Die-casting machine axial force monitoring system and control method thereof

Abstract

The invention relates to the technical field of die-casting machine control, in particular to a die-casting machine axial force monitoring system and a control method thereof.The system comprises an axial force measuring module and a die-casting machine control module, a digital-to-analog conversion module is connected between the axial force measuring module and the die-casting machine control module, and a TCP / IP custom communication protocol is arranged between the digital-to-analog conversion module and the axial force measuring module. The method comprises the steps that the digital-to-analog conversion module sends a ready state code to the die-casting machine control module after judging that the axial force measurement module is ready, and sends a measurement instruction to the axial force measurement module when the die-casting machine is started for die assembly; the axial force measurement module starts measurement after receiving the measurement instruction and sends a measurement result to the die casting machine control module; and the die-casting machine control module reads the ready state code and reads and displays a measurement result when die closing of the die-casting machine is started until die opening of the die-casting machine is started, and the digital-to-analog conversion module and the axial force measurement module stop. According to the system and method, the data transmission speed between the modules is effectively increased, and the high efficiency and stability of the axial force measurement process are guaranteed.

Description

Technical Field

[0001] The embodiments of the present specification relate to the field of die-casting machine control technology, and in particular to a die-casting machine axial force monitoring system and a control method thereof. Background Art

[0002] The axial force monitoring of the die-casting machine mainly involves the real-time monitoring of the mechanical properties of the key components of the die-casting machine, such as the shaft and the coring column, under stress, in order to ensure the safety of the equipment and optimize the production parameters. Specifically, the axial force measurement module of the die-casting machine is required to measure the guide rod axial force and other data of the die-casting machine, and transmit the data to the die-casting machine controller for monitoring and analysis. At the same time, the die-casting machine controller also needs to send control instructions or configuration parameters and other data to the axial force measurement module to control the working state of the axial force measurement module. The existing data transmission interface between the axial force measurement module of the die-casting machine and the die-casting machine controller is single, the communication protocol structure is simple, and the conversion between different types of data is inconvenient, which makes the data transmission speed between the axial force measurement module and the die-casting machine controller slow, which cannot meet the data transmission requirements in the monitoring process, and the real-time monitoring of the mechanical performance status of the key components of the die-casting machine is poor. Summary of the invention

[0003] The embodiments of the present specification provide a die-casting machine axial force monitoring system and a control method thereof, aiming to solve one or more of the above-mentioned problems and other potential problems.

[0004] In order to achieve the above objectives, the following technical solutions are provided: According to the first aspect of the present specification, a die-casting machine axial force monitoring system is provided, the system comprising an axial force measurement module and a die-casting machine control module, the axial force measurement module sends die-casting machine guide rod axial force data to the die-casting machine control module, the die-casting machine control module sends control instructions and configuration parameters to the axial force measurement module, a digital-to-analog conversion module is connected between the axial force measurement module and the die-casting machine control module, and the communication protocol between the digital-to-analog conversion module and the axial force measurement module is a TCP / IP custom protocol.

[0005] In the embodiment of this specification, a digital-to-analog conversion module is added to the die-casting machine axial force monitoring system to meet the transmission of various types of data, making the system functions more diversified, and the digital-to-analog conversion process is more efficient, thereby ensuring the data transmission speed requirements of the axial force measurement system module and the die-casting machine control module. At the same time, the existing single-connection network communication protocol is changed, and the data transmission rate is further increased through the TCP / IP custom protocol.

[0006] In some embodiments, the digital-to-analog conversion module includes a power supply circuit, an MCU, and a digital-to-analog conversion circuit, an analog-to-digital conversion circuit, a digital input circuit, a digital output circuit, and a network interface circuit respectively connected to the MCU. The network interface circuit is used to send and receive network data of the axial force measurement module, and the digital-to-analog conversion circuit, the analog-to-digital conversion circuit, the digital input circuit, and the digital output circuit are used to transmit signals between the MCU and the die-casting machine control module.

