade group, upper folding blade group, and movable pressure block group adopt a coaxially driven cam structure.

[0009] Preferably, the lower folding blade of the lower folding blade group is located outside the movable pressure block group, and the upper folding blade of the upper folding blade group is located above the fixed pressure block, so that the pre-folded bag opening edge of the lower and upper folding blade groups is located on the side where the movable pressure block group is located. Preferably, the first folding mechanism further includes: a first frame and a second frame that are fixedly installed; A driving component is fixedly installed on one side of the second frame, and a driving shaft is rotatably installed on the second frame. The output end of the driving component is connected to the driving shaft for transmission. The lower folding blade assembly, the upper folding blade assembly, and the movable pressure block assembly are all cam-driven, and the cams corresponding to the lower folding blade assembly, the upper folding blade assembly, and the movable pressure block assembly are all fixedly mounted on the drive shaft. The fixing block is fixedly connected to the first frame.

[0010] Preferably, the movable pressure block assembly includes: The first cam is fixedly mounted on the drive shaft; The first rocker arm has its top end rotatably connected to the second frame. The side of the first rocker arm and the contour working surface of the first cam form a cam motion pair. A first spring is provided between the side of the first rocker arm facing the first cam and the second frame. A first shaft is rotatably connected to a first frame, and a first short rod and a second short rod are fixedly installed on the first shaft. The first transmission rod has a first end rotatably connected to the bottom end of the first swing rod, and a second end rotatably connected to the end of the second short rod. The first swing arm is rotatably connected to the second frame at its middle part. The first end of the first swing arm is connected to the end of the first short rod through a first connecting rod. The second end of the first swing arm is fixedly connected to a movable pressure block.

[0011] Preferably, the upper folding blade assembly includes: The second cam is fixedly mounted on the drive shaft; The second rocker arm has its top end rotatably connected to the second frame. The side of the second rocker arm and the contour working surface of the second cam form a cam motion pair. A second spring is provided between the side of the second rocker arm facing the second cam and the second frame. The second shaft is rotatably connected to the first frame, and a third short rod is fixedly installed on the second shaft. The second transmission rod has its first end rotatably connected to the bottom end of the second swing rod, and its second end rotatably connected to the end of the third short rod. The first rod frame has its first end fixedly connected to the second shaft via a connecting block, and its second end is fixedly connected to an upper folding blade.

[0012] Preferably, the lower folding blade assembly includes: The third cam is fixedly mounted on the drive shaft; The third rocker arm, the top of which is rotatably connected to the second frame, the side of which forms a cam motion pair with the contour working surface of the third cam, and a third spring is provided between the side of the third rocker arm facing the third cam and the second frame. The third shaft is rotatably connected to the first frame, and a fourth short rod is fixedly installed on the third shaft; The third transmission rod, the first end of which is rotatably connected to the bottom end of the third swing rod, and the second end of which is rotatably connected to the end of the fourth short rod; The second rod frame has its first end fixedly connected to the third shaft via a connecting block, and its second end is fixedly connected to a downward folding blade.

[0013] Preferably, the second folding mechanism includes: an adhesive dispensing assembly and a folding assembly, with the adhesive dispensing assembly located in front of the folding assembly along the paper bag conveying direction; The dispensing assembly includes: A first bracket is fixedly installed, and an adjusting bracket is fixedly installed on the first bracket. One end of the adjusting bracket is fixedly connected to an adhesive spraying component. The compression and bending assembly includes: A second bracket is fixedly installed, and a support plate is fixedly connected to the second bracket. A telescopic member with a downward telescopic end is fixedly installed on the top of the support plate. The telescopic rod of the telescopic member passes through the support plate and is fixedly installed with a lower pressure plate.

[0014] Preferably, it further includes: a bag opening guide disposed along the paper bag conveying direction, the bag opening guide having a clearance opening at a position corresponding to the first folding mechanism and an inclined guide end at a position corresponding to the second folding mechanism.

[0015] Preferably, the first folding mechanism has multiple components arranged along the paper bag conveying direction.

