A paper bag punching, stringing and bag opening reversing machine

Abstract

This invention discloses a paper bag punching, drawstring threading, and bag opening reversing machine, belonging to the field of paper bag processing equipment. The machine includes a frame, a conveying assembly, and punching, drawstring threading, gluing, and bag opening reversing stations arranged sequentially along the conveying direction. The drawstring threading station is symmetrically equipped with a tensioning mechanism, a drawstring gripping mechanism, a pushing mechanism, and a bag opening support mechanism on both sides, working in conjunction with a first suction cup mechanism to automatically tension, grip, and thread the flat drawstring through the bag hole. The gluing station is equipped with a gluing assembly for automatically applying glue to the inside of the bag opening. The bag opening reversing station is equipped with a three-axis linkage folding assembly, which can automatically fold the short and long sides of the bag opening. This invention can adapt to the automatic threading of flat drawstrings and integrates multiple processes such as punching, gluing, bottom plate assembly, gluing, and bag opening reversing, achieving full automation of paper bag processing and improving production efficiency and finished product quality.

Description

Technical Field

[0001] This invention belongs to the field of bag opening machine technology, specifically relating to a paper bag punching, drawstring threading, and reverse bag opening machine. Background Technology

[0002] Currently, in the paper bag processing industry, the drawstring threading and folding of the bag opening are key processes affecting finished product quality and production efficiency. Existing technologies, some paper bag drawstring threading equipment employs mechanical threading mechanisms, which automatically thread round ropes into pre-set holes at the bag opening and use simple folding devices to initially shape the bag opening. However, such equipment is typically only suitable for ropes with a circular cross-section (i.e., round ropes). The threading mechanism is designed based on the flexibility and uniform cross-section of round ropes, completing the threading action through rotation or pushing. Furthermore, for some irregularly shaped ropes (such as flat ropes), due to their flat cross-section and relatively stiff texture, the existing threading structure struggles to stably clamp and accurately feed them into the bag holes; therefore, manual threading is commonly used in the industry. Simultaneously, the folding of the bag opening often relies on subsequent independent processes or manual operation, resulting in a low overall level of automation.

[0003] However, the aforementioned existing technologies have significant shortcomings in practical applications. First, limited by the structural form of the threading mechanism, existing equipment cannot meet the requirements for automatic threading of flat ropes. Manual threading is not only inefficient and labor-intensive, but also difficult to guarantee the accuracy of the threading position, easily leading to quality problems such as skewing and missed threading, affecting the appearance and reliability of the paper bags. Second, existing equipment usually lacks an automatic glue application function for the inside of the bag opening, resulting in an insufficiently firm connection between the rope end and the bag opening after threading, making it prone to detachment during use. Furthermore, the bag opening folding process is often separated from the threading process, lacking an integrated bag opening folding mechanism. This makes it impossible to directly and stably fold the bag opening inward after threading, resulting in complex process flow, inconsistent production rhythm, and a need to improve the overall level of automation and product consistency.

[0004] Therefore, developing a paper bag punching, rope threading, and bag opening reversing machine that can automatically thread flat ropes, automatically apply glue to the inside of the bag opening, and automatically fold the bag opening has become an urgent technical problem to be solved in this field. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a paper bag punching, drawstring threading, and bag opening reversing machine.

[0006] The objective of this invention can be achieved through the following technical solutions: A paper bag punching, drawstring threading, and bag opening reversing machine includes a frame, a drawstring threading assembly and a conveying assembly mounted on the frame. The conveying assembly includes a conveyor motor, a support wheel, and a conveyor belt. The conveyor belt is sleeved on the roller shaft of the output shaft of the conveyor motor and the support wheel. The drawstring threading assembly includes a first suction cup mechanism, a drawstring gripping mechanism, a pushing mechanism, a tensioning mechanism, and a bag opening support mechanism. The tensioning mechanism is used to feed and tension the flat rope. The drawstring gripping mechanism is used to grip the flat rope on the tensioning mechanism and place it onto the drawstring threading station. The suction cup mechanism is located on both sides of the conveyor belt at the threading station. The first suction cup mechanism is used to attract and open the two sides of the paper bag. The bag opening support mechanism is located above the threading station. The bag opening support mechanism is used to extend into the paper bag and form support after the paper bag is opened by the first suction cup mechanism. The pushing mechanism is located below the gripping mechanism and is used to push the flat rope into the rope hole of the paper bag. The gripping mechanism, the pushing mechanism and the tensioning mechanism each include two sets and are respectively located on both sides of the conveyor belt for threading the rope on both sides of the paper bag.

[0007] As a further embodiment of the present invention, the tensioning mechanism includes a roller, a driving wheel, a driven wheel, a lifting wheel, a guide wheel, and a first motor. The roller has a feed cylinder for loading flat rope. The first motor is mounted on the frame and is connected to the driving wheel. The circumferential surfaces of the driving wheel and the driven wheel abut against each other. A lifting cylinder is vertically mounted on the frame. The lifting wheel is mounted on the lifting cylinder. The flat rope passes through the feed cylinder, passes over the abutting surfaces of the driving wheel and the driven wheel, and then passes around the lifting wheel and the guide wheel in sequence. The lifting cylinder drives the lifting wheel to rise and fall as the driving wheel rotates to feed the material, thereby tensioning the flat rope. The guide wheel is used to guide the flat rope to the clamping area.

[0008] As a further embodiment of the present invention, the rope-grabbing mechanism includes a horizontal slide rail, a horizontal slider, a second motor, a rope-grabbing screw, a third motor, a rope-grabbing cylinder, and a rope-grabbing rod. The horizontal slider is slidably disposed on the horizontal slide rail. The second motor shaft is disposed downwards at the top of the horizontal slider and connected to the rope-grabbing rod. A first clamping block is disposed at the bottom of the rope-grabbing rod. The rope-grabbing cylinder is horizontally disposed at the bottom of the horizontal slider. A second clamping block is disposed at the front end of the piston rod of the rope-grabbing cylinder to form a rope-grabbing gripper with the first clamping block. The rope-grabbing screw is disposed parallel to the horizontal slide rail, and the third motor is drivenly connected to the rope-grabbing screw. The horizontal slider is sleeved on the rope-grabbing screw and slides horizontally on the horizontal slide rail as the rope-grabbing screw rotates. The rope-grabbing gripper is used to grab the flat rope in the clamping area and feed it.

