A full-automatic slitting machine general control circuit

Abstract

This utility model discloses a fully automatic slitting machine control circuit, comprising an AC power input module, a DC power input module, a PLC control module, an auxiliary control circuit module, a main circuit module, and an external equipment module. The AC power input module includes three-phase power interfaces R1S, S1S, and T1S, a neutral interface N, a protective grounding interface PE1, and a main fuse. The DC power input module includes a 24V interface, a 0V interface, and a protective grounding interface PE. The PLC control module has a power interface, an input interface, and an output interface. The main circuit module includes three motor drive branches, each branch consisting of a circuit breaker, a contactor, and a motor connected in series. This modular design of the fully automatic control circuit clearly separates AC power supply, DC power supply, main drive, and external equipment control functions. The fully automatic control of the slitting machine can be achieved through the coordinated work of each module. At the same time, the main fuse provides overcurrent protection for the entire AC power supply system, improving the safety of circuit operation.

Description

Technical Field

[0001] This utility model relates to the field of electronic circuits, and in particular to a master control circuit for a fully automatic slitting machine. Background Technology

[0002] Fully automatic slitting machines are core equipment in the processing of flexible materials such as metal coils and films. They require the coordinated action of multiple components, including cutter shaft cutting, clamping roller conveying, and winding machine take-up, to slit wide raw materials into narrow coils that meet downstream production needs. They are widely used in industries such as building materials, electronics, and packaging. The main control circuit, as the control center and power core of the slitting machine, directly determines the slitting accuracy, operational stability, and safety of the equipment. However, current slitting machine main control circuits on the market have many technical defects, directly corresponding to the design goals of the technical solution in this application.

[0003] The existing slitting machine's main control circuit generally lacks clear module division, with AC main circuit, DC control circuit, and auxiliary indicator circuit lines mixed together. This not only leads to a chaotic circuit layout and makes it extremely difficult to troubleshoot the circuit during later maintenance, but also causes distortion of weak current signals due to electromagnetic interference generated by the operation of the high-voltage circuit, which in turn causes deviations in slitting length. At the same time, the high-voltage and weak-voltage circuits are not physically isolated, posing a risk of electric shock.

[0004] In terms of protection mechanisms, existing circuits mostly only have a single circuit breaker at the motor end of the main circuit, lacking a total protection component on the AC side. If there is voltage fluctuation or short circuit in the three-phase power supply, it is easy to directly burn out core components such as contactors and motors. Furthermore, the DC control circuit and auxiliary indicator circuit are not equipped with independent protection. Once the sensor is short-circuited or the indicator light fails, it can easily lead to the paralysis of the entire control system and prolong the equipment downtime.

[0005] Furthermore, the control logic of existing circuits is scattered, and a unified control system with PLC as the core has not been formed. The signal acquisition of sensors and status switches and the control command output of relays and motors lack a clear correspondence. The start and stop of multiple components require manual adjustment, which cannot achieve fully automatic coordinated operation. This reduces production efficiency and is prone to equipment failure due to operational errors, making it difficult to meet the downstream industry's demand for high-precision and high-stability cutting and processing. Utility Model Content

[0006] The purpose of this invention is to provide a fully automatic slitting machine control circuit to solve the problems existing in the prior art.

[0007] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0008] A fully automatic slitting machine control circuit includes an AC power input module, a DC power input module, a PLC control module, an auxiliary control loop module, a main loop module, and an external device module; the AC power input module includes three-phase power interfaces R1S, S1S, and T1. The PLC consists of a neutral wire interface (S), a protective grounding interface (PE1), and a main fuse, which supplies power to both the auxiliary control circuit module and the main circuit module. The DC power input module includes a 24V interface, a 0V interface, and a protective grounding interface (PE). This DC power supply provides DC power to the PLC control module and the external device module. The PLC control module has a power interface, an input interface, and an output interface. The power interface connects to the DC power supply, the input interface connects to sensors or status switches of external devices, and the output interface connects to relays of external devices. The auxiliary control circuit module includes three indicator lights and an auxiliary fuse. The indicator lights are connected in parallel between the AC power supply and the neutral wire. The main circuit module includes three motor drive branches, each consisting of a circuit breaker, a contactor, and a motor connected in series. The motor casing is connected to the protective ground. The external device module includes sensors, status switches, and relays, which are electrically connected to the PLC's input and output interfaces, respectively.

