A cutting knife assembly structure of a printing die cutter

Abstract

The utility model discloses a printing die -cutting machine's cutting knife subassembly structure, solves existing cutting knife easy deviation, damage's problem. It includes frame, tool rest, cutting knife, laser displacement sensor, PLC controller and rectification mechanism, frame is set vertical guide rail, tool rest is connected main drive cylinder, and cutting knife is equipped with rectification mechanism of servo electric cylinder (cylinder body connects tool rest, piston rod is connected cutting knife through ball hinge) of rectangular distribution and is installed under tool rest, at least three groups of laser displacement sensor measure cutting knife position, and PLC controller is connected sensor through signal conditioning circuit, is connected servo motor driver through servo drive circuit, is connected main drive cylinder solenoid valve through hydraulic control circuit, and built -in module compares position, and PID adjusts to correct cutting knife path, still contains pressure sensor (overpressure shutdown), linear bearing and electric grease pump (lubrication). The structure can correct cutting knife glide path, reduce deviation, avoid the damage of cutter body, improve die -cutting precision and equipment life.

Description

Technical Field

[0001] This utility model provides a cutter assembly structure, and particularly relates to a cutter assembly structure for a printing die-cutting machine. Background Technology

[0002] The cutting assembly of a printing die-cutting machine is the core component for achieving precise cutting of the substrate. It separates the printed substrate according to a preset size through the vertical movement of the cutter and its cooperation with the die-cutting plate. Existing cutting assemblies typically consist of a frame, a cutter holder, a cutter, and a drive mechanism. The cutter holder slides along the vertical guide rail of the frame and is driven by the main drive cylinder to complete the reciprocating motion.

[0003] However, the existing structure has the following shortcomings: First, it lacks a real-time position monitoring mechanism, making it unable to detect horizontal deviations and vertical tilts caused by guide rail wear, assembly errors, or uneven force during the cutter's descent. It relies solely on passive guidance from the mechanical guide rail, which can easily lead to die-cutting misalignment. Second, it lacks a dynamic correction function, and cannot actively adjust the cutter's posture after deviations occur, which may cause the cutter to collide with the die-cutting plate, resulting in damage to the cutter body. Third, it lacks intelligent protection and lubrication design, and cannot stop the machine in time when the cutter is subjected to abnormal force. Furthermore, guide rail lubrication relies on manual operation, and fluctuations in motion resistance further exacerbate path deviations, making it difficult to meet the requirements of high-precision production. Utility Model Content

[0004] The purpose of this invention is to overcome the defects of the prior art and provide a cutting component structure for a printing die-cutting machine, so as to realize the self-correction of the cutting path, reduce deviation, and avoid damage to the blade body due to misalignment.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A cutting assembly structure for a printing die-cutting machine includes a frame, a cutting holder, a cutting blade, laser displacement sensors, a PLC controller, and a correction mechanism. The frame is equipped with a vertical guide rail, and the cutting holder is slidably connected to the vertical guide rail and connected to a main drive cylinder, which drives the cutting holder to reciprocate along the guide rail. The cutting blade is mounted on the bottom of the cutting holder via the correction mechanism. At least three sets of laser displacement sensors are mounted on the frame, corresponding to at least two sides of the cutting blade, for real-time detection of the cutting blade edge position coordinates. The PLC controller is installed in the electrical control box of the frame.

[0007] The correction mechanism includes at least four servo electric cylinders and a servo motor driver; the servo electric cylinders are rectangularly distributed between the tool holder and the cutter, with their cylinder bodies fixedly connected to the tool holder and the piston rod ends connected to the top surface of the cutter via ball joints; the servo motor drivers are electrically connected to the servo electric cylinders one-to-one.

[0008] In terms of circuit connections: the laser displacement sensor is electrically connected to the signal input terminal of the PLC controller through the signal conditioning circuit; the servo motor driver is electrically connected to the control output terminal of the PLC controller through the servo drive circuit; and the solenoid valve of the main drive cylinder is electrically connected to the execution output terminal of the PLC controller through the hydraulic control circuit.

