A bagging machine

Abstract

The application discloses a bagging bag processing edge-pressing and packaging equipment, and relates to the technical field of bagging bag processing, which comprises, arranged in sequence along the film conveying direction: a unwinding mechanism for intermittently releasing the film; a former for guiding the film to form a bag body sketch; and a hot-pressing mechanism arranged downstream of the former and comprising two oppositely arranged hot-pressing components. The application sets the proportional relationship between the hot-pressing frequency and the traction frequency, and alternately changes the cutting position, fundamentally solving the core problem of the traditional equipment that produces no-opening waste bags due to precision deviation. In the production process, even if the equipment has certain fixed-length or alignment errors, since the cutting action alternately occurs between the central part of the bag body and the central part of the transverse sealing area, each error will only affect the symmetry of a single bag opening or the size of the bag bottom excess edge, but will not produce a completely no-opening bag body, thereby greatly improving the fault tolerance and production stability of the equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the packaging bag processing technical field, specifically to a packaging bag processing edge pressing and packaging equipment. BACKGROUND

[0002] The automatic production of packaging bags, especially the vertical bag making, usually involves continuous or intermittent processes such as unwinding, forming, hot pressing and sealing, length traction and cutting. In the common equipment layout, the film is guided to form a cylindrical or folded bag body after unwinding by the former, and then the side (longitudinal seal) and bottom, top (transverse seal) are heated and sealed by the hot pressing mechanism, and then the film is intermittently pulled by the traction mechanism, and finally cut at the preset position to obtain a single empty bag. Among them, the relative relationship between the transverse sealing and cutting positions directly determines the formation of the bag opening and the integrity of the bag body.

[0003] At present, most of the equipment adopts the scheme of single position cutting at the boundary between the two adjacent transverse seals. As shown in Figure 11 , under this scheme, each cutting action separates two bags at the same time: the bottom edge of the upper bag and the top edge of the lower bag are formed by the same transverse seal, and the cutting line is located at the boundary of the transverse seal. This design puts high requirements on the mechanical synchronization accuracy of the equipment, the film traction length accuracy, and the alignment accuracy of the transverse sealing and cutting mechanisms. In actual production, especially during commissioning or after a long time of operation, any small systematic deviation may cause the cutting position to deviate from the preset boundary. If the cutting position deviates to the side of the predetermined bag opening (as shown in Figure 12 , the cutting seam deviates to the opening side), it will cause the actual effective length of the bag body to be shortened, the volume to be reduced, and excess waste edges to be generated on the transverse seal side, affecting the appearance and causing material waste; more seriously, if the cutting position deviates to the transverse seal side, it may cause both sides of the cut bag body to be closed by the transverse seal, that is, the produced bag has no opening (as shown in Figure 12 , the cutting seam deviates to the transverse seal side, and both ends of the bag body after cutting are in a transverse seal state), becoming a waste product that cannot be used, causing production interruption and economic loss. Therefore, an improved scheme with higher fault tolerance and capable of stably producing qualified bag bodies is urgently needed. SUMMARY

[0004] The purpose of the present application is to provide a packaging bag processing edge pressing and packaging equipment, which improves the fault tolerance of the equipment, reduces the requirements for traction and alignment accuracy, and avoids the production of waste bags without openings through the innovative process of alternately cutting the middle part of the bag body and the middle part of the transverse seal.

[0005] To solve the above technical problems, the technical scheme adopted by the present application is:

[0006] The utility model provides a kind of edge pressing and packaging equipment for packaging bag processing, including machine box;It further includes successively arranged along the film conveying direction: unwinding mechanism, for intermittent release film;Former, for guiding film to form bag body rudiment;Hot pressing mechanism, it is arranged downstream of former, including two hot pressing components being oppositely arranged, each hot pressing component is provided with mutually perpendicular and fixedly connected longitudinal seal plate and horizontal seal plate, two hot pressing components can move towards each other, to be sealed by longitudinal seal plate and be sealed by horizontal seal plate in horizontal seal position by hot pressing bag body rudiment's side edge;Pinch roll group, it is arranged downstream of hot pressing mechanism, for intermittent traction with fixed bag length as traction amount;Cutting mechanism, it is arranged downstream of hot pressing mechanism, cutting mechanism is configured to be carried out once cutting after each traction of pinch roll group;The working frequency of hot pressing mechanism is the traction frequency of pinch roll group half.

[0007] Adopt the above technical scheme, by setting the ratio relationship of hot pressing frequency and traction frequency, and alternately changing cutting position, the core problem that traditional equipment causes no opening waste bag due to precision deviation is fundamentally solved;During production, even if the equipment has certain fixed length or alignment error, since cutting action alternately carries out between the central part of bag body and the central part of horizontal seal area, each error will only affect the symmetry of single bag opening or the size of bag bottom excess edge, but will not produce completely no opening bag body, so that the fault tolerance and production stability of equipment are greatly improved, the debugging difficulty and waste rate are reduced, and production cost is saved.

[0008] Further improvement of the technical scheme of the application is that the cutting mechanism includes a lifting assembly, a pushing assembly, a shearing assembly, and a punching assembly; the lifting assembly is installed on one side of the machine box, and the output end of the lifting assembly is fixedly connected with a lifting frame; the shearing assembly and the punching assembly are arranged side by side on the lifting frame; the lifting assembly drives the shearing assembly and the punching assembly to lift as a whole, and the pushing assembly drives the assembly at the same height as the pushing assembly to perform the cutting action; the pushing assembly includes two second fixed plates fixedly connected to the side wall of the machine box, and each of the two second fixed plates is fixedly connected with a pushing cylinder on the side away from the other; the piston rod of the pushing cylinder extends to the other side of the second fixed plate and is fixedly connected with a pushing block.