[0007] In some embodiments, the digital-to-analog conversion circuit includes a digital-to-analog conversion chip and an operational amplifier, the input end of the digital-to-analog conversion chip is connected to the MCU, a resistor is connected in series between the output end of the digital-to-analog conversion chip and the input end of the operational amplifier, and the output end of the operational amplifier is connected to the die-casting machine control module.

[0008] In some embodiments, the network interface circuit is an Ethernet interface transceiver.

[0009] In some embodiments, the Ethernet interface transceiver includes an Ethernet physical layer chip and an interface chip, the Ethernet physical layer chip is connected to the MCU, the positive signal transmitting electrode, the negative signal transmitting electrode, the positive signal receiving electrode and the negative signal receiving electrode of the Ethernet physical layer chip are respectively connected to the interface chip, and protection diodes are provided between the positive signal transmitting electrode and the negative signal transmitting electrode, and between the positive signal receiving electrode and the negative signal receiving electrode.

[0010] In some embodiments, the Ethernet interface transceiver is connected to a network connection status indicator light and a connection speed indicator light.

[0011] In some embodiments, the digital input circuit and the digital output circuit both include optocoupler relays.

[0012] In some embodiments, the digital output circuit and the input and output ports of the digital output circuit are integrated on a port connector.

[0013] In some embodiments, the port connector is a relay output port.

[0014] According to a second aspect of the present specification, a control method for an axial force monitoring system of a die-casting machine is provided. The method is implemented based on the above system and includes: After the digital-to-analog conversion module determines that the axial force measurement module is ready, it sends a ready status code to the die-casting machine control module, and sends a measurement instruction to the axial force measurement module when it is determined that the die-casting machine is started; The axial force measurement module starts measuring after receiving the measurement instruction, and sends the measurement result to the die-casting machine control module through the digital-to-analog conversion module; The die-casting machine control module reads the ready status code and reads and displays the measurement result when determining that the die-casting machine is started by mold closing, and sends a stop command to the digital-to-analog conversion module and the axial force measurement module after determining that the die-casting machine is started by mold opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features and advantages of the embodiments of the present specification will become readily understood. In the accompanying drawings, several embodiments of the present specification are shown by way of example and not limitation.

[0016] Figure 1 A framework diagram of an axial force monitoring system for a die-casting machine according to an embodiment of the present specification is shown; Figure 2 Shows Figure 1 The framework diagram of the digital-to-analog conversion module in FIG. Figure 3 A circuit diagram of a digital-to-analog conversion circuit according to an embodiment of the present specification is shown; Figure 4 A circuit diagram of a digital input circuit according to an embodiment of the present specification is shown; Figure 5 A circuit diagram of a digital output circuit according to an embodiment of the present specification is shown; Figure 6 A schematic diagram of a port connector according to an embodiment of the present specification is shown; Figure 7 A circuit diagram of a network interface circuit according to an embodiment of the present specification is shown.

[0017] 1-Digital-to-analog conversion chip, 2-operational amplifier, 3-Ethernet physical layer chip, 4-interface chip.

[0018] In the various drawings, the same or corresponding reference numerals represent the same or corresponding parts. DETAILED DESCRIPTION

[0019] The preferred embodiments of the present specification will be described in more detail below with reference to the accompanying drawings. Although the preferred embodiments of the present specification are shown in the accompanying drawings, it should be understood that the present specification can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present specification more thorough and complete, and to fully convey the scope of the present specification to those skilled in the art.

[0020] The term "including" and its variations used in this document represent open inclusion, that is, "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "based at least in part on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one other embodiment". Terms such as "upper", "lower", "front", and "rear" indicating placement or positional relationships are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the principles of this specification, and do not indicate or imply that the referred elements must have a specific orientation, be constructed or operate in a specific orientation, and therefore should not be understood as limitations on this specification.

