Automatic lifting paper feeding device of die-cutting machine

Abstract

The invention relates to the technical field of paper feeding machines, in particular to an automatic lifting paper feeding device of a die-cutting machine, which comprises a paper feeding system with a feeder head and a lifting system for lifting paperboards, and the lifting system comprises a horizontal paperboard conveying line and vertical conveying groups symmetrically arranged on two sides of the paperboard conveying line. The paperboard conveying line is arranged under the feeder head, and the width of the paperboard conveying line is smaller than that of the paperboard supporting plate. The vertical conveying set on each side comprises a vertical closed-loop annular conveying line, the side, close to the paperboard conveying line, of the annular conveying line is a working side, and the side, away from the paperboard conveying line, of the annular conveying line is a reset side. The two supporting plates are fixedly installed on the annular conveying line and arranged in the length direction of the annular conveying line in a spaced mode, and the phase difference of the two supporting plates is 1 / 2 of the total length of the annular conveying line. The scheme is used for solving the problems that in the prior art, a traditional paper feeding device is low in paper supplementing efficiency, and a rotary type double-paper-feeding-base technology is high in space requirement.

Description

Technical Field

[0001] This invention relates to the field of paper feeding machine technology, and more specifically to an automatic lifting and feeding device for a die-cutting machine. Background Technology

[0002] As a key piece of equipment in the printing and packaging industry, the performance of the paper feeding mechanism of a die-cutting machine directly affects production efficiency and processing quality. Traditional paper feeding mechanisms typically use a screw to drive a lifting plate for vertical movement. A tray is placed on the lifting plate, and then stacked with cardboard to be processed. The feeder head picks up the top layer of cardboard through a suction nozzle and delivers it to the die-cutting machine's input line. However, this traditional structure has a significant efficiency bottleneck. When a stack of cardboard is used up, the lifting plate must be lowered to its lowest position, and new trays and cardboard must be manually placed before it is raised back to the working height. This process is not only time-consuming but also causes frequent machine downtime, severely impacting production efficiency. Especially in high-speed die-cutting operations, frequent downtime for refilling significantly reduces equipment utilization and increases production costs.

[0003] To address this issue, existing technologies have proposed rotary dual-station paper feeding solutions. For example, patent CN221643969U discloses an automatic non-stop paper feeding mechanism for a die-cutting machine. This solution uses a rotatable paper feeder equipped with two independent paper feed seats, achieving non-stop paper feeding through rotational switching. However, die-cutting machines are typically installed in compact production workshops, requiring a large operating space for the rotary mechanism. Nothing else can be placed within the maximum rotation radius, and it must be able to ensure that it is positioned precisely at the paper feeding location after rotation. However, in actual space, the paper feeding device is adjacent to the die-cutting machine's feeding conveyor structure. The remaining space below and around the feeding conveyor structure is insufficient to implement the dual paper feed seat structure described in this technology. Summary of the Invention

[0004] The present invention aims to provide an automatic lifting and feeding device for a die-cutting machine, so as to solve the problems of low paper replenishment efficiency of traditional paper feeding devices in the prior art, and the high space requirements of rotary double paper feeder technology.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: An automatic lifting and feeding device for a die-cutting machine includes a feeding system with a feeder head and a lifting system for lifting the paperboard. The lifting system includes a horizontal paperboard conveyor line and vertical conveyor groups symmetrically arranged on both sides of the paperboard conveyor line. The paperboard conveyor line is located directly below the feeder head, and the width of the paperboard conveyor line is smaller than the width of the paperboard support. Each vertical conveyor group includes: A vertical closed-loop circular conveyor line, with the side of the circular conveyor line closer to the cardboard conveyor line being the working side and the side farther away being the reset side; Two support plates are fixedly installed on the circular conveyor line. The two support plates are spaced apart along the length of the circular conveyor line and the phase difference is 1 / 2 of the total length of the circular conveyor line.

