A rotary knife die cutter

Abstract

The utility model discloses a kind of round knife die-cutting machines, including mainframe, unwinding unit, deviation rectifying system, tension control system, die-cutting unit, material discharging and collecting unit and winding unit, the material discharging and collecting unit includes material collecting hopper and stripping device, the material collecting hopper is set in the discharging end of the die-cutting unit, and is located below with material, the top of the material collecting hopper is provided with leakage groove;Stripping device is set above with material, in the process that with material passes through the leakage groove, the stripping device can impact the material on with periodic mode to be discharged to be pressed into leakage groove with the material discharged into leakage groove.This round knife die-cutting machine can significantly improve waste stripping efficiency, thereby avoid the situation that material discharging is not complete occurs.

Description

Technical Field

[0001] This utility model relates to the field of die-cutting machine technology, specifically to a circular die-cutting machine. Background Technology

[0002] A rotary die-cutting machine is an automated device that uses a rotating cylindrical die to continuously, quickly, and precisely die-cut rolls of material. It is widely used in industries such as labeling, packaging, adhesive tape, electronic tapes, and medical consumables. As a core processing device in these industries, its performance directly impacts production efficiency and product quality.

[0003] Traditional rotary die-cutting machines mainly consist of a main frame, unwinding unit, web guiding system, tension control system, die-cutting unit (including cutter roller, bottom roller, pressure regulating device, and registration system), material discharge and collection unit, winding unit, and control system. During die-cutting, the strip passes through the interlocking point between the rotating cutter roller and bottom roller, completing the cutting action under pressure. However, the material discharge and collection system in existing technology has significant drawbacks, severely restricting further improvements in equipment performance.

[0004] Currently, most mainstream material discharge and collection units rely on gravity to allow the cut material to fall naturally through the collection holes. This passive discharge method has revealed several problems in practical applications: First, when the cutting and separation effect is good, the material falls smoothly; however, when incomplete cutting occurs, the material adheres and continues to be conveyed with the strip, resulting in incomplete discharge. Second, for lightweight or sticky materials (such as some adhesive products), gravity is often insufficient to completely detach the material from the strip. Furthermore, during high-speed production, the material tends to accumulate at the edges of the collection holes due to inertia, affecting discharge efficiency and potentially causing equipment blockage.

[0005] These problems necessitate frequent shutdowns for cleaning during production, reducing efficiency and increasing labor costs. More seriously, residual waste material can be drawn into subsequent processing stages, causing surface damage or uneven winding of the strip. While some improvement solutions attempt to improve material discharge by adding vibration or airflow assistance, these solutions are either structurally complex and difficult to maintain, or have high energy consumption, making stable operation difficult in high-speed continuous production. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a circular die-cutting machine that can significantly improve the waste stripping efficiency, thereby avoiding the occurrence of incomplete material discharge.

[0007] To achieve the above objectives, this utility model is implemented through the following technical solution: a circular die-cutting machine, comprising:

[0008] The system includes a main frame, an unwinding unit, a web guiding system, a tension control system, a die-cutting unit, a material discharge and collection unit, and a rewinding unit. The material discharge and collection unit comprises:

[0009] A material collection hopper is located at the discharge end of the die-cutting unit and below the conveyor belt; a material discharge groove is provided on the top of the material collection hopper.

[0010] A stripping device is disposed above the conveyor belt. As the conveyor belt passes through the discharge trough, the stripping device can periodically impact the material falling off the conveyor belt to press the material falling off into the discharge trough.

[0011] Furthermore, the stripping device includes a nozzle and an intermittent gas generator. The nozzle is located above and aligned with the material discharge trough. The intermittent gas generator is connected to the nozzle and is used to periodically supply gas to the nozzle to impact the falling material into the collection hopper.

[0012] Furthermore, the intermittent gas generator includes an inflatable ball, a main gas pipe, an inlet one-way valve, an outlet one-way valve, and an intermittent extrusion device. The inflatable ball is mounted on the hopper. The inlet one-way valve and the outlet one-way valve are arranged opposite each other at both ends of the inflatable ball. The inlet end of the main gas pipe is connected to the outlet one-way valve, and the other end is connected to the nozzle. The intermittent extrusion device is connected to the inflatable ball and can apply pressure to the ball in a regular manner to force the ball to compress and then rebound.

