A circuit monitoring method for numerical control machine tools

Abstract

The present invention relates to a method for monitoring a CNC machine tool circuit, which comprises the following steps: S1, a client is provided with a virtual CNC machine tool circuit, and the action function realized by the virtual circuit is the same as the action of a real machine tool circuit; S2, the client uses a high-level programming language to read the state signals such as the input and output of the CNC machine tool ladder diagram PLC through the industrial Ethernet, and uses the state signals to control the action of the client's virtual CNC circuit, so as to realize the display of the action of the real CNC machine tool circuit on the virtual CNC circuit on the client's computer screen. The present invention can realize network resource sharing and online monitoring of CNC machine tool circuits, which greatly improves the digital network service level of CNC machine tools.

Description

Technical Field

[0001] The invention belongs to the field of numerically controlled machine tools, and in particular relates to a circuit monitoring method for numerically controlled machine tools. Background Art

[0002] CNC technology and machine tools are the technology and equipment support for a country to engage in high-end manufacturing. Many cutting-edge industries in China need CNC technology as the basic technology, and CNC machine tools as the basic equipment for producing precision parts. CNC technology is an important technical driving force to promote a country's manufacturing level and manufacturing equipment to a new level. The application of CNC technology can ensure that my country's production can achieve large-scale, multi-variety, and high-precision models, and promote my country's manufacturing industry to transform from traditional manufacturing to information-based, digital, integrated, flexible, and networked production models. As time goes by, science and technology will continue to develop and progress rapidly. Under this fundamental trend, CNC machine tools should adhere to the path of sustainable development. Relevant staff can send instructions to CNC machine tools to instruct them to perform corresponding actions, so that CNC machine tools, such intelligent machines, can have higher efficiency. The application of such CNC machine tools in actual production and processing can further replace manual labor and perform actual production operations. For enterprises, if they want to steadily improve production efficiency, they need to arrange specialized technical personnel to study the above technologies in depth, so that they can respond to market changes and make timely and flexible adjustments according to their needs. In this way, they can achieve the effect of improving the production efficiency of CNC machine tools, and help enterprises improve their core competitiveness, occupy a favorable position in the increasingly fierce market competition, and obtain greater economic benefits. It can be seen that monitoring CNC machine tools and timely and efficiently eliminating machine tool failures can improve the machining efficiency of CNC machine tools, which is of great importance to my country's industrial production enterprises. Summary of the invention

[0003] In order to solve the problems existing in the prior art, the present invention provides a CNC machine tool circuit monitoring method, which can realize circuit monitoring of CNC machine tools, enable maintenance personnel to quickly and accurately determine machine tool faults and provide possible methods to eliminate the faults, thereby improving production efficiency.

[0004] To achieve the above purpose, the technical solution adopted by the present invention is:

[0005] S1. The client is equipped with a virtual CNC machine tool circuit, and the action function realized by the virtual circuit is the same as that of the real machine tool circuit;

[0006] S2. The client uses a high-level programming language to read the input, output and other status signals of the CNC machine ladder diagram PLC through industrial Ethernet, and uses the status signals to control the action of the client's virtual circuit, so as to display the action of the real machine tool circuit in the virtual circuit on the client's computer screen.

[0007] Furthermore, in the step S1, the client virtual CNC machine tool circuit is to draw the CNC machine tool related circuit on the client, draw two types of line segments at the relevant switches, draw a line segment of one color at the disconnected position, and draw a line segment of another color at the closed position. Draw a line segment at the disconnected and closed positions of the intermediate relay, and draw three line segments of the same color at the disconnected and closed positions of the AC contactor main contact. The method of drawing other circuits is the same.

[0008] Further, the virtual circuit action of step S1 is that when the CNC machine tool circuit switch is closed, the two closed position line segments are displayed and the open position line segments are not displayed; when the CNC machine tool circuit switch is open, the two closed position line segments are not displayed and the open position line segments are displayed; when the relevant intermediate relay and AC contactor are in action, a valid color such as red is displayed, otherwise another invalid color such as gray is displayed; when the motor is running, a color such as red is displayed, otherwise another color such as gray is displayed. The display method of other circuit actions is the same.