[0009] According to the technical scheme, the cutting mechanism integrating lifting switching and pushing driving is designed, the cutting mode can be switched according to the cutting position, and therefore the cutting effect is improved. The function-specific shearing assembly and the punching assembly are integrated side by side in the up-down direction, the overall quick transposition of the two assemblies is realized through a lifting assembly, and a fixed-position pushing assembly provides unified power. The design enables the equipment to automatically switch between the shearing soft mode and the cutting hard mode seamlessly according to the process rhythm, perfectly matches the requirements of the alternate cutting process, guarantees the optimal cutting quality in the two cases, realizes the sharing of the power source and the compactness of the structure, and improves the reliability and response speed of the equipment.

[0010] Further improvement of the technical scheme of the present application is that the shearing assembly comprises a mounting column fixedly connected to the inner side of the lifting frame, an installation seat is fixedly connected to the outer side of the mounting column, two shearing blades are symmetrically hinged to the inner side of the installation seat, and a strip-shaped slot is formed in each shearing blade; first guide rods are symmetrically fixedly connected to the two sides of the lifting frame, first stress plates are slidingly connected between the first guide rods on the same side of the lifting frame, first push-pull rods are symmetrically slidingly connected to the two sides of the lifting frame, one end of each first push-pull rod is fixedly connected to a corresponding first stress plate, the other end of each first push-pull rod extends to the inside of the lifting frame and is fixedly connected to a transmission pin, and the transmission pin is slidingly connected to the strip-shaped slot; and first springs are sleeved around the outer sides of the first guide rods and between the first stress plates and the lifting frame.

[0011] According to the technical scheme, the bionic scissors assembly which is symmetrically hinged and driven by linear motion is provided, the precise synchronous shearing of the double-layer film is perfectly realized, the linear motion of pushing is converted into the opposite rotary motion of the two shearing blades by using the simple lever principle, the symmetric design ensures that the forces acting on the two layers of film are simultaneous, equal and opposite pure shearing forces, and the possibility of film misalignment is fundamentally eliminated.

[0012] Further improvement of the technical scheme of the present application is that the punching assembly comprises second guide rods symmetrically fixedly connected to the two sides of the lifting frame, second stress plates are slidingly connected to the outer sides of the second guide rods, second push-pull rods are symmetrically slidingly connected to the two sides of the lifting frame, one end of each second push-pull rod is fixedly connected to a corresponding second stress plate, the other end of each second push-pull rod extends to the inside of the lifting frame and is fixedly connected to a mounting plate, a cutting knife is connected to one of the mounting plates through a screw, and an anvil is connected to the other mounting plate through a screw, and second springs are sleeved around the outer sides of the second guide rods and between the second stress plates and the lifting frame.

[0013] The technical scheme is characterized in that the punching mode of the punch and the anvil is adopted, the punch is driven by the thrust force to impact and cut the hardened sealing edge between the punch and the anvil at a high speed, a clean and flat brittle fracture surface can be generated, the guide rod and the second spring arranged in the assembly ensure the straightness and automatic reset of the punching action, the notch quality is optimized, the impact energy is effectively absorbed, the driving mechanism is protected, and the service life of the cutter is prolonged.

[0014] Further improvement of the technical scheme of the present application is that a through hole is formed in each of the first stress plate and the second stress plate, a pressing rod is slidably connected in the through hole, one end of the pressing rod is fixedly connected with a limiting head, the end of the pressing rod away from the limiting head is fixedly connected with a pressing plate, the end of the pressing plate away from the pressing rod is fixedly connected with a rubber pad, and a pressing spring is sleeved outside the pressing rod and between the pressing plate and the second stress plate.

[0015] The technical scheme is characterized in that the pressing mechanism is integrally arranged on the stress plate, the problem of material stability during cutting is solved, the flexible pressing force is provided by the pressing spring, the friction is increased by the rubber pad to protect the film surface, the film is completely and non-damagedly pressed on the anvil or the working surface before the shear blade is closed or the punch impacts, the risk of material slip is fundamentally eliminated, and the position accuracy and edge quality of the cutting notch are significantly improved.

[0016] Further improvement of the technical scheme of the present application is that a recess is formed in each of the first stress plate and the second stress plate, an inner friction seat is connected in the recess through a screw, a friction rod is detachably connected to the side of the pressing plate away from the rubber pad, and the end of the friction rod away from the pressing plate penetrates through the inner friction seat.

[0017] The technical scheme is characterized in that the stepwise friction rod is arranged in the pressing mechanism and cooperates with the inner friction seat, the last stage of the pressing plate reset movement automatically generates an effective "end shaking", the shaking is specially used to destroy the electrostatic adsorption force to ensure reliable falling of the bag body, and the core advantage is that the shaking only occurs at the end of the pressing plate completely separated from the film and the reset stroke, and the extension section (thin diameter section) of the friction rod is not in contact with the inner friction seat during the process of the pressing plate advancing to press the film, so that the movement is stable without any shaking, and the accuracy and stability of the pressing action are absolutely ensured.

[0018] Further improvement of the technical scheme of the present application is that the hot pressing mechanism comprises two first fixed plates fixedly connected to one side of the cabinet, a first sliding rod fixedly connected between the sides close to each other of the two first fixed plates, two first push plates symmetrically and slidably connected to the outside of the first sliding rod, a pressure edge cylinder fixedly connected to each side of the first fixed plate away from the sliding rod, a piston rod of the pressure edge cylinder extending to the other side of the first fixed plate and fixedly connected with the first push plate, and the longitudinal sealing plate and the transverse sealing plate are both fixedly connected to the side wall of the first push plate, and the longitudinal sealing plate and the transverse sealing plate form an L-shaped structure.

[0019] By adopting the above technical scheme, the split symmetrical L-shaped hot pressing mechanism is adopted, and through the unique mechanical layout and movement mode, efficient, accurate and stable synchronous double-side heat sealing is realized, the two opposite moving and mirror image L-shaped heat sealing plates are used, the side edge longitudinal sealing and the bottom / top transverse sealing of the bag body can be simultaneously completed in one mold closing action, the production efficiency is high, and the continuity and sealing reliability of the longitudinal sealing and the transverse sealing at the corner are ensured.

