A plasma cutting straight strip multi-parallel control system and control method

Abstract

The present invention provides a plasma cutting straight strip multi-parallel control system and control method, belonging to the field of plasma cutting technology. The control system includes: a CNC host, a plasma cutting unit, a multi-parallel straight strip cutting system, and a plasma height adjustment controller; the multi-parallel straight strip cutting system is used to obtain the on / off status of at least one plasma cutter in the plasma cutting unit and send a control signal to the CNC host based on the on / off status; the CNC host is used to control the walking cutting state of the plasma cutting unit based on the control signal sent by the multi-parallel straight strip cutting system; and the plasma height adjustment controller is used to control the height of the cutting gun head of the plasma cutter in the plasma cutting unit based on the control signal sent by the CNC. By connecting the multi-parallel straight strip cutting system to multiple plasma cutters, multiple plasma cutters can be controlled to perform cutting movements synchronously, effectively improving cutting efficiency and reducing production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of plasma cutting, and in particular to a plasma cutting straight strip multi-parallel control system and a control method. Background Art

[0002] Plasma cutting is a metal cutting method that utilizes a compressed plasma arc. Its characteristics include high production efficiency, narrow kerfs, smooth cut surfaces, minimal thermal deformation, no preheating required, and no need for flammable gases. It is now widely used for cutting sheet metal. Plasma cutting machines are specialized for straight bar cutting. Currently, the market typically uses a single machine for steel cutting, resulting in extremely low efficiency. Traditional cutting methods can take over an hour to cut a single sheet, and any malfunctions are not promptly reported to the CNC host.

[0003] The above problems are in urgent need of resolution. Summary of the Invention

[0004] The present invention aims to overcome at least one of the above-mentioned shortcomings of the prior art. On the one hand, it provides a plasma cutting straight strip multi-parallel control system, the control system comprising: a CNC host, a plasma cutting unit, a multi-parallel straight strip cutting system and a plasma height adjustment controller, wherein the plasma cutting unit includes at least one plasma cutting machine; the multi-parallel straight strip cutting system is bidirectionally electrically connected to the plasma cutting unit, and is used to obtain the on / off status of at least one plasma cutting machine in the plasma cutting unit and send a control signal to the CNC host based on the on / off status; a first input end of the CNC host is connected to a first output end of the multi-parallel straight strip cutting system, and a first output end of the CNC host is electrically connected to an input end of the plasma cutting unit, and is used to control the walking and cutting state of the plasma cutting unit based on the control signal sent by the multi-parallel straight strip cutting system; an input end of the plasma height adjustment controller is electrically connected to a second output end of the CNC host, and an output end of the plasma height adjustment controller is bidirectionally electrically connected to the plasma cutting unit, and is used to control the height of the cutting gun head of the plasma cutting machine in the plasma cutting unit based on the control signal sent by the CNC.

[0005] Furthermore, the multi-parallel straight strip cutting system integrates an arc switching circuit, a current control circuit and a multi-parallel logic control circuit; the input end of the arc switching circuit is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting group, for obtaining the arc striking current of the at least one plasma cutting machine; the input end of the current control circuit is electrically connected to the output end of the arc switching circuit, and the output end of the current control circuit is electrically connected to the input end of the plasma cutting group, for controlling the current released by at least one plasma cutting machine in the plasma cutting group to reach a preset current based on the electrical signal sent by the arc switching circuit; the input end of the multi-parallel logic control circuit is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting group, and the output end of the multi-parallel logic control circuit is connected to the input end of the CNC host and the plasma height adjustment controller, for generating a control signal based on the feedback signal of at least one plasma cutting machine in the plasma cutting group and sending it to the CNC host and the plasma height adjustment controller respectively.

[0006] Furthermore, the multi-parallel logic control circuit is also used to: when the signals received from at least one plasma cutting machine are all high-level signals, generate a first control signal and send it to the CNC host and the plasma height adjustment controller respectively; when there is a low-level signal in the signals received from at least one plasma cutting machine, generate a second control signal and send it to the CNC host and the plasma height adjustment controller respectively.