[0009] By adopting the above technical solution, a modular design of the fully automatic main control circuit is realized, which clearly separates the functions of AC power supply, DC power supply, logic control, auxiliary indication, main drive and external equipment control. This facilitates circuit layout and installation, and enables fully automatic control of the slitting machine through the coordinated work of each module. At the same time, the main fuse can provide overcurrent protection for the entire AC power supply system, improving the safety of circuit operation.

[0010] In a further embodiment, in the AC power input module, the input terminals of the three-phase power interfaces R1S, S1S, and T1S are connected to the external three-phase AC power grid, and the output terminals are connected to the input terminals of the main fuse. The main fuse is a three-phase fuse, and its output terminals are divided into two paths: one path is connected to the auxiliary control circuit module, and the other path is connected to the input terminals of each circuit breaker in the main circuit module through branch wires. The neutral wire interface N is directly introduced to form a 230V AC power supply circuit with the three-phase power interfaces. The protective grounding interface PE1 is connected to the metal casing of all AC equipment in the system and is finally connected to the grounding electrode.

[0011] By adopting the above technical solutions, three-phase AC power can be safely and stably connected to the system. The branch circuit design of the main fuse can provide protection for the auxiliary control circuit and the main circuit respectively. The 230V circuit formed by the neutral wire and the three-phase power supply meets the power supply requirements of AC auxiliary components. The connection between the protective grounding interface and the casing of all AC equipment realizes leakage protection through the grounding body, further ensuring the safety of equipment and operators.

[0012] In a further embodiment, the 24V interface of the DC power input module is connected to the positive power interface of the PLC control module, and the 0V interface is connected to the negative power interface of the PLC control module; the protective ground interface PE is connected to the grounding terminal of the PLC control module and finally connected to the system grounding body; the 24V interface and the 0V interface are also connected to the positive and negative power terminals of all sensors and the power supply terminals of relay coils in the external device module, respectively, forming an independent DC power supply circuit.

[0013] By adopting the above technical solution, an independent DC power supply system was constructed, which can provide a stable working power supply for the PLC control module to ensure the normal implementation of its logic operation function, and provide a unified DC power supply for the sensors and relays in the external equipment module, ensuring the accuracy of signal acquisition and control command execution. At the same time, the setting of protective grounding can effectively avoid interference in the DC circuit and improve control accuracy.

[0014] In a further embodiment, the PLC control module adopts a DC-powered programmable logic controller with a power interface input voltage of DC 24V; the input interface includes 7 independent signal input terminals, namely I0.0, I0.1, I0.2, I0.3, I0.4, I0.5, and I0.6, where I0.0 is connected to the A-phase signal output terminal of the length measuring encoder, I0.1 is connected to the B-phase signal output terminal of the length measuring encoder, I0.2 is connected to the ready signal terminal of the cutter shaft lifting, I0.3 is connected to the fault signal terminal of the cutter shaft lifting, I0.4 is connected to the ready signal terminal of the pinch roll controller, and I0.5 is connected to the ready signal terminal of the winding aid controller. 0.6 Connect to the ready signal terminal of the winding machine controller; the signal loop of each input interface forms a closed loop with the DC 24V interface and the 0V interface; the output interface includes at least 6 independent signal output terminals, namely Q0.0, Q0.1, Q0.2, Q0.3, Q0.4, and Q0.5, and the output type is transistor output.

[0015] By adopting the above technical solution, the PLC control module can accurately acquire the length measuring encoder signal and the status signal of each device through 7 independent input interfaces. The A and B phase signals of the length measuring encoder can realize the accurate measurement of the slitting length, and the readiness and fault signals of each device can provide real-time feedback on the device status. The 6 transistor output interfaces can reliably output control commands to realize the precise control of external relays, providing core logic control support for the fully automatic collaborative operation of the slitting machine.

[0016] In a further embodiment, the three indicator lights of the auxiliary control circuit module are a red indicator light, a yellow indicator light, and a green indicator light, all powered by AC 230V. The first terminal of the red indicator light is connected to the R1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The first terminal of the yellow indicator light is connected to the S1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The first terminal of the green indicator light is connected to the T1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The three indicator lights are connected in parallel to each other and are used to indicate the system power on / off, standby, and running status, respectively. The auxiliary fuse is a single-phase fuse, with the upper terminal connected to the neutral interface N and the lower terminal leading out the neutral line, which cooperates with any phase line after the main fuse to provide overcurrent protection and power circuit for the auxiliary control element.