[0021] A die-casting machine axial force monitoring system and a control method for the die-casting machine axial force monitoring system according to an embodiment of the present specification are described in detail below in conjunction with the accompanying drawings. Figure 1 A framework diagram of a die-casting machine axial force monitoring system of an embodiment of the present specification is shown. The die-casting machine axial force monitoring system of the embodiment of the present specification includes an axial force measurement module and a die-casting machine control module, the axial force measurement module sends die-casting machine guide rod axial force data to the die-casting machine control module, the die-casting machine control module sends control instructions and configuration parameters to the axial force measurement module, a digital-to-analog conversion module is connected between the axial force measurement module and the die-casting machine control module, and the communication protocol between the digital-to-analog conversion module and the axial force measurement module is a TCP / IP custom protocol.

[0022] In this specification, a digital-to-analog conversion module is added to the axial force measurement system module and the die-casting machine control module, and the transmission process of the original single interface is changed to a signal transmission process common to digital data and analog data, which meets the transmission of various types of data, makes the system function more diversified, and the digital-to-analog conversion process is more efficient, thereby ensuring the data transmission speed requirements of the axial force measurement system module and the die-casting machine control module. At the same time, the existing single-connection Modbus / TCP network protocol is changed, and a custom protocol of the TCP / IP communication protocol is adopted between the digital-to-analog conversion module and the axial force measurement module. The TCP / IP communication protocol supports a variety of application layer protocols, such as HTTP, DNS, SMTP, FTP, etc., which can meet the diverse network communication requirements, has strong scalability and reliability, and a faster data transmission rate, which can ensure efficient data transmission between the axial force measurement system module and the die-casting machine control module. Specifically, the custom protocol is a modbus-like protocol, and the data format is a message header + address code + function code + data + check code. The transmission mode is Ethernet, and the error handling mainly relies on the check code verification, and the error data is discarded.

[0023] like Figure 2As shown, the digital-to-analog conversion module includes a power supply circuit, an MCU, and a digital-to-analog conversion circuit, an analog-to-digital conversion circuit, a digital input circuit, a digital output circuit and a network interface circuit respectively connected to the MCU. The network interface circuit is used to send and receive network data of the axial force measurement module. The digital-to-analog conversion circuit, the analog-to-digital conversion circuit, the digital input circuit and the digital output circuit are used to transmit signals between the MCU and the die-casting machine control module. Among them, the MCU is the main control chip, which is responsible for controlling the operation of each functional module connected to it, and the network interface circuit sends and receives network data of the axial force measurement module; the digital-to-analog conversion module converts the digital signal sent by the axial force measurement system into an analog signal and outputs it to the die-casting machine control module, and its conversion cycle is short and the output is stable. The analog-to-digital conversion module collects the analog data sent by the die-casting machine control module as digital data, inputs it to the MCU, and then sends it to the axial force measurement module through the network interface circuit, and the accuracy of collecting digital quantities is high. The digital input module collects the digital input points of the die-casting machine control module, inputs them to the MCU, and then sends them to the axial force measurement module, specifically collecting the output state quantity of the die-casting machine control module. The digital output module is responsible for sending the system status code of the axial force monitoring system to the die-casting machine control module. Specifically, the MCU is provided with two analog inputs and four analog outputs, the digital input module and the digital output module occupy 8 IO interfaces of the MCU respectively, and the MCU also includes a spare interface to facilitate the functional expansion of subsequent signal transmission lines.

[0024] like Figure 3 As shown, the digital-to-analog conversion circuit includes a digital-to-analog conversion chip 1 and an operational amplifier 2. The input end of the digital-to-analog conversion chip 1 is connected to the MCU. A resistor is connected in series between the output end of the digital-to-analog conversion chip 1 and the input end of the operational amplifier 2. The output end of the operational amplifier 2 is connected to the die-casting machine control module. The digital-to-analog conversion chip 1 is responsible for converting digital signals into analog signals, amplifying and adjusting the output of the digital-to-analog conversion chip 1. The 10K resistor connected in series between the digital-to-analog conversion chip 1 and the operational amplifier 2 can effectively increase the output change rate of the circuit voltage, thereby increasing the data transmission speed of the circuit; at the same time, the capacitance value of the capacitor with one end grounded next to the resistor is 22nF, which is higher than the circuit default configuration of 10nF, further improving the anti-interference ability of the circuit.