[0009] The PLC controller has a built-in path comparison module and a PID adjustment module: the path comparison module compares the real-time position coordinates detected by the laser displacement sensor with the preset standard path and calculates the deviation value; the PID adjustment module outputs an adjustment signal to the servo motor driver according to the deviation value, and corrects the downward path of the cutter by controlling the extension and retraction of the servo electric cylinder.

[0010] Furthermore, the laser displacement sensor includes two sets of horizontal detection sensors and one set of vertical detection sensors; the horizontal detection sensors are symmetrically arranged on both sides of the cutter to detect horizontal deviation; the vertical detection sensor is arranged in front of the cutter to detect vertical tilt deviation.

[0011] Furthermore, it also includes a pressure sensor, which is installed at the end of the piston rod of the servo electric cylinder to detect the pressure value between the cutter and the blade holder; the pressure sensor is electrically connected to the signal input terminal of the PLC controller through a signal amplification circuit, and the PLC controller has a built-in pressure protection module. When the pressure value exceeds a preset threshold, the power output of the main drive cylinder is cut off through the hydraulic control circuit.

[0012] Furthermore, the servo drive circuit includes a pulse generating circuit, a direction control circuit, and a power amplifier circuit; the pulse generating circuit is connected to the pulse output terminal of the PLC controller, the direction control circuit is connected to the direction control terminal of the PLC controller, and the power amplifier circuit is connected to the pulse generating circuit, the direction control circuit, and the servo motor driver respectively.

[0013] Furthermore, the signal conditioning circuit includes a filter circuit, a range conversion circuit, and an A / D conversion circuit connected in sequence, with the output terminal of the A / D conversion circuit connected to the analog input terminal of the PLC controller.

[0014] Furthermore, a linear bearing is provided between the tool holder and the vertical guide rail, and a grease filling channel is provided on the outside of the linear bearing. The filling channel is connected to an electric grease pump, which is electrically connected to a PLC controller through a relay control circuit.

[0015] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages compared with the prior art:

[0016] A. Achieve path self-correction: The laser displacement sensor detects the cutter position in real time, and combined with the path comparison and PID adjustment of the PLC controller, the servo electric cylinder is driven to dynamically adjust the cutter posture, effectively correcting horizontal offset and vertical tilt, and reducing die-cutting deviation;

[0017] B. Protecting the blade: A pressure sensor, in conjunction with a pressure protection module, can promptly cut off the main circuit when the cutter is subjected to abnormal force.

[0018] Drive the cylinder to prevent the blade from being damaged by impact;

[0019] C. Improved operational stability: The lubrication system, consisting of linear bearings and an electric grease pump, reduces motion resistance and minimizes mechanical factors caused by deviations. Combined with closed-loop control logic, it significantly improves die-cutting accuracy and equipment lifespan.

[0020] Other advantages, objectives and features of this invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination or study, or may be taught from the practice of this invention. Attached Figure Description

[0021] Figure 1 This is an assembly diagram of the cutting blade assembly structure of a printing die-cutting machine according to the present invention;

[0022] Figure 2 This is an electrical connection diagram of the cutting blade assembly structure of a printing die-cutting machine according to the present invention;

[0023] Figure 3 This is a schematic diagram of the electronic component connections of the cutting assembly structure of a printing die-cutting machine according to the present invention.

[0024] As shown in the figure:

[0025] 1. Frame; 2. Tool holder; 3. Cutting blade; 4. Laser displacement sensor; 5. PLC controller; 6. Servo electric cylinder; 7. Servo motor driver; 8. Main drive cylinder; 9. Servo drive circuit; 10. Hydraulic control circuit; 11. Signal conditioning circuit. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the terms "vertical," "horizontal," "up," "down," "left," "right," and similar expressions used in this article are for illustrative purposes only and do not represent the only possible implementation.