[0006] The principle and advantages of this scheme are as follows: This scheme adopts a vertically arranged circular conveyor line, with closed-loop circular conveyors symmetrically set on both sides of the cardboard conveyor line. Two sets of support plates are installed on the circular conveyor line, and the two sets of support plates are arranged at intervals along the length of the circular conveyor line, with the interval being half the total length of the circular conveyor line. The width of the cardboard support is greater than the width of the conveyor line, forming a cantilever structure on both sides. When one set of support plates rises to lift the cardboard support on the working side closer to the conveyor line, the other set of support plates descends synchronously on the reset side farther from the conveyor line. This arrangement ensures that when one set of support plates completes its paper feeding and reaches the top, the other set of support plates has just moved to the bottom receiving position, realizing the alternating work of the two sets of support plates.

[0007] This solution addresses two major issues in existing technologies through its vertical closed-loop conveyor line and alternating double support plates. First, compared to the traditional single-lifting-plate method requiring machine stoppage for paper replenishment, this solution significantly reduces the time spent on paper replenishment, thereby greatly improving production efficiency. Second, compared to the disadvantage of rotary double paper feeders requiring a large rotation space, this solution's paper feeding device occupies less space, making it more suitable for use in compact working environments. Preferably, as an improvement, the cardboard conveyor line is a roller conveyor line; it also includes a rod feeding mechanism, which includes a lifter and at least two reinforcing rods, each reinforcing rod corresponding to a different position on the support plate, and each reinforcing rod rising from the gap between two adjacent rollers under the drive of the lifter.

[0008] Beneficial effect: After the support plate supports the reinforcing rod, the reinforcing rod and the support plate together form a bracket structure to improve the load-bearing capacity.

[0009] Preferably, as an improvement, two synchronous auxiliary feeding lines are provided below the roller line. The auxiliary feeding lines are set horizontally, and multiple positioning stops are fixed at equal intervals on the auxiliary feeding lines. The reinforcing rod is used to be placed on the auxiliary feeding lines. The lifting device is located between the two auxiliary feeding lines. When the lifting device is activated, the required reinforcing rod is raised to the set height.

[0010] Beneficial effects: This solution completes the feeding requirements of all the reinforcing rods needed for the bracket with a single auxiliary feeding line. Furthermore, by setting the reinforcing rods to be placed close to the positioning stops, it ensures that the reinforcing rods are prepared at equal intervals on the auxiliary feeding line, ensuring that all reinforcing rods are fed to the required positions simultaneously.

[0011] Preferably, as an improvement, the bottom of the tray is provided with a receiving groove, the depth of which is equal to the height of the reinforcing rod, a magnet is provided inside the receiving groove, and the reinforcing rod is made of ferromagnetic material.

[0012] Beneficial effect: The magnetic receiving slot allows the reinforcing rod to be removed along with the tray after use, avoiding the tedious operation of removing the tray and reinforcing rod separately after the tray is empty.

[0013] Preferably, as an improvement, the support plate includes a fixed plate fixedly connected to the annular conveyor line and a floating plate slidably connected to the fixed plate. An elastic element is provided between the floating plate and the fixed plate. On the working side, the floating plate is located above the fixed plate and is used to directly contact the tray plate.

[0014] Beneficial effects: The layered support plates allow the fixed plate to bear the main weight, the floating plate to provide flexible contact, and the elastic elements to absorb the impact during operation.

[0015] Preferably, as an improvement, the same-side circular conveyor line is installed on a support base; a discharge plate is connected to the support base, and multiple discharge rollers with gradually varying heights are installed on the discharge plate along the conveying direction of the cardboard conveyor line. The discharge roller farthest from the circular conveyor line is at the lowest position, and a baffle is fixed at the end of the discharge plate near the lowest position of the discharge roller. It also includes an ejection mechanism for pushing the tray from the support plate onto the discharge roller.

[0016] Beneficial effects: The height-gradient discharge rollers, combined with the pushing mechanism, form an automatic unloading structure, enabling empty pallet trays to be quickly and automatically transferred in a short time. The inclined discharge rollers ensure that the pallet trays are quickly transferred onto the discharge rollers, and the baffles prevent the pallet trays from falling, achieving safe and efficient removal of empty pallet trays.

[0017] Preferably, as an improvement, the support seats on both sides can move closer or further apart under the drive of a linear drive source to accommodate the lifting and feeding of paperboards of different widths.