[0016] This invention provides a paper bag multiple-folding, gluing, and sealing machine. It has the following beneficial effects: 1. This invention employs multiple folds (first folding mechanism for the first fold and second folding mechanism for the second fold) to form a multi-layered edge structure. The bag opening is covered by multiple layers of paper material, with no pinholes or gaps. Compared with traditional sewn-on sealing, it can completely solve the problem of fine powdery materials (such as flour, salt, chemical powders, etc.) leaking through pinholes. Compared with single-fold heat sealing, the multi-layered folding structure significantly improves the reliability of the seal.

[0017] 2. This invention integrates automatic conveying, first folding, and second folding (including glue dispensing) processes. Through the sequential cooperation of the first folding mechanism and the second folding mechanism, the fully automated operation of sealing the paper bag opening is realized. Compared with manual folding or semi-automatic sealing methods, this invention can operate continuously and at high speed, greatly reducing manual intervention, increasing output per unit time, and meeting the needs of large-scale industrial production.

[0018] 3. This invention drives multiple folding components (movable pressure block assembly, upper folding blade assembly, and lower folding blade assembly) via a cam on the same drive shaft. This results in a short power transmission path, fewer parts, a compact overall structure, and a small footprint. Compared to solutions using multiple independent cylinders or motors, this mechanical transmission method eliminates the need for complex pneumatic or electrical control, reduces potential failure points, facilitates maintenance, and lowers long-term operating costs. Attached Figure Description

[0019] Figure 1 This is a perspective view of the paper bag multiple folding, gluing, fixing, and sealing machine proposed in this invention; Figure 2 This is a three-dimensional view of the first folding mechanism of the paper bag multi-folding, gluing, fixing, and sealing machine proposed in this invention; Figure 3 This is a three-dimensional view of the second folding mechanism of the paper bag multi-folding and gluing fixing sealing machine proposed in this invention; Figure 4 This is a schematic diagram of the first folding process of the paper bag multi-folding, gluing, fixing, and sealing machine proposed in this invention; Figure 5 This is a schematic diagram of the second folding process of the paper bag multiple folding and gluing fixing sealing machine proposed in this invention; Figure 6 The data diagram shows the third cam (lower folding knife group) of the paper bag multi-folding and gluing fixing sealing machine proposed in this invention; Figure 7 The diagram shows the relevant data of the first cam (movable pressure block group) of the paper bag multi-folding and gluing fixing sealing machine proposed in this invention. Figure 8 The data diagram shows the second cam (upper folding knife group) of the paper bag multi-folding and gluing fixing sealing machine proposed in this invention; Figure 9This is a schematic diagram of the bag-sorting mechanism of the paper bag multiple-folding, gluing, fixing and sealing machine proposed in this invention, showing how the bag opening is sorted.

[0020] The components include: 1. Bag sorting mechanism; 2. Bag opening cutting component; 3. Bag opening guide component; 4. First folding mechanism; 5. Second folding mechanism; 301. Clearance opening; 302. Inclined guide end; 401. First frame; 402. Second frame; 403. Drive component; 404. Drive shaft; 405. Movable pressure block assembly; 4051. First cam; 4052. First swing arm; 4053. First spring; 4054. First transmission rod; 4055. Second short rod; 4056. First shaft; 4057. First short rod; 4058. First connecting rod; 4059. First swing arm; 40510. Movable pressure block; 406. Upper folding knife assembly; 4061. Second cam; 4062. Second swing arm; 4063. Second... Spring; 4064, Second transmission rod; 4065, Third short rod; 4066, Second shaft; 4067, First rod frame; 4068, Upper folding blade; 407, Lower folding blade assembly; 4071, Third cam; 4072, Third swing arm; 4073, Third spring; 4074, Third transmission rod; 4075, Fourth short rod; 4076, Third shaft; 4077, Second rod frame; 4078, Lower folding blade; 408, Fixed pressure block; 409, Common shaft; 501, Dispensing assembly; 5011, First bracket; 5012, Adjusting bracket; 5013, Glue spraying component; 502, Pressing and folding assembly; 5021, Second bracket; 5022, Support plate; 5023, Telescopic component; 5024, Lower pressure plate. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1: like Figures 1-9 As shown, this embodiment of the invention provides a paper bag multiple folding and gluing fixing sealing machine, which is applied to a continuous packaging production line for (powder / granular) products to realize the sealing operation of paper bags after the product is bagged. Specifically, it includes a bag sorting mechanism 1, a bag mouth cutting component 2, a first folding mechanism 4, a second folding mechanism 5 arranged sequentially along the paper bag conveying direction, and a bag mouth guide component 3 for constraining and guiding the bag mouth at the bag mouth cutting component 2, the first folding mechanism 4, and the second folding mechanism 5.