[0009] As a further embodiment of the present invention, the pushing mechanism includes a slide table, a pushing screw, a fourth motor, a pre-clamping cylinder, a pushing cylinder, a pushing plate, and a pre-clamping plate. The slide table is horizontally slidably disposed on the frame and located below the rope gripping mechanism. The pushing screw is disposed on the frame and located below the slide table. The fourth motor is drivenly connected to the pushing screw. The slide table is sleeved on the pushing screw. The pre-clamping cylinder and the pushing cylinder are both disposed on the slide table and both face the rope threading station. The pre-clamping plate is disposed at the front end of the piston rod of the pre-clamping cylinder. A fixing plate is disposed on the slide table at the front end of the pre-clamping plate. The pre-clamping cylinder drives the pre-clamping plate to abut perpendicularly against the fixing plate to grip the flat rope on the rope gripping claw and form a pre-clamp. The pushing plate is disposed at the front end of the piston rod of the pushing cylinder. The pushing plate is used to horizontally push the flat rope, which is vertically clamped by the pre-clamping plate and the fixing plate, toward the rope threading station and through the rope hole of the paper bag.

[0010] As a further embodiment of the present invention, the bag opening support mechanism includes a support cylinder, a support robotic arm, a support slide plate, a support screw, and a fifth motor. A support slide rail is vertically arranged on the frame, the support slide plate is slidably arranged on the support slide rail, the support screw is horizontally arranged on the frame and the support slide rail, the fifth motor is drively connected to the support screw, the support slide plate is sleeved on the support screw, the support cylinder is arranged on the support slide plate, the support robotic arm is arranged on the piston rod of the support cylinder and vertically downward toward the rope threading station, and the side of the support robotic arm is horizontally rotatably equipped with rollers for rolling contact with the paper bag when it is inserted.

[0011] As a further embodiment of the present invention, it also includes a gluing assembly and a second suction cup assembly. The gluing assembly is disposed on the gluing station on the frame, and the gluing station is disposed at the rear end of the rope threading station. The second suction cup mechanism is disposed on both sides of the conveyor belt on the gluing station. The second suction cup mechanism is used to attract and open the two sides of the paper bag. The gluing assembly includes a gluing slide rail, a gluing drive mechanism, a gluing slider, a gluing cylinder, and a gluing nozzle. The gluing slider is slidably disposed on the gluing slide rail. The gluing drive mechanism is drivenly connected to the gluing slider and is used to drive the gluing slider to slide horizontally. The gluing cylinder is disposed on the gluing slider. The gluing nozzle is disposed at the front end of the piston rod of the gluing cylinder. The gluing nozzle is used to apply glue in a strip shape inside the opening of the paper bag.

[0012] As a further embodiment of the present invention, it also includes a folding assembly and a third suction cup assembly. The folding assembly is disposed at the folding station at the rear end of the threading assembly process. The folding station is disposed at the rear end of the gluing station. The third suction cup mechanism is disposed on both sides of the conveyor belt at the folding station. The third suction cup mechanism is used to attract and open the two sides of the paper bag. The folding assembly includes an X-axis slide rail and an X-axis drive mechanism disposed on the frame along the X-axis direction. Two sets of X-axis sliders are slidably disposed on the X-axis slide rail. Two sets of trapezoidal support plates facing opposite directions are disposed on the two sets of X-axis sliders. The X-axis drive mechanism is used to drive the two sets of X-axis sliders to expand or contract synchronously. It also includes a Y-axis cylinder arranged along the Y-axis direction. The piston rod of the Y-axis cylinder is provided with a Y-axis slider at the front end. The Y-axis slider is provided with a Y-axis flipping cylinder. A Y-axis flap is hinged to the Y-axis slider. The Y-axis flipping cylinder is hinged to the rear end of the Y-axis flap. The extension and retraction of the Y-axis flipping cylinder is used to drive the front end of the Y-axis flap to flip forward or return to its original position. It also includes an auxiliary slide rail, an auxiliary slider, and a Y-axis drive mechanism. The auxiliary slider is arranged parallel to the X-axis slide rail and is slidably mounted on the auxiliary slide rail. The Y-axis drive mechanism is connected to the auxiliary slider and is used to drive the auxiliary slider to expand or contract. A Z-axis cylinder is arranged on the auxiliary slider along the Z-axis direction. A Z-axis slider is arranged at the front end of the piston rod of the Z-axis cylinder. A Z-axis flipping cylinder is arranged on the Z-axis slider. A Z-axis flip plate is hinged to the Z-axis slider. The Z-axis flipping cylinder is hinged to the rear end of the Z-axis flip plate. The extension and retraction of the Z-axis flipping cylinder is used to drive the front end of the Z-axis flip plate to flip forward or return to its original position. The X-axis drive mechanism drives the trapezoidal support plate on the X-axis slider to open inside the paper bag and form a folding platform. The Z-axis flip plate slides along the auxiliary slide rail and performs an initial 90° fold on the short side of the paper bag. After the trapezoidal support plate on the X-axis slider is reset, the Z-axis flip plate is driven by the Z-axis flip cylinder to perform a final 180° fold on the short side. After the short side of the paper bag is folded, the Y-axis flip cylinder drives the Y-axis flip plate to perform a 180° fold on the long side of the paper bag.

[0013] As a further embodiment of the present invention, it also includes a punching assembly and a fourth suction cup assembly. The punching assembly is disposed at the punching station on the frame, and the fourth suction cup assembly is disposed on both sides of the conveyor belt at the punching station. The fourth suction cup assembly is used to suction and open both sides of the paper bag. The punching assembly includes a punching slide rail, a punching slider, a punching drive mechanism, and a punching clamp. The punching slide rail is vertically disposed on the frame, the punching slider is slidably disposed on the punching slide rail, the punching drive mechanism is connected to the punching slider and drives the punching slider to move up and down, and the punching clamp is disposed on the punching slider and is used to clamp the paper bag before punching.