[0020] Further improvement of the technical scheme of the present application is that the heat sealing length of the longitudinal sealing plate is set to be greater than twice the fixed bag length.

[0021] By adopting the above technical scheme, through the above design, when the equipment performs hot pressing with a period of twice the bag length, a small and controlled overlapping part can be ensured between the sealing areas formed on the film side edge by adjacent two times of hot pressing. The primary effect of this small overlap is to provide absolute reliable sealing guarantee, which as a safety margin effectively eliminates the sealing discontinuity or gap that may be caused by the inevitable small errors in film traction, mechanical transmission or alignment, thereby completely preventing side leakage.

[0022] Due to the adoption of the above technical scheme, the present application has the following technical effects compared with the prior art:

[0023] 1. The present application provides a pressure edge sealing equipment for packaging bag processing, which fundamentally solves the core problem of traditional equipment that no opening waste bag is produced due to precision deviation by setting the proportional relationship of hot pressing frequency and traction frequency and alternately changing the cutting position; during production, even if the equipment has certain fixed length or alignment error, since the cutting action is alternately performed between the center of the bag body part and the center of the transverse sealing area, each error will only affect the symmetry of a single bag opening or the size of the bag bottom excess edge, but will not produce a completely opening-free bag body, thereby greatly improving the fault tolerance and production stability of the equipment, reducing the debugging difficulty and waste rate, and saving the production cost.

[0024] 2.The present application provides a packaging bag processing edge sealing equipment, by designing the cutting mechanism integrated with lifting switching and pushing driving, the cutting mode can be switched according to the cutting position, thereby improving the cutting effect. The mechanism integrates the function-specific shearing assembly and the punching assembly in parallel, realizes the overall quick transposition of the two through a lifting assembly, and provides unified power by using a fixed position pushing assembly. This design enables the equipment to automatically switch between the soft cutting and hard cutting modes seamlessly according to the process rhythm, not only perfectly matches the requirements of the alternating cutting process, ensures the optimal cutting quality in both cases, but also realizes the sharing of power source and the compactness of structure, improves the reliability and response speed of the equipment.

[0025] 3.The present application provides a packaging bag processing edge sealing equipment, by setting the symmetrical hinge, the bionic scissors assembly driven by linear motion, the precise synchronous shearing of the double-layer film is perfectly realized. The assembly uses the simple lever principle to convert the linear motion of pushing into the opposite rotary motion of the two cutting edges, and the symmetrical design ensures that the force acting on the two layers of film is simultaneous, equal and opposite pure shearing force, which fundamentally eliminates the possibility of film misplacement.

[0026] 4.The present application provides a packaging bag processing edge sealing equipment, by integrating the pressing mechanism on the stress plate, the problem of material stability during cutting is solved. The mechanism uses the pressing spring to provide flexible pressing force, and increases friction through rubber pad to protect the film surface, ensuring that the film is completely and damage-free pressed on the anvil or working surface before the cutting edge is closed or the cutting knife impacts, which fundamentally eliminates the risk of material slip and significantly improves the position accuracy and edge quality of the cutting.

[0027] 5.The present application provides a packaging bag processing edge sealing equipment, by setting the step friction rod in the pressing mechanism and cooperating with the inner friction seat, it skillfully uses the last stage of the pressing plate reset motion to automatically generate an effective "end shaking", which is specifically used to destroy the electrostatic adsorption force to ensure the reliable falling of the bag body. The core advantage is that the shaking only occurs at the end of the pressing plate completely separated from the film, and in the process of pressing the film, the extension section (thin section) of the friction rod has no contact with the inner friction seat, so the movement is smooth without any shaking, which absolutely guarantees the precision and stability of the pressing action. BRIEF DESCRIPTION OF DRAWINGS

[0028] The present application will be further described below in conjunction with the drawings.

[0029] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present application;

[0030] Figure 2 It is a structure schematic diagram of the first perspective view of the cutting mechanism of the present application;

[0031] Figure 3 This is a schematic diagram of the cutting mechanism of the present invention from a second perspective;

[0032] Figure 4 This is one of the cross-sectional structural schematic diagrams of the cutting mechanism of the present invention;

[0033] Figure 5 This is a schematic diagram of the shearing component of the present invention;

[0034] Figure 6 This is a second cross-sectional structural schematic diagram of the cutting mechanism of the present invention;

[0035] Figure 7 This is a schematic diagram of the installation structure of the pressure plate and friction rod of the present invention;

[0036] Figure 8 This is a schematic diagram of the shear blade structure of the present invention;

[0037] Figure 9 This is a schematic diagram showing the disassembled structure of the friction rod and the inner friction seat of the present invention;

[0038] Figure 10 For the present invention Figure 6 Enlarged view of point A in the middle;

[0039] Figure 11 A diagram illustrating the problems existing in the prior art;

[0040] Figure 12 for Figure 11 Enlarged view at point B in the middle;

[0041] Figure 13 This is a schematic diagram of the improved solution.

[0042] In the diagram: 1. Chassis; 2. Unwinding mechanism; 3. Forming device; 4. Hot pressing mechanism; 401. First fixing plate; 402. First sliding rod; 403. Edge pressing cylinder; 404. First push plate; 405. Longitudinal sealing plate; 406. Transverse sealing plate; 5. Pinch roller group; 6. Cutting mechanism; 61. Lifting assembly; 611. Slide block; 612. Lifting cylinder; 613. Slide rail; 614. Lifting frame; 620. Mounting column; 621. First guide rod; 622. First force plate; 623. First push-pull rod; 624. Installation... 625. Mounting base; 626. Scissors blade; 627. First spring; 628. Strip groove; 631. Transmission pin; 632. Second guide rod; 633. Second force plate; 634. Second push-pull rod; 635. Cutting knife; 636. Anvil; 701. Second spring; 702. Pressing rod; 703. Pressure plate; 704. Pressing spring; 705. Limiting head; 81. Friction rod; 811. Extension section; 812. Friction section; 802. Inner friction seat; 803. Groove; 901. Second fixing plate; 902. Push cylinder. Detailed Implementation

[0043] The present invention will be further described in detail below with reference to the embodiments.