[0025] The digital input circuit and the digital output circuit are both optocoupler relays. The optocoupler relay can isolate the circuit when the digital signal is input and output, and the signal is transmitted in one direction, with fast data transmission response and high transmission efficiency while ensuring the stability of the circuit. Specifically, Figure 4As shown, the level signal output by the die-casting machine control module acts on the input end of the optocoupler relay of the digital input circuit, so that the light-emitting diode inside it lights up or goes out according to the level state, thereby causing the photosensitive semiconductor device inside the optocoupler relay to turn on or off, and the corresponding internal level is generated in the internal circuit of the optocoupler relay and transmitted to the MCU. The digital output circuit is similar, such as Figure 5 As shown, the level signal output by the MCU acts on the output end of the optocoupler relay of the digital output circuit, so that the light-emitting diode inside it is turned on or off, causing the photosensitive semiconductor device inside the optocoupler relay to be turned on or off, and the corresponding internal level is generated in the external circuit of the optocoupler relay and transmitted to the die-casting machine control module.

[0026] In addition, the digital output circuit and the input and output ports of the digital output circuit are integrated on the port connector, such as Figure 6 As shown, the port connector has a large number of ports, which meets the port number requirement of the system and makes wiring and line expansion more convenient. The port connector adopts a relay output port, which has a wider load adaptability and stronger load carrying capacity than the existing transistor output port.

[0027] The network interface circuit is an Ethernet interface transceiver. The Ethernet interface transceiver supports high-speed data transmission and is adapted to the above-mentioned custom protocol communication protocol. Specifically, Figure 7 As shown, the Ethernet interface transceiver includes an Ethernet physical layer chip 3 and an interface chip 4, the Ethernet physical layer chip 3 is connected to the MCU, the signal positive electrode, signal negative electrode, signal positive electrode and signal negative electrode of the Ethernet physical layer chip 3 are respectively connected to the interface chip 4, and protection diodes are provided between the signal positive electrode and the signal negative electrode, and between the signal positive electrode and the signal negative electrode. Among them, the Ethernet physical layer chip is responsible for realizing the transmission of Ethernet data on the physical layer, and can also realize the conversion between analog signals and digital signals. The rate of the Ethernet interface transceiver is not less than 100Mbps, the analog conversion time t<=1ms, and the analog output form is voltage, ranging from 0-10V. The interface chip 4 is responsible for data transmission and adaptation of specific communication protocols. The Ethernet interface transceiver is connected with a network connection status indicator and a connection speed indicator, which are used to show the network connection status and transmission speed of the network interface circuit to the staff, so as to find and solve problems in time. For example: Under normal circumstances, when the network connection status indicator light is solid green, it indicates that the network connection is normal; when it is solid red or no light, it indicates that the network connection is unsuccessful or the connection device has a fault; when the connection speed indicator light is green, it indicates a faster network connection speed; when it is red or orange, it indicates a slower network connection speed.

[0028] This specification also discloses a control method for an axial force monitoring system of a die-casting machine. The method is implemented based on the above-mentioned axial force monitoring system, and the method includes: S1, after the digital-to-analog conversion module determines that the axial force measurement module is ready, it sends a ready status code to the die-casting machine control module, and sends a measurement instruction to the axial force measurement module when it is determined that the die-casting machine is started; S3, the axial force measurement module starts measuring after receiving the measurement instruction, and sends the measurement result to the die-casting machine control module through the digital-to-analog conversion module; S5. The die-casting machine control module reads the ready status code and reads and displays the measurement result when determining that the die-casting machine is started by mold closing, and sends a stop command to the digital-to-analog conversion module and the axial force measurement module after determining that the die-casting machine is started by mold opening.

