Cold isostatic pressing equipment control system based on PLC (Programmable Logic Controller)

Abstract

The utility model relates to the technical field of cold isostatic pressing equipment, in particular to a cold isostatic pressing equipment control system based on a programmable logic controller (PLC), which comprises the PLC. The PLC controller comprises a PID control module, an analog quantity module and a digital quantity module. A digital quantity module is arranged, and a control signal is generated according to an input switching value signal to drive a control valve set to operate cold isostatic pressing equipment connection; a PID (Proportion Integration Differentiation) control module is arranged to generate a comparison signal according to a set pressure signal and a pressure signal acquired from a pressure sensor; an analog quantity module is arranged and used for outputting a comparison signal to a booster station main pump set, the opening and closing degree of a proportional valve of the booster station main pump set is adjusted, and pressure increasing and releasing operation of an auxiliary machine and a main machine of cold isostatic pressing equipment execution equipment is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of cold isostatic pressing equipment, in particular to a cold isostatic pressing equipment control system based on a PLC controller. Background Art

[0002] The isostatic press is a molding equipment that works under ultra-high pressure. The isostatic press uses oil, water or gas as the working medium and applies the same ultra-high pressure in all directions to all surfaces of the object, which can make the molded workpiece have high and uniform density, uniform sintering shrinkage and easy machining.

[0003] With the continuous enhancement of my country's industrial strength and the continuous advancement of technology, domestic manufacturers have achieved breakthroughs in the above-mentioned components and have begun to gradually apply them. Although domestic controller technology has developed to a certain extent, the overall function is relatively simple. Utility Model Content

[0004] In view of the above-mentioned defects, the utility model proposes a cold isostatic pressing equipment control system based on a PLC controller; comprising a PLC controller; the PLC controller comprises a PID control module, an analog quantity module, and a digital quantity module; by setting the digital quantity module, a control signal is generated according to an input switching quantity signal to drive a control valve group to operate the cold isostatic pressing equipment connection; by setting the PID control module, a comparison signal is generated according to a set pressure signal and a pressure signal collected from the pressure sensor; by setting the analog quantity module, a comparison signal is output to the main pump of the boosting station, the opening and closing size of the proportional valve of the main pump of the boosting station is adjusted, and the pressure increase and unloading operations of the auxiliary equipment and the main machine of the cold isostatic pressing equipment are completed.

[0005] The specific implementation contents of the utility model are as follows:

[0006] A cold isostatic pressing equipment control system based on a PLC controller, connected to the cold isostatic pressing equipment; the cold isostatic pressing equipment includes a pressure sensor, a control valve group, and a main pump group of a booster station; and includes a PLC controller;

[0007] The PLC controller includes a PID control module, an analog quantity module, and a digital quantity module;

[0008] The input end of the analog module is connected to the pressure sensor, and the output end of the analog module is connected to the booster main pump group;

[0009] The input end of the digital quantity module inputs a switch quantity signal, and the output end of the digital quantity module is connected to the control valve group;

[0010] The first input end of the PID control module inputs a set pressure signal, the second input end of the PID control module is connected to the analog module, and the output end of the PID control module is connected to the analog module;

[0011] The digital quantity module is used to generate a control signal to drive the control valve group to operate the cold isostatic pressing equipment according to the input switch quantity signal;

[0012] The PID control module is used to generate a comparison signal according to a set pressure signal and a pressure signal collected from the pressure sensor;

[0013] The analog module is used to output a comparison signal to the main pump of the boosting station to adjust the opening and closing size of the proportional valve of the main pump of the boosting station.

[0014] In order to better implement the present utility model, further, the digital quantity module includes a digital quantity input module and a digital quantity output module;

[0015] The input end of the digital quantity input module inputs a switch quantity signal, and the output end of the digital quantity input module is connected to the input end of the digital quantity module;

[0016] The output end of the digital output module is connected to the input end of the control valve group.

[0017] In order to better implement the utility model, further, the digital quantity input module includes a voltage divider, a bidirectional series diode circuit, and an isolation optocoupler;

[0018] The input end of the voltage divider inputs a switching signal, and the output end is connected to the input end of the bidirectional series diode circuit;

[0019] The input end of the isolation optocoupler is connected to the output end of the bidirectional series diode circuit, and the output end of the isolation optocoupler is connected to the input end of the digital quantity output module.

[0020] In order to better implement the utility model, further, the digital quantity output module includes an inverter and a transistor unit;

[0021] The input end of the inverter is connected to the output end of the isolation optocoupler, and the output end of the inverter is connected to the input end of the transistor;

[0022] The output end of the transistor unit is connected to the input end of the main control valve group.

