Bag preparation device of packaging machine

Abstract

The utility model discloses a bag preparation device of a packaging machine. The bag preparation device comprises a rack; the upper-layer bin bottom of each bag preparing bin is of a non-hollowed-out flat plate structure, and the upper-layer bin bottom of each bag preparing bin is independently connected with a lifting mechanism; the lifting mechanism comprises a vertically-arranged lead screw nut assembly, a driving motor and a plurality of vertical guide plates, the driving motor is fixedly connected with the lower-layer bin bottom, a nut of the lead screw nut assembly is fixedly arranged at the upper-layer bin bottom, and the bottom end of a lead screw is connected with an output shaft of the driving motor; a plurality of vertical guide plates are uniformly and fixedly arranged at the edge of the lower-layer bin bottom and are matched with the through holes or the grooves in the edge of the upper-layer bin bottom in a sliding and penetrating manner; the translation guide rail is horizontally fixed on the rack; and the bottoms of the two bag preparation bins are in sliding connection with the translation guide rail through sliding blocks. According to the device, the upper-layer bin bottom is driven by the lifting mechanism to ascend to keep the uppermost-layer prefabricated bags within the preset height of the bag suction mechanism, the number of the prefabricated bags capable of being stacked at a time is remarkably increased, the continuous operation time is prolonged, and shutdown is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of packaging machine bag preparation technology, and more specifically, this utility model relates to a bag preparation device for a packaging machine. Background Technology

[0002] In the field of pre-made bag packaging machinery, bag preparation devices are used to store stacks of pre-made bags and supply them to the bag suction mechanism. Existing bag preparation mechanisms typically employ a fixed bin structure with a hollow bottom composed of multiple parallel rods spaced apart for sliding. However, existing structures have the following inherent drawbacks: 1. Because the suction cup stroke of the bag suction mechanism is fixed, the bin bottom cannot be adjusted, and the total height of the stacked pre-made bags must not exceed the effective suction range of the suction cups. When the stacking height exceeds this limit, the bottom pre-made bags cannot be reliably suctioned, leading to interruption of bag supply. 2. Due to the limited stacking height, the number of pre-made bags placed at one time is relatively small. During continuous production, frequent bag replenishment is required, averaging once every 5-8 minutes. This not only increases operational intensity but also reduces the effective operating rate of the equipment. 3. For some single-bag preparation bin equipment, adding material requires pausing the equipment and manually moving the new stack of pre-made bags to the fixed bin position, resulting in frequent operation, time-consuming, and labor-intensive processes.

[0003] The aforementioned defects stem primarily from the following technical contradictions: While the perforated bottom of the compartment facilitates the movement of the rack and the pushing of bags, it cannot support the lifting mechanism. Increasing the single-stack capacity requires raising the compartment height, but this would exceed the working range of the suction cups. Increasing the suction cup stroke necessitates increasing the cylinder power, but this reduces the suction stability.

[0004] Therefore, there is an urgent need for a new bag preparation device structure that can increase the single stacking volume within a limited space while maintaining the reliability of the suction bag. Utility Model Content

[0005] One object of this invention is to solve at least the aforementioned defects and to provide at least the advantages described below.

[0006] This utility model provides a bag preparation device for a packaging machine, which solves the problem of frequent material replenishment due to limited stacking height by using a double-compartment alternating structure and a lifting compartment bottom design, thereby extending the continuous operation time.

[0007] This utility model provides a bag preparation device for a packaging machine, comprising:

[0008] frame;

[0009] Two spare bag compartments are arranged side by side. The upper bottom of each spare bag compartment is a non-perforated flat plate structure, and the upper bottom of each spare bag compartment is independently connected to a lifting mechanism.

[0010] The lifting mechanism includes a vertically arranged lead screw and nut assembly, a drive motor, and multiple vertical guide plates. The drive motor is fixedly connected to the bottom of the lower silo, the nut of the lead screw and nut assembly is fixedly installed on the bottom of the upper silo, and the bottom end of the lead screw is connected to the output shaft of the drive motor. The multiple vertical guide plates are evenly fixed to the edge of the lower silo and slide through the through holes or grooves of the edge of the upper silo.