[0018] Preferably, as an improvement, each support base is connected to a base plate, and a guide assembly is installed on the base plate. The guide assembly includes a parallel guide section and an inclined guide section. Both the parallel guide section and the inclined guide section include multiple guide rollers. The guide rollers are used to contact the side of the cardboard. All guide rollers in the parallel guide section are equidistant from the center line of the cardboard conveyor. The closer the guide rollers in the inclined guide section are to the input end of the cardboard conveyor, the farther they are from the center line of the cardboard conveyor. The distance between the guide rollers in the inclined guide section and the center line of the cardboard conveyor is not less than the distance between the guide rollers in the parallel guide section and the center line of the cardboard conveyor. In this solution, the inclined guide sections on both sides of the cardboard conveyor form a flared opening, which facilitates the guidance of cardboard that is not centered on the cardboard conveyor, and achieves the centering correction of the cardboard, ensuring that the cardboard on the tray below the feeder head is basically centered from left to right. This solution reduces the requirements for workers to place trays on the cardboard conveyor and automatically adjusts the centering of the cardboard during the process of the cardboard conveyor transporting the trays.

[0019] Preferably, as an improvement, the bottom of the base plate is equipped with support rollers. The support rollers in this solution are designed so that when the support seat moves horizontally, the guide component moves synchronously with the support seat.

[0020] Preferably, as an improvement, the discharge plate is rotatably connected to the support base, and a support rod is movably arranged between the middle of the discharge plate and the side of the support base. After the support rod is removed, the discharge plate folds towards the support base under its own weight. The movably arranged support rod in this solution is installed between the discharge plate and the support base when the lifting and feeding device is working, and the support rod supports the discharge plate. During the transportation of the lifting and feeding device, removing the support rod can greatly reduce the floor space occupied by the single-sided vertical conveyor group, thereby facilitating transportation. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention (the circular chain conveyor line in the attached figure is a simplified diagram and the chain plate is not clearly shown).

[0022] Figure 2 for Figure 1 A three-dimensional structural diagram showing a work area with trays to be used and a spare tray on the tray conveyor line (the trays in the diagram are all stacked with cardboard).

[0023] Figure 3 for Figure 1 Top view.

[0024] Figure 4 for Figure 1 The main view.

[0025] Figure 5 for Figure 1 The right view.

[0026] Figure 6 This is a three-dimensional structural schematic diagram of the lifting system according to an embodiment of the present invention.

[0027] Figure 7 for Figure 6 The diagram shows only a three-dimensional structural schematic of the vertical conveyor group on one side and the cardboard conveyor line.

[0028] Figure 8 for Figure 7 A three-dimensional structural diagram of a vertical conveyor group on only one side.

[0029] Figure 9 for Figure 8 A schematic diagram of the structure of the central ring conveyor line (two support plates are shown in the figure).

[0030] Figure 10 for Figure 9 A right-side cross-sectional view.

[0031] Figure 11 for Figure 10 Enlarged schematic diagram of part I in the diagram.

[0032] Figure 12 This is a three-dimensional structural diagram illustrating the support plates on both sides, the reinforcing rod, and the support plate when the device is lifted, as shown in an embodiment of the present invention.

[0033] Figure 13 for Figure 12 Exploded view.

[0034] Figure 14 This is a three-dimensional structural diagram of the rod mechanism and the reinforcing rod, as shown in an embodiment of the present invention.

[0035] The reference numerals in the accompanying drawings include: feeder head 201, paper feeding system 200, lifting system 100, cardboard conveyor line 10, vertical conveyor group 20, support base 1, linear drive source 11, circular conveyor line 2, support plate 21, fixed plate 211, floating plate 212, elastic element 213, guide rod 214, connecting plate 2111, limit head 2141, discharge plate 3, discharge roller 31, baffle 32, support rod 33, bottom plate 4, guide assembly 41, guide roller 411, support roller 42, ejection mechanism 5, push plate 51, feeding rod mechanism 6, reinforcing rod 61, auxiliary feeding line 7, positioning stop 71, cardboard support 300, receiving groove 301, stacked cardboard 400. Detailed Implementation

[0036] The following detailed description illustrates the specific implementation method: The basic implementation examples are as follows: Figures 1 to 14 As shown.