[0044] Example 1

[0045] like Figures 1-13 As shown, the present invention provides a sealing device for processing packaging bags, including a housing 1; and further including, arranged sequentially along the film conveying direction: an unwinding mechanism 2 for intermittently releasing the film; a forming device 3 for guiding the film to form a bag body shape; a hot pressing mechanism 4, located downstream of the forming device 3, including two hot pressing components arranged opposite each other, each hot pressing component having a longitudinal sealing plate 405 and a transverse sealing plate 406 that are perpendicular to each other and fixedly connected, the two hot pressing components being able to move towards each other to hot-press and seal the side of the bag body shape through the longitudinal sealing plate 405, and to hot-press and seal at the transverse sealing position through the transverse sealing plate 406; a clamping roller group 5, located downstream of the hot pressing mechanism 4, for intermittently pulling with a fixed bag length as the traction amount; and a cutting mechanism 6, located downstream of the hot pressing mechanism 4, the cutting mechanism 6 being configured to perform a cutting once after each traction of the clamping roller group 5; the operating frequency of the hot pressing mechanism 4 is half the traction frequency of the clamping roller group 5.

[0046] For every two traction operations of the pinch roller group 5, the hot pressing mechanism 4 performs one hot pressing action; thus, along the film conveying direction, two bag lengths are spaced between two adjacent transverse sealing positions to form a bag body area. The cutting position is alternately set at the center of this area and the center of the transverse sealing position. That is to say, when cutting the central area of ​​the bag body area, two bag openings will be formed, and when cutting the transverse sealing area, two bag bottoms will be formed.

[0047] Wherein, the fixed bag length is the length of the whole single packaging bag to be produced.

[0048] In this embodiment, by setting the proportional relationship of the heat pressing frequency and the traction frequency, and alternating the cutting position, the core problem of the traditional equipment that the precision deviation leads to the production of no opening waste bag is fundamentally solved; In the production process, even if the equipment has certain fixed length or alignment error, since the cutting action is alternately performed between the "central part of the bag body" and the "central part of the horizontal sealing area", each error will only affect the symmetry of the single bag opening or the size of the bag bottom edge, but it will never produce a completely no opening bag body, thereby greatly improving the fault tolerance and production stability of the equipment, reducing the debugging difficulty and waste rate, and saving the production cost.

[0049] When working, the control equipment is started, the film is intermittently released from the unwinding mechanism 2, the bag body is formed into a rough shape through the former 3, and the pinch roller group 5 is intermittently pulled with a fixed bag length L as the period; The key is that the working frequency of the heat pressing mechanism 4 is set to be half of the traction frequency of the pinch roller group 5, that is, the heat pressing mechanism 4 performs a heat sealing action once every two traction actions of the pinch roller group 5, which makes the distance between the adjacent two horizontal sealing positions in the film conveying direction be exactly two bag lengths (2L), forming a "bag body part area" containing two future bag lengths. The cutting mechanism 6 performs cutting after each traction, but the cutting position relative to the bag body is not fixed (its own position is fixed, but the relative continuously pulled bag body is constantly switched position): it alternately selects between the central part of the horizontal sealing position formed last time and the central part of the current "bag body part area". Specifically, when the cutting occurs at the central part of the "bag body part area", it will divide this area into two, thereby forming an opening for the upper and lower two bag bodies respectively; and when the cutting occurs at the central part of the horizontal sealing position, the horizontal sealing is cut in half, thereby forming a bag bottom for the upper and lower two bag bodies respectively, as shown in Figure 13 So on and so forth, the complete bag body is continuously produced.

[0050] Embodiment 2

[0051] As Figure 2 , Figure 3 and Figure 4As shown, on the basis of embodiment 1, the present application provides a technical scheme: preferably, the cutting mechanism 6 comprises a lifting assembly 61, a pushing assembly, a shearing assembly and a punching assembly; the lifting assembly 61 is installed on one side of the cabinet 1, and the output end of the lifting assembly 61 is fixedly connected with a lifting frame 614; the shearing assembly and the punching assembly are arranged in parallel on the lifting frame 614; the lifting assembly 61 is used to drive the shearing assembly and the punching assembly to lift integrally, and the pushing assembly is used to drive the assembly of the same height as the pushing assembly to perform a cutting action; the pushing assembly comprises two second fixed plates 901 fixedly connected to the side wall of the cabinet 1, and the second fixed plates 901 are fixedly connected with pushing cylinders 902 on the sides away from each other, and the piston rods of the pushing cylinders 902 extend to the other sides of the second fixed plates 901 and are fixedly connected with pushing blocks.

[0052] Among them, the pinch roll group 5 includes two pinch rollers rotatably connected to the cabinet 1, the center shafts of the two pinch rollers are fixedly connected with transmission gears, and the two transmission gears are meshed with each other, a pinch motor is fixedly connected inside the cabinet 1, the output end of the pinch motor is fixedly connected with a drive gear, and the drive gear is meshed and connected with one of the transmission gears; the unwinding mechanism 2 is a structure for releasing film in the existing vertical bag making machine, which is a mature existing technology, so it is not described in detail.

[0053] According to the device program setting, the cutting position height is always unchanged, and the cutting mechanism 6 controls the shearing assembly and the punching assembly to move to the cutting height through the lifting assembly 61, so as to perform the corresponding cutting action; specifically, the lifting assembly 61 is configured to drive the shearing assembly and the punching assembly to lift integrally, when the active end of the lifting assembly 61 is at the highest position of its stroke, the shearing assembly moves to the cutting position, at this time the pushing block is opposite to the shearing assembly; when the lifting assembly 61 is at the lowest position of its stroke, the punching assembly moves to the cutting position, at this time the pushing block is opposite to the punching assembly; wherein the pushing driving assembly is configured to: when the shearing assembly is at the cutting position, the shearing assembly is driven to perform shearing on the bag body through the pushing action, forming two openings of the bag body; when the punching assembly is at the cutting position, the punching assembly is driven to perform punching action on the transverse seal, forming two bag bottoms of the bag body;

[0054] Among them, the lifting assembly 61 comprises a sliding seat 611, a lifting cylinder 612 fixedly connected to the top of the sliding seat 611, and a sliding rail 613 fixedly connected to the sliding seat 611, wherein the lifting frame 614 is slidingly connected to the sliding rail 613, and the piston rod of the lifting cylinder 612 is fixedly connected with the lifting frame 614.