[0017] By adopting the above technical solution, three indicator lights of different colors can intuitively reflect the power on / off, standby and running status of the system, making it easy for operators to keep track of the equipment's operating status in real time; the parallel design of the indicator lights ensures that the failure of a single indicator light will not affect the operation of other indicator lights, and the auxiliary fuse can provide overcurrent protection for the components of the entire auxiliary control circuit, improving the reliability of the auxiliary control function.

[0018] In a further embodiment, in each motor drive branch of the main circuit module, the circuit breaker is a three-pole circuit breaker with short-circuit protection and overload protection functions. The input terminal is connected to the R1S, S1S, and T1S phase lines of the AC power input module after the main fuse via wires, and the output terminal is connected to the main contact input terminal of the contactor via wires. The contactor is a three-phase AC contactor, and the main contact output terminal is connected to the three-phase terminals of the motor via wires. The control circuit of the contactor coil is connected in series with the corresponding relay main contacts in the external equipment module. The motor is a three-phase asynchronous motor, and the metal casing of the motor is connected to the protective ground via a protective grounding wire.

[0019] By adopting the above technical solutions, each motor drive branch forms a complete control and protection circuit. The three-pole circuit breaker can quickly cut off the power supply when the motor is short-circuited or overloaded, thus protecting the motor. The contactor controls the start and stop of the motor by opening and closing the main contacts. The series design of its coil control circuit and the relay main contacts allows the PLC to indirectly control the motor operation, achieving effective isolation between the high-voltage main circuit and the low-voltage control circuit.

[0020] In a further embodiment, the sensor of the external device module includes a length measuring encoder, which is an incremental encoder with A-phase and B-phase pulse signal output terminals. The A-phase output terminal is connected to the input interface I 0.0 of the PLC control module, and the B-phase output terminal is connected to the input interface I 0.1 of the PLC control module. The positive terminal of the encoder's power supply is connected to a DC 24V interface, and the negative terminal of the power supply is connected to a DC 0V interface, forming a signal acquisition loop. The status switches include multiple status feedback switches of the device controller. The ready status switch signal terminal of the motor is connected to the input interface I 0.2 of the PLC control module, and the fault status switch signal terminal of the motor is connected to the input interface I 0.3 of the PLC control module. The power supply terminals of the status feedback switches are all connected to the DC 24V interface and the 0V interface.

[0021] By adopting the above technical solution, the length encoder can transmit slitting length data to the PLC in real time through A and B phase pulse signals, providing a basis for the precise cutting of the slitting machine; the status feedback switches of each device can accurately transmit the ready and fault status of the motor to the PLC, ensuring that the PLC can keep abreast of the equipment operation status, while the unified DC power supply ensures the stability and accuracy of the sensor and status switch signal acquisition.

[0022] In a further embodiment, the external device module includes six relays: KM1, KM2, KM3, KM4, KM5, and KM6, all of which are 24V DC powered electromagnetic relays. One end of the coil of relay KM1 is connected to the output interface Q0.0 of the PLC control module via a wire; one end of the coil of relay KM2 is connected to the output interface Q0.1 of the PLC control module via a wire; one end of the coil of relay KM3 is connected to the output interface Q0.2 of the PLC control module via a wire; and one end of the coil of relay KM4 is connected to the output interface Q0.3 of the PLC control module via a wire. One end of the coil of relay KM5 is connected to the output interface Q0.4 of the PLC control module via a wire, and one end of the coil of relay KM6 is connected to the output interface Q0.5 of the PLC control module via a wire; the other end of all relay coils is connected to the DC 0V interface via a wire to form a control circuit; the main contacts of each relay are connected in series in the control coil circuit of the corresponding contactor in the main circuit module, wherein the main contacts of KM1, KM2, and KM3 control the on / off of the forward coil of the contactor in the three motor drive branches respectively, and the main contacts of KM4, KM5, and KM6 control the on / off of the reverse coil of the contactor in the three motor drive branches respectively.

[0023] By adopting the above technical solution, the six relays are connected one-to-one with the PLC output interface, realizing the transmission of PLC control commands to the main circuit contactor. The control circuit formed by the relay coil and DC 0V ensures that the PLC can reliably control the on and off of each contactor, thereby realizing the coordinated control of each component of the slitting machine and ensuring the automation and continuity of the slitting operation.