[0009] Furthermore, in step S2, the client uses a high-level programming language to read the CNC machine tool ladder diagram PLC input, output and other status signals through industrial Ethernet, which are the ladder diagram PLC program in the CNC system for the sequential control signals of X, Y, G, F and R during the operation of the CNC machine tool.

[0010] Furthermore, the step S2 uses the state signal to control the action of the client virtual circuit, which is based on the read PLC signal. When the signal is valid, the line segment of the client CNC machine tool circuit switch closed position is displayed, and the intermediate relay and AC contactor are displayed in red and valid; when the signal is invalid, the line segment of the client CNC machine tool circuit disconnected position is displayed, and the intermediate relay and AC contactor are displayed in gray and invalid. The display method of other circuit actions is the same.

[0011] Furthermore, the X, Y, G and F signals in the operation of the CNC machine tool are defined as follows: the X signal is a signal output from the machine tool periphery to the PLC, which is mainly an input signal of the keys, buttons and other switches of the machine tool operation panel; the Y signal is a signal output from the PLC to the machine tool, which is mainly a control signal of the machine tool actuator, as well as a status and alarm indication; the G signal is a signal output from the PLC to the CNC, which is mainly a control signal that causes the CNC to change or execute a certain operation; the F signal is a signal output from the CNC to the PLC, which is mainly a signal reflecting the CNC operation status or operation result. The R signal is a PLC operation intermediate signal.

[0012] Furthermore, the client computer is connected to the network interface of the CNC machine tool via a network cable.

[0013] The present invention adopts the above technical solution. The client uses a high-level programming language to read the input and output status signals of the CNC machine ladder diagram PLC through the industrial Ethernet, and uses the status signal to control the action of the client virtual CNC circuit, so as to realize the display of the action of the real CNC machine circuit on the client computer screen. It can realize the circuit monitoring of CNC machine tools, and the maintenance personnel can quickly and accurately judge the machine tool faults and provide possible methods to eliminate the faults, thereby improving the production efficiency of CNC enterprises. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a CNC circuit that is not monitored by the client;

[0015] Figure 2 It is the CNC machine circuit that the client is monitoring.

[0016] In the figure: 1. Red line in the switch disconnected position; 2. Green line in the switch closed position; 3. AC contactor;

[0017] 4. Intermediate relay; 5. PLC output Y signal; 6. Motor; 7. Tool holder motor and tool position number. DETAILED DESCRIPTION

[0018] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, rather than the entire contents.

[0019] 1. If Figure 1 As shown in the figure, take the electrical schematic diagram of FANUC 0i Mate TD CNC lathe as an example, edit the circuit schematic diagram of the window interface in the client Microsoft Visual C#.net environment. Draw two types of line segments at the relevant switches, and draw a color line segment at the disconnection position, such as Figure 1 Draw a red line segment in the middle, and draw another color line segment at the closed position, such as Figure 1 For the 2 green line segments, if it is a relay, draw a single line segment, and if it is an AC contactor, draw three line segments; when the intermediate relay and AC contactor are in action, their block diagrams display a valid color, such as red, otherwise they display another invalid color, such as gray. The drawing methods for other circuit parts are the same.

[0020] 2. If Figure 2, take the chip removal three-phase asynchronous motor as an example to illustrate the circuit monitoring method. In the inch (manual) mode, press the chip removal key, and through the PLC operation control, the Y2.2 output is valid, and the extended I / O unit output drives the relay KA3. The normally open contact of KA3 closes and then drives the coil of the AC contactor KM3 to make it work. The main contact of KM3 is closed. When QF3 is closed, the chip removal motor is connected to the three-phase AC power supply and rotates. On the client side, use the programming high-level language through Ethernet to read the CNC machine tool ladder diagram PLC output status signal Y2.2 is valid, the relay KA3 action box displays red, the KA3 normally open contact is closed and programmed to display the normally closed line segment, and the normally open line segment is not displayed. The KM3 coil is valid and displays red, and the KM3 main contact is closed and programmed to display the normally closed line segment, and the normally open line segment is not displayed. Read the CNC machine tool ladder diagram PLC input signal X3.5. If it is valid, it means that the air switch QF3 is closed and not overloaded or short-circuited. At this time, the chip removal motor is working and it is displayed red.