[0007] Furthermore, the CNC host controls at least one plasma cutting machine in the plasma cutting group to be in a walking cutting state at the same time based on the first control signal; the plasma height adjustment controller receives the cutting gun voltage of at least one plasma cutting machine in the plasma cutting group based on the first control signal, and controls the height of the cutting gun based on the voltage; the CNC host controls at least one plasma cutting machine in the plasma cutting group to be in a non-walking cutting state at the same time based on the second control signal; and the plasma height adjustment controller is placed in a non-working state based on the second control signal.

[0008] Furthermore, the multi-parallel logic control circuit is used to generate control signals based on the on-off signal fed back by at least one plasma cutting machine in the plasma cutting group through AND or digital logic control, and send them to the CNC host and plasma height adjustment controller respectively.

[0009] Furthermore, the control system also includes a material table, and the third output terminal of the CNC host is electrically connected to the material table, which is used to control the workpiece to be processed on the material table based on the control signal sent by the multi-strip cutting system.

[0010] Furthermore, the arc switching circuit includes a first operational amplifier U1A, a second operational amplifier U1B, a first transistor Q1, a second relay KD2 and a second indicator LED2, the positive input end of the first operational amplifier U1A is connected to at least one plasma cutting machine through a first resistor R1, the reverse input end of the first operational amplifier U1A is connected between the output end of the first operational amplifier U1A and the second resistor R2, the first capacitor C1 is connected in parallel to the output end of the first operational amplifier UIA, and the output end of the first operational amplifier U1A is connected to the second resistor R2. The positive input terminal of the second operational amplifier U1B is connected to the negative input terminal of the second operational amplifier U1B, the negative input terminal of the second operational amplifier U1B is connected to the +15V voltage through the third resistor R3, the output terminal of the second operational amplifier U1B is connected to the base of the first transistor Q1 through the fifth resistor R5, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the second relay KD2, the second relay KD2 is connected to the +15V voltage via the seventh resistor R71, one end of the eighth resistor R8 is connected between the seventh resistor R71 and the +15V voltage, and the other end is connected to the second indicator LED2.

[0011] Furthermore, the current control circuit includes an optocoupler U2, a second transistor Q2, a first relay KD1 and a first indicator light LED1. The first pin of the optocoupler U2 is connected to a +15V voltage through a ninth resistor R9, the second pin is connected to the output end of the arc circuit, the fourth pin is connected to a +15V voltage, the third pin is connected to the base of the second transistor Q2 through a tenth resistor R10, the collector of the second transistor Q2 is connected to the first relay KD1, the emitter of the second transistor Q2 is grounded, the first relay KD1 is connected in parallel with the third diode D3, the first relay KD1 is connected to a +15V voltage via a twelfth resistor R121, one end of the thirteenth resistor is connected between the twelfth resistor R121 and the +15V voltage, and the other end is connected to the first indicator light LED1, and the other end of the first indicator light LED1 is grounded.

[0012] Furthermore, the multi-parallel logic control circuit includes N signal receiving circuits, N digital chips and a signal generating circuit, wherein the first signal receiving circuit and the second signal receiving circuit are connected to the input end of the first digital chip, and the output ends of the N digital chips are connected to the signal generating circuit; the signal receiving circuit includes an inverter, a third transistor Q3 and a third indicator light LED3, and the signal generating circuit includes a third relay J1, a fourth transistor Q4 and a non-inverting buffer.

[0013] In the second aspect, the present invention provides a plasma cutting straight bar multi-parallel control method, which is applied to the above-mentioned plasma cutting straight bar multi-parallel control system, and the method includes: obtaining the on and off status of at least one plasma cutting machine in the plasma cutting group through the multi-parallel straight bar cutting system, and sending a control signal to the CNC host based on the on and off status; the CNC host controls the walking and cutting state of the plasma cutting group based on the control signal sent by the multi-parallel straight bar cutting system; the plasma height adjustment controller controls the height of the cutting gun head of the plasma cutting machine in the plasma cutting group based on the control signal sent by the CNC.