[0024] In summary, this utility model has the following beneficial effects:

[0025] 1. The length encoder can transmit slitting length data to the PLC in real time via A and B phase pulse signals, providing a basis for the precise cutting of the slitting machine; the status feedback switches of each device can accurately transmit the motor's readiness and fault status to the PLC, ensuring that the PLC can keep abreast of the equipment's operating status; and the unified DC power supply ensures the stability and accuracy of the sensor and status switch signal acquisition. Attached Figure Description

[0026] Figure 1 This is the circuit diagram of this utility model;

[0027] Figure 2 This is the electrical schematic diagram of this utility model. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] Identical parts are indicated by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to the attached figures. Figure 1 In this specification, the terms "bottom surface" and "top surface," "inner" and "outer" refer to the direction toward or away from the geometry of a specific component. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this specification, "a plurality of" means two or more, unless otherwise explicitly and specifically defined by the direction of the center.

[0030] Example 1:

[0031] like Figures 1-2As shown, a fully automatic slitting machine control circuit includes an AC power input module, a DC power input module, a PLC control module, an auxiliary control circuit module, a main circuit module, and an external device module; the AC power input module includes three-phase power interfaces R1S, S1S, and T1. The PLC has a neutral wire interface (S), a protective grounding interface (PE1), and a main fuse. The main fuse supplies power to both the auxiliary control circuit module and the main circuit module. The DC power input module includes a 24V interface, a 0V interface, and a protective grounding interface (PE). The DC power supply provides DC power to the PLC control module and the external device module. The PLC control module has a power interface, an input interface, and an output interface. The power interface connects to the DC power supply, the input interface connects to the sensors or status switches of the external device, and the output interface connects to the relays of the external device. The auxiliary control circuit module includes three indicator lights and an auxiliary fuse. The indicator lights are connected in parallel between the AC power supply and the neutral wire. The main circuit module includes three motor drive branches. Each branch consists of a circuit breaker, a contactor, and a motor connected in series. The motor casing is connected to the protective ground. The external device module includes sensors, status switches, and relays, which are electrically connected to the PLC's input and output interfaces, respectively.

[0032] In the AC power input module, the three-phase power interfaces R1S, S1S, and T1S are connected to the external three-phase AC power grid, and the output terminals are connected to the input terminals of the main fuse. The main fuse is a three-phase fuse, and its output terminals are divided into two paths: one path is connected to the auxiliary control circuit module, and the other path is connected to the input terminals of each circuit breaker in the main circuit module through branch wires. The neutral wire interface N is directly introduced to form a 230V AC power supply circuit with the three-phase power interfaces. The protective grounding interface PE1 is connected to the metal casing of all AC equipment in the system and is finally connected to the grounding electrode.

[0033] The 24V interface of the DC power input module is connected to the positive power interface of the PLC control module, and the 0V interface is connected to the negative power interface of the PLC control module; the protective ground interface PE is connected to the grounding terminal of the PLC control module, and finally connected to the system grounding body; the 24V interface and the 0V interface are also connected to the positive and negative power terminals of all sensors and the power supply terminals of relay coils in the external device module, respectively, forming an independent DC power supply circuit.

[0034] The PLC control module uses a DC-powered programmable logic controller with a DC 24V input voltage. The input interface includes seven independent signal input terminals: I0.0, I0.1, I0.2, I0.3, I0.4, I0.5, and I0.6. I0.0 connects to the A-phase signal output of the length measuring encoder, I0.1 connects to the B-phase signal output of the length measuring encoder, I0.2 connects to the ready signal terminal for cutter shaft lifting, I0.3 connects to the fault signal terminal for cutter shaft lifting, I0.4 connects to the ready signal terminal of the pinch roll controller, I0.5 connects to the ready signal terminal of the winding aid controller, and I0.6 connects to the ready signal terminal of the winding machine controller. The signal loop of each input interface forms a closed loop with both the DC 24V and 0V interfaces. The output interface includes at least six independent signal output terminals: Q0.0, Q0.1, Q0.2, Q0.3, Q0.4, and Q0.5, with transistor outputs.