[0014] As a further embodiment of the present invention, it also includes a base plate assembly and a fifth suction cup assembly. The base plate assembly is disposed on the base plate station on the frame, and the base plate station is disposed at the rear end of the punching station. The fifth suction cup mechanism is disposed on both sides of the conveyor belt on the base plate station. The fifth suction cup mechanism is used to suction and open the two sides of the paper bag. The base plate assembly includes a base plate slide rail, a base plate slider, a base plate driving mechanism, and a base plate suction cup. The base plate slide rail is vertically disposed on the frame. The base plate slider is slidably disposed on the base plate slide rail. The base plate driving mechanism is connected to the base plate slider and drives the base plate slider to move up and down. The base plate suction cup is disposed on the side of the base plate slider and is used to suction the base plate and place the base plate at the bottom of the paper bag.

[0015] As a further embodiment of the present invention, it also includes a dispensing assembly and a sixth suction cup assembly. The dispensing assembly is disposed at the dispensing station on the frame, and the dispensing station is located at the front end of the rope threading station. The sixth suction cup mechanism is disposed on both sides of the conveyor belt at the dispensing station. The sixth suction cup mechanism is used to suction and open both sides of the paper bag. The dispensing assembly includes a dispensing slide rail, a dispensing drive mechanism, a dispensing slider, a dispensing cylinder, and a dispensing nozzle. The dispensing slider is slidably disposed on the dispensing slide rail. The dispensing drive mechanism is drivenly connected to the dispensing slider and is used to drive the dispensing slider to slide horizontally. The dispensing cylinder is disposed on the dispensing slider. The dispensing nozzle is disposed at the front end of the piston rod of the dispensing cylinder. The dispensing nozzle is used to dispense glue in a dotted pattern at the fixed position of the flat rope inside the opening of the paper bag.

[0016] The beneficial effects of this invention are as follows: 1. Achieve fully automatic flat rope threading: Through the coordinated operation of the tensioning mechanism, rope gripping mechanism, pushing mechanism and bag opening support mechanism, the problem that existing equipment can only thread round ropes or rely on manual threading of flat ropes is solved. It can stably and accurately thread flat ropes into bag holes, greatly improving production efficiency and threading consistency.

[0017] 2. Achieve automated bag opening folding with smooth creases: The bag opening folding station uses an X-axis trapezoidal support plate to open the bag opening and form a support platform. Then, the Z-axis flip plate first folds the short side twice at 90°+90°, and finally the Y-axis flip plate folds the long side at 180°. The folding sequence is scientific and the action is stable. The bag opening creases are clear and the appearance is beautiful, completely replacing manual folding. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0020] Figure 2 This is a schematic diagram of the left front side structure of the punching assembly, base plate assembly, and dispensing assembly of the present invention.

[0021] Figure 3 This is a schematic diagram of the right front side structure of the punching assembly, base plate assembly, and dispensing assembly of the present invention.

[0022] Figure 4 This is a schematic diagram of the right front side structure of the adhesive application assembly of the present invention.

[0023] Figure 5 This is a schematic diagram of the right front side first view structure of the folding component of the present invention.

[0024] Figure 6 This is a magnified first-view structural diagram of the right front side of the folding component of the present invention.

[0025] Figure 7 This is a schematic diagram of the right front side second view structure of the folding component of the present invention.

[0026] Figure 8 This is a magnified structural diagram of the right front side of the folding component of the present invention from a second perspective.

[0027] Figure 9 This is a schematic diagram of the front structure of the folding component of the present invention.

[0028] Figure 10 This is a front structural diagram of the rope threading assembly of the present invention.

[0029] Figure 11 This is a schematic diagram of the right front side structure of the rope threading assembly of the present invention.

[0030] In the diagram: 1. Frame; 2. Drilling assembly; 21. Drilling drive mechanism; 22. Drilling clamp; 3. Base plate assembly; 31. Fifth suction cup assembly; 32. Base plate slide rail; 33. Base plate slider; 34. Base plate suction cup; 4. Dispensing assembly; 41. Sixth suction cup assembly; 42. Dispensing slide rail; 43. Dispensing slider; 44. Dispensing nozzle; 5. Rope threading assembly; 511. Roller; 512. Driven wheel; 513. Drive wheel; 514. Lifting wheel; 515. Guide wheel; 521. Horizontal slide rail; 522. Horizontal slider; 523. Rope-gripping screw; 524. Rope-gripping cylinder; 525. Rope-gripping rod; 526. Third motor; 527. Rope-gripping gripper; 531. Slide table; 532. Push screw; 533. Pre-clamping cylinder; 534. Pre-clamping plate; 541. Support screw; 542. Fifth motor; 543. Support slide rail; 544. Support robotic arm; 545. First suction cup mechanism; 6. Glue application assembly; 61. Second suction cup assembly; 62. Glue application slide rail; 63. Glue application slider; 64. Glue application nozzle; 7. Folding assembly; 8. Conveying assembly. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0032] Please see Figures 1-11 A paper bag punching, drawstring threading, and bag opening reversing machine includes a frame 1, a drawstring threading assembly 5 and a conveying assembly 8 mounted on the frame 1. The conveying assembly 8 includes a conveyor motor, a support wheel, and a conveyor belt. The conveyor belt is sleeved on a roller 511 of the output shaft of the conveyor motor and the support wheel. The drawstring threading assembly 5 includes a first suction cup mechanism 545, a drawstring gripping mechanism, a pushing mechanism, a tensioning mechanism, and a bag opening support mechanism. The tensioning mechanism is used to feed and tension the flat rope. The drawstring gripping mechanism is used to grip the flat rope on the tensioning mechanism and place it at the drawstring threading station. The first suction cup mechanism 545 is disposed on both sides of the conveyor belt at the rope threading station. The first suction cup mechanism 545 is used to attract and open the two sides of the paper bag. The bag mouth support mechanism is disposed above the rope threading station. The bag mouth support mechanism is used to extend into the paper bag and form support after the paper bag is opened by the first suction cup mechanism 545. The pushing mechanism is disposed below the rope gripping mechanism and is used to push the flat rope into the rope hole of the paper bag. The rope gripping mechanism, the pushing mechanism and the tensioning mechanism each include two sets and are respectively disposed on both sides of the conveyor belt for threading ropes on both sides of the paper bag.