[0014] The beneficial effects of the present invention are as follows: the present invention provides a plasma cutting straight strip multi-parallel control system, the control system comprising: a CNC host, a plasma cutting unit, a multi-parallel straight strip cutting system and a plasma height adjustment controller, the plasma cutting unit comprising at least one plasma cutting machine; the multi-parallel straight strip cutting system is bidirectionally electrically connected to the plasma cutting unit, for obtaining the on / off state of at least one plasma cutting machine in the plasma cutting unit, and sending a control signal to the CNC host based on the on / off state; a first input end of the CNC host is connected to a first output end of the multi-parallel straight strip cutting system, a first output end of the CNC host is electrically connected to an input end of the plasma cutting unit, for controlling the walking and cutting state of the plasma cutting unit based on the control signal sent by the multi-parallel straight strip cutting system; an input end of the plasma height adjustment controller is electrically connected to a second output end of the CNC host, an output end of the plasma height adjustment controller is bidirectionally electrically connected to the plasma cutting unit, for controlling the height of the cutting gun head of the plasma cutting machine in the plasma cutting unit based on the control signal sent by the CNC host. By connecting the multi-strip cutting system to multiple plasma cutting machines, multiple plasma cutting machines can be controlled to perform cutting movements synchronously, avoiding the problem of low cutting efficiency in the existing technology, effectively improving cutting efficiency and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and examples.

[0016] Figure 1 This is a schematic structural diagram of a plasma cutting straight strip multi-control system provided in Example 1 of the present invention.

[0017] Figure 2 This is a structural schematic diagram of a multi-strip cutting system provided in Example 1 of the present invention.

[0018] Figure 3 This is a topological diagram of an arc switching circuit provided in Example 1 of the present invention.

[0019] Figure 4 This is a topological diagram of a current control circuit provided in Example 1 of the present invention.

[0020] Figure 5 This is a topology diagram of a multi-parallel logic control circuit provided by Example 1 of the present invention.

[0021] Figure 6 This is a flow chart of a plasma cutting straight strip multi-control method provided in Example 2 of the present invention.

[0022] Figure 7 This is a partial block diagram of an electronic device provided by Example 4 of the present invention. DETAILED DESCRIPTION

[0023] Before discussing the exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the various operations as sequential processes, many of the operations therein can be implemented in parallel, concurrently, or simultaneously. In addition, the order of the various operations can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0024] It should be understood that although the terms "first," "second," and the like may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used solely to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of the exemplary embodiments. The term "and / or" as used herein includes any and all combinations of one or more of the listed associated items.

[0025] The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, which only illustrates the basic structure of the present invention in a schematic manner, and therefore only shows the components related to the present invention.

[0026] Example 1

[0027] like Figure 1 FIG. 1 is a schematic diagram of the structure of a plasma cutting straight strip multi-control system provided by the present invention.

[0028] As an example, the control system includes: a CNC host 1, a plasma cutting unit 2, a multi-strip cutting system 3 and a plasma height adjustment controller 4, wherein the plasma cutting unit 2 includes at least one plasma cutting machine; the multi-strip cutting system 3 is bidirectionally electrically connected to the plasma cutting unit 2, and is used to obtain the on / off status of at least one plasma cutting machine in the plasma cutting unit 2, and send a control signal to the CNC host 1 based on the on / off status; an input terminal of the CNC host is connected to a first output terminal of the multi-strip cutting system 3 The first output end of the CNC host 1 is electrically connected to the input end of the plasma cutting unit 2, and is used to control the walking and cutting state of the plasma cutting unit 2 based on the control signal sent by the multi-strip cutting system 3; the input end of the plasma height adjustment controller 4 is electrically connected to the second output end of the CNC host 1, and the output end of the plasma height adjustment controller 4 is bidirectionally electrically connected to the plasma cutting unit 2, and is used to control the height of the cutting gun head of the plasma cutting machine in the plasma cutting unit 2 based on the control signal sent by the CNC host 1.