[0023] Understandably, the bag-handling mechanism 1 is used to close the opening of the paper bag, such as... Figure 9 As shown, the opening of the paper bag after processing is sheet-like ( Figure 9 (As shown in the rightmost state), the sorted paper bag opening enters the area where the bag opening guide 3 is located along the paper bag conveying direction. The bag opening guide 3 restricts the paper bag opening to ensure that the paper bag opening remains flat during subsequent conveying. The bag opening guide 3 includes two parallel strip plates with a 1-3 cm gap between them. The paper bag opening passes through the gap between the two strip plates. The bag opening shear 2 is used to cut the top of the paper bag opening to ensure that the bag opening height is consistent when entering the subsequent first folding mechanism 4, eliminating the influence of shape error at the paper bag opening on folding (due to different actual product loading amounts in the paper bag and dimensional errors during sorting by the bag sorting mechanism 1, the height of the paper bag opening varies). The bag opening shear 2 includes a fixed blade and a movable blade driven by a cylinder. The cylinder drives the movable blade to move towards the fixed blade to cut the bag opening. The first folding mechanism 4 is used to perform the first folding of the bag opening, such as... Figure 4 As shown, the bag opening enters the area where the first folding mechanism 4 is located, and it completes a 180° fold; then it enters the second folding mechanism 5, which folds the paper bag part after the first fold towards the paper bag body and connects them together, thereby completing the folding and sealing of the paper bag.

[0024] Specifically, the first folding mechanism 4 includes a pre-folding assembly and a pressing assembly. The pre-folding assembly has a lower folding blade assembly 407 that rotates in a first direction and forms an inner support on the first side of the paper bag, and an upper folding blade assembly 406 that rotates in a second direction and forms an outer pressure on the second side of the paper bag. The "first direction rotation" and "second direction rotation" refer to two opposite directions, such as clockwise and counterclockwise. The "first side of the paper bag" and "second side of the paper bag" refer to the two sides of the opening of the sheet-like paper bag. It can be understood that the lower folding blade assembly 407 and the upper folding blade assembly 406 are located on both sides of the opening of the sheet-like paper bag. When pre-folding the paper bag, the lower folding blade assembly 407 and the upper folding blade assembly 406 are parallel and inclined. The opening of the paper bag is located in the area between the lower folding blade assembly 407 and the upper folding blade assembly 406, forming a crease. The entire opening area above the crease is folded downwards at the same angle as the inclination angle of the lower folding blade assembly 407 and the upper folding blade assembly 406. It can be understood that the lower folding blade assembly 407 and the upper folding blade assembly 406 pre-fold the paper bag by rotating. The angular position of the lower folding blade assembly 407 and the upper folding blade assembly 406 when not pre-folding the paper bag is not limited here. The pressing assembly includes a fixed pressing block 408 and a movable pressing block assembly 405, and a pressing and folding area is formed between the fixed pressing block 408 and the movable pressing block assembly 405. After the above pre-folding, the opening of the paper bag presents... Figure 4As shown in the middle diagram, the movable pressure block group 405 then starts to operate, and the lower folding knife group 407 and the upper folding knife group 406 retract synchronously. The fixed pressure block 408 and the movable pressure block group 405 flatten the pre-folded paper bag opening, forming a 180° fold effect. After that, the fixed pressure block 408 and the movable pressure block group 405 separate, and the paper bag enters the next process.