[0011] The translation guide rail is horizontally fixed on the frame, and the bottom of the two bag compartments are slidably connected to the translation guide rail via sliders;

[0012] The lifting mechanism drives the bottom of the upper compartment to rise according to the change in the height of the stacked prefabricated bags, so that the topmost prefabricated bags are kept within a preset height.

[0013] This invention solves the problem of frequent material replenishment due to limited stacking height by using a dual-compartment alternating structure and a lifting compartment bottom design, thus extending continuous operation time. The dual spare bag compartments can be manually pushed, and the two compartments can be alternately switched via a sliding guide rail, so that when one spare bag compartment is directly below the bag suction mechanism, the other is located at the material replenishment station outside the frame.

[0014] Preferably, it also includes:

[0015] The translation drive assembly includes a rack and a servo motor. The rack is parallel to the translation guide rail and fixed to the frame. The servo motor is installed at the bottom of the bag storage compartment and outputs a gear that meshes with the rack. The translation drive assembly can alternately move the two bag storage compartments so that when one bag storage compartment is directly below the bag suction mechanism, the other bag storage compartment is located at the feeding station outside the frame.

[0016] This invention uses a translation drive component to electrically drive the alternating movement of the two spare bag bins, so that when one spare bag bin is located directly below the bag suction mechanism, the other spare bag bin is located at the material filling station outside the frame.

[0017] Preferably, the lifting mechanism further includes four guide columns, which are vertically fixed to the bottom of the lower compartment and pass through the four corners of the bottom of the upper compartment.

[0018] Linear bearings are installed at the four corners of the bottom of the upper silo, and the linear bearings are sleeved on the outer surface of the guide column;

[0019] The bottom end of the lead screw in the lead screw and nut assembly is connected to the output shaft of the drive motor via a coupling.

[0020] This claim ensures that there is no tilting during the lifting and lowering process of the silo bottom through the cooperation of the guide column and the linear bearing, thus preventing the prefabricated bag stack from collapsing.

[0021] Preferably, the translation drive assembly has two racks, which are arranged parallel to each other on both sides of the translation guide rail;

[0022] The output shaft of the servo motor is equipped with two gears that match the two racks, and the two gears mesh with the two racks respectively.

[0023] This claim uses a double rack and pinion drive to ensure synchronous and stable translation of the bag preparation compartment, so as to facilitate positioning to the bag suction station.

[0024] Preferably, the outermost vertical guide plates of the two side-by-side bag preparation compartments are higher than the crossbeam of the bag sorting mechanism, while the vertical guide plates on the other sides are lower than the crossbeam of the bag sorting mechanism, so that the vertical guide plates on the other sides can pass through the middle of the bag sorting mechanism of the packaging machine. Limit switches are provided at the upper ends of the outermost vertical guide plates to abut against the outer side of the bag sorting mechanism. The limit switches are connected to the servo motor controller.

[0025] Preferably, it also includes a lifting travel limiter, which includes a first photoelectric switch and a first reflector;

[0026] The first reflector is located on the side of a vertical guide plate on one side, and the first photoelectric switch is fixed on the opposite side of the other vertical guide plate and aligned with the first reflector. The first photoelectric switch is located in the middle of the working range of the suction bag mechanism.

[0027] The first photoelectric switch signal is connected to the drive motor controller.

[0028] Preferably, it also includes an empty cargo compartment detector, which includes a second photoelectric switch and a second reflector;

[0029] The second reflector is located on the bottom surface of the upper compartment, and the second photoelectric switch is fixed on the frame of the suction bag station and aligned with the second reflector located at the suction bag station.

[0030] The second photoelectric switch signal is connected to the drive motor controller, the servo motor controller, and the alarm, respectively.

[0031] Implementation process: After the last pre-made bag in the stack is sucked away, the second reflector is exposed. When the second photoelectric switch receives the signal from the second reflector, it triggers the drive motor controller to control the drive motor to drive the bottom of the upper compartment to descend to the initial position (reset). At the same time, it triggers the alarm to sound (it can be a light alarm and / or a sound alarm). It also triggers the servo motor controller to control the servo motor to drive another bag storage compartment (the bag storage compartment with pre-made bags) located directly below the bag suction mechanism. The bag storage compartment that has just used up the pre-made bags is located at the feeding station outside the frame, waiting to be refilled, which can effectively improve work efficiency.