[0023] In order to better implement the utility model, further, the analog quantity module includes an analog quantity input module and an analog quantity output module;

[0024] The input end of the analog input module is connected to the output end of the pressure sensor, and the output end of the analog input module is connected to the input end of the analog output module and the input end of the PID control module;

[0025] The input end of the analog output module is connected to the output end of the PID control module, and the output end of the analog output module is connected to the boost main pump group.

[0026] In order to better realize the utility model, further, the cold isostatic pressing equipment control system based on the PLC controller also includes a proportional amplifier;

[0027] The input end of the proportional amplifier is connected to the output end of the analog output module, and the output end of the proportional amplifier is connected to the input end of the boost main pump group.

[0028] In order to better realize the utility model, further, the cold isostatic pressing equipment control system based on the PLC controller also includes an HMI component and a monitoring module;

[0029] The HMI component is connected to the Ethernet interface of the PLC controller;

[0030] One end of the monitoring module is connected to the Ethernet interface of the PLC controller, and the other end is connected to the PC.

[0031] In order to better implement the utility model, further, the PLC controller also includes a Modbus-TCP module;

[0032] The Modbus-TCP module communicates with the HMI component and the monitoring module through the Modbus-TCP protocol.

[0033] The utility model has the following beneficial effects:

[0034] The utility model sets a PLC controller including a PID control module, an analog module and a digital module to drive the analog output module to output a pressure control signal; the digital output module outputs a control valve group and a control pump group control signal, so that the domestic controller can complete the pressure increase and relief operations of the auxiliary machine and the main machine of the cold isostatic pressing equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The present invention provides a schematic block diagram of the overall structure of a cold isostatic pressing equipment control system based on a PLC controller.

[0036] Figure 2 This is a structural schematic block diagram of the digital quantity input module provided by the present invention.

[0037] Figure 3This is a structural schematic block diagram of the digital quantity output module provided by the present invention. DETAILED DESCRIPTION

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. It should be understood that the described embodiments are only part of the embodiments of the utility model, not all of the embodiments, and therefore should not be regarded as limiting the scope of protection. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technical personnel in this field without creative work are within the scope of protection of the utility model.

[0039] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "disposed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] Embodiment 1:

[0041] This embodiment proposes a cold isostatic pressing equipment control system based on a PLC controller, such as Figure 1 As shown, it is connected to the cold isostatic pressing equipment; the cold isostatic pressing equipment includes a pressure sensor, a control valve group, and a main pump group of a booster station; the cold isostatic pressing equipment control system based on a PLC controller includes a PLC controller;

[0042] The PLC controller includes a PID control module, an analog quantity module, and a digital quantity module;

[0043] The input end of the analog module is connected to the pressure sensor, and the output end of the analog module is connected to the booster main pump group;

[0044] The input end of the digital quantity module inputs a switch quantity signal, and the output end of the digital quantity module is connected to the control valve group;

[0045] The first input end of the PID control module inputs a set pressure signal, the second input end of the PID control module is connected to the analog module, and the output end of the PID control module is connected to the analog module;

[0046] The digital quantity module is used to generate a control signal to drive the control valve group to operate the cold isostatic pressing equipment according to the input switch quantity signal;

[0047] The PID control module is used to generate a comparison signal according to a set pressure signal and a pressure signal collected from the pressure sensor;

[0048] The analog module is used to output a comparison signal to the main pump of the boosting station to adjust the opening and closing size of the proportional valve of the main pump of the boosting station.

[0049] Working principle: This embodiment sets a PLC controller and sets a PID control module in the PLC controller. By setting a digital quantity module, a control signal is generated according to the input switch quantity signal to drive the control valve group to operate the cold isostatic pressing equipment connection; by setting a PID control module, a comparison signal is generated according to the set pressure signal and the pressure signal collected from the pressure sensor; by setting an analog quantity module, it is used to output the comparison signal to the main pump of the boosting station, adjust the opening and closing size of the proportional valve of the main pump of the boosting station, and complete the cold isostatic pressing equipment to perform the equipment auxiliary and main machine pressure increase and unloading operations.

[0050] Embodiment 2:

[0051] This embodiment is based on the above embodiment 1. Figure 2 , Figure 3 As shown in the figure, the specific structure of the digital quantity module is explained.

[0052] The digital quantity module includes a digital quantity input module and a digital quantity output module;

[0053] The input end of the digital quantity input module inputs a switch quantity signal, and the output end of the digital quantity input module is connected to the input end of the digital quantity module;

[0054] The output end of the digital output module is connected to the input end of the control valve group.