[0025] The second folding mechanism 5 folds the paper bag section, which has undergone the first fold, toward the main body of the paper bag and connects them together, thereby completing the folding and sealing of the paper bag.

[0026] It is understandable that the paper bag opening after being folded by the first folding mechanism 4 and the second folding mechanism 5 has the following characteristics: the upper part of the bag opening is folded 180°, and then folded about 90°, so that the bag opening after the first fold is connected to the main body of the bag; compared with the traditional single folding structure, this folding method has higher strength, and the bag opening is not easy to tear during long-distance transportation; the multiple folding method makes the bag opening more airtight, and it can be used to hold powdery / granular products without leakage from the bag opening.

[0027] The multi-action folding structure, which consists of a pre-folding component and a pressing component, can achieve folding action within a short range during the paper bag conveying process. Compared with the folding method that uses a guide and cylinder push rod, it completes the 180° fold more smoothly and achieves a better folding effect.

[0028] In one embodiment, at least two of the lower folding blade assembly 407, the upper folding blade assembly 406, and the movable pressure block assembly 405 employ coaxially driven cam structures.

[0029] For example, if the lower folding blade assembly 407 and the upper folding blade assembly 406 require more coordinated movements, a coaxially driven cam structure can be used as the synchronous drive method (based on a synchronously rotating cam design, the timing can be controlled), and the movable pressure block assembly 405 is driven by an independently controlled cylinder; or, for example, the lower folding blade assembly 407, the upper folding blade assembly 406, and the movable pressure block assembly 405 all use a coaxially driven cam structure as the synchronous drive method.

[0030] In one embodiment, the lower folding blade 4078 of the lower folding blade assembly 407 is located outside the movable pressure block assembly 405, and the upper folding blade 4068 of the upper folding blade assembly 406 is located above the fixed pressure block 408. This ensures that the pre-folded bag opening edge of the lower folding blade assembly 407 and the upper folding blade assembly 406 is located on the side where the movable pressure block assembly 405 is located. During the retraction action of the lower folding blade assembly 407 and the upper folding blade assembly 406, the pre-folded bag opening edge may partially return to its original position. The movable pressure block assembly 405 will directly squeeze and push it to the side where the fixed pressure block 408 is located, thereby effectively avoiding problems such as improper connection of various components, resulting in the inability to fold or uneven folding.

[0031] It is understandable that the movable pressure block group 405 is a movable structure. When it retracts, it can make way for the lower folding blade 4078 of the lower folding blade group 407 and the upper folding blade 4068 of the upper folding blade group 406. This allows the lower folding blade group 407 and the upper folding blade group 406 to complete pre-folding in the area between the fixed pressure block 408 and the movable pressure block group 405. This facilitates the movable pressure block group 405 to directly perform pressing and folding after the lower folding blade group 407 and the upper folding blade group 406 are retracted. All actions can be connected without interference.

[0032] In one embodiment, the first folding mechanism 4 further includes: a first frame 401 and a second frame 402 fixedly disposed; the first frame 401 and the second frame 402 can be integral or separate, and their fixing can be understood as fixing to the ground or other supports.

[0033] A drive component 403 is fixedly installed on one side of the second frame 402. The drive component 403 is a drive system consisting of a servo motor and a reducer. A drive shaft 404 is rotatably installed on the second frame 402. The output end of the drive component 403 is connected to the drive shaft 404 for transmission. It can be understood that the drive component 403 drives the drive shaft 404 to rotate.

[0034] The lower folding blade assembly 407, the upper folding blade assembly 406, and the movable pressure block assembly 405 are all cam-driven, and the cams corresponding to the lower folding blade assembly 407, the upper folding blade assembly 406, and the movable pressure block assembly 405 are all fixedly mounted on the drive shaft 404; that is, the lower folding blade assembly 407, the upper folding blade assembly 406, and the movable pressure block assembly 405 adopt a coaxially driven cam structure.