[0029] Preferably, Figure 2 As shown, the multi-parallel straight strip cutting system 3 integrates an arc switching circuit 310, a current control circuit 320 and a multi-parallel logic control circuit 330; the input end of the arc switching circuit 310 is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting unit 2, for obtaining the arc striking current of the at least one plasma cutting machine; the input end of the current control circuit 320 is electrically connected to the output end of the arc switching circuit 310, and the output end of the current control circuit 320 is electrically connected to the input end of the plasma cutting unit 2, for controlling the arc striking current based on the arc switching circuit 3 10 sends an electrical signal to control the current released by at least one plasma cutting machine in the plasma cutting group 2 to reach a preset current; the input end of the multi-parallel logic control circuit 330 is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting group 2, and the output end of the multi-parallel logic control circuit 330 is connected to the input end of the CNC host 1 and the plasma height adjustment controller 4, and is used to generate a control signal based on the feedback signal of at least one plasma cutting machine in the plasma cutting group 2 and send it to the CNC host 1 and the plasma height adjustment controller 4 respectively.

[0030] Preferably, the multi-parallel logic control circuit 330 is further configured to: when the signals fed back by at least one plasma cutting machine are all high-level signals, generate a first control signal and send it to the CNC host and the plasma height controller respectively; when the signals fed back by at least one plasma cutting machine are low-level signals, generate a second control signal and send it to the CNC host 1 and the plasma height controller 4 respectively. The CNC host 1 controls at least one plasma cutting machine in the plasma cutting group 2 to be in a walking cutting state based on the first control signal; the plasma height controller 4 receives the cutting gun voltage of at least one plasma cutting machine in the plasma cutting group based on the first control signal and controls the height of the cutting gun based on the voltage; the CNC host 1 controls at least one plasma cutting machine in the plasma cutting group to be in a non-walking cutting state based on the second control signal; and the plasma height controller is placed in a non-operating state based on the second control signal. Specifically, the multi-parallel logic control circuit 330 uses digital logic control "AND" and "OR" to complete parallel system control. The basic logic is that if one group experiences an abnormality, the output signal is a fault signal. When the parallel devices are cutting normally and all logic signals are "1", the signal fed back to the CNC host 1 is "1". Based on the feedback signal, the CNC host 1 starts to control at least one plasma cutting machine in the plasma cutting group to move and cut. At the same time, it also controls the plasma height adjustment controller 4 to start working.

[0031] Preferably, the multi-parallel logic control circuit 330 is used to generate control signals based on the on / off signals fed back by at least one plasma cutting machine in the plasma cutting unit 2 through AND / OR digital logic control, and send them to the CNC host 1 and the plasma height adjustment controller 4 respectively. Specifically, the electrical signal fed back by the plasma cutting unit 2 to the multi-parallel logic control circuit 330 is an on / off signal. That is, only when all the plasma cutting machines in the plasma cutting unit 2 are in normal working condition will the multi-parallel logic control circuit 330 send a first control signal back to the CNC host 1, so that the CNC host 1 controls the plasma cutting machines in the plasma cutting unit 2 to be in the walking cutting state and the plasma height adjustment controller 4 to be in the working state. The adoption of this solution not only improves the working efficiency of plasma cutting, but also enables the effective feedback of fault information of the plasma cutting machine to the CNC host 1.

[0032] Preferably, the control system further includes a material table 5, and the third output terminal of the CNC host 1 is electrically connected to the material table 5, and is used to control the workpiece to be processed on the material table 5 based on the control signal sent by the multi-strip cutting system 3. That is, when the CNC host 1 receives the first control signal, it synchronously controls the material table 5.