[0021] During the chip removal process, when the chip removal motor circuit is short-circuited, overloaded or under-voltage occurs, the circuit breaker QF3 is disconnected, and its auxiliary normally closed contact is closed. The input address X3.5=1 is valid. At this time, the green line segment X3.5 of the CNC lathe electrical monitoring screen is displayed, and the red line segment is not displayed. At the same time, the main contact of QF3 is also disconnected, the motor stops rotating, and the chip removal motor working monitoring makes it display gray.

[0022] 3. If Figure 2 , use high-level programming language on the client to read the CNC machine tool ladder diagram PLC input status signals X3.0, X3.1, X3.2, and X3.3 through Ethernet. These four signals represent the four tool position sensor input signals of the CNC lathe, such as Figure 1 As shown in 7, the current tool position can be determined based on these four signals, such as Figure 2 The number 1 knife is shown. Figure 1 As shown in Figure 7, the tool numbers 2, 3, and 4 are not displayed, but the tool number 1 is displayed. The monitoring method for other CNC machine tool circuit parts is the same.

[0023] The present invention is not limited to the above-mentioned optimal implementation mode. Anyone can derive other various forms of products under the inspiration of the present invention. However, no matter what changes are made in the shape or structure, all technical solutions that are the same or similar to those of the present application fall within the protection scope of the present invention.

Claims

1. A method for monitoring a circuit of a numerically controlled machine tool, characterized in that: S1. The client is provided with a virtual CNC machine tool circuit, and the action function realized by the virtual CNC machine tool circuit is the same as the action function of the real CNC machine tool circuit; S2. The client uses a high-level programming language to read the CNC machine tool ladder diagram PLC input and output status signals through industrial Ethernet, and uses the status signals to control the action of the client's virtual CNC machine tool circuit, so as to realize the display of the action of the real CNC machine tool circuit on the virtual CNC machine tool circuit on the client's computer screen; The client virtual CNC machine tool circuit is a CNC machine tool circuit drawn on the client, and two types of line segments are drawn at the relevant switches, one color line segment is drawn at the open position, and another color line segment is drawn at the closed position; Draw a line segment at the opening and closing points of the intermediate relay, and draw three line segments of the same color at the opening and closing points of the main contacts of the AC contactor; The virtual CNC machine tool circuit action is that when the CNC machine tool circuit switch is closed, the closed position line segment is displayed and the open position line segment is not displayed; when the CNC machine tool circuit switch is open, the closed position line segment is not displayed and the open position line segment is displayed; when the relevant intermediate relay and AC contactor are in action, a valid color, red, is displayed, otherwise another invalid color, gray, is displayed; when the motor is running, a color, red, is displayed, otherwise another color, gray, is displayed; The client uses a high-level programming language to read the input and output status signals of the ladder diagram PLC of the numerical control machine tool through the industrial Ethernet, which are the X, Y, G, F and R signals operated in the ladder diagram PLC of the numerical control system to realize sequential logic control; The action of the client virtual CNC machine tool circuit is controlled by the status signal, which is based on the read PLC status signal. When the signal is valid, the line segment of the closed position of the switch is displayed through programming control, and the line segment of the open position is not displayed. The intermediate relay and the AC contactor are displayed in red and valid; when the signal is invalid, the line segment of the open position of the switch is displayed, and the line segment of the closed position is not displayed. The intermediate relay and the AC contactor are displayed in gray and invalid; It displays red when the motor is running and gray otherwise.

2. The CNC machine tool circuit monitoring method according to claim 1, characterized in that: The X, Y, G and F signals in the operation of the CNC machine tool are defined as follows: The X signal is a signal output from the machine tool periphery to the PLC, mainly an input signal of keys, buttons and other switches on the machine tool operation panel; The Y signal is the signal output by the PLC to the machine tool, which is mainly the control signal of the machine tool actuator, as well as the status and alarm indication; The G signal is a signal output by the PLC to the CNC, which is mainly a control signal for the CNC to change or execute a certain operation; The F signal is a signal output by CNC to PLC, which mainly reflects the operation status or operation result of CNC; The R signal is a PLC operation intermediate signal.

3. The CNC machine tool circuit monitoring method according to claim 1, characterized in that: The client computer is connected to the network interface of the CNC machine tool via a network cable.

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