[0035] The fixed pressure block 408 is fixedly connected to the first frame 401. The fixed pressure block 408 is used to cooperate with the movable pressure block group 405 to achieve the final pressing.

[0036] In one embodiment, such as Figure 2 As shown, the movable pressure block assembly 405 includes: a first cam 4051, a first rocker arm 4052, a first spring 4053, a first short rod 4057, a second short rod 4055, a first shaft 4056, a first transmission rod 4054, a first rocker arm 4059, a first connecting rod 4058, and a movable pressure block 40510.

[0037] The first cam 4051 is fixedly mounted on the drive shaft 404 and is driven to rotate by the drive shaft 404. The top end of the first rocker arm 4052 is rotatably connected to the second frame 402. The side of the first rocker arm 4052 and the contour working surface of the first cam 4051 form a cam motion pair. A first spring 4053 is provided between the side of the first rocker arm 4052 facing the first cam 4051 and the second frame 402. The first spring 4053 is used to drive the first rocker arm 4052 to rotate towards the first cam 4051. The rotation of the first cam 4051 pushes the first rocker arm 4052 towards the first cam 4051. The other side rotates; the first shaft 4056 is rotatably connected to the first frame 401, the first short rod 4057 and the second short rod 4055 are fixedly installed on the first shaft 4056, the first end of the first transmission rod 4054 is rotatably connected to the bottom end of the first swing rod 4052, the second end of the first transmission rod 4054 is rotatably connected to the end of the second short rod 4055, the middle part of the first swing arm 4059 is rotatably connected to the second frame 402, the first end of the first swing arm 4059 is connected to the end of the first short rod 4057 through the first connecting rod 4058, and the second end of the first swing arm 4059 is fixedly connected to a movable pressure block 40510.

[0038] Understandably, the first spring 4053 is in a stretched state, which allows the side of the first rocker arm 4052 to contact the contour working surface of the first cam 4051. By designing the contour working surface of the first cam 4051, the first rocker arm 4052 can be driven to swing in a preset manner. Then, the bottom end of the first rocker arm 4052 drives the first transmission rod 4054, and the other end of the first transmission rod 4054 drives the second short rod 4055 to rotate, thereby driving the first shaft 4056 to rotate. The first shaft 4056 drives the first short rod 4057 to swing, and the first short rod 4057 drives the first rocker arm 4059 to rotate through the first connecting rod 4058. The other end of the first rocker arm 4059 drives the movable pressure block 40510 to move, so that it completes the opening and closing action with the fixed pressure block 408.

[0039] In one embodiment, such as Figure 2 As shown, the upper folding knife assembly 406 includes: a second cam 4061, a second rocker arm 4062, a second spring 4063, a second shaft 4066, a third short rod 4065, a second transmission rod 4064, a first rod holder 4067, and an upper folding knife 4068.

[0040] The second cam 4061 is fixedly mounted on the drive shaft 404, and is synchronously driven to rotate by the drive shaft 404. The top end of the second rocker arm 4062 is rotatably connected to the second frame 402. The side of the second rocker arm 4062 and the contour working surface of the second cam 4061 form a cam motion pair. A second spring 4063 is provided between the side of the second rocker arm 4062 facing the second cam 4061 and the second frame 402. The second spring 4063 is in a stretched state to keep the second rocker arm 4062 always in contact with the side of the second cam 4061. When the second cam 4061 rotates, it can push the second rocker arm 4062 to swing outward; the second shaft 4066 is rotatably connected to the first frame 401, and a third short rod 4065 is fixedly installed on the second shaft 4066; the first end of the second transmission rod 4064 is rotatably connected to the bottom end of the second rocker arm 4062, and the second end of the second transmission rod 4064 is rotatably connected to the end of the third short rod 4065; the first end of the first rod frame 4067 is fixedly connected to the second shaft 4066 through a connecting block, and the second end of the first rod frame 4067 is fixedly connected to the upper folding knife 4068.