[0013] Furthermore, the intermittent extrusion device includes a mounting bracket, a first rotating shaft, a roller, a driving wheel, a second rotating shaft, a driven wheel, a cam, and a transmission gear set. The mounting bracket is mounted on the hopper. The first rotating shaft and the second rotating shaft are rotatably mounted on the mounting bracket. The roller and the driving wheel are both sleeved and fixed on the first rotating shaft, and the roller can roll in contact with the material. The driven wheel and the cam are sleeved and fixed on the second rotating shaft, and the driven wheel meshes with the driving wheel through the transmission gear set. When the material falls through the discharge trough, the cam can pressurize the inflatable ball once.

[0014] Furthermore, an elastic support net is provided inside the inflatable ball.

[0015] Furthermore, the stripping device also includes an air storage chamber, the outlet end of the main air pipe is connected to the air storage chamber, the air storage chamber is connected to multiple branch air pipes, the bottom of the air storage chamber is provided with a sliding groove, the sliding groove is perpendicular to the conveying direction of the strip material, the sliding groove is perpendicular to the conveying direction of the strip material, there are multiple nozzles, each nozzle is provided with a slider at the top, the slider can slide and engage with the sliding groove, and the nozzles are connected to the branch air pipes one by one.

[0016] The beneficial effects of this utility model are:

[0017] The above-mentioned rotary die-cutting machine has the following advantages:

[0018] 1. Significantly improves waste stripping efficiency

[0019] By incorporating a synergistic structure of a collection hopper and a stripping device, the stripping device actively presses the adhering material into the discharge trough through periodic impacts as the material passes through. Compared to traditional solutions that rely solely on gravity discharge, this design effectively solves the problem of waste residue, and is particularly suitable for stripping highly viscous or lightweight waste, significantly improving the integrity and efficiency of waste collection.

[0020] 2. Automated material feeding reduces manual intervention.

[0021] By coordinating periodic impact actions with the conveyor belt, waste materials are automatically stripped and collected, eliminating the need for frequent manual cleaning of residual waste materials, reducing labor costs, and improving the continuity and stability of the production line.

[0022] 3. Simple and reliable structure, easy to maintain

[0023] The integrated design of the hopper and stripping device eliminates the need for a complex drive mechanism, resulting in a compact overall structure, low failure rate, and easy operation as maintenance only requires checking the impact components or cleaning the leakage trough.

[0024] 4. Adaptable to different process requirements

[0025] The periodic operation frequency of the stripping device can be adjusted according to the material speed or waste characteristics, making it highly versatile and able to flexibly adapt to the production requirements of diverse die-cut products. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of this utility model, the accompanying drawings used in the specific embodiments will be briefly described below. In all the drawings, the elements or parts are not necessarily drawn to scale.

[0027] Figure 1 This is a schematic diagram of a circular die-cutting machine according to an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Diagram of direction A in the middle;

[0029] Figure 3 for Figure 1 A schematic diagram at point B in the middle;

[0030] Figure 4 for Figure 1 A schematic cross-sectional view of an inflatable balloon in a rotary die-cutting machine;

[0031] Figure label:

[0032] 100. Main frame; 200. Die-cutting unit; 300. Material discharge and collection unit; 310. Material hopper; 320. Stripping device; 321. Nozzle; 322. Intermittent gas generator; 3221. Inflatable ball; 3222. Main air pipe; 3223. Intermittent extrusion device; 3224. Mounting bracket; 3225. Roller; 3226. Drive wheel; 3227. Driven wheel; 3228. Cam; 3229. Transmission gear set. Detailed Implementation

[0033] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of the present invention. However, the present invention can be practiced in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention; therefore, the invention is not limited to the specific embodiments disclosed below.