[0037] An automatic lifting and feeding device for a die-cutting machine includes a paper feeding system 200 with a feeder head 201 and a lifting system 100 for lifting and lowering the paperboard. In this embodiment, the paper feeding system 200 with the feeder head 201 adopts a prior art paper feeding system 200, wherein the suction nozzle on the feeder head 201 can be lifted and lowered and translated horizontally under the drive of the paper feeding system 200. For example, the paper feeding system 200 can be a "dead-angle-free transmission device for a paper feeder" as disclosed in patent publication number CN214827483U. The lifting system 100 is used to lift the paperboard support 300 and drive the paperboard support 300 and the paperboard stacked on it to rise and fall together.

[0038] The improved design of the present invention lies in the lifting system 100. Specifically, the lifting system 100 includes a horizontal cardboard conveyor line 10 and vertical conveyor groups 20 symmetrically arranged on both sides of the cardboard conveyor line 10. The cardboard conveyor line 10 is located directly below the feeder head 201. The width of the cardboard conveyor line 10 is less than the width of the cardboard tray 300. The width of the cardboard is equal to or substantially equal to the width of the cardboard tray 300, so that the cardboard tray 300 forms a double-sided cantilever structure on the cardboard conveyor line 10.

[0039] The more detailed structure is as follows: 1. 20 vertical conveyor groups on each side Each vertical conveyor group 20 includes a support base 1, a vertical closed-loop conveyor line 2 mounted on the support base 1, a discharge plate 3 rotatably mounted on the upper outer side of the support base 1, and a base plate 4 detachably connected to the bottom outer side of the support base 1.

[0040] The side of the circular conveyor line 2 closest to the cardboard conveyor line 10 is the working side, and the side furthest away is the reset side. Two support plates 21 are fixedly installed on the circular conveyor line 2. The two support plates 21 are spaced apart along the length of the circular conveyor line 2, with a phase difference of 1 / 2 of the total length of the circular conveyor line 2. The support plates 21 are used to support the double-sided cantilever structure of the cardboard tray 300. The circular conveyor line 2 is a circular chain conveyor line, and the support plates 21 are fixedly installed on the chain plate of the circular chain conveyor line.

[0041] To improve production efficiency when switching to a new stack of cardboard, the conveyor speed of the circular conveyor line 2 is increased when it is idle. The faster the speed, the greater the impact on the tray 300. To reduce this impact, the support plate 21 is designed with a layered structure. The support plate 21 consists of a fixed plate 211 with a fixed connection and a floating plate 212 slidably connected to the fixed plate 211. An elastic element 213 is provided between the floating plate 212 and the fixed plate 211. On the working side, the floating plate 212 is located above the fixed plate 211 and is used to directly contact the tray 300. Specifically, the end of the floating plate 212 facing the fixed plate 211 is fixed... A guide rod 214 is fixed, and an elastic element 213 is a spring. The spring is sleeved on the guide rod 214. A through hole is opened on the fixed plate 211. A U-shaped connecting plate 2111 is fixed on the side of the fixed plate 211 away from the floating plate 212. The guide rod 214 passes through the through hole and the U-shaped connecting plate 2111 and is slidably connected to the U-shaped connecting plate 2111. When the ring conveyor line 2 sends the support plate 21 to the working side, there is a height difference between the floating plate 212 and the fixed plate 211 under the elastic force of the elastic element 213. This ensures that when the floating plate 212 supports the support plate 300, it gradually overcomes the elastic force of the elastic element 213 before finally completing the support.

[0042] In addition, to prevent the floating plate 212 on the reset side from falling off relative to the fixed plate 211, a limit head 2141 is fixed at the end of the guide rod 214 away from the floating plate 212.

[0043] The discharge plate 3 is located on the side of the cardboard conveyor line 10 in the width direction. Multiple discharge rollers 31 with gradually varying heights are installed on the discharge plate 3 along the conveying direction of the cardboard conveyor line 10. The discharge roller 31 farthest from the circular conveyor line 2 is at the lowest position. A baffle 32 is fixed to the end of the discharge plate 3 near the lowest position of the discharge roller 31. In addition, in order to reduce the floor space occupied during operation and transportation, the discharge plate 3 is rotatably connected to the support base 1, and a support rod 33 is movably installed between the middle of the discharge plate 3 and the side of the support base 1. After the support rod 33 is removed, the discharge plate 3 folds towards the support base 1 under its own weight.