[0032] Preferably, when the second photoelectric switch receives a signal from the second reflector, the following steps are executed sequentially:

[0033] The drive motor controller controls the drive motor to drive the upper hopper bottom to descend to the initial position;

[0034] The audible and visual alarm will sound continuously and / or the lights will flash for 5-10 seconds.

[0035] The servo motor controller controls the servo motor to drive another spare bag compartment to move below the suction bag mechanism;

[0036] Or execute synchronously.

[0037] This utility model has at least the following beneficial effects:

[0038] First, this invention utilizes an independent lifting mechanism that allows operators to manually or automatically raise the bottom of the bin according to changes in stacking height, ensuring that the top layer of pre-made bags is always within the effective working range of the suction mechanism. This significantly increases the number of pre-made bags that can be stacked at once, extends continuous operation time, and reduces downtime. The dual-bin design, combined with a sliding guide rail, allows material to be added to the other bin while one bin is in operation. By manually or automatically switching the positions of the two bins, rapid switching between the working bin and the adding bin is achieved.

[0039] Secondly, by combining the lifting stroke limiter and the lifting mechanism, this utility model can automatically drive the upper chamber bottom to rise and fall according to the real-time changes in the height of the stacked prefabricated bags, thereby ensuring that the bag suction mechanism can always reliably pick up the uppermost prefabricated bag.

[0040] Third, by combining an empty compartment detector, a drive motor controller, a servo motor controller, and an alarm, this utility model achieves automatic empty compartment reset, alarm prompts, and automatic full compartment switching, thereby ensuring the continuous and uninterrupted operation of the packaging machine and further improving work efficiency.

[0041] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0042] Figure 1 This is a three-dimensional structural diagram of the bag preparation device of the packaging machine described in this utility model;

[0043] Figure 2 This is a side view of the bag preparation device of the packaging machine described in this utility model;

[0044] The components include: frame 1; lower compartment bottom 2; upper compartment bottom 3; vertical guide plates on other sides 4; lead screw 5; nut 6; drive motor 7; slider 8; translation guide rail 9; outermost two vertical guide plates 10; multiple vertical guide plates 11; limit switch or travel switch 12; first photoelectric switch 13; first reflector 14; second photoelectric switch 15; second reflector 16; suction cup 17; crossbeam 18; and stacked pre-made bags 19. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the embodiments, so that those skilled in the art can implement it based on the description.

[0046] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are conventional methods, and the reagents and materials described are commercially available. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "setting" should be interpreted broadly. For example, they can refer to fixed connection or setting, detachable connection or setting, or integral connection or setting. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. The terms "lateral," "longitudinal," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0047] Figures 1-2 An implementation of a bag-preparing device for a packaging machine is shown, which includes:

[0048] Rack 1;

[0049] Two spare bag compartments are arranged side by side. The upper bottom 3 of each spare bag compartment is a non-perforated flat plate structure. The upper bottom 3 of each spare bag compartment is independently connected to a lifting mechanism.

[0050] The lifting mechanism includes a vertically arranged lead screw 5 and nut 6 assembly, a drive motor 7, and multiple vertical guide plates 11. The drive motor 7 is fixedly connected to the lower silo bottom 2, and the nut 6 of the lead screw 5 and nut 6 assembly is fixedly installed on the upper silo bottom 3. The bottom end of the lead screw 5 is connected to the output shaft of the drive motor 7. The multiple vertical guide plates 11 are evenly fixed to the edge of the lower silo bottom 2 and slide through the through holes or grooves on the edge of the upper silo bottom 3.

[0051] The translation guide rail 9 is horizontally fixed on the frame 1, and the bottom of the two bag compartments are slidably connected to the translation guide rail 9 via the slider 8;

[0052] The lifting mechanism drives the upper chamber bottom 3 to rise according to the height change of the stacked prefabricated bags 19, so that the uppermost prefabricated bags are maintained within the preset height.

[0053] The bag preparation mechanism shown in the previous application with publication number CN119873048A has a hollow bottom, which is conducive to the movement of the frame and the pushing of bags, but cannot support the lifting mechanism. If the single stacking capacity is increased, the bin body needs to be raised, but this will exceed the working range of the suction cup 17. Therefore, the number of prefabricated bags that can be stacked at one time is not large.