[0055] The digital quantity input module includes a voltage divider, a bidirectional series diode circuit, and an isolation optocoupler;

[0056] The input end of the voltage divider inputs a switching signal, and the output end is connected to the input end of the bidirectional series diode circuit;

[0057] The input end of the isolation optocoupler is connected to the output end of the bidirectional series diode circuit, and the output end of the isolation optocoupler is connected to the input end of the digital quantity output module.

[0058] The digital quantity output module includes an inverter and a transistor unit;

[0059] The input end of the inverter is connected to the output end of the isolation optocoupler, and the output end of the inverter is connected to the input end of the transistor;

[0060] The output end of the transistor unit is connected to the input end of the main control valve group.

[0061] Working principle: The digital input module provided in this embodiment collects switch signals, and the collected switch signals include information such as travel switches, knobs, circuit breakers, etc., which are converted into control signals and output through the digital output module to control the operation of the auxiliary main machine of the cold isostatic pressing equipment.

[0062] This embodiment collects multi-channel switch quantity signals by setting a multi-channel digital quantity input module, and realizes input in two directions, namely source type and drain type, by setting a bidirectional series diode circuit. The optocoupler can be turned on. When the external input is a low level, the optocoupler is cut off and the output is high. After passing through the inverter, the input is low. When the external input is a high level, the optocoupler is turned on and the output is low. After passing through the inverter, the input is high, thereby realizing digital quantity input of the digital quantity input channel.

[0063] The other parts of this embodiment are the same as those of the above-mentioned embodiment 1, and thus will not be described in detail.

[0064] Embodiment 3:

[0065] This embodiment describes the structure of the analog quantity module based on any one of the above-mentioned embodiments 1 to 2.

[0066] The analog quantity module includes an analog quantity input module and an analog quantity output module;

[0067] The input end of the analog input module is connected to the output end of the pressure sensor, and the output end of the analog input module is connected to the input end of the analog output module and the input end of the PID control module;

[0068] The input end of the analog output module is connected to the output end of the PID control module, and the output end of the analog output module is connected to the boost main pump group.

[0069] Furthermore, the PLC controller-based cold isostatic pressing equipment control system further includes a proportional amplifier;

[0070] The input end of the proportional amplifier is connected to the output end of the analog output module, and the output end of the proportional amplifier is connected to the input end of the boost main pump group.

[0071] Working principle: In this embodiment, an analog input module is set to collect the pressure sensor signal of the cold isostatic pressing equipment, the current signal is converted into a pressure value, and the pressure value is output to the PID control module. The output value of the PID control module is controlled by adjusting the PID parameters to control the pressure of the cold isostatic pressing equipment to follow the real-time set pressure curve.

[0072] The other parts of this embodiment are the same as any of the above-mentioned embodiments 1-2, so they will not be repeated here.

[0073] Embodiment 4:

[0074] This embodiment is based on any one of the above embodiments 1 to 3. Figure 1 As shown, it also includes HMI components and monitoring modules;

[0075] The HMI component is connected to the Ethernet interface of the PLC controller;

[0076] One end of the monitoring module is connected to the Ethernet interface of the PLC controller, and the other end is connected to the PC.

[0077] In order to better implement the utility model, further, the PLC controller also includes a Modbus-TCP module;

[0078] The Modbus-TCP module communicates with the HMI component and the monitoring module through the Modbus-TCP protocol.

[0079] Working principle: This embodiment displays the control information and setting parameters on the HMI panel through the Modbus TCP protocol, and monitors the working status, pressure, alarm information, etc. of the cold isostatic pressing equipment in real time. If the pressure of the cold isostatic pressing equipment exceeds the set alarm value, the equipment alarms and automatically stops to relieve pressure to ensure the safety of equipment and personnel.

[0080] This embodiment uses the central control SCADA monitoring software, the monitoring system PC and the HMI panel to form a backup, and can monitor the pressure data in real time, and regularly archive alarm records, pressure curves, etc.