[0044] To facilitate the quick and automatic delivery of empty tray paper 300 after the paperboard is fed by feeder head 201, a push mechanism 5 is provided on the outside of the output end of the paperboard conveyor line 10. The push mechanism 5 includes a pusher and a push plate 51 of the pusher output section. The push mechanism 5 cooperates with the discharge roller 31 on the discharge plate 3 to quickly push the empty tray paper 300 from the support plate 21 onto the discharge roller 31 of the discharge plate 3 under the push of the push plate 51.

[0045] To accommodate the lifting and feeding of paperboards of different widths, the support seats 1 on both sides are installed under the linear drive source 11. The linear drive source 11 drives the support seats 1 on both sides to move closer or further away from each other. Specifically, the linear drive source 11 can be a linear drive source 11 with a bidirectional threaded screw. The support seats 1 on both sides are respectively threaded to different thread sections of the bidirectional threaded screw. After the linear drive source 11 is started, the support seats 1 move along the width direction of the paperboard conveyor line 10.

[0046] Guide components 41 are installed on the base plate 4 installed on the outer bottom of each support 1. The guide components 41 include a parallel guide section and an inclined guide section. Both the parallel guide section and the inclined guide section include multiple guide rollers 411. The guide rollers 411 are used to contact the side of the cardboard. All guide rollers 411 of the parallel guide section are equidistant from the center line of the cardboard conveyor line 10. The closer the guide rollers 411 of the inclined guide section are to the input end of the cardboard conveyor line 10, the farther they are from the center line of the cardboard conveyor line 10. The distance between the guide rollers 411 of the inclined guide section and the center line of the cardboard conveyor line 10 is not less than the distance between the guide rollers 411 of the parallel guide section and the center line of the cardboard conveyor line 10. This makes the inclined guide sections on both sides of the cardboard conveyor line 10 form a flared opening, which facilitates the automatic guidance of cardboard that is not centered on the cardboard conveyor line 10, realizes the centering correction of the cardboard, and ensures that the cardboard delivered to the cardboard tray 300 below the feeder head 201 is basically centered from left to right.

[0047] Each base plate 4 is equipped with a support roller 42 at its bottom, so that when the support base 1 moves horizontally, the guide component 41 moves synchronously with the support base 1, thus realizing the synchronous adjustment of the guide component 41.

[0048] II. Cardboard conveyor line 10 and feeder mechanism 6 The cardboard conveyor line 10 is a roller line; it also includes a rod feeding mechanism 6, which includes a lifter and at least two reinforcing rods 61. Each reinforcing rod 61 corresponds to a different position on the support plate 21. Each reinforcing rod 61 rises from the gap between two adjacent rollers under the drive of the lifter. In this embodiment, the rod feeding mechanism 6 has three reinforcing rods 61. The three reinforcing rods 61 can share one lifter, or they can each have their own independent lifter as shown in the attached figure.

[0049] As the support plate 21 gradually moves from the reset side to the working side via the lever mechanism 6, the lifter is activated, driving the reinforcing rod 61 upward to below the tray 300. As the support plate 21 on the working side continues to rise, the reinforcing rod 61 and the tray 300 are lifted together.

[0050] The bottom of the tray 300 has a receiving groove 301. The depth of the receiving groove 301 is equal to the height of the reinforcing rod 61. A magnet is installed in the receiving groove 301. The reinforcing rod 61 is made of ferromagnetic material. The receiving groove 301 is used to receive the reinforcing rod 61. The dimension of the receiving groove 301 along the conveying direction of the paperboard conveyor line 10 is larger than the dimension of the reinforcing rod 61 in the corresponding direction, so as to facilitate the reinforcing rod 61 to be integrated with the tray 300.