[0028] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention; the term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0029] like Figure 1-3 As shown, the cutting blade assembly structure of the printing die-cutting machine of this utility model includes: a frame with high-precision guide rails vertically arranged on both sides; a blade holder slidably connected to the guide rails via linear bearings, and connected at the top to the piston rod of the main drive cylinder, the main drive cylinder being a double-acting hydraulic cylinder fixed to the top of the frame; and a cutting blade installed at the bottom of the blade holder via a correction mechanism. The correction mechanism uses four servo electric cylinders, arranged in a rectangle at the four corners of the bottom surface of the blade holder. The cylinder bodies of the servo electric cylinders are fixed to the blade holder with bolts, and the piston rod ends are hinged to the connecting seat on the top surface of the cutting blade via ball joints, ensuring that the cutting blade can be flexibly adjusted in both horizontal and tilt directions.

[0030] The laser displacement sensor uses three sets: two sets of horizontal detection sensors (model HL-G103-A-C5) are symmetrically installed on the brackets on both sides of the frame, with the detection end aligned with the left and right sides of the cutter to detect horizontal deviation; one set of vertical detection sensors (model HL-G103-A-C5) is installed on the crossbeam at the front of the frame, with the detection end aligned with the front end of the cutter to detect vertical tilt deviation.

[0031] The PLC controller uses a Siemens S7-1200 series and is installed in the electrical control box on the side of the rack. Its signal input terminal is connected to the laser displacement sensor through a signal conditioning circuit, which includes an RC filter circuit (to filter out high-frequency interference), a range conversion circuit (using an ADG708 chip), and an A / D conversion circuit (using an ADS1115 chip). The control output terminal is connected to a servo motor driver (model MR-JE-10A) through a servo drive circuit. The servo drive circuit is connected to a pulse generation circuit through the PLC's high-speed pulse output terminal (Q0.0-Q0.3), and the digital output terminal (Y0-Y3) is connected to the direction control circuit. Both are driven by a power amplifier circuit (using an IR2104 chip) to drive the servo motor driver. The execution output terminal is connected to the solenoid valve of the main drive cylinder through a hydraulic control circuit (including an electromagnetic directional valve 4WE6J6X).

[0032] A pressure sensor (model PT124G-111) is embedded in the piston rod end of the servo electric cylinder. Its signal is transmitted to the analog input terminal of the PLC controller via a signal amplification circuit (using an INA128 chip). The linear bearing of the tool holder has an annular grease filling channel on its outer side, connected to an electric grease pump (model 2ZBQ-5) via a pipeline. The grease pump is controlled by a relay circuit (using a Schneider RXM2LB2BD relay) connected to the PLC controller to achieve timed automatic lubrication.

[0033] It should be noted that, Figure 3 In the middle, the three sets of terminal modules on the top left: the signal input interface of the laser displacement sensor (corresponding to the interface for transmitting detection signals to the 4-way signal conditioning circuit 11 of the laser displacement sensor);

[0034] The black module marked "1658" in the middle on the left: Pulse generation circuit module (belonging to servo drive circuit 9, used to generate pulse signals to control the servo electric cylinder);

[0035] The two black modules with pins on the right side of the pulse generation circuit are: servo motor driver modules (corresponding to servo motor driver 7, which are electrically connected to servo electric cylinder 6 in a one-to-one correspondence);

[0036] The area marked "Pulse Direction" represents the transmission path of the pulse and direction control signals (connecting the pulse generator, direction control circuit, and subsequent power amplification modules).

[0037] The module labeled "Direction Control Circuit" on the lower left: Direction Control Circuit (belongs to Servo Drive Circuit 9, connected to the direction control terminal of PLC Controller 5, and controls the movement direction of the servo electric cylinder);

[0038] The two modules marked "16Li" below are: the A / D conversion module in the signal conditioning circuit (corresponding to the A / D conversion part of the signal conditioning circuit 11, which converts the analog signal of the laser displacement sensor into a digital signal for input to the PLC);

[0039] The middle set of terminal blocks: signal conversion and distribution terminals (used for signal connection and distribution between various electrical modules to realize circuit interaction);

[0040] The module with a display screen and interface on the upper right: PLC controller module (corresponding to PLC controller 5, with built-in path comparison, PID adjustment and other modules, which process detection signals and output control commands);

[0041] The multi-pin module in the middle on the right: power amplifier circuit module (belonging to servo drive circuit 9, amplifies the control signal output by the PLC to drive the servo motor driver);

[0042] The rightmost module with an arrow and multiple interfaces: the power interface for the servo motor driver (hydraulic system, which is the module in hydraulic control circuit 10 that drives the solenoid valve of the main drive cylinder 8).