[0035] The auxiliary control circuit module has three indicator lights: a red indicator light, a yellow indicator light, and a green indicator light, all powered by 230V AC. The first terminal of the red indicator light is connected to the R1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The first terminal of the yellow indicator light is connected to the S1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The first terminal of the green indicator light is connected to the T1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The three indicator lights are connected in parallel to each other and are used to indicate the system power on / off, standby, and running status, respectively. The auxiliary fuse is a single-phase fuse, with the upper terminal connected to the neutral interface N and the lower terminal leading out the neutral line, which can cooperate with any phase line after the main fuse to provide overcurrent protection and power circuit for the auxiliary control components.

[0036] In each motor drive branch of the main circuit module, the circuit breaker is a three-pole circuit breaker with short-circuit and overload protection functions. The input terminal is connected to the R1S, S1S, and T1S phase lines after the main fuse in the AC power input module via wires, and the output terminal is connected to the main contact input terminal of the contactor via wires. The contactor is a three-phase AC contactor, and the main contact output terminal is connected to the three-phase terminals of the motor via wires. The control circuit of the contactor coil is connected in series with the corresponding relay main contacts in the external equipment module. The motor is a three-phase asynchronous motor, and the metal casing of the motor is connected to the protective ground via a protective grounding wire.

[0037] The external device module's sensors include a length measuring encoder, which is an incremental encoder with A-phase and B-phase pulse signal output terminals. The A-phase output terminal is connected to the PLC control module's input interface I 0.0, and the B-phase output terminal is connected to the PLC control module's input interface I 0.1. The encoder's positive power supply terminal is connected to a DC 24V interface, and the negative power supply terminal is connected to a DC 0V interface, forming a signal acquisition loop. The status switches include multiple device controller status feedback switches. The motor's ready status switch signal terminal is connected to the PLC control module's input interface I 0.2, and the motor's fault status switch signal terminal is connected to the PLC control module's input interface I 0.3. The power supply terminals of the status feedback switches are all connected to both the DC 24V interface and the 0V interface.

[0038] The external device module contains six relays: KM1, KM2, KM3, KM4, KM5, and KM6. All are 24V DC powered electromagnetic relays. One end of the coil of relay KM1 is connected to the output interface Q0.0 of the PLC control module via a wire; one end of the coil of relay KM2 is connected to the output interface Q0.1 of the PLC control module via a wire; one end of the coil of relay KM3 is connected to the output interface Q0.2 of the PLC control module via a wire; one end of the coil of relay KM4 is connected to the output interface Q0.3 of the PLC control module via a wire; and one end of the coil of relay KM5 is connected to the output interface Q0.6 of the PLC control module via a wire. One end of the coil is connected to the output interface Q0.4 of the PLC control module via a wire, and one end of the coil of relay KM6 is connected to the output interface Q0.5 of the PLC control module via a wire; the other end of all relay coils is connected to the DC 0V interface via a wire to form a control circuit; the main contacts of each relay are connected in series in the control coil circuit of the corresponding contactor in the main circuit module, wherein the main contacts of KM1, KM2, and KM3 control the on / off state of the coils of the contactors in the three motor drive branches respectively, and the main contacts of KM4, KM5, and KM6 control the on / off state of the reverse coils of the contactors in the three motor drive branches respectively.

[0039] Specific implementation process: Connect to external three-phase AC power grid and DC power supply: Current flows out from the R-phase line of the external three-phase AC power grid and is connected to the three-phase power interface R1S of the AC power input module. The S-phase line is connected to S1S, the T-phase line is connected to T1S, the neutral line is connected to interface N, and the protective grounding line is connected to PE1. The current flows from R1S, S1S, and T1S into the input terminal of the main fuse. After overcurrent protection by the main fuse, the current is divided into two paths from the output terminal. One path flows to the auxiliary control circuit module, and the other path flows through branch wires to the input terminals of the three circuit breakers corresponding to the three motor drive branches of the main circuit module. At the same time, the DC power supply module starts up, and current flows out from the 24V DC power supply interface. One path connects to the positive power supply interface of the PLC control module, and after passing through the internal circuit of the PLC, it flows out from the negative power supply interface and connects to the 0V DC power supply interface to form a closed loop, powering up the PLC and completing its initialization. The other path of current flows out from the 24V interface and connects to the positive power supply terminals of the length measuring encoder, the positive power supply terminals of each status feedback switch, and one end of the coils of the six relays (KM1-KM6) in the external device module. Then, it flows out from the negative power supply terminals of the length measuring encoder, the negative power supply terminals of the status feedback switches, and the other end of the relay coils, and connects to the 0V DC power supply interface, thus constructing a stable DC power supply loop for the external device module.