[0054] This invention solves the problem of frequent material replenishment due to limited stacking height by using a dual-compartment alternating structure and a lifting compartment bottom design, thus extending continuous operation time.

[0055] One embodiment of the bag preparation device of the packaging machine described in this utility model is shown below. Figures 1-2 As shown, it includes:

[0056] Frame 1: The main supporting structure of the device;

[0057] Two spare bag compartments arranged side by side: Two spare bag compartments are mounted side by side on frame 1. Each spare bag compartment contains:

[0058] Upper compartment bottom 3: It is a non-perforated flat structure, which is a solid, flat plate (such as steel plate or engineering plastic plate) that can provide a stable bearing surface for directly supporting stacked prefabricated bags.

[0059] Lower warehouse bottom 2: Located below the upper warehouse bottom 3, it forms the basic framework of the warehouse.

[0060] Independent lifting mechanism (one set per spare bag compartment): Each spare bag compartment's upper compartment bottom 3 is independently connected to a lifting mechanism, used to drive the upper compartment bottom 3 to move vertically relative to its lower compartment bottom 2. This lifting mechanism specifically includes:

[0061] Lead screw 5 and nut 6 assembly: vertically installed. The nut 6 is fixedly installed on one side or at a suitable location on the bottom of the upper compartment 3. The lead screw 5 extends vertically.

[0062] Drive motor 7: Fixedly mounted on the lower compartment bottom 2. The bottom end of the lead screw 5 is connected to the output shaft of the drive motor 7 via a coupling or other suitable connection method. The rotational motion of the drive motor 7 (e.g., a stepper motor or a servo motor) is converted into the linear lifting motion of the upper compartment bottom 3 through the lead screw 5 and nut 6 assembly.

[0063] Multiple vertical guide plates 11: Multiple vertical guide plates (e.g., eight as shown in the figure, evenly distributed along the four edges of the lower storage bottom 2, three evenly distributed along the long side and one along each of the short sides) are fixedly installed on the edges of the lower storage bottom 2. At the corresponding edges of the upper storage bottom 3, through holes or grooves matching the shape and position of these vertical guide plates are provided. The vertical guide plates slide through these through holes or grooves, providing precise vertical guidance for the lifting and lowering movement of the upper storage bottom 3, preventing horizontal deviation or rotation during lifting and lowering. The multiple vertical guide plates 11 also serve to limit the stacking of prefabricated bags 19.

[0064] Translation guide 9: One or more horizontal translation guides 9 are fixedly installed on the frame 1, and their extension direction is parallel to the side-by-side direction of the two bag compartments.

[0065] Slider 8: The bottoms of both spare bag compartments (usually the bottom of the lower compartment 2) are slidably connected to the translation guide rail 9 via slider 8. This allows the two spare bag compartments to slide horizontally on the frame 1 as a single unit or relatively independently (depending on the specific installation method) along the translation guide rail 9.

[0066] When this utility model is in operation, the operator manually pushes the two bag preparation bins along the translation guide rail 9 via the slider 8, so that one bag preparation bin (called bin A) slides to the material filling station outside the frame 1, and the other bag preparation bin (called bin B) slides to the bag suction station inside the frame 1 (that is, directly below the bag suction mechanism).

[0067] At the material filling station, the operator stacks a stack of pre-made bags on the bottom of the upper layer of the A compartment.

[0068] At the bag suction station, a stack of pre-made bags is already on the upper compartment bottom 3 of compartment B. For each compartment, the operator starts the drive motor 7, controlling the upper compartment bottom 3 to rise until the top layer of the stacked pre-made bags reaches the effective working height range of the suction cup 17 of the bag suction mechanism. Then, the drive motor 7 is stopped. At this point, compartment B is in a ready-to-work state.

[0069] The packaging machine starts working, and the suction bag mechanism continuously picks up pre-made bags from the top layer of compartment B, which is located directly below it. As the pre-made bags stacked in compartment B are continuously removed, the overall height of the machine gradually decreases.