[0055] The alternative cutting process in the above scheme requires the equipment to accurately perform two completely different cutting tasks: one is to cut off the middle part of the double-layer film which is soft and prone to misalignment to form a bag opening, and the other is to cut off the transversely sealed part which has been hardened by heat pressing to form a bag bottom. It needs to be particularly noted that when cutting the soft film, it is easy to cause misalignment of the two layers of film due to pulling, resulting in uneven bag opening or failure to separate. The transversely sealed part is relatively hardened due to heat pressing, and is suitable for punching, so it is necessary to provide a cutting mechanism 6 capable of performing these two different cutting actions.

[0056] In the present embodiment, by designing the cutting mechanism 6 which integrates lifting switching and pushing driving, the cutting mode can be switched according to the cutting position, thereby improving the cutting effect. The mechanism integrates the function-specific shearing assembly and punching assembly side by side, realizes the overall quick transposition of the two by a lifting assembly 61, and then provides unified power by a fixed-position pushing assembly. This design enables the equipment to automatically switch between the "cutting soft" and "cutting hard" modes seamlessly according to the process rhythm, not only perfectly matches the requirements of the alternative cutting process and ensures the optimal cutting quality in both cases, but also realizes the sharing of power source and the compactness of structure, thereby improving the reliability and response speed of the equipment.

[0057] The core of the cutting mechanism 6 is the lifting assembly 61 installed on the fixed mounting frame, and the output end of the lifting assembly 61 is connected to a lifting frame 614 which can move up and down. The shearing assembly and the punching assembly are fixedly installed side by side on the lifting frame 614. When working, the control system of the equipment issues instructions according to the process sequence (i.e. whether the next bag opening or bag bottom should be cut). When the middle part of the film needs to be cut to form a bag opening, the driving source (such as a motor or a pneumatic cylinder) of the lifting assembly 61 acts to drive the lifting frame 614 to drive the shearing assembly and the punching assembly on it to rise integrally until the shearing assembly reaches the preset cutting height position. At this time, the push block in front of the piston rod of the pushing assembly fixed on the side wall of the machine box 1 is just aligned with the stress position on the shearing assembly. The pushing cylinder 902 extends, and the piston rod of the pushing cylinder 902 drives the push block to move forward, thereby driving the shearing assembly to perform a complete shearing action. Conversely, when the transverse seal needs to be punched to form a bag bottom, the lifting assembly 61 drives the entire cutting unit to descend, so that the punching assembly reaches the same cutting height. At this time, the push block will be aligned with the stress position of the punching assembly, and the extension of the pushing cylinder 902 will drive the punching action.

[0058] There are two cutting modes in the scheme, and the corresponding lifting assembly 61 has two pre-set positions, and the two positions are switched alternately, so the control logic does not need to design a complex judgment, and only needs to complete the alignment calibration at the beginning.

[0059] As Figure 6 , Figure 8 and Figure 10As shown, in the embodiment, preferably, the shearing assembly comprises a mounting column 620 fixedly connected to the inner side of the lifting frame 614, an outer side of the mounting column 620 is fixedly connected with a mounting seat 624, two shearing blades 625 are symmetrically hinged to the inner side of the mounting seat 624, and a strip-shaped slot 627 is formed in each of the shearing blades 625; the two sides of the lifting frame 614 are symmetrically fixedly connected with first guide rods 621, first stress plates 622 are slidingly connected between the first guide rods 621 located at the same side of the lifting frame 614, first push-pull rods 623 are symmetrically slidingly connected to the two sides of the lifting frame 614, one end of each of the first push-pull rods 623 is fixedly connected with a first stress plate 622, the other end of each of the first push-pull rods 623 extends to the inside of the lifting frame 614 and is fixedly connected with a transmission pin 628, and the transmission pin 628 is slidingly connected with the strip-shaped slot 627; and the outer side of each of the first guide rods 621 and between the first stress plate 622 and the lifting frame 614 is sleeved with a first spring 626.

[0060] In the embodiment, the shearing assembly is symmetrically hinged and driven by linear motion, which perfectly realizes the precise and synchronous shearing of the double-layer film. The shearing assembly uses the simple lever principle to convert the linear motion of the pushing into the opposite rotary motion of the two shearing blades 625, and the symmetric design ensures that the force acting on the two layers of film is a pure shearing force which is simultaneous, equal and opposite in direction, which fundamentally eliminates the possibility of film misplacement.

[0061] When the lifting assembly 61 moves the shearing assembly to the working position and the push block of the pushing assembly moves forward, it first abuts against and pushes the first stress plate 622, and the first stress plate 622 slides to the inner side of the mounting frame along the first guide rod 621 against the resistance of the first spring 626. The motion of the first stress plate 622 is transmitted to the transmission pin 628 located in the inside of the lifting frame 614 through the first push-pull rod 623 fixedly connected therewith, and the transmission pin 628 moves linearly. Since the transmission pin 628 is nested in the strip-shaped slot 627 of the two shearing blades 625, the linear motion of the transmission pin 628 is constrained by the inclined surface of the strip-shaped slot 627 and converted into a torque acting on the shearing blades 625. The torque forces the two shearing blades 625, which are symmetrically arranged around the hinge shaft, to move in opposite directions, like closing the scissors with fingers, so as to cleanly cut the double-layer film between the blade edges. When the push block of the pushing assembly is withdrawn, the compressed first spring 626 releases energy to push the first stress plate 622, the first push-pull rod 623 and the transmission pin 628 to reset as a whole. The reverse motion of the transmission pin 628 in the strip-shaped slot 627 drives the two shearing blades 625 to rotate in the opposite direction, and automatically opens to the initial position, completing a working cycle.

