CN201556072U

CN201556072U - Programmable controller

Info

Publication number: CN201556072U
Application number: CN2009201873211U
Authority: CN
Inventors: 曹泽林
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-09-02
Filing date: 2009-09-02
Publication date: 2010-08-18
Anticipated expiration: 2019-09-02

Abstract

The utility model relates to a programmable controller, which comprises a main chip. An output end of a temperature sampling circuit is connected with an input end of the main chip, an output end of the main chip is connected with a peripheral electrothermal contactor and a peripheral electromagnetic valve through a relay K, and further, and the main chip sends a driving signal via a driving circuit to drive the relay K to act. The programmable controller detects temperature of each heating component through the temperature sampling circuit and outputs electric signals to the main chip, and the main chip drives the relay K to act so as to lead the relay K to be disconnected or connected with the peripheral electrothermal contactor and the peripheral electromagnetic valve, thereby automatically controlling temperature of each heating component.

Description

Programmable Logic Controller

Technical field

The utility model relates to a kind of Programmable Logic Controller.

Background technology

Injection machine is a kind of plastic processing machinery, its principle of work is that raw materials for plastics production (plastics rice etc.) are put into hopper, electrical heating is molten into liquid to starting material through barrel, and heating part is realized that by Electrothermal ring the heating-up temperature of barrel is generally between 180 ℃～250 ℃, plastic liquid after the heating is through hydraulic mechanism timing, quantitative injected plastic mould, plastic liquid is after in-mold molding, and regularly depanning is through supercooling, taking-up, through after the shaping, become semi-manufacture.

Plastic liquid has certain temperature in process of production, because the starting material difference of various plastics, various raw-material temperature are also different, and the temperature difference is less, and the workman is uncontrollable, so the automatic control section of temperature---heating collar must be installed, reometer also must be installed to show working current and trouble spot, electric elements are many, circuit complexity, failure rate height.Produced on the home market at present, most of control system adopt traditional relay control mode, and import PLC, touch-screen control method, and temperature controller still exists, and can't show electric current, voltage.Managerial personnel must arrive the on-the-spot ruuning situation that could check each machine, can't check the ruuning situations such as time, temperature, speed, fault of each machine in office.In addition, the bound equally reometer of the industrial control unit (ICU) of domestic institute import, voltage table, temperature controller, the electrical equipment original paper is more, complex circuit, failure rate height.

The utility model content

The purpose of this utility model is to provide a kind of can realize that temperature is controlled automatically, the Programmable Logic Controller of stable and reliable working performance.

For achieving the above object, the utility model has adopted following technical scheme: Programmable Logic Controller, comprise master chip, the output terminal of temperature sampling circuit links to each other with the input end of master chip, the output terminal of master chip links to each other with peripheral electric heating contactor, peripheral solenoid valve by relay K, and master chip sends the action of drive relay K through driving circuit.

As shown from the above technical solution, the utility model detects the temperature of each heater block by temperature sampling circuit, and the output electric signal is to master chip, drive the relay K action by master chip, relay K and peripheral electric heating contactor, peripheral solenoid valve are disconnected or is connected, realization is to each heater block temperature auto control.

Description of drawings

Fig. 1 is a frame principle figure of the present utility model;

Fig. 2,3,4 is respectively the circuit diagram of temperature in the utility model, electric current and voltage sample circuit;

Fig. 5 is the circuit diagram of switch sampling buffer circuit in the utility model;

Fig. 6 is the circuit diagram of photoelectric isolation module and electric current output processing circuit in the utility model;

Fig. 7 is the synoptic diagram of master chip in the utility model.

Embodiment

A kind of Programmable Logic Controller, comprise master chip 10, the output terminal of temperature sampling circuit 20 links to each other with the input end of master chip 10, the output terminal of master chip 10 is by relay K and peripheral electric heating contactor 160, peripheral solenoid valve 180 links to each other, master chip 10 sends the action of drive relay K through driving circuit 70, be provided with the A/D translation interface in being provided with in the master chip 10, A/O translation interface and timer, wherein, A/D is the analog quantity input interface, A/O is a switch value input interface, as Fig. 1, shown in 7, master chip 10 adopts programmable chip PLC24HJ128GP210.

In conjunction with Fig. 1,3,4, the output terminal of electric current and voltage sample circuit 30 links to each other with the input end of master chip 10, and electric current and voltage sample circuit 30 comprises current transformer SC1 and voltage transformer (VT) SA1, and the two links to each other with each heater block 110 respectively.Current transformer SC1 and voltage transformer (VT) SA1 output secondary current, voltage signal are to master chip 10, carry out overload protection by 10 pairs of relay K of master chip, in the protection value of setting, master chip 10 drives the relay K closure, each heater block 110 energising, heating; Heating reaches or when exceeding the protection value, master chip 10 drives relay K and disconnects, and stops 110 power supplies of each heater block, and sends alerting signal and show.

In conjunction with Fig. 1,2,3,4,6, described electric current and voltage sample circuit 30, the output terminal of temperature sampling circuit 20 links to each other with the input end of amplifier module 40 respectively, the output terminal of amplifier module 40 links to each other with the input end of master chip 10, the output terminal of master chip 10 links to each other with the input end of photoelectric isolation module 50, photoelectric isolation module 50 can suppress system noise effectively, eliminate the interference of ground loop, the output terminal of photoelectric isolation module 50 respectively with electric current output processing circuit 60, the input end of driving circuit 70 links to each other, driving circuit 70 drives peripheral electric heating contactor 160 and peripheral solenoid valve 180 by relay K, peripheral solenoid valve 180 is meant die sinking, fall plumbous, put lead, the solenoid valve of peripheral pneumatic element such as opening, the output terminal of electric current output processing circuit 60 links to each other with frequency converter 150, frequency converter 150 links to each other with motor, electric current output processing circuit 60 output FM signal are controlled the rotating speed of motor to frequency converter 150 by the output frequency of control of conversion device 150.