[0033] Preferably, Figure 3As shown, the arc switching circuit 310 includes a first operational amplifier U1A, a second operational amplifier U1B, a first transistor Q1, a second relay KD2 and a second indicator LED2. The positive input terminal of the first operational amplifier U1A is connected to at least one plasma cutting machine through a first resistor R1. The negative input terminal of the first operational amplifier U1A is connected between the output terminal of the first operational amplifier U1A and the second resistor R2. The first capacitor C1 is connected in parallel to the output terminal of the first operational amplifier U1A. The output terminal of the first operational amplifier U1A is connected through the second resistor R2. The positive input terminal of the second operational amplifier U1B is connected to the negative input terminal of the second operational amplifier U1B, the negative input terminal of the second operational amplifier U1B is connected to the +15V voltage through the third resistor R3, the output terminal of the second operational amplifier U1B is connected to the base of the first transistor Q1 through the fifth resistor R5, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the second relay KD2, the second relay KD2 is connected to the +15V voltage via the seventh resistor R71, one end of the eighth resistor R8 is connected between the seventh resistor R71 and the +15V voltage, and the other end is connected to the second indicator LED2.

[0034] Preferably, Figure 4 As shown, the current control circuit includes an optocoupler U2, a second transistor Q2, a first relay KD1 and a first indicator light LED1. The first pin of the optocoupler U2 is connected to a +15V voltage through a ninth resistor R9, the second pin is connected to the output end of the arc circuit, the fourth pin is connected to a +15V voltage, the third pin is connected to the base of the second transistor Q2 through a tenth resistor R10, the collector of the second transistor Q2 is connected to the first relay KD1, the emitter of the second transistor Q2 is grounded, the first relay KD1 is connected in parallel with the third diode D3, the first relay KD1 is connected to a +15V voltage via a twelfth resistor R121, one end of the thirteenth resistor is connected between the twelfth resistor R121 and the +15V voltage, and the other end is connected to the first indicator light LED1, and the other end of the first indicator light LED1 is grounded.

[0035] Preferably, Figure 5 As shown, the multi-parallel logic control circuit includes N signal receiving circuits, N digital chips, and a signal generating circuit, wherein the first signal receiving circuit and the second signal receiving circuit are connected to the input end of the first digital chip, and the output ends of the N digital chips are connected to the signal generating circuit; the signal receiving circuit includes an inverter, a third transistor Q3, and a third indicator LED3, and the signal generating circuit includes a third relay J1, a fourth transistor Q4, and a non-inverting buffer. Specifically, Figure 4In the figure, the plasma cutting machine group 2 includes 10 plasma cutting machines as an example, that is, it includes 10 signal receiving circuits and 10 digital chips, and the digital chip model is CD4081. Among them, the 10 signal receiving circuits are connected in parallel, and every two digital receiving circuits are connected in parallel through a digital chip, and finally output to the signal generating circuit. The signal generating circuit determines whether the generated control signal is the first control signal or the second notification signal based on the AND / OR logical relationship.

[0036] In the above embodiment, by connecting multiple plasma cutting machines to the multi-parallel straight-strip cutting system, the multiple plasma cutting machines can be controlled to perform cutting movements synchronously, thus avoiding the low cutting efficiency problem existing in the prior art, effectively improving cutting efficiency and reducing production costs. Furthermore, fault signals of the plasma cutting machines can be effectively fed back to the CNC host.

[0037] Example 2

[0038] See also Figure 6 , this embodiment provides a flow chart of a plasma cutting straight strip multi-control method.

[0039] As an example, the method includes:

[0040] S610: Obtaining the on / off status of at least one plasma cutting machine in the plasma cutting machine group through the multi-strip cutting system, and sending a control signal to the CNC host based on the on / off status.

[0041] S620: The CNC host controls the walking and cutting state of the plasma cutting unit based on the control signal sent by the multi-strip cutting system.

[0042] S630: The plasma height adjustment controller controls the height of the cutting gun head of the plasma cutting machine in the plasma cutting machine group based on the control signal sent by the CNC host.

[0043] It is not difficult to find that this embodiment is a method example corresponding to the first embodiment, and this embodiment can be implemented in conjunction with the first embodiment. The relevant technical details mentioned in the first embodiment are still valid in this embodiment, and to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied to the first embodiment.

[0044] Example 3

[0045] An embodiment of the present invention further provides a storage medium storing a method for controlling multiple parallel strips in plasma cutting. When executed by a processor, the program for controlling multiple parallel strips in plasma cutting implements the steps of the method for controlling multiple parallel strips in plasma cutting as described above. Because this storage medium incorporates all the technical solutions of all the aforementioned embodiments, it possesses at least all the beneficial effects provided by the technical solutions of these embodiments, and therefore will not be further elaborated upon here.