[0062] As Figure 3 , Figure 6 and Figure 7As shown, in the embodiment, preferably, the punching assembly comprises second guide rods 631 fixedly connected symmetrically on both sides of the lifting frame 614, second force plates 632 slidingly connected outside the second guide rods 631, second push-pull rods 633 slidingly connected symmetrically on both sides of the lifting frame 614, one end of each second push-pull rod 633 being fixedly connected with a second force plate 632, the other end extending to the inside of the lifting frame 614 and being fixedly connected with a mounting plate (not marked in the figure, connected on the second push-pull rod 633, for mounting the cutting knife 634 and the anvil 635), one mounting plate being connected with the cutting knife 634 through a screw, and the other mounting plate being connected with the anvil 635 through a screw, and a second spring 636 being sleeved outside the second guide rod 631 and between the second force plate 632 and the lifting frame 614.

[0063] In the embodiment, the punching mode of the cutting knife 634 and the anvil 635 is adopted, the cutting knife 634 is driven by the thrust force to impact and cut the hardened seal edge between the cutting knife 634 and the anvil 635 instantaneously at high speed, a clean and flat brittle fracture surface can be generated, the guide rod and the second spring 636 arranged in the assembly ensure the straightness precision and automatic reset of the punching action, the cutting quality is optimized, the impact energy is effectively absorbed, the driving mechanism is protected, and the service life of the cutting tool is prolonged.

[0064] When the lifting assembly 61 drives the punching assembly to move to the working position, the thrust block of the thrust assembly is controlled to move forward, abut against and push the second force plate 632, the second force plate 632 slides inward along the guide of the second guide rod 631 against the resistance of the second spring 636, the second push-pull rod 633 fixedly connected with the second force plate 632 moves inward synchronously, the mounting plate at the end of the second push-pull rod 633 moves, so that the cutting knife 634 and the anvil 635 fixed on the mounting plate move at high speed to one side, the film hardened transverse seal part between the cutting knife 634 and the anvil 635 is cut off by the high-energy impact in this moment, and the bag bottom of two bag bodies is formed. After the punching action is completed, the thrust assembly is withdrawn, the second spring 636 is released, and the second force plate 632, the second push-pull rod 633, the cutting knife 634 (and the anvil 635) and the mounting plate are accurately withdrawn along the second guide rod 631 to the initial position, so as to be ready for the next punching.

[0065] Embodiment 3

[0066] As Figure 6 , Figure 7 and Figure 10As shown, on the basis of embodiment 2, the application provides a technical solution: preferably, a through hole is formed in the first stress plate 622 and the second stress plate 632, and a compression rod 701 is slidably connected in the through hole, one end of the compression rod 701 is fixedly connected with a limiting head 704, the end of the compression rod 701 away from the limiting head 704 is fixedly connected with a pressing plate 702, the end of the pressing plate 702 away from the compression rod 701 is fixedly connected with a rubber pad, and a pressing spring 703 is sleeved outside the compression rod 701 and between the pressing plate 702 and the second stress plate 632.

[0067] In the above solution, whether the soft double-layer film is sheared or the hardened transverse sealing part is punched, the cutting tool (the shear blade 625 or the cutting knife 634) will generate a transverse or longitudinal force on the material at the moment of contact. If the cutting material is not effectively constrained, the force will easily cause the film to slip, dislocate or even locally stretch and deform, thereby causing the cut to be skewed and the size to be inaccurate, which seriously affects the cutting precision and the bag forming quality.

[0068] In the embodiment, the problem of material stability at the moment of cutting is solved by integrally arranging the compression mechanism on the stress plate. The mechanism uses the pressing spring 703 to provide flexible compression force, and increases friction through the rubber pad to protect the film surface, so that the film is completely and non-damagedly compressed on the anvil plate 635 or the working surface before the shear blade 625 is closed or the cutting knife 634 is impacted, thereby fundamentally eliminating the risk of material slipping and significantly improving the position precision and edge quality of the cutting.

[0069] The compression mechanism cooperates with the cutting action to realize the sequence of pre-compression and cutting. When the push block of the push assembly moves forward and contacts and pushes the first stress plate 622 (for shearing) or the second stress plate 632 (for punching), the pressing plate 702 starts to slide along the guide rod and pushes the compression rod 701 to move through the pressing spring 703 until the pressing plate 702 and the rubber pad connected at the end thereof contact and compress the bag below. As the push block continues to advance, the pressing spring 703 will be gradually compressed and perform the above cutting action in the compression process. Since the film is firmly fixed at this time, the cutting precision is ensured. After the action is completed, the push block is withdrawn, and under the joint action of the return spring (the first spring 626 or the second spring 636) and the pressing spring 703, the compression mechanism and the cutting mechanism 6 are reset synchronously, the rubber pad is separated from the film, and the next cycle is prepared.

[0070] Embodiment 4

[0071] As Figure 5 , Figure 7 and Figure 9As shown, on the basis of Embodiment 3, the application provides a technical solution: preferably, the first stress plate 622 and the second stress plate 632 are both provided with a groove 803, the inside of the groove 803 is connected with an inner friction seat 802 through a screw, the side of the pressing plate 702 away from the rubber pad is detachably connected with a friction rod 81, and the end of the friction rod 81 away from the pressing plate 702 penetrates through the inner friction seat 802; the friction rod 81 comprises a friction section 812 and an extension section 811, the diameter of the friction section 812 matches the hole diameter of the center of the inner friction seat 802, the diameter of the extension section 811 gradually decreases from the end close to the friction section 812 to the end close to the pressing plate 702, and the outer wall of the friction section 812 and the inner wall of the inner friction seat 802 are both provided as rough surfaces.