[0034] Please see Figures 1 to 4 This utility model provides a circular die-cutting machine, including a main frame 100, an unwinding unit, a deviation correction system, a tension control system, a die-cutting unit 200, a discharge and collection unit 300, a winding unit, and a control system. The discharge and collection unit 300 includes a collection hopper 310 and a peeling device 320.

[0035] The collecting hopper 310 is located at the discharge end of the die-cutting unit 200 and below the strip 1. A material discharge groove is provided on the top of the collecting hopper 310. The peeling device 320 is located above the strip 1. As the strip 1 passes through the material discharge groove, the peeling device 320 can periodically impact the material falling on the strip 1 to press the material into the material discharge groove.

[0036] During use, when the die-cutting machine passes through the feed trough, the waste material (dropped material) generated during die-cutting naturally hangs down due to gravity. As it passes through the feed trough, the dropped material automatically falls into it, and the peeling device 320 uses periodic impact actions to press the dropped material adhering to the feed 1 into the feed trough. This avoids incomplete material discharge.

[0037] The aforementioned circular die-cutting machine uses impact force to assist in material release, solving the problem of waste residue when relying on gravity for material discharge in the traditional method. The time and space coordination between the material discharge trough and the stripping device 320 significantly improves waste collection efficiency and reduces the frequency of manual cleaning.

[0038] Specifically, the stripping device 320 includes a nozzle 321 and an intermittent gas generator 322. The nozzle 321 is located above and aligned with the material discharge trough. The intermittent gas generator 322 is connected to the nozzle 321 and is used to periodically supply gas to the nozzle 321 to impact the falling material into the collection hopper 310.

[0039] In use, when the intermittent gas generator 322 generates gas, the gas is sprayed onto the material dropper through the nozzle 321. The airflow impacts the material dropper, pushing it into the discharge trough. This non-hard contact peeling method avoids damage to the surface of the strip 1 and also avoids affecting the normal operation of the strip 1.

[0040] In practice, the frequency and intensity of the pulsed airflow can be adjusted as needed to adapt to the stripping requirements of different materials.

[0041] In this embodiment, the intermittent gas generator 322 includes an inflation ball 3221, a main air pipe 3222, an inlet check valve, an outlet check valve, and an intermittent compression device 3223. The inflation ball 3221 is mounted on the collection hopper 310 and is made of rubber. It contracts under pressure and expands upon rebound. The inlet check valve and the outlet check valve are positioned opposite each other at both ends of the inflation ball 3221. The inlet end of the main air pipe 3222 is connected to the outlet check valve, and the other end is connected to the nozzle 321. The intermittent compression device 3223 is connected to the inflation ball 3221 and can apply pressure to the balloon regularly, forcing the balloon to compress and then rebound.

[0042] In practical implementation, the regularity of the intermittent extrusion device 3223 should be matched with the conveying speed of the conveyor belt 1. When it is pressurized, the material falling should just pass through the material discharge trough. Through the regular extrusion of the inflatable balloon 3221, the gas is forced to be ejected in a direction and impact the auxiliary discharge.

[0043] Specifically, the intermittent extrusion device 3223 includes a mounting bracket 3224, a first rotating shaft, a roller 3225, a drive wheel 3226, a second rotating shaft, a driven wheel 3227, a cam 3228, and a transmission gear set 3229. The mounting bracket 3224 is mounted on the collecting hopper 310. The first and second rotating shafts are rotatably mounted on the mounting bracket 3224. The roller 3225 and the drive wheel 3226 are both sleeved and fixed on the first rotating shaft, and the roller 3225 can roll contact with the material 1. The driven wheel 3227 and the cam 3228 are sleeved and fixed on the second rotating shaft, and the driven wheel 3227 meshes with the drive wheel 3226 through the transmission gear set 3229. When the material falls through the discharge chute, the cam 3228 can pressurize the inflation ball 3221.

[0044] When the belt 1 moves, the roller 3225 rotates with the belt 1 and drives the drive wheel 3226 through the first rotating shaft; the gear transmits the rotation speed of the drive wheel 3226 to the driven wheel 3227, which drives the cam 3228 to rotate; the cam 3228 squeezes the inflatable ball 3221 once for every one rotation, realizing the airflow injection synchronized with the conveying of the belt 1.