[0043] During operation, the main drive cylinder drives the cutter holder, causing the cutter to slide down the guide rail. The laser displacement sensor collects the cutter's position coordinates in real time, which are then transmitted to the PLC controller via the signal conditioning circuit. The path comparison module compares the real-time coordinates with the preset standard path (stored in the PLC memory) and calculates the horizontal and tilt deviation values. The PID adjustment module outputs pulse and direction signals to the corresponding servo motor driver based on the deviation value, controlling the extension and retraction of the servo electric cylinder (e.g., when the cutter deviates to the left, the left servo electric cylinder extends and the right cylinder shortens) to correct the cutter path. When the pressure sensor detects that the pressure exceeds the threshold (e.g., 10MPa), the pressure protection module cuts off the oil supply to the main drive cylinder through the hydraulic control circuit, stopping the cutter's movement and achieving protection.

[0044] In actual operation, this device needs to be used in conjunction with the substrate conveying roller group in the existing technology. This roller group consists of a driving roller and a driven roller, and the continuous conveying of the substrate is achieved through synchronous belt drive. Its surface is usually covered with nitrile rubber to increase the friction with the substrate and ensure that the substrate does not slip during the conveying process.

[0045] The blade of the cutter needs to be made of high-speed steel or cemented carbide. These materials have high hardness and wear resistance, which can meet the needs of continuous cutting for a long time. The body of the blade can be made of No. 45 carbon structural steel, which has both strength and toughness after heat treatment, to prevent breakage due to excessive force during cutting.

[0046] The main frame of the machine should be welded from gray cast iron or Q235 carbon structural steel. Gray cast iron has good shock absorption and rigidity, while Q235 steel is easy to process and weld. Both can ensure the structural stability of the machine frame when bearing components such as the tool holder and drive cylinder.

[0047] The working surface of the vertical guide rail must be made of chrome-plated alloy steel, with the chrome plating thickness controlled at 0.05-0.1mm. This can improve surface hardness and wear resistance, and reduce the coefficient of friction when the tool holder slides. The connection between the guide rail and the frame must be fastened with hexagonal bolts. The bolts should be made of 304 stainless steel to prevent rust during long-term use.

[0048] In addition, the device also needs to be equipped with a tension control system based on existing technology. This system consists of a tension sensor, a magnetic powder brake, and a controller, which can adjust the tension of the substrate in real time to avoid die-cutting position deviation caused by substrate stretching or relaxation. An air switch and a surge protector need to be installed inside the electrical control box. The air switch is selected from the DZ47 series to realize circuit overload protection, and the surge protector is used to suppress instantaneous high voltage in the power grid and protect precision electrical components such as PLC controller and servo motor driver.

[0049] To facilitate monitoring and debugging by operators, the device needs to be equipped with a human-machine interface touch screen. This screen is connected to the PLC controller via an RS485 communication interface and can display parameters such as cutter position coordinates, deviation values, and pressure values ​​in real time. It also supports manual input of preset standard paths, pressure thresholds, and other parameters. The touch screen shell is made of ABS engineering plastic and covered with scratch-resistant tempered glass to adapt to the complex environment of the workshop.

[0050] Finally, anti-vibration pads need to be installed at the bottom of the device. The pads are made of neoprene rubber with a Shore hardness of 60-70 degrees, which can effectively absorb the vibration generated when the main drive cylinder is working, and prevent the vibration from being transmitted to the ground and causing resonance of surrounding equipment, thus affecting the overall operational stability.