[0033] A conveyor belt driven by a motor transports paper bags sequentially to the threading station. Upon arrival at the threading station, the first suction cup mechanism 545 suctions the paper bags from both sides and opens them outwards, fully expanding the bag opening. The bag opening support mechanism extends downwards into the bag opening to provide stable support and prevent the bag opening from retracting. Simultaneously, the tensioning mechanism leads the flat rope out from the feeding end and maintains appropriate tension; the rope-grabbing mechanism moves to the tensioning mechanism, grabs the end of the flat rope, and pulls it to one side of the threading station. The pushing mechanism takes the end of the flat rope, aligns it with the rope hole on the side of the paper bag, and pushes it horizontally to pass the flat rope through the rope hole. Because the rope-grabbing, pushing, and tensioning mechanisms are symmetrically arranged on both sides, the threading action on both sides of the paper bag can be completed simultaneously.

[0034] This solution automates the entire process of feeding, tensioning, gripping, and threading flat ropes, making it particularly suitable for flat ropes with a flat cross-section, filling the gap in existing equipment that can only thread round ropes. Two sets of symmetrical mechanisms can simultaneously thread ropes from both sides, resulting in high efficiency. Furthermore, the bag opening support mechanism ensures the stability of the bag opening shape during threading, improving the accuracy of the threading position and the consistency of the finished product.

[0035] As a further embodiment of the present invention, the tensioning mechanism includes a roller 511, a drive wheel 513, a driven wheel 512, a lifting wheel 514, a guide wheel 515, and a first motor. The roller 511 is used to load a material cylinder for flat rope. The first motor is mounted on the frame 1 and is connected to the drive wheel 513 for transmission. The circumferential surfaces of the drive wheel 513 and the driven wheel 512 abut against each other. A lifting cylinder is vertically mounted on the frame 1. The lifting wheel 514 is mounted on the lifting cylinder. The flat rope passes through the material cylinder, through the abutting surfaces of the drive wheel 513 and the driven wheel 512, and then passes sequentially around the lifting wheel 514 and the guide wheel 515. The lifting cylinder drives the lifting wheel 514 to rise and fall as the first motor drives the drive wheel 513 to rotate and feed material, thereby tensioning the flat rope. The guide wheel 515 is used to guide the flat rope to the clamping area.

[0036] The first motor drives the drive wheel 513 to rotate, and the drive wheel 513, through friction with the driven wheel 512, propels the flat rope forward. After being released from the drum, the flat rope first gains driving force by passing through the pressing surface between the drive wheel 513 and the driven wheel 512, and then sequentially passes over the lifting wheel 514 and the guide wheel 515. During the feeding process, the lifting cylinder intermittently raises and lowers according to a preset program or sensor feedback, causing the lifting wheel 514 to move up and down, thereby changing the path length of the flat rope, achieving dynamic tension, and preventing the flat rope from slack or tangling. The guide wheel 515 precisely guides the flat rope to the clamping area, waiting for the rope grabbing mechanism to pick it up.

[0037] The drive wheel 513 and driven wheel 512 work together to stably transport flat rope without slipping; the active lifting wheel 514 can adjust the tension in real time according to the feeding length, avoid the flat rope from twisting or piling up, and ensure that the rope segment is straight and the position is accurate when gripping it later. It is especially suitable for flat rope, which is stiff and easy to twist.

[0038] As a further embodiment of the present invention, the rope-grabbing mechanism includes a horizontal slide rail 521, a horizontal slider 522, a second motor, a rope-grabbing screw 523, a third motor 526, a rope-grabbing cylinder 524, and a rope-grabbing rod 525. The horizontal slider 522 is slidably disposed on the horizontal slide rail 521. The shaft of the second motor is disposed downward at the top of the horizontal slider 522 and connected to the rope-grabbing rod 525. A first clamping block is disposed at the bottom of the rope-grabbing rod 525. The rope-grabbing cylinder 524 is horizontally disposed on the horizontal slider 521. At the bottom of 22, a second clamping block is provided at the front end of the piston rod of the rope-grabbing cylinder 524 to form a rope-grabbing claw 527 with the first clamping block. The rope-grabbing screw 523 is arranged parallel to the horizontal slide rail 521, and the third motor 526 is connected to the rope-grabbing screw 523 for transmission. The horizontal slider 522 is sleeved on the rope-grabbing screw 523 and slides horizontally on the horizontal slide rail 521 as the rope-grabbing screw 523 rotates. The rope-grabbing claw 527 is used to grab the flat rope in the clamping area and feed it.

[0039] The third motor 526 drives the rope-gripping screw 523 to rotate, causing the horizontal slider 522 to move along the horizontal slide rail 521 to above the clamping area. The rope-gripping cylinder 524 actuates, pushing the second clamping block closer to the first clamping block to clamp the end of the flat rope. Subsequently, the horizontal slider 522 moves in the opposite direction, pulling the flat rope to the vicinity of the rope-threading station. The second motor can drive the rope-gripping rod 525 to rotate, adjusting the angle of the flat rope to align it with the axis of the paper bag rope hole, facilitating subsequent pushing. Specifically, the flat rope also needs to be cut, and both ends of the flat rope are gripped by two sets of rope-gripping mechanisms respectively.

[0040] The screw drive system ensures smooth movement and precise positioning, guaranteeing consistent rope gripping position each time. The 527 rope gripper is cylinder-driven, providing controllable clamping force and rapid response. The rotation function of the second motor allows the flat rope to actively adjust its posture before insertion, adapting to different rope hole angles and improving the success rate of rope threading.

[0041] As a further embodiment of the present invention, the pushing mechanism includes a slide table 531, a pushing screw 532, a fourth motor, a pre-clamping cylinder 533, a pushing cylinder, a pushing plate, and a pre-clamping plate 534. The slide table 531 is horizontally slidably disposed on the frame 1 and located below the rope gripping mechanism. The pushing screw 532 is disposed on the frame 1 and located below the slide table 531. The fourth motor is drively connected to the pushing screw 532. The slide table 531 is sleeved on the pushing screw 532. The pre-clamping cylinder 533 and the pushing cylinder are both disposed on the slide table 531. The pre-clamping plate 534 is located on the front end of the piston rod of the pre-clamping cylinder 533, and a fixing plate is provided on the slide table 531 at the front end of the pre-clamping plate 534. The pre-clamping cylinder 533 drives the pre-clamping plate 534 to abut against the fixing plate perpendicularly to grab the flat rope on the rope gripper 527 and form a pre-clamp. The pushing plate is located on the front end of the piston rod of the pushing cylinder. The pushing plate is used to push the flat rope, which is perpendicularly clamped by the pre-clamping plate 534 and the fixing plate, horizontally toward the rope threading station and through the rope hole of the paper bag.