[0029] In step S1, the digital-to-analog conversion module also determines whether the axial force measurement module is ready through the ready signal sent by the axial force measurement module. Before sending the ready signal, the axial force measurement module can also first determine whether the connection with the digital-to-analog conversion module is successful. If unsuccessful, it will repeat the connection until the connection is successful and then send the ready signal. Specifically, the axial force measurement module can determine whether the connection with the digital-to-analog conversion module is successful by checking whether the above-mentioned network interface circuit and IP address exist.

[0030] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of this specification. Certain features described in the context of separate embodiments may also be implemented in a single implementation in combination. Conversely, various features described in the context of a single implementation may also be implemented in multiple implementations individually or in any suitable sub-combination.

[0031] Although the subject matter has been described in language specific to structural features and / or methodological logical actions, it should be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or actions described above. On the contrary, the specific features and actions described above are merely example forms of implementing the claims.

[0032] The embodiments of the present specification have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A die-casting machine axial force monitoring system, comprising an axial force measurement module and a die-casting machine control module, wherein the axial force measurement module sends die-casting machine guide rod axial force data to the die-casting machine control module, and the die-casting machine control module sends control instructions and configuration parameters to the axial force measurement module, characterized in that: A digital-to-analog conversion module is connected between the axial force measurement module and the die-casting machine control module, and the communication protocol between the digital-to-analog conversion module and the axial force measurement module is a TCP / IP custom protocol.

2. The system according to claim 1, characterized in that The digital-to-analog conversion module includes a power supply circuit, an MCU, and a digital-to-analog conversion circuit, an analog-to-digital conversion circuit, a digital input circuit, a digital output circuit, and a network interface circuit respectively connected to the MCU. The network interface circuit is used to send and receive network data of the axial force measurement module, and the digital-to-analog conversion circuit, the analog-to-digital conversion circuit, the digital input circuit, and the digital output circuit are used to transmit signals between the MCU and the die-casting machine control module.

3. The system according to claim 2, characterized in that The digital-to-analog conversion circuit comprises a digital-to-analog conversion chip (1) and an operational amplifier (2); the input end of the digital-to-analog conversion chip (1) is connected to the MCU; a resistor is connected in series between the output end of the digital-to-analog conversion chip (1) and the input end of the operational amplifier (2); and the output end of the operational amplifier (2) is connected to the die-casting machine control module.

4. The system according to claim 2, characterized in that The network interface circuit is an Ethernet interface transceiver.

5. The system according to claim 4, characterized in that The Ethernet interface transceiver comprises an Ethernet physical layer chip (3) and an interface chip (4); the Ethernet physical layer chip (3) is connected to the MCU; a positive electrode for transmitting signals, a negative electrode for transmitting signals, a positive electrode for receiving signals, and a negative electrode for receiving signals of the Ethernet physical layer chip (3) are respectively connected to the interface chip (4); and protection diodes are provided between the positive electrode for transmitting signals and the negative electrode for transmitting signals, and between the positive electrode for receiving signals and the negative electrode for receiving signals.

6. The system according to claim 4, characterized in that The Ethernet interface transceiver is connected to a network connection status indicator light and a connection speed indicator light.

7. The system according to claim 2, characterized in that The digital input circuit and the digital output circuit both include photocoupler relays.

8. The system according to claim 7, characterized in that The digital output circuit and the input and output ports of the digital output circuit are integrated on a port connector.

9. The system according to claim 8, characterized in that The port connector adopts a relay type output port.

10. A control method for an axial force monitoring system of a die casting machine, the method being implemented based on the system of claim 1, characterized in that: Methods include: After the digital-to-analog conversion module determines that the axial force measurement module is ready, it sends a ready status code to the die-casting machine control module, and sends a measurement instruction to the axial force measurement module when it is determined that the die-casting machine is started; The axial force measurement module starts measuring after receiving the measurement instruction, and sends the measurement result to the die-casting machine control module through the digital-to-analog conversion module; The die-casting machine control module reads the ready status code and reads and displays the measurement result when determining that the die-casting machine is started by mold closing, and sends a stop command to the digital-to-analog conversion module and the axial force measurement module after determining that the die-casting machine is started by mold opening.

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