[0040] In the auxiliary control circuit module, the current flowing from the output of the main fuse to this module first flows out from the R1S phase line after the main fuse, connects to the first terminal of the red indicator light, flows out from the second terminal after passing through the red indicator light, and connects to the neutral wire interface N to form a closed loop. The red indicator light is lit to indicate that the system power is on. At this time, the yellow and green indicator lights are not conducting and are in the off state. The upper terminal of the auxiliary fuse is connected to the neutral wire interface N, and the lower terminal leads out the neutral wire, which is matched with any phase line after the main fuse to reserve an overcurrent protection circuit for subsequent auxiliary control components (such as contactor coils).

[0041] The signal acquisition phase then begins: the length encoder starts working under a 24V DC power supply. When the slitting machine is ready to run, the A-phase pulse signal generated by the encoder is transmitted to the input interface I of the PLC control module via the signal line. 0.0, current flows out from the DC 24V interface, passes through the internal circuit of I0.0, and then flows into the 0V interface to form a signal loop, enabling the PLC to receive the A-phase signal; simultaneously, the B-phase pulse signal generated by the encoder is transmitted to the PLC input interface I0.1 through the signal line. The PLC calculates the slitting length based on the phase difference between the A and B-phase pulse signals. If the cutter shaft lifting system is in a ready state, its ready state feedback switch is closed, and current flows out from the 24V interface, passes through this switch, and then connects to the PLC input interface I0.2, before flowing from I0.2 into the 0V interface to form a loop, allowing the PLC to receive the cutter shaft lifting ready signal. If the cutter shaft lifting system malfunctions, the fault state feedback switch is closed, and current flows out from the 24V interface, passes through the fault switch, and connects to the PLC input interface I0.3, before flowing into the 0V interface, allowing the PLC to receive the fault signal. Similarly, when the pinch roll controller is ready, its ready switch is closed, causing current to form a loop through the PLC input interface I0.4; when the winding aid controller is ready, current forms a loop through I0.5; and when the winding machine controller is ready, current forms a loop through I0.5. 0.6 Once the circuit is formed, the PLC receives all ready signals and no fault signal is received, then completes the logic operation and enters the runnable state.

[0042] When the operator issues a start command, the PLC outputs control signals based on the calculation results: First, it controls the yellow indicator light circuit to conduct, and the current flows out from the S1 phase line after the main fuse, connects to the first terminal of the yellow indicator light, flows through the inside of the indicator light and then into the N terminal to form a circuit. The yellow indicator light illuminates to indicate that the system has entered standby mode. If the tool shaft lifting motor needs to rotate forward, the PLC control output interface Q0.0 is turned on, and the current flows out from the 24V interface, connects to one end of the coil of relay KM1 after Q0.0, and then flows into the 0V interface from the other end of the KM1 coil to form a closed circuit. After the KM1 coil is energized, its main contacts close. At this time, in the main circuit, the current flows out from the output terminal of the main fuse, flows into the input terminal of the circuit breaker (such as QF1) of the corresponding tool shaft lifting branch, and then connects to the main contact input terminal of the contactor after flowing out from the circuit breaker output terminal. Because the KM1 main contacts are closed, the current flows into the three-phase terminals (U1, V1, W1) of the tool shaft lifting motor through the main contact output terminal of the contactor, driving the motor to rotate forward. The outer casing is connected to PE1 via a protective grounding wire, ultimately forming a leakage protection circuit. If the pinch roller motor needs to rotate forward, the PLC control output interface Q0.1 is turned on, and the main circuit current flows into the pinch roller motor through the corresponding circuit breaker and the main contact of KM2, driving the motor to run. The forward rotation of the winding aid motor is achieved by the PLC output interface Q0.2 controlling KM3. After the main contact of KM3 is closed, the winding aid motor is energized and runs. When the motor needs to rotate in reverse, such as when the cutter shaft lifting motor rotates in reverse, the PLC control output interface Q0.3 is turned on, and the current flows through the main contact of KM4 to the reverse coil of the contactor corresponding to the cutter shaft lifting motor. The reverse contact of the contactor is closed, and the main circuit current drives the motor to rotate in reverse. Similarly, the reverse rotation of the pinch roller motor is achieved by Q0.4 controlling KM5, and the reverse rotation of the winding aid motor is achieved by Q0.5 controlling KM6. Each motor operates in coordination according to the PLC instructions.