[0081] This embodiment uses the hardware and software of the domestic controller to complete the control function of the cold isostatic pressing equipment originally implemented by Siemens. It includes a central control PLC controller; analog input module AI5208-S; analog output module AO5208V-S; digital input module DI5216-S; digital output module DO5216-S; proportional output amplifier; HMI panel and monitoring system PC. The analog input module collects the 4-20mA analog signal of the equipment pressure sensor, converts it into a 0-20000 digital signal, and then converts it into a pressure signal; calculates the pressure value during the entire process of the boost curve, compares it with the collected pressure signal, and outputs the real-time changing bit value signal to the analog module through the PID control block to control the opening and closing size of the proportional valve of the main pump of the boost station, and then controls the PID fast response speed and overshoot adjustment range through the setting of the three control quantities of P, I, and D to match the set boost curve. The digital input module collects signals from circuit breakers, travel switches, level gauges, knob switches, etc., and outputs alarms, indicator lights, motor control and other signals by controlling the digital output module to complete equipment operation functions such as auxiliary machine travel, filling and pumping, medium liquid cooling circulation, pressure increase and unloading, etc. Use the domestic central control programming software GCS Contrix corresponding to the domestic controller instead of Siemens software TIA Portal, add hardware configuration and communication configuration, define program function blocks and data types, configure the main task and task configuration of the control program, use domestic software programming languages ​​LD and FBD instead of Siemens programming languages ​​STL and LAD, compile the control program, and complete the function realization of all control logic. Communication information flows in the network segment through the controller Ethernet interface using the ModbusTCP communication protocol, and displays the controller information on the HMI panel and the monitoring system PC.

[0082] The other parts of this embodiment are the same as any one of the above-mentioned embodiments 1 to 3, so they will not be repeated here.

[0083] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A cold isostatic pressing equipment control system based on a PLC controller, connected to a cold isostatic pressing equipment; the cold isostatic pressing equipment comprises a pressure sensor, a control valve group, and a main pump group of a booster station; characterized in that: Including PLC controller; The PLC controller includes a PID control module, an analog quantity module, and a digital quantity module; The input end of the analog module is connected to the pressure sensor, and the output end of the analog module is connected to the main pump group of the boosting station; The input end of the digital quantity module inputs a switch quantity signal, and the output end of the digital quantity module is connected to the control valve group; The first input end of the PID control module inputs a set pressure signal, the second input end of the PID control module is connected to the analog module, and the output end of the PID control module is connected to the analog module; The digital quantity module is used to generate a control signal to drive the control valve group to operate the cold isostatic pressing equipment according to the input switch quantity signal; The PID control module is used to generate a comparison signal according to a set pressure signal and a pressure signal collected from the pressure sensor; The analog module is used to output a comparison signal to the main pump group of the booster station to adjust the opening and closing size of the proportional valve of the main pump group of the booster station.

2. A PLC controller-based cold isostatic pressing equipment control system according to claim 1, characterized in that: The digital quantity module includes a digital quantity input module and a digital quantity output module; The input end of the digital quantity input module inputs a switch quantity signal, and the output end of the digital quantity input module is connected to the input end of the digital quantity module; The output end of the digital output module is connected to the input end of the control valve group.

3. A PLC controller-based cold isostatic pressing equipment control system according to claim 2, characterized in that: The digital quantity input module includes a voltage divider, a bidirectional series diode circuit, and an isolation optocoupler; The input end of the voltage divider inputs a switching signal, and the output end is connected to the input end of the bidirectional series diode circuit; The input end of the isolation optocoupler is connected to the output end of the bidirectional series diode circuit, and the output end of the isolation optocoupler is connected to the input end of the digital quantity output module.

4. A PLC controller-based cold isostatic pressing equipment control system according to claim 3, characterized in that: The digital quantity output module includes an inverter and a transistor unit; The input end of the inverter is connected to the output end of the isolation optocoupler, and the output end of the inverter is connected to the input end of the transistor; The output end of the transistor unit is connected to the input end of the control valve group.

5. A PLC controller-based cold isostatic pressing equipment control system according to claim 1, characterized in that: The analog quantity module includes an analog quantity input module and an analog quantity output module; The input end of the analog input module is connected to the output end of the pressure sensor, and the output end of the analog input module is connected to the input end of the analog output module and the input end of the PID control module; The input end of the analog output module is connected to the output end of the PID control module, and the output end of the analog output module is connected to the main pump group of the boosting station.

6. A PLC controller-based cold isostatic pressing equipment control system according to claim 5, characterized in that: The PLC controller-based cold isostatic pressing equipment control system further includes a proportional amplifier; The input end of the proportional amplifier is connected to the output end of the analog output module, and the output end of the proportional amplifier is connected to the input end of the main pump group of the boosting station.

7. The cold isostatic pressing equipment control system based on PLC controller according to claim 1, characterized in that: The PLC controller-based cold isostatic pressing equipment control system also includes an HMI component and a monitoring module; The HMI component is connected to the Ethernet interface of the PLC controller; One end of the monitoring module is connected to the Ethernet interface of the PLC controller, and the other end is connected to the PC.

8. A PLC controller-based cold isostatic pressing equipment control system according to claim 7, characterized in that: The PLC controller also includes a Modbus-TCP module; The Modbus-TCP module communicates with the HMI component and the monitoring module through the Modbus-TCP protocol.

Images