[0046] Example 4

[0047] See also Figure 7 An embodiment of the present invention further provides an electronic device, comprising: a memory and a processor; the memory stores at least one program instruction; the processor implements the plasma cutting straight strip multi-control method provided in Example 2 by loading and executing the at least one program instruction.

[0048] The memory 602 and processor 601 are connected using a bus. The bus can include any number of interconnected buses and bridges, connecting various circuits of one or more processors 601 and memory 602. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits. These are all well known in the art and, therefore, are not described further herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be a single component or multiple components, such as multiple receivers and transmitters, providing a unit for communicating with various other devices over a transmission medium. Data processed by the processor 601 is transmitted over a wireless medium via an antenna. Furthermore, the antenna receives data and transmits it to the processor 601.

[0049] The processor 601 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interfaces, voltage regulation, power management, and other control functions. The memory 602 can be used to store data used by the processor 601 when performing operations.

[0050] The above is only an embodiment of the present invention. Common knowledge such as the known specific structures and characteristics in the scheme is not described in detail here. Ordinary technicians in the field are aware of all common technical knowledge in the technical field of the invention before the application date or priority date, can obtain all existing technologies in the field, and have the ability to apply conventional experimental means before that date. Ordinary technicians in the field can improve and implement this scheme in combination with their own abilities under the inspiration given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the field to implement this application. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A plasma cutting straight strip multi-control system, characterized in that: The control system includes: a CNC host, a plasma cutting unit, a multi-strip cutting system and a plasma height adjustment controller, and the plasma cutting unit includes at least one plasma cutting machine; The multi-strip cutting system is bidirectionally electrically connected to the plasma cutting unit, and is used to obtain the on / off status of at least one plasma cutting machine in the plasma cutting unit, and send a control signal to the CNC host based on the on / off status; The first input terminal of the CNC host is connected to the first output terminal of the multi-strip cutting system, and the first output terminal of the CNC host is electrically connected to the input terminal of the plasma cutting unit, and is used to control the walking and cutting state of the plasma cutting unit based on the control signal sent by the multi-strip cutting system; The input end of the plasma height adjustment controller is electrically connected to the second output end of the CNC host, and the output end of the plasma height adjustment controller is bidirectionally electrically connected to the plasma cutting unit, for controlling the height of the cutting gun head of the plasma cutting machine in the plasma cutting unit based on the control signal sent by the CNC host; The multi-parallel straight strip cutting system is integrated with an arc rotation circuit, a current control circuit and a multi-parallel logic control circuit; The input end of the arc switching circuit is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting machine group, and is used to obtain the arc striking current of the at least one plasma cutting machine; The input end of the current control circuit is electrically connected to the output end of the arc switching circuit, and the output end of the current control circuit is electrically connected to the input end of the plasma cutting unit, and is used to control the current released by at least one plasma cutting machine in the plasma cutting unit to reach a preset current based on the electrical signal sent by the arc switching circuit; The input end of the multi-parallel logic control circuit is respectively connected to the output end of at least one plasma cutting machine in the plasma cutting group, and the output end of the multi-parallel logic control circuit is connected to the input end of the CNC host and the plasma height adjustment controller, and is used to generate a control signal based on the feedback signal of at least one plasma cutting machine in the plasma cutting group and send it to the CNC host and the plasma height adjustment controller respectively; The multi-parallel logic control circuit is also used for: When the signals fed back by at least one plasma cutting machine are all high-level signals, a first control signal is generated and sent to the CNC host and the plasma height adjustment controller respectively; When there is a low-level signal in the feedback signal received from at least one plasma cutting machine, a second control signal is generated and sent to the CNC host and the plasma height adjustment controller respectively; The CNC host controls at least one plasma cutting machine in the plasma cutting machine group to be in a walking cutting state at the same time based on the first control signal; The plasma height adjustment controller receives a cutting gun voltage of at least one plasma cutting machine in the plasma cutting machine group based on the first control signal, and controls the height of the cutting gun based on the voltage; The CNC host controls at least one plasma cutting machine in the plasma cutting machine group to be in a non-moving cutting state at the same time based on the second control signal; The plasma height adjustment controller is placed in a non-operating state based on the second control signal.