[0043] When all motors are running normally, the PLC controls the green indicator light circuit to conduct. Current flows out from the T1S phase line after the main fuse, connects to the first terminal of the green indicator light, flows through the inside of the indicator light and into the N terminal to form a circuit. The green indicator light is lit to indicate that the system is in operation. During operation, the length encoder continuously generates A and B phase pulse signals, which are transmitted to the PLC through I0.0 and I0.1 to transmit the slitting length data. The PLC adjusts the running speed and start / stop timing of each motor according to the preset slitting length to ensure slitting accuracy.

[0044] If a motor overload or short circuit fault occurs during operation, the three-pole circuit breaker of the corresponding motor drive branch will trigger a protective action, cutting off the current in that branch, stopping the motor. Simultaneously, the fault status feedback switch for that branch will close, and the current will flow through the corresponding input interface of the PLC (e.g., for a tool shaft lifting fault, through I0.3) to form a signal loop. Upon receiving the fault signal, the PLC will immediately cut off the conduction state of all output interfaces (Q0.0-Q0.5), de-energize all relay coils, open the main contacts, stop all motors, and extinguish the yellow and green indicator lights, leaving only the red indicator light on to indicate the fault. If the stripping operation is completed and the operator issues a stop command, the PLC will sequentially cut off the outputs of Q0.0-Q0.5, de-energizing each relay coil, opening the main contacts, gradually stopping the motors, extinguishing the green indicator light, and relighting the yellow indicator light, returning the system to standby mode. If an overcurrent fault occurs in the auxiliary control circuit, the auxiliary fuse will blow, cutting off the neutral wire of the auxiliary control circuit to prevent damage to auxiliary components and ensure the safety of the entire circuit system.

[0045] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0046] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

Claims

1. A main control circuit for a fully automatic slitting machine, characterized in that, The system includes an AC power input module, a DC power input module, a PLC control module, an auxiliary control circuit module, a main circuit module, and an external device module. The AC power input module includes three-phase power interfaces R1S, S1S, and T1S, a neutral interface N, a protective grounding interface PE1, and a main fuse. The main fuse supplies power to both the auxiliary control circuit module and the main circuit module. The DC power input module includes a 24V interface, a 0V interface, and a protective grounding interface PE. The DC power supply provides DC power to the PLC control module and the external device module. The PLC control module has a power interface, an input interface, and an output interface. The power interface connects to the DC power supply, the input interface connects to sensors or status switches of external devices, and the output interface connects to relays of external devices. The auxiliary control circuit module includes three indicator lights and an auxiliary fuse. The indicator lights are connected in parallel between the AC power supply and the neutral wire. The main circuit module includes three motor drive branches. Each branch consists of a circuit breaker, a contactor, and a motor connected in series. The motor casing is connected to a protective ground. The external device module includes sensors, status switches, and relays, which are electrically connected to the PLC's input and output interfaces, respectively.

2. The main control circuit for a fully automatic slitting machine according to claim 1, characterized in that: In the AC power input module, the three-phase power interfaces R1S, S1S, and T1S are connected to the external three-phase AC power grid, and the output is connected to the input of the main fuse. The main fuse is a three-phase fuse, and its output is divided into two paths: one path is connected to the auxiliary control circuit module, and the other path is connected to the input of each circuit breaker in the main circuit module through branch wires. The neutral wire interface N is directly introduced to form a 230V AC power supply circuit with the three-phase power interfaces. The protective grounding interface PE1 is connected to the metal casing of all AC equipment in the system and finally connected to the grounding electrode.

3. The main control circuit for a fully automatic slitting machine according to claim 1, characterized in that: The 24V interface of the DC power input module is connected to the positive power interface of the PLC control module, and the 0V interface is connected to the negative power interface of the PLC control module; the protective ground interface PE is connected to the grounding terminal of the PLC control module, and finally connected to the system grounding body; the 24V interface and the 0V interface are also connected to the positive and negative power terminals of all sensors and the power supply terminals of relay coils in the external device module, respectively, forming an independent DC power supply circuit.

4. The main control circuit for a fully automatic slitting machine according to claim 1, characterized in that: The PLC control module is a DC-powered programmable logic controller with a DC 24V input voltage. The input interface includes seven independent signal input terminals: I0.0, I0.1, I0.2, I0.3, I0.4, I0.5, and I0.