[0051] After the support plate 21 supports the reinforcing rod 61, the bottom surface of the reinforcing rod 61 directly contacts the support plate 21. Therefore, the reinforcing rod 61 and the support plate 21 together form a bracket structure to improve the load-bearing capacity of the support plate 300.

[0052] To prepare the reinforcing rod 61, two synchronous auxiliary feeding lines 7 are provided below the roller line. The auxiliary feeding lines 7 are set horizontally and are belt lines. Multiple positioning stops 71 are fixed at equal intervals on the auxiliary feeding lines 7. The reinforcing rod 61 is placed on the auxiliary feeding lines 7 and is set against the positioning stops 71. The lifting device is located between the two auxiliary feeding lines 7. When the lifting device is activated, the required reinforcing rod 61 is raised to the set height.

[0053] This embodiment discloses an automatic lifting and feeding method for a die-cutting machine, including the following steps: S0. Initial preparation stage: Adjust the support base 1 so that the spacing between the two circular conveyor lines 2 meets the requirements; ensure that the support rod 33 is installed in place and the discharge plate 3 is in the unfolded state relative to the support base 1.

[0054] S1. The cardboard conveyor line 10 starts and conveys the trays 300 with stacked cardboard into the working area. After the sensor installed at the end of the cardboard conveyor line 10 detects the trays 300, the cardboard conveyor line 10 stops.

[0055] During the process of the tray 300 being conveyed by the paperboard conveyor line 10, the tray 300 that is not centered is continuously guided by the guide component 41 to achieve automatic centering of the stacked paperboards on the tray 300.

[0056] S2. During the conveying process of the two-sided circular conveyor lines 2, the cantilever structure of the cardboard support 300 extending from both sides of the cardboard conveyor line 10 is supported by the support plate 21 on the working side.

[0057] During this process, before the support plate 21 lifts the tray 300, the control rod mechanism 6 is started, the lifter drives the reinforcing rod 61 to rise, and the reinforcing rod 61 is placed into the receiving groove 301 at the bottom of the tray 300. After the support plate 21 rises, the reinforcing rod 61 and the tray 300 are lifted at the same time.

[0058] S3, Paper feeding stage: The support plate 21 on the working side drives the paperboard 300 to rise continuously, while the paper suction nozzle of the feeder head 201 continuously feeds the paperboard to the input line of the die-cutting machine, and the support plate 21 on the reset side continuously descends back to its original position.

[0059] S4, Standby Stage: After the tray 300 is lifted by the working side support plate 21 to a space below the tray 300 where the next stack of paperboard can be placed, the paperboard conveyor line 10 starts and sends the tray 300 with the paperboard stacked on the paperboard conveyor line 10 to the working area for standby; after the sensor installed at the end of the paperboard conveyor line 10 senses the tray 300, the paperboard conveyor line 10 stops.

[0060] S5. After the feeder head 201 finishes feeding the paperboard on the working side upper support plate 300, the feeder head 201 stops working, and the ejection mechanism 5 pushes the empty support plate 300 onto the discharge plate 3.

[0061] S6. The circular conveyor line 2 continues to convey paper, and the support plate 21 on the working side is transferred to the reset side, while the support plate 21 on the reset side returns to the working side. The cycle of steps S2-S5 continues until the set paper feeding task is completed.

[0062] This embodiment, through its structural design of a vertically closed-loop annular conveyor line 2 and alternating double support plates 21, can significantly shorten the time spent on the paper replenishment process, thereby improving production efficiency. Secondly, compared to the disadvantage of a rotary double paper feeder requiring a large rotation space, the paper feeding device in this embodiment occupies less space, making it more suitable for use in compact working environments. Furthermore, when the paper tray 300 is fed onto the paperboard conveyor line 10, the requirements for worker placement of the paper tray 300 are reduced; even if the paper tray 300 is skewed, it can be corrected and centered under the automatic guidance of the guide components 41 on both sides.

[0063] Furthermore, this embodiment can control the movement of the support base 1 after the width of the tray plate 300 changes, so as to adjust the spacing between the two annular conveyor lines 2. Under the mechanical connection between the support base 1 and the base plate 4, the spacing between the two support bases 1 is adjusted at the same time as the spacing between the two guide components 41 is adjusted, without the need for manual intervention to adjust the spacing between the guide components 41 separately, which helps to improve the degree of automation.