[0072] In the high-speed automatic bag making process, static electricity is easily generated between the film (especially plastic film) and the rubber pad due to high-speed friction and contact separation. After cutting, the static adsorption force can cause the bag body or film waste edge to be tightly adhered to the rubber pad, which cannot be smoothly detached. This adhesion will interfere with the positioning and compression of the film next time, which may cause the bag body to wrinkle, positioning to be inaccurate, the film to be accumulated, the material to be jammed, or even the equipment to be stopped, seriously affecting the continuity and stability of production.

[0073] In this embodiment, by setting the stepwise friction rod 81 and the inner friction seat 802 in the compression mechanism, the last stage of the return movement of the pressing plate 702 automatically generates an effective "end shaking" once, which is specially used to destroy the static adsorption force to ensure that the bag body can be reliably detached. The core advantage lies in that the shaking only occurs at the end of the return stroke when the pressing plate 702 has completely separated from the film, and during the process of the pressing plate 702 advancing to compress the film, the extension section (thin diameter section) of the friction rod 81 has no contact with the inner friction seat 802, so the movement is smooth without any shaking, which absolutely guarantees the precision and stability of the compression action.

[0074] The key to realize this function is that the friction rod 81 is divided into two sections: the front section is the extension section 811 (thin diameter section) with smaller diameter, and the rear section is the friction section 812 (thick diameter section) with diameter matching the inner hole of the inner friction seat 802 and rough surface. When the pressing plate 702 performs the pressing action and moves forward, the friction rod 81 moves synchronously to the inner friction seat 802. Since the friction section 812 has not entered the inner friction seat 802 at this time, and the diameter of the extension section 811 is smaller than the hole diameter of the inner friction seat 802, there is a gap between them, so the whole pressing process is smooth and without shaking, which ensures the pressing accuracy. When the cutting is completed, the pressing plate 702 starts to retreat under the action of the pressing spring 703, and during most of the retreat stroke, the friction section 812 of the friction rod 81 has not yet entered the inner friction seat 802, and the movement is still smooth. Until the pressing plate 702 retreats close to the end of the stroke and completely leaves the film surface, the friction section 812 of the friction rod 81 begins to slide into the rough hole of the inner friction seat 802. Because of the close fit and rough surface, a sharply increasing sliding friction is generated, and a short and violent vibration (i.e. end shaking) is generated during the movement. This shaking is transmitted through the rubber pad, which can effectively shake off any film adsorbed by static electricity; then, the mechanism is completely reset, ready for the next cycle.

[0075] Embodiment 5

[0076] As Figure 1 shown, on the basis of embodiment 1, the application provides a technical solution: preferably, the hot pressing mechanism 4 comprises two first fixed plates 401 fixedly connected on one side of the cabinet 1, a first sliding rod 402 fixedly connected between the sides close to each other of the two first fixed plates 401, two first push plates 404 symmetrically and slidingly connected outside the first sliding rod 402, a pressure edge cylinder 403 fixedly connected on the side of each first fixed plate 401 away from the sliding rod, the piston rod of the pressure edge cylinder 403 extending to the other side of the first fixed plate 401 and fixedly connected with the first push plate 404, a longitudinal sealing plate 405 and a transverse sealing plate 406 fixedly connected on the side wall of the first push plate 404, one longitudinal sealing plate 405 and one transverse sealing plate 406 mounted on each first push plate 404, and the longitudinal sealing plate 405 and the transverse sealing plate 406 on the same first push plate 404 forming an L-shaped structure. The L-shaped structure formed by the mutually perpendicular and fixedly connected longitudinal sealing plate 405 and transverse sealing plate 406 is the hot pressing assembly. The hot pressing assembly is electrically connected with an external power supply device, and can generate heat through electric drive to meet the demand of film hot pressing edge sealing.

[0077] In the present embodiment, the scheme adopts a split-symmetrical L-shaped hot-pressing assembly, which realizes efficient, accurate and stable synchronous double-side heat sealing through its unique mechanical layout and movement mode. The scheme utilizes two mutually moving and mirror-image L-shaped heat-sealing plates to simultaneously complete the longitudinal sealing of the side edges and the horizontal sealing of the bottom / top of the bag body in one mold closing action, thereby achieving high production efficiency and ensuring the continuity and sealing reliability of the longitudinal and horizontal sealing at the corners.

[0078] When the control system issues a hot-pressing instruction, the edge-pressing cylinders 403 fixed on both sides of the frame simultaneously act, with their piston rods extending to push the first push plates 404 fixedly connected thereto. Each first push plate 404 is precisely slidably connected to the horizontal first slide rod 402 through a linear bearing or a bushing, thereby ensuring that its movement trajectory is a strict straight line. As the two first push plates 404 move towards each other, the longitudinal sealing plate 405 and the horizontal sealing plate 406 (which are fixedly connected in advance in an L-shaped structure) fixed to the inner sides thereof also move synchronously.

[0079] Preferably, the heat-sealing length of the longitudinal sealing plate 405 is set to be greater than twice the fixed bag length.

[0080] In the present embodiment, through the above design, when the equipment performs hot pressing with a period of twice the bag length, a small and controlled overlapping part can be ensured between the sealing areas formed on the film side edges by adjacent two hot pressings. The primary effect of this small overlap is to provide absolute reliable sealing guarantee, which effectively eliminates the sealing discontinuity or gap that may be caused by the inevitable small errors in film traction, mechanical transmission or alignment, thereby completely preventing side leakage.

[0081] Preferably, the length of the safety margin ranges from 0.5 to 3 mm. The overlapping area is much smaller than the large-area repeated hot-pressing area caused by the excessively long fixed sealing plate in the prior art, so that the side effects such as material thermal aging impact and appearance change are reduced to the lowest possible level, thereby ensuring the yield while maintaining the original performance and appearance of the sealing material.

[0082] The above has made a detailed description of the present application in general, but some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, the modifications or improvements without departing from the spirit and principles of the present application are within the protection scope of the present application.