[0042] When the rope-gripping mechanism delivers the end of the flat rope between the pre-clamping plate 534 and the fixed plate, the pre-clamping cylinder 533 pushes the pre-clamping plate 534 to vertically clamp the flat rope onto the fixed plate, forming a stable grip. Then, the fourth motor drives the push screw 532, causing the entire slide table 531 to move towards the paper bag, feeding the end of the flat rope into the rope hole. Simultaneously or subsequently, the push cylinder actuates, and the push plate further pushes the flat rope axially, ensuring it completely passes through the rope hole and protrudes to an appropriate length.

[0043] The pre-clamping mechanism uses a vertical abutment method to clamp the flat surface of the flat rope, which will not damage the rope and prevent the flat rope from twisting during the pushing process. The push screw 532 is combined with the push cylinder to achieve a combination of long-distance coarse feeding and short-distance fine pushing, so that the flat rope can be smoothly and accurately passed into the bag hole without jamming or deviation.

[0044] As a further embodiment of the present invention, the bag opening support mechanism includes a support cylinder, a support robotic arm 544, a support slide plate, a support screw 541, and a fifth motor 542. A support slide rail 543 is vertically arranged on the frame 1, and the support slide plate is slidably arranged on the support slide rail 543. The support screw 541 is horizontally arranged on the frame 1 and the support slide rail 543. The fifth motor 542 is drivenly connected to the support screw 541. The support slide plate is sleeved on the support screw 541. The support cylinder is arranged on the support slide plate. The support robotic arm 544 is arranged on the piston rod of the support cylinder and faces vertically downward toward the rope threading station. The side of the support robotic arm 544 is horizontally rotatably equipped with rollers for rolling contact with the paper bag when it is inserted into the paper bag.

[0045] The fifth motor 542 drives the support screw 541, causing the support slide plate to move horizontally along the support rail 543, aligning the support robotic arm 544 with the center of the bag opening. The piston rod of the support cylinder extends downward, sending the support robotic arm 544 into the paper bag. The rollers on the side of the support robotic arm 544 roll in contact with the inner wall of the paper bag, providing support without damaging the paper. During the drawstring threading process, the rollers can rotate slightly with the shape of the bag opening to maintain stable support. Both horizontal and vertical directions can be precisely adjusted to adapt to different sizes of paper bags. The roller structure reduces friction, preventing scratches on the inner wall of the bag, while ensuring that the bag opening remains open during drawstring threading, significantly improving the smoothness of drawstring threading and the alignment of the holes.

[0046] As a further embodiment of the present invention, it also includes a gluing assembly 6 and a second suction cup assembly 61. The gluing assembly 6 is disposed on the gluing station on the frame 1, and the gluing station is disposed at the rear end of the rope threading station. The second suction cup mechanism is disposed on both sides of the conveyor belt on the gluing station. The second suction cup mechanism is used to attract and open the two sides of the paper bag. The gluing assembly 6 includes a gluing slide rail 62, a gluing drive mechanism, a gluing slider 63, a gluing cylinder, and a gluing nozzle 64. The gluing slider 63 is slidably disposed on the gluing slide rail 62. The gluing drive mechanism is connected to the gluing slider 63 and is used to drive the gluing slider 63 to slide horizontally. The gluing cylinder is disposed on the gluing slider 63. The gluing nozzle 64 is disposed at the front end of the piston rod of the gluing cylinder. The gluing nozzle 64 is used to apply glue in a strip shape inside the opening of the paper bag.

[0047] After the drawstring is threaded, the paper bag is conveyed to the gluing station. A second suction cup mechanism reopens the bag opening, and the gluing drive mechanism moves the gluing slider 63 horizontally along the gluing rail 62, aligning the gluing nozzle 64 with the area inside the bag opening where gluing is needed. The gluing cylinder extends, inserting the gluing nozzle 64 into the bag to a suitable depth. Then, as the slider moves, the nozzle 64 sprays strip-shaped glue along the drawstring end or folded area inside the bag opening. Automatic strip-shaped gluing provides an adhesive base for subsequent bag opening folding, ensuring a firm bond between the folded bag opening and the drawstring end, preventing loosening during use. The gluing position and length can be precisely controlled by the drive mechanism, resulting in uniform glue application and avoiding the contamination and inefficiency of manual gluing. As a further embodiment of the present invention, it also includes a folding component 7 and a third suction cup component. The folding component 7 is disposed at the folding station at the rear end of the threading component 5 process. The folding station is disposed at the rear end of the gluing station. The third suction cup mechanism is disposed on both sides of the conveyor belt at the folding station. The third suction cup mechanism is used to suction and open the two sides of the paper bag. The folding component 7 includes an X-axis slide rail and an X-axis drive mechanism disposed on the frame 1 along the X-axis direction. Two sets of X-axis sliders are slidably disposed on the X-axis slide rail. Two sets of trapezoidal support plates facing opposite directions are disposed on the two sets of X-axis sliders. The X-axis drive mechanism is used to drive the two sets of X-axis sliders to expand or contract synchronously. It also includes a Y-axis cylinder arranged along the Y-axis direction. The piston rod of the Y-axis cylinder is provided with a Y-axis slider at the front end. The Y-axis slider is provided with a Y-axis flipping cylinder. A Y-axis flap is hinged to the Y-axis slider. The Y-axis flipping cylinder is hinged to the rear end of the Y-axis flap. The extension and retraction of the Y-axis flipping cylinder is used to drive the front end of the Y-axis flap to flip forward or return to its original position. It also includes an auxiliary slide rail, an auxiliary slider, and a Y-axis drive mechanism. The auxiliary slider is arranged parallel to the X-axis slide rail and is slidably mounted on the auxiliary slide rail. The Y-axis drive mechanism is connected to the auxiliary slider and is used to drive the auxiliary slider to expand or contract. A Z-axis cylinder is arranged on the auxiliary slider along the Z-axis direction. A Z-axis slider is arranged at the front end of the piston rod of the Z-axis cylinder. A Z-axis flipping cylinder is arranged on the Z-axis slider. A Z-axis flip plate is hinged to the Z-axis slider. The Z-axis flipping cylinder is hinged to the rear end of the Z-axis flip plate. The extension and retraction of the Z-axis flipping cylinder is used to drive the front end of the Z-axis flip plate to flip forward or return to its original position. The X-axis drive mechanism drives the trapezoidal support plate on the X-axis slider to open inside the paper bag and form a folding platform. The Z-axis flip plate slides along the auxiliary slide rail and performs an initial 90° fold on the short side of the paper bag. After the trapezoidal support plate on the X-axis slider is reset, the Z-axis flip plate is driven by the Z-axis flip cylinder to perform a final 180° fold on the short side. After the short side of the paper bag is folded, the Y-axis flip cylinder drives the Y-axis flip plate to perform a 180° fold on the long side of the paper bag.