[0045] This method eliminates the need for additional power in mechanical linkage, resulting in energy savings and high synchronization. The shape of the cam 3228 can be customized to optimize the extrusion stroke and gas injection volume.

[0046] As an effective implementation method, an elastic support mesh woven from stainless steel wire can be embedded inside the inflatable ball 3221. This mesh contracts evenly under pressure, preventing localized deformation and breakage. The increased rebound speed ensures stability under high-frequency extrusion.

[0047] As another preferred embodiment, the stripping device 320 also includes an air storage chamber. The air outlet of the main air pipe 3222 is connected to the air storage chamber. The air storage chamber is connected to multiple branch air pipes. A chute is provided at the bottom of the air storage chamber. The chute is perpendicular to the conveying direction of the strip 1. There are multiple nozzles 321. A slider is provided at the top of each nozzle 321. The slider can slide and engage with the chute. The nozzles 321 are connected to the branch air pipes one by one.

[0048] Multiple nozzles 321 cover a wider die-cutting area, avoiding airflow blind spots; the position of nozzles 321 can be flexibly adjusted to adapt to diverse product needs.

[0049] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model, and they should all be covered within the scope of the claims and specification of this utility model.

Claims

1. A rotary knife die cutting machine comprising a main frame, a unwinding unit, a deviation rectifying system, a tension control system, a die cutting unit, a material discharging and collecting unit and a winding unit, characterized in that, The discharge collection unit includes: A material collection hopper is located at the discharge end of the die-cutting unit and below the conveyor belt; a material discharge groove is provided on the top of the material collection hopper. A stripping device is disposed above the conveyor belt. As the conveyor belt passes through the discharge trough, the stripping device can periodically impact the material falling off the conveyor belt to press the material falling off into the discharge trough.

2. The circular knife die cutter of claim 1, wherein, The stripping device includes a nozzle and an intermittent gas generator. The nozzle is located above and aligned with the material discharge trough. The intermittent gas generator is connected to the nozzle and is used to periodically supply gas to the nozzle to impact the falling material into the collection hopper.

3. The circular knife die of claim 2, wherein, The intermittent gas generator includes an inflatable ball, a main gas pipe, an inlet one-way valve, an outlet one-way valve, and an intermittent extrusion device. The inflatable ball is mounted on the hopper. The inlet one-way valve and the outlet one-way valve are positioned opposite each other at both ends of the inflatable ball. The inlet end of the main gas pipe is connected to the outlet one-way valve, and the other end is connected to the nozzle. The intermittent extrusion device is connected to the inflatable ball and can apply pressure to the ball in a regular manner, forcing the ball to compress and then rebound.

4. The circular knife die of claim 3 wherein, The intermittent extrusion device includes a mounting bracket, a first rotating shaft, rollers, a drive wheel, a second rotating shaft, a driven wheel, a cam, and a transmission gear set. The mounting bracket is mounted on the hopper. The first and second rotating shafts are rotatably mounted on the mounting bracket. The rollers and the drive wheel are both sleeved and fixed on the first rotating shaft, and the rollers can roll in contact with the material. The driven wheel and the cam are sleeved and fixed on the second rotating shaft, and the driven wheel meshes with the drive wheel through the transmission gear set. When the material passes through the discharge trough, the cam can pressurize the inflatable ball once.

5. The circular knife die of claim 3 wherein, An elastic support net is installed inside the inflatable ball.

6. The circular knife die of claim 3 wherein, The stripping device also includes an air storage chamber, the outlet end of the main air pipe is connected to the air storage chamber, the air storage chamber is connected to multiple branch air pipes, the bottom of the air storage chamber is provided with a sliding groove, the sliding groove is perpendicular to the conveying direction of the strip material, the sliding groove is perpendicular to the conveying direction of the strip material, there are multiple nozzles, each nozzle is provided with a slider at the top, the slider can slide and engage with the sliding groove, and the nozzles are connected to the branch air pipes one by one.

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