[0041] Understandably, the second spring 4063 is in a stretched state, which allows the side of the second rocker arm 4062 to contact the contour working surface of the second cam 4061. By designing the contour working surface of the second cam 4061, the second rocker arm 4062 can be driven to swing in a preset manner. Then, the bottom end of the second rocker arm 4062 drives the second transmission rod 4064 to move, and the other end of the second transmission rod 4064 drives the third short rod 4065 to swing. The third short rod 4065 drives the second shaft 4066 to rotate, and the second shaft 4066 drives the first rod frame 4067 to swing, thereby driving the upper folding knife 4068 to move.

[0042] In one embodiment, such as Figure 2 As shown, the lower folding blade assembly 407 includes: a third cam 4071, a third rocker arm 4072, a third spring 4073, a third shaft 4076, a third transmission rod 4074, a fourth short rod 4075, a second rod holder 4077, and a lower folding blade 4078.

[0043] The third cam 4071 is fixedly mounted on the drive shaft 404, and is synchronously driven to rotate by the drive shaft 404. The top end of the third rocker arm 4072 is rotatably connected to the second frame 402. The side of the third rocker arm 4072 and the contour working surface of the third cam 4071 form a cam motion pair. A third spring 4073 is provided between the side of the third rocker arm 4072 facing the third cam 4071 and the second frame 402. The third spring 4073 is in a stretched state, used to make the contour working surfaces of the third rocker arm 4072 and the third cam 4071 abut against each other. Two 4073s can be set to ensure the stability of the downward folding blade 4078. The third shaft 4076 is rotatably connected to the first frame 401. A fourth short rod 4075 is fixedly installed on the third shaft 4076. The first end of the third transmission rod 4074 is rotatably connected to the bottom end of the third swing rod 4072. The second end of the third transmission rod 4074 is rotatably connected to the end of the fourth short rod 4075. The second rod frame 4077 has its first end fixedly connected to the third shaft 4076 through a connecting block. The second end of the second rod frame 4077 is fixedly connected to the downward folding blade 4078.

[0044] Understandably, the third spring 4073 is in a stretched state, which allows the side of the third rocker arm 4072 to contact the contour working surface of the third cam 4071. By designing the contour working surface of the third cam 4071, the third rocker arm 4072 can be driven to swing in a preset manner. Then, the bottom end of the third rocker arm 4072 drives the third transmission rod 4074 to move, and the other end of the third transmission rod 4074 drives the fourth short rod 4075. The fourth short rod 4075 drives the third shaft 4076 to rotate, and the third shaft 4076 drives the second rod frame 4077 to swing, thereby driving the lower folding knife 4078 to move.

[0045] To facilitate the installation of the first spring 4053, the second spring 4063, and the third spring 4073, a common shaft 409 parallel to the drive shaft 404 is fixedly installed on the second frame 402, and the ends of the first spring 4053, the second spring 4063, and the third spring 4073 are all hung on the common shaft 409.

[0046] In one embodiment, such as Figure 3 As shown, the second folding mechanism 5 includes: a dispensing assembly 501 and a pressing and folding assembly 502. Along the paper bag conveying direction, the dispensing assembly 501 is located in front of the pressing and folding assembly 502.

[0047] Understandably, after the first fold, the bag opening is conveyed to the location of the dispensing component 501, which sprays glue (hot melt glue, water-based glue, pressure-sensitive glue, etc.) onto the bag opening. Then, it is conveyed to the location of the folding component 502, which folds the bag opening after the first fold and connects it to the main body of the paper bag.

[0048] Specifically, the dispensing assembly 501 includes: a first bracket 5011 fixedly mounted, an adjusting bracket 5012 fixedly mounted on the first bracket 5011, and an adhesive spraying component 5013 fixedly connected to one end of the adjusting bracket 5012. The adhesive spraying component 5013 is an adhesive liquid nozzle and is equipped with a delivery pipe and a control valve.