[0048] After the third suction cup mechanism opens the bag opening, the X-axis drive mechanism causes the two sets of trapezoidal support plates to move synchronously outward inside the bag, opening the bag opening into a rectangle and forming a folding platform. First, the Z-axis cylinder on the auxiliary slider descends, and the Z-axis flip plate is located inside the short side of the paper bag. The Z-axis folding cylinder pushes the Z-axis flip plate forward by 90°, initially folding the short side. Then, the X-axis slider returns to its original position, the trapezoidal support plates retract, and the Z-axis folding cylinder continues to push the Z-axis flip plate to 180°, completing the short side folding and flattening. Next, the Y-axis cylinder sends the Y-axis flip plate to the long side position, and the Y-axis folding cylinder drives the Y-axis flip plate forward by 180°, completely folding the long side over the short side.

[0049] Through the linkage of X, Y, and Z axes, the short and long sides of the paper bag are folded in a step-by-step and orderly manner, and the trapezoidal support plate provides stable support during the folding process to prevent deformation of the bag opening. The sequence of folding the short side first and then the long side, as well as the design of folding twice (90°+90°), makes the creases clear and flat, and the bag opening is beautiful and sturdy after folding, which is fully automated.

[0050] As a further embodiment of the present invention, it also includes a punching assembly 2 and a fourth suction cup assembly. The punching assembly 2 is disposed at the punching station on the frame 1, and the fourth suction cup assembly is disposed on both sides of the conveyor belt at the punching station. The fourth suction cup assembly is used to suction and open the two sides of the paper bag. The punching assembly 2 includes a punching slide rail, a punching slider, a punching drive mechanism 21, and a punching clamping plate 22. The punching slide rail is vertically disposed on the frame 1, and the punching slider is slidably disposed on the punching slide rail. The punching drive mechanism 21 is connected to the punching slider and drives the punching slider to move up and down. The punching clamping plate 22 is disposed on the punching slider and is used to clamp the paper bag before punching.

[0051] The paper bag first enters the punching station, where the fourth suction cup mechanism opens the bag opening. The punching drive mechanism 21 drives the punching slider to descend along the punching rail, causing the punching clamp 22 to press against the predetermined position on the side wall of the paper bag. The punching clamp 22 integrates punching tools (or works with a bottom mold) to complete the punching action, forming a rope hole. After completion, the punching slider rises and resets. Integrating punching and subsequent rope threading onto the same production line reduces process transfer and positioning errors. The punching clamp 22 clamps the paper bag during punching, preventing paper tearing or hole misalignment, ensuring standard rope hole size and neat edges, providing excellent conditions for rope threading.

[0052] As a further embodiment of the present invention, it also includes a base plate assembly 3 and a fifth suction cup assembly 31. The base plate assembly 3 is disposed on the base plate station on the frame 1, and the base plate station is disposed at the rear end of the punching station. The fifth suction cup mechanism is disposed on both sides of the conveyor belt on the base plate station. The fifth suction cup mechanism is used to suction and open the two sides of the paper bag. The base plate assembly 3 includes a base plate slide rail 32, a base plate slider 33, a base plate driving mechanism, and a base plate suction cup 34. The base plate slide rail 32 is vertically disposed on the frame 1. The base plate slider 33 is slidably disposed on the base plate slide rail 32. The base plate driving mechanism is connected to the base plate slider 33 and drives the base plate slider 33 to move up and down. The base plate suction cup 34 is disposed on the side of the base plate slider 33 and is used to suction the base plate and place the base plate at the bottom of the paper bag.

[0053] After punching, the paper bag is moved to the bottom plate station, where the fifth suction cup mechanism opens the bag opening. The bottom plate suction cup 34 picks up a pre-made bottom plate (usually cardboard) from the material pile. The bottom plate drive mechanism drives the bottom plate slider 33 to descend, sending the bottom plate into the bottom of the paper bag. The bottom plate suction cup 34 then releases, completing the bottom plate assembly. Automatic bottom plate assembly enhances the load-bearing capacity and stiffness of the paper bag's bottom. The bottom plate suction cup 34 can adapt to bottom plates of different thicknesses, with precise placement, forming a complete bag-making process with punching, threading, and opening, significantly reducing manual intervention.

[0054] As a further embodiment of the present invention, it also includes a dispensing assembly 4 and a sixth suction cup assembly 41. The glue coating assembly 6 is disposed on the dispensing station on the frame 1. The dispensing station is located at the front end of the rope threading station. The sixth suction cup mechanism is disposed on both sides of the conveyor belt at the dispensing station. The sixth suction cup mechanism is used to suction and open both sides of the paper bag. The dispensing assembly 4 includes a dispensing slide rail 42, a dispensing drive mechanism, a dispensing slider 43, a dispensing cylinder, and a dispensing nozzle 44. The dispensing slider 43 is slidably disposed on the dispensing slide rail 42. The dispensing drive mechanism is connected to the dispensing slider 43 and is used to drive the dispensing slider 43 to slide horizontally. The dispensing cylinder is disposed on the dispensing slider 43. The dispensing nozzle 44 is disposed at the front end of the piston rod of the dispensing cylinder. The dispensing nozzle 44 is used to dispense glue in a dotted manner at the fixed position of the flat rope inside the opening of the paper bag.