[0070] When the operator observes that the top layer of pre-made bags 19 stacked in compartment B has dropped to near the lower limit of the effective working range of the suction cup 17 of the bag suction mechanism (e.g., by visually observing a preset height scale or reference object), the operator manually starts the drive motor 7 of compartment B. The drive motor 7 rotates the lead screw 5, which, through the nut 6, lifts the top layer of compartment B (including the remaining pre-made bags) upwards. When the operator observes that the top layer of pre-made bags has risen to near the upper limit of the effective working range of the suction cup 17, the operator manually stops the drive motor 7 of compartment B. In this way, the height of the top layer of pre-made bags is maintained back within the preset effective working range, ensuring that the bag suction mechanism can continuously and reliably suction bags. This process is repeated as needed during material feeding from compartment B.

[0071] When the pre-made bags in compartment B are almost used up (the operator observes a very low stacking height) or have been used up, the operator manually pushes the two spare bag compartments (by acting on the compartment body or a special handle) so that they slide together along the translation guide 9. Compartment A, which was originally located at the filling station (now filled with pre-made bags), moves to the bag suction station (directly below the bag suction mechanism); compartment B, which was originally located at the bag suction station (now empty or nearly empty), moves to the filling station outside frame 1. Compartment A enters the working state.

[0072] At the material filling station, the operator adds a new pre-made bag to the empty B bin and manually adjusts the height of the upper bin bottom 3 to a suitable position (usually lowered to a low position for easy material filling, and then raised to near the working height to stand by after material filling), in preparation for the next switchover.

[0073] When the pre-made bags in Warehouse A descend in height during the feeding process, the operator observes and manually controls the lifting and lowering.

[0074] When the pre-made bags in compartment A are about to run out, the operator manually pushes the two spare bag compartments to switch positions, allowing compartment B to enter the working position and compartment A to exit to the filling position for replenishment.

[0075] This process is repeated continuously, with manual pushing enabling the two bag preparation compartments to alternate between the filling station and the working station. The independent lifting mechanism of each compartment is manually controlled to maintain the stacking height of the pre-made bags in the working compartment within an effective range, thereby extending the continuous operation time and the reliability of the suction, and reducing the total number of downtimes caused by filling.

[0076] Another embodiment of this utility model further includes:

[0077] The translation drive assembly includes a rack and a servo motor. The rack is parallel to the translation guide rail 9 and fixed to the frame 1. The servo motor is installed at the bottom of the bag storage compartment and outputs a gear that meshes with the rack. The translation drive assembly can alternately move the two bag storage compartments so that when one bag storage compartment is located directly below the bag suction mechanism, the other bag storage compartment is located at the feeding station outside the frame 1.

[0078] This utility model achieves the alternating movement of the two spare bag bins by electric drive component, so that when one spare bag bin is located directly below the bag suction mechanism, the other spare bag bin is located at the material filling station outside the frame 1.

[0079] In another embodiment of this utility model, the lifting mechanism further includes four guide columns, which are not shown in the figure. The four guide columns are vertically fixed to the lower compartment bottom 2 and pass through the four corners of the upper compartment bottom 3.

[0080] Linear bearings are installed at the four corners of the upper silo bottom 3, and the linear bearings are sleeved on the outer surface of the guide column;

[0081] The bottom end of the lead screw 5 of the lead screw 5 and nut 6 assembly is connected to the output shaft of the drive motor 7 via a coupling.

[0082] This invention ensures that there is no tilting during the lifting and lowering process of the silo bottom through the cooperation of guide columns and linear bearings, thus preventing the prefabricated bag stacks from collapsing.

[0083] In another embodiment of this utility model, the rack of the translation drive assembly is provided with two racks, which are arranged in parallel on both sides of the translation guide rail 9;

[0084] The output shaft of the servo motor is equipped with two gears that match the two racks, and the two gears mesh with the two racks respectively.

[0085] This invention uses a double rack and pinion drive to ensure synchronous and stable translation of the bag preparation compartment, so as to facilitate positioning to the bag suction station.

[0086] In another embodiment of this utility model, the outermost two vertical guide plates 10 of the two side-by-side bag storage compartments are higher than the crossbeam 18 of the bag sorting mechanism, while the other vertical guide plates 4 are lower than the crossbeam 18 of the bag sorting mechanism, so that the other vertical guide plates 4 can pass through the middle of the bag sorting mechanism of the packaging machine. Limit switches 12 are provided at the upper end of the outermost two vertical guide plates to abut against the outer side of the bag sorting mechanism. The limit switches 12 are connected to the servo motor controller.