[0051] Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be determined by the claims.

Claims

1. A cutting blade (3) assembly structure for a printing die-cutting machine, characterized in that, include: A frame (1) is provided with vertical guide rails; The tool holder (2) is slidably connected to the vertical guide rail. The tool holder (2) is connected to a main drive cylinder (8). The main drive cylinder (8) is used to drive the tool holder (2) to reciprocate along the vertical guide rail. The cutter (3) is mounted on the bottom of the cutter holder (2) via a correction mechanism; At least three sets of laser displacement sensors (4) are mounted on the frame (1) and respectively set on at least two sides of the cutter (3) to detect the position coordinates of the edge of the cutter (3) in real time; The PLC controller (5) is installed in the electrical control box of the rack (1); The correction mechanism includes: At least four servo electric cylinders (6) are arranged in a rectangular pattern between the tool holder (2) and the cutter (3). The cylinder body of the servo electric cylinder (6) is fixedly connected to the tool holder (2), and the end of the piston rod is connected to the top surface of the cutter (3) through a ball joint. The servo motor driver (7) is electrically connected to the servo electric cylinder (6) in a one-to-one correspondence; The laser displacement sensor (4) is electrically connected to the signal input terminal of the PLC controller (5) through the signal conditioning circuit (11), the servo motor driver (7) is electrically connected to the control output terminal of the PLC controller (5) through the servo drive circuit (9), and the solenoid valve of the main drive cylinder (8) is electrically connected to the execution output terminal of the PLC controller (5) through the hydraulic control circuit (10). The PLC controller (5) has a built-in path comparison module and a PID adjustment module. The path comparison module compares the real-time position coordinates detected by the laser displacement sensor (4) with the preset standard path to calculate the deviation value. The PID adjustment module outputs an adjustment signal to the corresponding servo motor driver (7) according to the deviation value, and corrects the downward path of the cutter (3) by controlling the extension and retraction of the servo electric cylinder (6).

2. The cutter (3) assembly structure of the printing die-cutting machine according to claim 1, characterized in that, The laser displacement sensor (4) includes two sets of horizontal detection sensors and one set of vertical detection sensors. The horizontal detection sensors are symmetrically arranged on both sides of the cutter (3) to detect horizontal deviations, and the vertical detection sensors are arranged in front of the cutter (3) to detect vertical tilt deviations.

3. The cutter (3) assembly structure of the printing die-cutting machine according to claim 1, characterized in that, Also includes: A pressure sensor is installed at the end of the piston rod of the servo electric cylinder (6) to detect the pressure value between the cutter (3) and the tool holder (2); The pressure sensor is electrically connected to the signal input terminal of the PLC controller (5) through a signal amplification circuit. The PLC controller (5) also has a built-in pressure protection module. When the pressure value exceeds the preset threshold, the power output of the main drive cylinder (8) is cut off through the hydraulic control circuit (10).

4. The cutter (3) assembly structure of the printing die-cutting machine according to claim 1, characterized in that, The servo drive circuit (9) includes: The pulse generating circuit is connected to the pulse output terminal of the PLC controller (5); The direction control circuit is connected to the direction control terminal of the PLC controller (5); The power amplifier circuit is connected to the pulse generation circuit, the direction control circuit and the servo motor driver (7), respectively.

5. The cutter (3) assembly structure of the printing die-cutting machine according to claim 1, characterized in that, The signal conditioning circuit (11) includes a filter circuit, a range conversion circuit and an A / D conversion circuit connected in sequence. The output terminal of the A / D conversion circuit is connected to the analog input terminal of the PLC controller (5).

6. The cutter (3) assembly structure of the printing die-cutting machine according to claim 1, characterized in that, A linear bearing is provided between the tool holder (2) and the vertical guide rail. A grease filling channel is provided on the outside of the linear bearing. An electric grease pump is connected to the grease filling channel. The electric grease pump is electrically connected to the PLC controller (5) through a relay control circuit.

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