[0055] Before threading the rope, the paper bag enters the glue dispensing station. The sixth suction cup mechanism opens the bag opening, and the glue dispensing drive mechanism moves the glue nozzle 44 to the position inside the bag opening where the end of the flat rope needs to be fixed. The glue dispensing cylinder sends it into the bag, applying a small amount of glue dots (not strips) at the predetermined position. Then the paper bag enters the rope threading station, where the flat rope is threaded and presses precisely onto the glue dots. After the glue dots cure, the rope end is then glued to the bag wall.

[0056] The dot-application and subsequent strip-application functions complement each other—dot-application secures the ends of the flat rope to prevent slippage, while strip-application ensures overall adhesion when folding the bag opening. Their distinct roles result in more economical glue usage and prevent glue from contaminating the rope before threading, thus avoiding any issues with smooth threading. The dot-application station is positioned before the threading station, which helps match the initial curing time of the glue dots with the production cycle.

[0057] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A paper bag hole-punching, string threading and bag opening reversing machine, characterized by: The device includes a frame, a rope threading assembly and a conveying assembly mounted on the frame. The conveying assembly includes a conveyor motor, support wheels, and a conveyor belt. The conveyor belt is fitted onto the roller shaft of the conveyor motor output shaft and the support wheels. The rope threading assembly includes a first suction cup mechanism, a rope gripping mechanism, a pushing mechanism, a tensioning mechanism, and a bag opening support mechanism. The tensioning mechanism is used to feed and tension the flat rope. The rope gripping mechanism is used to grip the flat rope on the tensioning mechanism and place it onto the rope threading station. The first suction cup mechanism is located on both sides of the conveyor belt at the rope threading station. The first suction cup mechanism is used to attract and open the two sides of the paper bag. The bag opening support mechanism is located above the rope threading station. The bag opening support mechanism is used to extend into and support the paper bag after it has been opened by the first suction cup mechanism. The pushing mechanism is located below the rope gripping mechanism and is used to push the flat rope into the rope hole of the paper bag. The rope gripping mechanism, the pushing mechanism, and the tensioning mechanism each include two sets and are respectively located on both sides of the conveyor belt for threading ropes onto both sides of the paper bag.

2. A bag hole punch and stringer and bag re-closer according to claim 1 wherein: The tensioning mechanism includes a roller, a drive wheel, a driven wheel, a lifting wheel, a guide wheel, and a first motor. The roller has a feed cylinder for loading flat rope. The first motor is mounted on the frame and is connected to the drive wheel. The circumferential surfaces of the drive wheel and the driven wheel abut against each other. A lifting cylinder is vertically mounted on the frame, and the lifting wheel is mounted on the lifting cylinder. The flat rope passes through the feed cylinder, through the abutting surfaces of the drive wheel and the driven wheel, and then passes around the lifting wheel and the guide wheel in sequence. The lifting cylinder drives the lifting wheel to rise and fall as the first motor drives the drive wheel to rotate and feed the rope, thus tensioning the flat rope. The guide wheel guides the flat rope to the clamping area.

3. A paper bag punching, drawstring threading, and bag opening machine according to claim 2, characterized in that: The rope-grabbing mechanism includes a horizontal slide rail, a horizontal slider, a second motor, a rope-grabbing screw, a third motor, a rope-grabbing cylinder, and a rope-grabbing rod. The horizontal slider is slidably mounted on the horizontal slide rail. The second motor shaft is positioned downwards at the top of the horizontal slider and connected to the rope-grabbing rod. A first clamping block is provided at the bottom of the rope-grabbing rod. The rope-grabbing cylinder is horizontally mounted at the bottom of the horizontal slider. A second clamping block is provided at the front end of the piston rod of the rope-grabbing cylinder to form a rope-grabbing gripper with the first clamping block. The rope-grabbing screw is parallel to the horizontal slide rail, and the third motor is drively connected to the rope-grabbing screw. The horizontal slider is sleeved on the rope-grabbing screw and slides horizontally on the horizontal slide rail as the rope-grabbing screw rotates. The rope-grabbing gripper is used to grab and feed the flat rope in the clamping area.

4. A paper bag punching, drawstring threading, and bag-closing machine according to claim 3, characterized in that: The pushing mechanism includes a slide table, a pushing screw, a fourth motor, a pre-clamping cylinder, a pushing cylinder, a pushing plate, and a pre-clamping plate. The slide table is horizontally slidably mounted on the frame and located below the rope gripping mechanism. The pushing screw is mounted on the frame and located below the slide table. The fourth motor is drivenly connected to the pushing screw. The slide table is sleeved on the pushing screw. The pre-clamping cylinder and the pushing cylinder are both mounted on the slide table and face the rope threading station. The pre-clamping plate is located at the front end of the piston rod of the pre-clamping cylinder. A fixing plate is provided on the slide table at the front end of the pre-clamping plate. The pre-clamping cylinder drives the pre-clamping plate to perpendicularly abut against the fixing plate to grip the flat rope on the rope gripping claw and form a pre-clamp. The pushing plate is located at the front end of the piston rod of the pushing cylinder. The pushing plate is used to horizontally push the flat rope, which is perpendicularly clamped by the pre-clamping plate and the fixing plate, toward the rope threading station and through the rope hole of the paper bag.

5. A paper bag punching, drawstring threading, and bag-closing machine according to claim 4, characterized in that: The bag opening support mechanism includes a support cylinder, a support robotic arm, a support slide plate, a support screw, and a fifth motor. A support slide rail is vertically mounted on the frame, and the support slide plate is slidably mounted on the support slide rail. The support screw is horizontally mounted on the frame and the support slide rail. The fifth motor is connected to the support screw via a transmission. The support slide plate is sleeved on the support screw. The support cylinder is mounted on the support slide plate. The support robotic arm is mounted on the piston rod of the support cylinder and faces vertically downward toward the rope threading station. The side of the support robotic arm is horizontally rotatably equipped with rollers for rolling contact with the paper bag when it is inserted.