[0087] The implementation process of this utility model is as follows: When the servo motor controller controls the servo motor to drive one spare bag compartment to move directly below the bag suction mechanism, the limit switch 12 at the upper end of the outermost vertical guide of the spare bag compartment abuts against the outer side of the bag sorting mechanism. The servo motor controller receives the signal from the limit switch 12 and causes the servo motor to stop. When it is necessary to drive another spare bag compartment to move directly below the bag suction mechanism, the servo motor controller controls the servo motor to reverse and drive the other spare bag compartment to move directly below the bag suction mechanism. When the limit switch 12 at the upper end of the outermost vertical guide of the other spare bag compartment abuts against the outer side of the bag sorting mechanism, the servo motor controller receives the signal from the limit switch 12 and causes the servo motor to stop. This process is repeated to achieve the alternating movement of the two spare bag compartments to the position directly below the bag suction mechanism.

[0088] Another embodiment of the present invention further includes a lifting stroke limiter, which includes a first photoelectric switch 13 and a first reflector 14;

[0089] The first reflector 14 is disposed on the side of one vertical guide plate, and the first photoelectric switch 13 is fixed to the opposite side of the other vertical guide plate and aligned with the first reflector 14. The first photoelectric switch 13 is located in the middle of the working range of the suction bag mechanism.

[0090] The first photoelectric switch 13 is connected to the drive motor controller.

[0091] This utility model uses photoelectric limiting to enable the lifting mechanism to drive the upper chamber bottom 3 to rise according to the change in the height of the stacked pre-made bags, so that the uppermost pre-made bag is kept within the preset height (that is, within the effective working range of the suction cup 17), ensuring that the uppermost layer of the stacked pre-made bags is within the effective working range of the suction cup 17.

[0092] Implementation process: As the stacked prefabricated bags are continuously sucked away, the height decreases, exposing the first reflector 14. When the first photoelectric switch 13 receives the signal from the first reflector 14, it triggers the drive motor controller to control the drive motor 7 to drive the upper chamber bottom 3 to rise. When the stacked prefabricated bags rise to the point of blocking the first reflector 14, and the first photoelectric switch 13 does not receive the signal from the first reflector 14, it triggers the drive motor controller to control the drive motor 7 to pause. This process is repeated to realize that the lifting mechanism drives the upper chamber bottom 3 to rise according to the change in the height of the stacked prefabricated bags, so that the stacking height is within the effective working range of the suction cup 17.

[0093] Specifically, to enable the lifting mechanism to drive the upper compartment bottom 3 to rise according to the change in the stacked pre-made bags height, thus maintaining the uppermost pre-made bags within a preset height range (i.e., the effective working range of the suction cup 17 of the bag suction mechanism), this embodiment includes a lifting stroke limiter. The lifting stroke limiter includes a first photoelectric switch 13 and a first reflector 14. The first reflector 14 is fixedly installed on the inner side (facing the center of the compartment) of a vertical guide plate located on the rear side of the bag preparation compartment (relative to the translation direction). The first photoelectric switch 13 is fixedly installed on the inner side of a vertical guide plate located on the opposite side of the bag preparation compartment, and its transmitting / receiving end is strictly aligned with the first reflector 14. Crucially, the installation height of the first photoelectric switch 13 and the first reflector 14 is set near the middle of the effective working range of the suction cup 17 of the bag suction mechanism, for example, near the midpoint between the lowest and highest effective suction height of the suction cup 17 (the deviation can be within ±10%). In this embodiment, the installation height is preferably set to approximately 150mm from the upper surface of the lower compartment bottom 2 (assuming the suction cup 17 has an effective working minimum height of 100mm from the lower compartment bottom and a maximum height of 200mm from the lower compartment bottom). The signal output terminal of the first photoelectric switch 13 is connected to the controller of the drive motor 7 via a cable.

[0094] Its working process is as follows:

[0095] In the initial state, the stacked prefabricated bags are high enough to block the front of the first reflector 14. The first photoelectric switch 13 cannot receive the signal reflected back by the first reflector 14 from the light it emits (or the received signal strength is lower than the threshold). At this time, the drive motor 7 does not operate.