[0049] Specifically, the folding assembly 502 includes: a fixedly mounted second bracket 5021, a support plate 5022 fixedly connected to the second bracket 5021, a telescopic member 5023 with its telescopic end pointing downwards fixedly mounted on the top of the support plate 5022, the telescopic rod of the telescopic member 5023 passing through the support plate 5022, and a lower pressure plate 5024 fixedly mounted thereon, the lower pressure plate 5024 and the support plate 5022 can be provided with a guide assembly, the telescopic member 5023 drives the lower pressure plate 5024 to move downwards, and folds the bag opening after the first fold.

[0050] In one embodiment, the bag opening guide 3 is provided with a clearance opening 301 at a position corresponding to the first folding mechanism 4, and with an inclined guide end 302 at a position corresponding to the second folding mechanism 5.

[0051] The design of the clearance opening 301 allows the bag opening guide 3 to make way for the first folding mechanism 4, avoiding motion interference when the first folding mechanism 4 is in operation. The design of the inclined guide end 302 allows the bag opening after the first fold to tilt, which facilitates the folding of the second folding mechanism 5.

[0052] In one embodiment, in order to further improve the sealing and strength of the bag opening fold, multiple first folding mechanisms 4 are provided along the paper bag conveying direction. The height of the multiple first folding mechanisms 4 can be adjusted appropriately so that the bag opening height after the first first folding mechanism 4 performs the first fold can meet the requirements of the second first folding mechanism 4 performing the second fold.

[0053] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A paper bag multiple-folding, gluing, fixing, and sealing machine, characterized in that, include: A first folding mechanism (4) and a second folding mechanism (5) are arranged sequentially along the paper bag conveying direction. The first folding mechanism (4) includes a pre-folding assembly and a pressing assembly. The pre-folding assembly has a lower folding blade assembly (407) that rotates in a first direction and forms an inner support on the first side of the paper bag, and an upper folding blade assembly (406) that rotates in a second direction and forms an outer pressure on the second side of the paper bag. When the paper bag is pre-folded, the lower folding blade assembly (407) and the upper folding blade assembly (406) are parallel and inclinedly distributed. The pressing assembly includes a fixed pressing block (408) and a movable pressing block assembly (405). A pressing area is formed between the fixed pressing block (408) and the movable pressing block assembly (405). The pressing assembly is used to press the bag opening after pre-folding. The second folding mechanism (5) is used to fold the paper bag portion after the first fold toward the paper bag body and connect them together.

2. The paper bag multiple folding, gluing, fixing, and sealing machine according to claim 1, characterized in that: At least two of the lower folding blade assembly (407), upper folding blade assembly (406), and movable pressure block assembly (405) employ coaxially driven cam structures.

3. The paper bag multiple folding, gluing, fixing, and sealing machine according to claim 1, characterized in that: The lower folding blade (4078) of the lower folding blade group (407) is located outside the movable pressure block group (405), and the upper folding blade (4068) of the upper folding blade group (406) is located above the fixed pressure block (408), so that the bag opening folded edge of the lower folding blade group (407) and the upper folding blade group (406) after pre-folding is located on the side where the movable pressure block group (405) is located.

4. The paper bag multiple folding, gluing, fixing, and sealing machine according to claim 1, characterized in that, The first folding mechanism (4) further includes: a first frame (401) and a second frame (402) that are fixedly installed; A drive component (403) is fixedly installed on one side of the second frame (402), and a drive shaft (404) is rotatably installed on the second frame (402). The output end of the drive component (403) is connected to the drive shaft (404) in a transmission connection. The lower folding blade assembly (407), the upper folding blade assembly (406), and the movable pressure block assembly (405) are all cam-driven, and the cams corresponding to the lower folding blade assembly (407), the upper folding blade assembly (406), and the movable pressure block assembly (405) are all fixedly mounted on the drive shaft (404); The fixed pressure block (408) is fixedly connected to the first frame (401).