2. The plasma cutting straight strip multi-control system according to claim 1, characterized in that: The multi-parallel logic control circuit is used to generate control signals based on the on-off signal fed back by at least one plasma cutting machine in the plasma cutting machine group through AND or digital logic control, and send them to the CNC host and the plasma height adjustment controller respectively.

3. The plasma cutting straight strip multi-control system according to claim 1, characterized in that: The control system also includes a material table, and the third output end of the CNC host is electrically connected to the material table, and is used to control the workpiece to be processed on the material table based on the control signal sent by the multi-strip cutting system.

4. The plasma cutting straight strip multi-control system according to claim 1, characterized in that: The arc switching circuit includes a first operational amplifier U1A, a second operational amplifier U1B, a first transistor Q1, a second relay KD2 and a second indicator LED2. The positive input end of the first operational amplifier U1A is connected to at least one plasma cutting machine through a first resistor R1. The reverse input end of the first operational amplifier U1A is connected between the output end of the first operational amplifier U1A and the second resistor R2. The first capacitor C1 is connected in parallel to the output end of the first operational amplifier U1A. The output end of the first operational amplifier U1A is connected to the second resistor R2. The positive input terminal of the second operational amplifier U1B and the reverse input terminal of the second operational amplifier U1B are connected to the +15V voltage through the third resistor R3, the output terminal of the second operational amplifier U1B is connected to the base of the first transistor Q1 through the fifth resistor R5, the emitter of the first transistor Q1 is grounded, the collector of the first transistor Q1 is connected to the second relay KD2, the second relay KD2 is connected to the +15V voltage via the seventh resistor R71, one end of the eighth resistor R8 is connected between the seventh resistor R71 and the +15V voltage, and the other end is connected to the second indicator LED2.

5. The plasma cutting straight strip multi-control system according to claim 1, characterized in that: The current control circuit includes an optocoupler U2, a second transistor Q2, a first relay KD1 and a first indicator light LED1. The first pin of the optocoupler U2 is connected to a +15V voltage through a ninth resistor R9, the second pin is connected to the output end of the arc circuit, the fourth pin is connected to a +15V voltage, the third pin is connected to the base of the second transistor Q2 through a tenth resistor R10, the collector of the second transistor Q2 is connected to the first relay KD1, the emitter of the second transistor Q2 is grounded, the first relay KD1 is connected in parallel with the third diode D3, the first relay KD1 is connected to a +15V voltage via a twelfth resistor R121, one end of a thirteenth resistor is connected between the twelfth resistor R121 and the +15V voltage, and the other end is connected to the first indicator light LED1, and the other end of the first indicator light LED1 is grounded.

6. The plasma cutting straight strip multi-control system according to claim 1, characterized in that: The multi-parallel logic control circuit includes N signal receiving circuits, N digital chips and a signal generating circuit, wherein the first signal receiving circuit and the second signal receiving circuit are connected to the input end of the first digital chip, and the output ends of the N digital chips are connected to the signal generating circuit; The signal receiving circuit includes an inverter, a third transistor Q3 and a third indicator LED3, and the signal generating circuit includes a third relay J1, a fourth transistor Q4 and a non-inverting buffer.

7. A plasma cutting straight strip multi-control method, characterized in that: The method adopts the plasma cutting straight strip multi-parallel control system according to any one of claims 1 to 6, and the method comprises: Acquiring the on / off status of at least one plasma cutting machine in the plasma cutting machine group through a multi-strip cutting system, and sending a control signal to a CNC host based on the on / off status; The CNC host controls the walking and cutting state of the plasma cutting unit based on the control signal sent by the multi-strip cutting system; The plasma height adjustment controller controls the height of the cutting gun head of the plasma cutting machine in the plasma cutting machine group based on the control signal sent by the CNC host.

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