[0096] As the suction bag mechanism continuously removes the top layer of pre-made bags, the stacking height gradually decreases. When the stacking height decreases to the point where the first reflector 14 is exposed (i.e., the upper surface of the top layer of pre-made bags is lower than the installation height of the first photoelectric switch 13 / reflector), the first photoelectric switch 13 can receive the light signal reflected back from the first reflector 14 (or the signal strength exceeds the threshold), and then generates a trigger signal sent to the drive motor controller. After receiving the trigger signal, the drive motor controller controls the drive motor 7 to start and rotate in the forward direction (assuming it is defined as the upward direction), driving the upper chamber bottom 3 and the entire pre-made bag stack to rise through the lead screw 5 and nut 6 assembly. The rise of the upper chamber bottom 3 drives the pre-made bag stack to rise. When the top surface of the pre-made bag stack rises to the point where it once again blocks the first reflector 14, the first photoelectric switch 13 can no longer receive the reflected light signal (or the signal is below the threshold), and then generates a stop signal sent to the drive motor controller. After receiving the stop signal, the drive motor controller controls the drive motor 7 to stop rotating. At this time, the top layer of pre-made bags is maintained at a preset height (usually just around the height of the photoelectric switch, within the effective working range of the suction cup 17). Through the above closed-loop control process, the lifting mechanism can automatically drive the upper chamber bottom 3 to rise and fall according to the real-time changes in the height of the stacked pre-made bags, thereby ensuring that the suction bag mechanism can always reliably pick up the top layer of pre-made bags.

[0097] Another embodiment of the present invention further includes an empty compartment detector, which includes a second photoelectric switch 15 and a second reflector 16;

[0098] The second reflector 16 is located on the bottom surface of the upper warehouse bottom 3, and the second photoelectric switch 15 is fixed on the frame 1 of the suction bag station and aligned with the second reflector 16 located at the suction bag station.

[0099] The second photoelectric switch 15 signal is connected to the drive motor controller, the servo motor controller and the alarm respectively.

[0100] Implementation process: When the last pre-made bag in the stack is sucked away, the second reflector 16 is exposed. When the second photoelectric switch 15 receives the signal from the second reflector 16, it triggers the drive motor controller to control the drive motor 7 to drive the upper chamber bottom 3 to descend to the initial position (reset). At the same time, it triggers the alarm to sound an alarm (either a light alarm and / or a sound alarm). It also triggers the servo motor controller to control the servo motor to drive another bag storage chamber (the bag storage chamber with pre-made bags) located directly below the bag suction mechanism. The bag storage chamber that has just used up the pre-made bags is located at the feeding station outside the frame 1, waiting for feeding, which can effectively improve work efficiency.

[0101] Specifically, when the second photoelectric switch 15 continuously receives the reflected signal from the second reflector 16 (indicating that there are no bags obstructing the compartment) for a preset time (e.g., 1 second, to prevent false alarms), the system determines that the spare bag compartment is empty. At this time, the system performs the following operations:

[0102] Reset Empty Compartment: The drive motor controller reverses the drive motor 7, causing the upper compartment bottom 3 to descend. The upper compartment bottom 3 will continue to descend until it triggers the lower limit switch fixedly mounted on the frame of the lower compartment bottom 2. When the drive motor controller receives the trigger signal from the lower limit switch, it immediately stops the drive motor 7. At this point, the upper compartment bottom 3 reaches and stops at the defined 'initial position'.

[0103] At the same time, the drive motor controller (or central controller) triggers the audible and visual alarm to sound an alarm (e.g., a flashing red light and a buzzer) for 8 seconds, indicating to the operator that the spare bag compartment is empty and is preparing to switch to a spare bag compartment.

[0104] During or after the alarm period, the servo motor controller starts the servo motor, driving another bag-filling bin, currently located at the feeding station (outer side) and already filled with pre-made bags, to move inward along the translation guide rail 9 until the limit switch 12 at the top of its outermost vertical guide plate touches the limit block on the outer side of the bag-sorting mechanism, at which point the servo motor stops. At this point, the full-bag bin is accurately positioned in the working position directly below the bag-suction mechanism, ready for immediate feeding.

[0105] The bag storage bin, which has just been emptied and reset, is now located at the feeding station outside frame 1. Once the operator sees / hears the alarm, they can add a new stack of pre-made bags to the bin. After adding the bags, the bin returns to a 'standby' state, awaiting the next switchover. This process achieves automatic empty bin reset, alarm notification, and automatic full bin switching, ensuring continuous and uninterrupted operation of the packaging machine and further improving work efficiency.