[0064] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An automatic lifting and feeding device for a die-cutting machine, comprising a feeding system with a feeder head and a lifting system for lifting the paperboard, characterized in that: The lifting system includes a horizontal cardboard conveyor line and vertical conveyor groups symmetrically arranged on both sides of the cardboard conveyor line. The cardboard conveyor line is located directly below the feeder head, and its width is smaller than the width of the cardboard tray. Each vertical conveyor group includes: A vertical closed-loop circular conveyor line, with the side of the circular conveyor line closer to the cardboard conveyor line being the working side and the side farther away being the reset side; Two support plates are fixedly installed on the circular conveyor line. The two support plates are spaced apart along the length of the circular conveyor line and the phase difference is 1 / 2 of the total length of the circular conveyor line.

2. The automatic lifting and feeding device for a die-cutting machine according to claim 1, characterized in that: The cardboard conveyor line is a roller conveyor line; It also includes a rod feeding mechanism, which includes a lifter and at least two reinforcing rods. Each reinforcing rod corresponds to a different position on the support plate, and each reinforcing rod rises from the gap between two adjacent rollers under the drive of the lifter.

3. The automatic lifting and feeding device for a die-cutting machine according to claim 2, characterized in that: Below the roller conveyor, there are two synchronous auxiliary feeding lines. The auxiliary feeding lines are set horizontally and have multiple positioning stops fixed at equal intervals. The reinforcing rod is used to place on the auxiliary feeding line. The lifting device is located between the two auxiliary feeding lines. When the lifting device is activated, it raises the required reinforcing rod to the set height.

4. The automatic lifting and feeding device for a die-cutting machine according to claim 2, characterized in that: The bottom of the tray is provided with a receiving groove, the depth of which is equal to the height of the reinforcing rod. A magnet is provided inside the receiving groove, and the reinforcing rod is made of ferromagnetic material.

5. The automatic lifting and feeding device for a die-cutting machine according to claim 1, characterized in that: The support plate includes a fixed plate fixedly connected to the annular conveyor line and a floating plate slidably connected to the fixed plate. An elastic element is provided between the floating plate and the fixed plate. On the working side, the floating plate is located above the fixed plate and is used to directly contact the tray plate.

6. An automatic lifting and feeding device for a die-cutting machine according to any one of claims 1-5, characterized in that: The circular conveyor on the same side is installed on the support base; the support base is connected to the discharge plate, and multiple discharge rollers with gradually varying heights are installed on the discharge plate along the conveying direction of the cardboard conveyor. The discharge roller farthest from the circular conveyor is at the lowest position, and a baffle is fixed at the end of the discharge plate near the lowest position of the discharge roller. It also includes an ejection mechanism for pushing the tray from the support plate onto the discharge roller.

7. The automatic lifting and feeding device for a die-cutting machine according to claim 6, characterized in that: The support bases on both sides can move closer to or further apart from each other under the drive of a linear drive source.

8. The automatic lifting and feeding device for a die-cutting machine according to claim 7, characterized in that: Each support base is connected to a base plate, and a guide assembly is installed on the base plate. The guide assembly includes a parallel guide section and an inclined guide section. Both the parallel guide section and the inclined guide section include multiple guide rollers. The guide rollers are used to contact the side of the cardboard. All guide rollers in the parallel guide section are equidistant from the center line of the cardboard conveyor. The closer the guide rollers in the inclined guide section are to the input end of the cardboard conveyor, the farther they are from the center line of the cardboard conveyor. The distance between the guide rollers in the inclined guide section and the center line of the cardboard conveyor is not less than the distance between the guide rollers in the parallel guide section and the center line of the cardboard conveyor.

9. An automatic lifting and feeding device for a die-cutting machine according to claim 8, characterized in that: The bottom of the base plate is equipped with support rollers.

10. An automatic lifting and feeding device for a die-cutting machine according to claim 6, characterized in that: The discharge plate is rotatably connected to the support base. A support rod is movably installed between the middle of the discharge plate and the side of the support base. After the support rod is removed, the discharge plate folds towards the support base under its own weight.

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