In conjunction with Fig. 2, described temperature sampling circuit 20 adopts thermopair RTTX01, thermopair is one of industrial the most frequently used detector unit, its measuring accuracy height, measurement range is wide, and thermopair commonly used all can accurately be measured from-50 ℃～+ 1600 ℃, in the utility model, adopt K type thermopair, its temperature measurement range is 0 ℃～800 ℃, can reach required heating-up temperature.

In conjunction with Fig. 1, described master chip 10 connects computer 130 and touch-screen 140 respectively by communication module and interface circuit, and master chip 10 and computer 130, touch-screen 140 are exchanged information.Computer 130 communication has telemonitoring, and the function of centralized management is convenient in shop office the ruuning situation of inspection machine at any time; Touch-screen 140 communications can show and set the running status and the various technical data of complete machine in process of production, also be provided with timer in the touch-screen 140, in the occasion that does not need to connect class's work, set next by timer, also can set the timing of heating in advance at this order of classes or grades at school, treat next, each heater block 110 reached produce temperature required, workman's production of can starting shooting immediately.When peripheral electrical equipment or circuit break down, touch-screen 140 can show the guilty culprit position and report to the police that master chip 10 sends the guarded command of interlock circuit outage.

In conjunction with Fig. 5, the peripheral switch 120 of input termination of switch sampling buffer circuit 80, peripheral switch 120 comprises various outside connected switches and the button in the circuitry, the input end of the output termination master chip 10 of switch sampling buffer circuit 80, the output terminal of master chip 10 links to each other with the stationary contact of relay K by photoelectric isolation module 50, driving circuit 70, and the moving contact of relay K links to each other with the solenoid valve of peripheral pneumatic element.Peripheral switch 120 is exported the switching value signals to master chip 10 through switch sampling buffer circuit 80, master chip 10 is by driving the relay K action to photoelectric isolation module 50, driving circuit 70, the solenoid valve of controlling peripheral pneumatic element in a certain order, the time continuous working, finish the complete machine task of work automatically.Peripheral pneumatic element is meant die sinking, it is plumbous to fall, put lead and opening pneumatic element.

In conjunction with Fig. 1, power module 90 external 220V AC power 100 are divided two-way output after inner transformation, rectification, one tunnel output 5V direct current is to master chip 10, another road output 24V direct current is to relay K and as touch-screen power supply 170, and the contact voltage of relay K is 24V to 240V.

In sum; core of the present utility model is to be provided with temperature sampling circuit 20 and electric current and voltage sample circuit 30 in Programmable Logic Controller; realize the function of temperature auto control and overload protection; and by external computer 130 and touch-screen 140; communicate by letter with extraneous in real time, realize the concentrated control automatically and the management of industry.In addition; the control of the utility model collection temperature, current/voltage demonstration, overload protection, timing are one; replaced original complete machine electric-control system; peripheral electric elements such as reometer, voltage table, electric cabinet have been reduced; when simplifying circuit, reduce failure rate, save cost and maintenance cost; increase the unit benefit, and be convenient to safeguard.

Claims

1. Programmable Logic Controller, comprise master chip (10), it is characterized in that: the output terminal of temperature sampling circuit (20) links to each other with the input end of master chip (10), the output terminal of master chip (10) links to each other with peripheral electric heating contactor, peripheral solenoid valve by relay K, and master chip (10) sends the action of drive relay K through driving circuit (70).

2. Programmable Logic Controller according to claim 1, it is characterized in that: the output terminal of electric current and voltage sample circuit (30) links to each other with the input end of master chip (10), electric current and voltage sample circuit (30) comprises current transformer and voltage transformer (VT), and the two links to each other with each heater block respectively.

3. Programmable Logic Controller according to claim 1, it is characterized in that: described electric current and voltage sample circuit (30), the output terminal of temperature sampling circuit (20) links to each other with the input end of amplifier module (40) respectively, the output terminal of amplifier module (40) links to each other with the input end of master chip (10), the output terminal of master chip (10) links to each other with the input end of photoelectric isolation module (50), the output terminal of photoelectric isolation module (50) respectively with electric current output processing circuit (60), the input end of driving circuit (70) links to each other, driving circuit (70) drives peripheral electric heating contactor and peripheral solenoid valve by relay K, and the output terminal of electric current output processing circuit (60) links to each other with frequency converter.

4. Programmable Logic Controller according to claim 1 is characterized in that: described temperature sampling circuit (20) adopts thermopair.

5. Programmable Logic Controller according to claim 1 is characterized in that: described master chip (10) connects computer and touch-screen respectively by communication module and interface circuit.

6. Programmable Logic Controller according to claim 1 is characterized in that: the peripheral switch of the input termination of switch sampling buffer circuit (80), the input end of the output termination master chip (10) of switch sampling buffer circuit (80).

7. Programmable Logic Controller according to claim 1 is characterized in that: described master chip is provided with A/D translation interface, A/O translation interface and timer in (10).

8. Programmable Logic Controller according to claim 1 is characterized in that: power module (90) divides two-way output, and one the tunnel exports master chip (10) to, and another road exports relay K and touch-screen to.