[0106] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for this utility model. Other modifications can be easily made by those skilled in the art.

Claims

1. A bag preparation device for a packaging machine, characterized in that, include: frame; Two spare bag compartments are arranged side by side. The upper bottom of each spare bag compartment is a non-perforated flat plate structure, and the upper bottom of each spare bag compartment is independently connected to a lifting mechanism. The lifting mechanism includes a vertically arranged lead screw and nut assembly, a drive motor, and multiple vertical guide plates. The drive motor is fixedly connected to the bottom of the lower silo, the nut of the lead screw and nut assembly is fixedly installed on the bottom of the upper silo, and the bottom end of the lead screw is connected to the output shaft of the drive motor. The multiple vertical guide plates are evenly fixed to the edge of the lower silo and slide through the through holes or grooves of the edge of the upper silo. The translation guide rail is horizontally fixed on the frame, and the bottom of the two bag compartments are slidably connected to the translation guide rail via sliders; The lifting mechanism drives the bottom of the upper compartment to rise according to the change in the height of the stacked prefabricated bags, so that the topmost prefabricated bags are kept within a preset height.

2. The bag preparation device of the packaging machine according to claim 1, characterized in that, Also includes: The translation drive assembly includes a rack and a servo motor. The rack is parallel to the translation guide rail and fixed to the frame. The servo motor is installed at the bottom of the bag storage compartment and outputs a gear that meshes with the rack. The translation drive assembly can alternately move the two bag storage compartments so that when one bag storage compartment is directly below the bag suction mechanism, the other bag storage compartment is located at the feeding station outside the frame.

3. The bag preparation device of the packaging machine according to claim 1, characterized in that, The lifting mechanism also includes four guide columns, which are vertically fixed to the bottom of the lower compartment and pass through the four corners of the bottom of the upper compartment. Linear bearings are installed at the four corners of the bottom of the upper silo, and the linear bearings are sleeved on the outer surface of the guide column; The bottom end of the lead screw in the lead screw and nut assembly is connected to the output shaft of the drive motor via a coupling.

4. The bag preparation device of the packaging machine according to claim 2, characterized in that, The translation drive assembly has two racks, which are arranged in parallel on both sides of the translation guide rail; the output shaft of the servo motor is provided with two gears that match the two racks, and the two gears mesh with the two racks respectively.

5. The bag preparation device of the packaging machine according to claim 1, characterized in that, The outermost vertical guide plates of the two side-by-side bag storage compartments are higher than the crossbeam of the bag sorting mechanism, while the vertical guide plates on the other sides are lower than the crossbeam of the bag sorting mechanism, so that the vertical guide plates on the other sides can pass through the middle of the bag sorting mechanism of the packaging machine. Limit switches are installed at the upper end of the outermost vertical guide plates to abut against the outside of the bag sorting mechanism. The limit switches are connected to the servo motor controller.

6. The bag preparation device of the packaging machine according to any one of claims 1-5, characterized in that, It also includes a lifting travel limiter, which includes a first photoelectric switch and a first reflector; The first reflector is located on the side of a vertical guide plate on one side, and the first photoelectric switch is fixed on the opposite side of the other vertical guide plate and aligned with the first reflector. The first photoelectric switch is located in the middle of the working range of the suction bag mechanism. The first photoelectric switch signal is connected to the drive motor controller.

7. The bag preparation device of the packaging machine according to claim 2, characterized in that, It also includes an empty cargo detector, which includes a second photoelectric switch and a second reflector; The second reflector is located on the bottom surface of the upper compartment, and the second photoelectric switch is fixed on the frame of the suction bag station and aligned with the second reflector located at the suction bag station. The second photoelectric switch signal is connected to the drive motor controller, the servo motor controller, and the alarm, respectively.

8. The bag preparation device of the packaging machine according to claim 7, characterized in that, When the second photoelectric switch receives a signal from the second reflector, the following steps are executed sequentially: The drive motor controller controls the drive motor to drive the upper hopper bottom to descend to the initial position; The audible and visual alarm will sound continuously and / or the lights will flash for 5-10 seconds. The servo motor controller controls the servo motor to drive another spare bag compartment to move below the suction bag mechanism; Or execute synchronously.

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