5. The paper bag multiple folding and gluing fixing sealing machine according to claim 4, characterized in that, The movable briquetting assembly (405) includes: The first cam (4051) is fixedly mounted on the drive shaft (404); The first rocker arm (4052) has its top end rotatably connected to the second frame (402). The side of the first rocker arm (4052) and the contour working surface of the first cam (4051) form a cam motion pair. A first spring (4053) is provided between the side of the first rocker arm (4052) facing the first cam (4051) and the second frame (402). The first shaft (4056) is rotatably connected to the first frame (401), and a first short rod (4057) and a second short rod (4055) are fixedly installed on the first shaft (4056). The first transmission rod (4054) has its first end rotatably connected to the bottom end of the first swing rod (4052), and its second end rotatably connected to the end of the second short rod (4055). The first swing arm (4059) is rotatably connected to the second frame (402) at its middle part. The first end of the first swing arm (4059) is connected to the end of the first short rod (4057) through the first connecting rod (4058). The second end of the first swing arm (4059) is fixedly connected to a movable pressure block (40510).

6. The paper bag multiple folding and gluing fixing sealing machine according to claim 4, characterized in that, The upper folding blade assembly (406) includes: The second cam (4061) is fixedly mounted on the drive shaft (404); The second rocker arm (4062) has its top end rotatably connected to the second frame (402). The side of the second rocker arm (4062) and the contour working surface of the second cam (4061) form a cam motion pair. A second spring (4063) is provided between the side of the second rocker arm (4062) facing the second cam (4061) and the second frame (402). The second shaft (4066) is rotatably connected to the first frame (401), and a third short rod (4065) is fixedly installed on the second shaft (4066). The second transmission rod (4064) has its first end rotatably connected to the bottom end of the second swing rod (4062), and its second end rotatably connected to the end of the third short rod (4065). The first rod frame (4067) has its first end fixedly connected to the second shaft (4066) via a connecting block, and its second end is fixedly connected to an upper folding blade (4068).

7. The paper bag multiple folding, gluing, fixing, and sealing machine according to claim 4, characterized in that, The lower folding blade assembly (407) includes: The third cam (4071) is fixedly mounted on the drive shaft (404); The third rocker arm (4072) is rotatably connected to the second frame (402) at its top end. The side of the third rocker arm (4072) and the contour working surface of the third cam (4071) form a cam motion pair. A third spring (4073) is provided between the side of the third rocker arm (4072) facing the third cam (4071) and the second frame (402). The third shaft (4076) is rotatably connected to the first frame (401), and a fourth short rod (4075) is fixedly installed on the third shaft (4076). The third transmission rod (4074) has its first end rotatably connected to the bottom end of the third swing rod (4072), and its second end rotatably connected to the end of the fourth short rod (4075). The second rod (4077) has its first end fixedly connected to the third shaft (4076) via a connecting block, and its second end is fixedly connected to a downward folding blade (4078).

8. The paper bag multiple folding and gluing fixing sealing machine according to claim 1, characterized in that, The second folding mechanism (5) includes: a dispensing assembly (501) and a folding assembly (502). Along the paper bag conveying direction, the dispensing assembly (501) is located in front of the folding assembly (502). The dispensing assembly (501) includes: A first bracket (5011) is fixedly installed, and an adjusting bracket (5012) is fixedly installed on the first bracket (5011). One end of the adjusting bracket (5012) is fixedly connected to an adhesive spraying component (5013). The compression and bending assembly (502) includes: A second bracket (5021) is fixedly installed, and a support plate (5022) is fixedly connected to the second bracket (5021). A telescopic member (5023) with its telescopic end pointing downward is fixedly installed on the top of the support plate (5022). The telescopic rod of the telescopic member (5023) passes through the support plate (5022) and is fixedly installed with a lower pressure plate (5024).

9. The paper bag multiple folding, gluing, fixing, and sealing machine according to claim 1, characterized in that, Also includes: A bag opening guide (3) is provided along the paper bag conveying direction. The bag opening guide (3) has a clearance opening (301) at a position corresponding to the first folding mechanism (4) and an inclined guide end (302) at a position corresponding to the second folding mechanism (5).

10. The paper bag multiple folding, gluing, fixing, and sealing machine according to claim 1, characterized in that: The first folding mechanism (4) has multiple components along the paper bag conveying direction.

Images