6. I0.0 connects to the A-phase signal output of the length measuring encoder, I0.1 connects to the B-phase signal output of the length measuring encoder, I0.2 connects to the ready signal terminal for cutter shaft lifting, I0.3 connects to the fault signal terminal for cutter shaft lifting, I0.4 connects to the ready signal terminal of the pinch roll controller, I0.5 connects to the ready signal terminal of the winding aid controller, and I0.6 connects to the ready signal terminal of the winding machine controller. The signal loop of each input interface forms a closed loop with both the DC 24V and 0V interfaces. The output interface includes at least six independent signal output terminals: Q0.0, Q0.1, Q0.2, Q0.3, Q0.4, and Q0.5, with transistor outputs.

5. The main control circuit for a fully automatic slitting machine according to claim 1, characterized in that: The auxiliary control circuit module has three indicator lights: a red indicator light, a yellow indicator light, and a green indicator light, all powered by 230V AC. The first terminal of the red indicator light is connected to the R1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The first terminal of the yellow indicator light is connected to the S1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The first terminal of the green indicator light is connected to the T1S phase line after the main fuse, and the second terminal is connected to the neutral interface N. The three indicator lights are connected in parallel to each other and are used to indicate the system power on / off, standby, and running status, respectively. The auxiliary fuse is a single-phase fuse, with the upper terminal connected to the neutral interface N and the lower terminal leading out the neutral line, which cooperates with any phase line after the main fuse to provide overcurrent protection and power circuit for the auxiliary control element.

6. The main control circuit for a fully automatic slitting machine according to claim 1, characterized in that: In each motor drive branch of the main circuit module, the circuit breaker is a three-pole circuit breaker with short-circuit protection and overload protection functions. The input terminal is connected to the R1S, S1S, and T1S phase lines of the AC power input module after the main fuse via wires, and the output terminal is connected to the main contact input terminal of the contactor via wires. The contactor is a three-phase AC contactor, and the main contact output terminal is connected to the three-phase terminals of the motor via wires. The control circuit of the contactor coil is connected in series with the corresponding relay main contacts in the external equipment module. The motor is a three-phase asynchronous motor, and the metal casing of the motor is connected to the protective ground via a protective grounding wire.

7. The main control circuit for a fully automatic slitting machine according to claim 1, characterized in that: The external device module's sensors include a length measuring encoder, which is an incremental encoder with A-phase and B-phase pulse signal output terminals. The A-phase output terminal is connected to the input interface I0.0 of the PLC control module, and the B-phase output terminal is connected to the input interface I0.1 of the PLC control module. The encoder's positive power supply terminal is connected to a DC 24V interface, and the negative power supply terminal is connected to a DC 0V interface, forming a signal acquisition loop. The status switches include multiple device controller status feedback switches. The motor's ready status switch signal terminal is connected to the input interface I0.2 of the PLC control module, and the motor's fault status switch signal terminal is connected to the input interface I0.3 of the PLC control module. The power supply terminals of all the status feedback switches are connected to both the DC 24V interface and the 0V interface.

8. The main control circuit of a fully automatic slitting machine according to claim 1, characterized in that: The external device module includes six relays: KM1, KM2, KM3, KM4, KM5, and KM6, all of which are 24V DC powered electromagnetic relays. One end of the coil of relay KM1 is connected to the output interface Q0.0 of the PLC control module via a wire; one end of the coil of relay KM2 is connected to the output interface Q0.1 of the PLC control module via a wire; one end of the coil of relay KM3 is connected to the output interface Q0.2 of the PLC control module via a wire; one end of the coil of relay KM4 is connected to the output interface Q0.3 of the PLC control module via a wire; and one end of the coil of relay KM5 is connected to the output interface Q0.6 of the PLC control module via a wire. One end of the coil of relay KM1 is connected to the output interface Q0.4 of the PLC control module via a wire, and one end of the coil of relay KM6 is connected to the output interface Q0.5 of the PLC control module via a wire. The other end of all relay coils is connected to the DC 0V interface via a wire to form a control circuit. The main contacts of each relay are connected in series in the control coil circuit of the corresponding contactor in the main circuit module. The main contacts of KM1, KM2, and KM3 control the on / off state of the coils of the contactors in the three motor drive branches, respectively. The main contacts of KM4, KM5, and KM6 control the on / off state of the reverse coils of the contactors in the three motor drive branches, respectively.

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