6. A paper bag punching, drawstring threading, and bag-closing machine according to claim 5, characterized in that: It also includes a gluing assembly and a second suction cup assembly. The gluing assembly is disposed on the gluing station on the frame, which is located at the rear end of the rope threading station. The second suction cup mechanism is disposed on both sides of the conveyor belt on the gluing station. The second suction cup mechanism is used to suction and open the two sides of the paper bag. The gluing assembly includes a gluing slide rail, a gluing drive mechanism, a gluing slider, a gluing cylinder, and a gluing nozzle. The gluing slider is slidably disposed on the gluing slide rail. The gluing drive mechanism is drivenly connected to the gluing slider and is used to drive the gluing slider to slide horizontally. The gluing cylinder is disposed on the gluing slider. The gluing nozzle is disposed at the front end of the piston rod of the gluing cylinder. The gluing nozzle is used to apply glue in a strip shape inside the opening of the paper bag.

7. A paper bag punching, drawstring threading, and bag opening machine according to claim 6, characterized in that: It also includes a folding assembly and a third suction cup assembly. The folding assembly is located at the folding station at the rear end of the threading assembly process. The folding station is located at the rear end of the gluing station. The third suction cup mechanism is located on both sides of the conveyor belt at the folding station. The third suction cup mechanism is used to attract and open the two sides of the paper bag. The folding assembly includes an X-axis slide rail and an X-axis drive mechanism arranged along the X-axis direction on the frame. Two sets of X-axis sliders are slidably arranged on the X-axis slide rail. Two sets of trapezoidal support plates facing opposite directions are arranged on the two sets of X-axis sliders. The X-axis drive mechanism is used to drive the two sets of X-axis sliders to expand or contract synchronously. It also includes a Y-axis cylinder arranged along the Y-axis direction. The piston rod of the Y-axis cylinder is provided with a Y-axis slider at the front end. The Y-axis slider is provided with a Y-axis flipping cylinder. A Y-axis flap is hinged to the Y-axis slider. The Y-axis flipping cylinder is hinged to the rear end of the Y-axis flap. The extension and retraction of the Y-axis flipping cylinder is used to drive the front end of the Y-axis flap to flip forward or return to its original position. It also includes an auxiliary slide rail, an auxiliary slider, and a Y-axis drive mechanism. The auxiliary slider is arranged parallel to the X-axis slide rail and is slidably mounted on the auxiliary slide rail. The Y-axis drive mechanism is connected to the auxiliary slider and is used to drive the auxiliary slider to expand or contract. A Z-axis cylinder is arranged on the auxiliary slider along the Z-axis direction. A Z-axis slider is arranged at the front end of the piston rod of the Z-axis cylinder. A Z-axis flipping cylinder is arranged on the Z-axis slider. A Z-axis flip plate is hinged to the Z-axis slider. The Z-axis flipping cylinder is hinged to the rear end of the Z-axis flip plate. The extension and retraction of the Z-axis flipping cylinder is used to drive the front end of the Z-axis flip plate to flip forward or return to its original position. The X-axis drive mechanism drives the trapezoidal support plate on the X-axis slider to open inside the paper bag and form a folding platform. The Z-axis flip plate slides along the auxiliary slide rail and performs an initial 90° fold on the short side of the paper bag. After the trapezoidal support plate on the X-axis slider is reset, the Z-axis flip plate is driven by the Z-axis flip cylinder to perform a final 180° fold on the short side. After the short side of the paper bag is folded, the Y-axis flip cylinder drives the Y-axis flip plate to perform a 180° fold on the long side of the paper bag.

8. A paper bag punching, drawstring threading, and bag-closing machine according to claim 7, characterized in that: It also includes a punching assembly and a fourth suction cup assembly. The punching assembly is disposed at the punching station on the frame, and the fourth suction cup assembly is disposed on both sides of the conveyor belt at the punching station. The fourth suction cup assembly is used to suction and open the sides of the paper bag. The punching assembly includes a punching slide rail, a punching slider, a punching drive mechanism, and a punching clamp. The punching slide rail is vertically disposed on the frame, the punching slider is slidably disposed on the punching slide rail, the punching drive mechanism is connected to the punching slider and drives the punching slider to move up and down, and the punching clamp is disposed on the punching slider and is used to clamp the paper bag before punching.

9. A paper bag punching, drawstring threading, and bag-closing machine according to claim 8, characterized in that: It also includes a base plate assembly and a fifth suction cup assembly. The base plate assembly is disposed on the base plate station on the frame, and the base plate station is located at the rear end of the punching station. The fifth suction cup mechanism is disposed on both sides of the conveyor belt on the base plate station. The fifth suction cup mechanism is used to suction and open the sides of the paper bag. The base plate assembly includes a base plate slide rail, a base plate slider, a base plate drive mechanism, and a base plate suction cup. The base plate slide rail is vertically disposed on the frame. The base plate slider is slidably disposed on the base plate slide rail. The base plate drive mechanism is drivenly connected to the base plate slider and drives the base plate slider to move up and down. The base plate suction cup is disposed on the side of the base plate slider and is used to suction the base plate and place the base plate at the bottom of the paper bag.

10. A paper bag punching, drawstring threading, and bag opening machine according to claim 9, characterized in that: It also includes a dispensing assembly and a sixth suction cup assembly. The dispensing assembly is located at the dispensing station on the frame, which is located at the front end of the rope threading station. The sixth suction cup mechanism is located on both sides of the conveyor belt at the dispensing station. The sixth suction cup mechanism is used to suction and open the two sides of the paper bag. The dispensing assembly includes a dispensing slide rail, a dispensing drive mechanism, a dispensing slider, a dispensing cylinder, and a dispensing nozzle. The dispensing slider is slidably mounted on the dispensing slide rail. The dispensing drive mechanism is connected to the dispensing slider and is used to drive the dispensing slider to slide horizontally. The dispensing cylinder is mounted on the dispensing slider. The dispensing nozzle is located at the front end of the piston rod of the dispensing cylinder. The dispensing nozzle is used to dispense glue in a dotted pattern at the fixed position of the flat rope inside the opening of the paper bag.

Images