Claims

1. A pressing and sealing device for processing packaging bags, comprising a machine casing (1); characterized in that, It also includes those arranged sequentially along the film conveying direction: Unwinding mechanism (2) is used for intermittently releasing the film; The forming device (3) is used to guide the film to form a bag body shape; The hot pressing mechanism (4) is located downstream of the forming device (3) and includes two hot pressing components arranged opposite to each other. Each hot pressing component is provided with a longitudinal sealing plate (405) and a transverse sealing plate (406) that are perpendicular to each other and fixedly connected. The two hot pressing components can move towards each other to hot press and seal the side of the bag body prototype through the longitudinal sealing plate (405) and hot press and seal it at the transverse sealing position through the transverse sealing plate (406). The pinch roller assembly (5) is located downstream of the hot pressing mechanism (4) and is used for intermittent traction with a fixed bag length as the traction amount; A cutting mechanism (6) is located downstream of the hot pressing mechanism (4), and the cutting mechanism (6) is configured to perform a cutting once after each traction of the pinch roller group (5); The operating frequency of the hot pressing mechanism (4) is half the traction frequency of the pinch roller group (5); The cutting mechanism (6) includes a lifting assembly (61), a pushing assembly, a shearing assembly, and a punching assembly; the lifting assembly (61) is installed on one side of the machine housing (1), and the output end of the lifting assembly (61) is fixedly connected to a lifting frame (614); the shearing assembly and the punching assembly are arranged side by side on the lifting frame (614); the lifting assembly (61) is used to drive the shearing assembly and the punching assembly to lift as a whole, and the pushing assembly is used to drive the component of the shearing assembly and the punching assembly at the same height to perform the cutting action; the pushing assembly includes two second fixing plates (901) fixedly connected to the side wall of the machine housing (1), and a pushing cylinder (902) is fixedly connected to the side of the two second fixing plates (901) that are far apart from each other, and the piston rod of the pushing cylinder (902) extends to the other side of the second fixing plate (901) and is fixedly connected to a push block.

2. The edge-pressing and sealing equipment for packaging bag processing according to claim 1, characterized in that: The shearing assembly includes a mounting column (620) fixedly connected to the inner side of the lifting frame (614), and a mounting base (624) fixedly connected to the outside of the mounting column (620). Two shear blades (625) are symmetrically hinged to the inner side of the mounting base (624), and each shear blade (625) has a slot (627). First guide rods (621) are symmetrically fixedly connected to both sides of the lifting frame (614), and a first guide rod (621) is slidably connected between the first guide rods (621) on the same side of the lifting frame (614). The force plate (622) and the lifting frame (614) are symmetrically slidably connected with first push-pull rods (623). One end of the first push-pull rod (623) is fixedly connected to the first force plate (622), and the other end extends into the interior of the lifting frame (614) and is fixedly connected with a transmission pin (628). The transmission pin (628) is slidably connected to the strip groove (627). The first guide rod (621) is external to the first force plate (622) and located between the first force plate (622) and the lifting frame (614) with a first spring (626).

3. The edge-pressing and sealing equipment for packaging bag processing according to claim 2, characterized in that: The punching assembly includes a second guide rod (631) symmetrically fixedly connected to both sides of the lifting frame (614). A second force plate (632) is slidably connected to the outside of the second guide rod (631). A second push-pull rod (633) is symmetrically slidably connected to both sides of the lifting frame (614). One end of the second push-pull rod (633) is fixedly connected to the second force plate (632), and the other end extends into the interior of the lifting frame (614) and is fixedly connected to a mounting plate. A cutter (634) is connected to one mounting plate by screws, and an anvil (635) is connected to the other mounting plate by screws. A second spring (636) is sleeved on the outside of the second guide rod (631) and between the second force plate (632) and the lifting frame (614).

4. The edge-pressing and sealing equipment for packaging bag processing according to claim 3, characterized in that: Both the first force-bearing plate (622) and the second force-bearing plate (632) have through holes. A clamping rod (701) is slidably connected inside each through hole. One end of the clamping rod (701) is fixedly connected to a limit head (704). The end of the clamping rod (701) away from the limit head (704) is fixedly connected to a pressure plate (702). The end of the pressure plate (702) away from the clamping rod (701) is fixedly connected to a rubber pad. A clamping spring (703) is sleeved outside the clamping rod (701) and between the pressure plate (702) and the second force-bearing plate (632).

5. The edge-pressing and sealing equipment for packaging bag processing according to claim 4, characterized in that: Both the first force plate (622) and the second force plate (632) are provided with grooves (803). The interior of the grooves (803) is connected to an inner friction seat (802) by screws. A friction rod (81) is detachably connected to the side of the pressure plate (702) away from the rubber pad. The end of the friction rod (81) away from the pressure plate (702) passes through the inner friction seat (802). The friction rod (81) includes a friction section (812) and an extension section (811). The diameter of the friction section (812) matches the size of the central hole of the inner friction seat (802). The diameter of the extension section (811) gradually decreases from the end near the friction section (812) to the end near the pressure plate (702). The outer wall of the friction section (812) and the inner wall of the inner friction seat (802) are both provided with rough surfaces.

6. The edge-pressing and sealing equipment for packaging bag processing according to claim 5, characterized in that: The hot pressing mechanism (4) includes two first fixing plates (401) fixedly connected to one side of the chassis (1). A first slide rod (402) is fixedly connected between the two first fixing plates (401) on the side that is close to each other. Two first push plates (404) are symmetrically slidably connected to the outside of the first slide rod (402). A pressing cylinder (403) is fixedly connected to the side of the two first fixing plates (401) away from the slide rod. The piston rod of the pressing cylinder (403) extends to the other side of the first fixing plate (401) and is fixedly connected to the first push plate (404). The longitudinal sealing plate (405) and the transverse sealing plate (406) are both fixedly connected to the side wall of the first push plate (404). The longitudinal sealing plate (405) and the transverse sealing plate (406) form an L-shaped structure.

7. The edge-pressing and sealing equipment for packaging bag processing according to claim 6, characterized in that: The heat-sealing length of the longitudinal sealing plate (405) is set to be more than twice the length of the fixed bag.

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