CN203054530U

CN203054530U - Capacitive touch screen explosion-proof control box

Info

Publication number: CN203054530U
Application number: CN 201220693316
Authority: CN
Inventors: 伍书良; 程律志
Original assignee: SICHUAN SFMC PETROLEUM EQUIPMENT CO Ltd
Current assignee: SICHUAN SFMC PETROLEUM EQUIPMENT CO Ltd
Priority date: 2012-12-16
Filing date: 2012-12-16
Publication date: 2013-07-10
Anticipated expiration: 2022-12-16

Abstract

The utility model discloses a capacitive touch screen explosion-proof control box. The capacitive touch screen explosion-proof control box is characterized by comprising an explosion-proof box, a touch screen positioned outside the explosion-proof box, a programmable controller PLC, a first motor controller and a second motor controller, wherein the programmable controller PLC, the first motor controller and the second motor controller are positioned inside the explosion-proof box; the touch screen is connected with an input end of the programmable controller PLC inside the explosion-proof box via a cable; a first output end of the programmable controller PLC is connected with the first motor controller; and a second output end of the programmable controller PLC is connected with the second motor controller. The capacitive touch screen explosion-proof control box has the advantages of being equipped with a human-machine dialogue interface, enabling the service life of a touch switch to be prolonged, helping to prevent impurities or steam from entering the explosion-proof box, being safer and more reliable, etc.

Description

The explosion-proof control box of a kind of capacitive touch screen

Technical field

The utility model discloses the explosion-proof control box of a kind of capacitive touch screen, belong to explosion-proof control box field.

Background technology

In field of oil drilling, often can use vibratory screening apparatus, double-deck screen shale shaker especially, and vibratory screening apparatus is by motor-driven.At the such environment in rig well site, there are multiple inflammable and explosive gas or liquid, the power control part of motor divides needs to use explosion-proof tank.The structure of explosion-proof tank and control just seem particularly important.

At present, the explosion-proof tank that uses of the same trade, what all adopt is mechanical type gauge tap case, though this mode structure is simple, maintenance is convenient, but exist as for a long time, frequently opening switch, can cause failure rate to increase, because mechanical operation, the metal clips fatigue of switch is followed the string and lost efficacy, airborne water vapor and gaseous impurities can enter into the metal clips of button by the slit of button and explosion-proof tank, and to its generation corrosive attack, in the past for a long time, can cause switch aging, loose contact, power supply short circuit appears in the serious next meeting of situation.Even influence the work of motor; More seriously: use at inflammable and explosive like this environment, mechanical switch is easy to generate spark, may cause dangerous security incident.

The utility model content

For solving the problems of the technologies described above, the utility model provides a kind of explosion-proof switch case that does not have metal clips, has the switch of prolongation effect in serviceable life, has to prevent that impurity or steam from entering the advantage of explosion-proof tank.And the utility model also has friendly man-machine dialog interface.

For realizing above-mentioned technical purpose, the technical solution of the utility model is as follows:

Capacitive touch screen is positioned at explosion-proof control box outside, uses stube cable to insert explosion-proof control box.Programmable Logic Controller PLC, first electric machine controller and second electric machine controller, touch-screen is connected with the input end of Programmable Logic Controller PLC and is positioned at explosion-proof tank, first output terminal of described Programmable Logic Controller PLC is connected with first electric machine controller, second output terminal of Programmable Logic Controller PLC be connected with second electric machine controller.

First electric machine controller described in the utility model is the first electronic ac switch KM1, described second electric machine controller is the second electronic ac switch KM2, the described first electronic ac switch KM1 is provided with the first electronic ac switch passage KM1-1 and the second electronic ac switch passage KM1-2, and the described second electronic ac switch passage KM1-2 connects with the electronic ac switch passage on the second electronic ac switch KM2.

Description of drawings

Fig. 1 is the block scheme of control box;

Fig. 2 is electrical schematic diagram;

Fig. 3 is the logical operation figure of Programmable Logic Controller;

Fig. 4 is signal flow graph of the present utility model;

Fig. 5 is workflow diagram of the present utility model.

Embodiment

In conjunction with the utility model accompanying drawing, embodiment of the present utility model be described in detail in detail again be:

The motor start-up process:

When motor is idle, click the first motor start-up button on the capacitive touch screen, this button namely responds, the I1 input port of PLC obtains a high level, process and logical block, output high level, motor circuit is connected, this moment, coil KM1 got electricly, and motor 1 is realized self protective function, first motor start-up; Start motor after a while No. second, click the second motor start-up button at touch-screen, the PLC input interface obtains a high level, and this moment, coil KM2 got electricly, and second motor is realized self protective function, the second motor work.

The motor course of work:

Motor is when operate as normal, under the voltage acquisition module at motor two ends can the voltage acquisition with motor, be sent in the analog quantity input interface of PLC and carry out computing, whether normally the major parameter electric current and voltage of motor just can have demonstration from the LCDs of touch-screen like this, can directly find out motor operation from the electric current and voltage of motor; Simultaneously, the temperature sensor in explosion-proof tank can be with the temperature acquisition in the explosion-proof tank, and the analog quantity input interface by PLC is transferred on the touch-screen, and so, the temperature humidity pressure in the work box etc. just can show by the touch display screen curtain.

Motor stops:

Under the vibratory screening apparatus electric motor normal working, when wanting equipment to quit work, then click first on the touch-screen, the second motor stop button, then have a high level signal to be transmitted the digital-quantity input interface that enters into PLC by cable herein, become low level by not gate, motor circuit disconnects, the first, the second motor quits work.

Touch-screen is realized communicating by letter of Ethernet with PLC.

Capacitive touch screen can carry out programmed process with configuration software, and touch-screen is divided into configuration module one by one, and these modules can replace the button on traditional explosion-proof tank.Button press corresponding high level, be low level during attonity.Its signal is digital quantity.

Because on traditional explosion-proof tank, button can directly carry out mechanical action to inductive switch, thereby finishes the control to motor.And now button is replaced with touch-screen, input then is digital quantity, can't realize that then screen and control box inner control element communicate, and therefore, Programmable Logic Controller PLC is introduced, and addresses this problem effectively.

Its principle is: PLC has the input of digital quantity, and powerful electronic switches such as controllable silicon or IGBT are namely with voltage or the output of the form of electric current.So, input with the PLC digital quantity, replace the machinery input of button, the digital-quantity input interface that is about to the configuration module that set on the touch-screen and PLC is set up a kind of logical relation after by programmed process, namely press the configuration module at screen, then this signal is sent to the input interface of corresponding PLC, PLC carries out corresponding high-power electronic switch output action through after the routine processes, controls the start and stop of motor.

Because the utility model adopts above-mentioned principle of work and structure, therefore, has the following advantages:

At first, adopt touch control motor, eliminated the negative effect that metal clips brings in the mechanical switch; And, friendly man-machine dialog interface can be provided;

Secondly, owing to there is not space that mechanical switch certainly leads to, avoid the intrusion of impurity, moisture, guaranteed the leakproofness of control box, made the work of motor obtain abundant assurance;

The 3rd owing to adopt Programmable Logic Controller to realize communicating by letter between touch-screen and the motor by logical operation, therefore, can regulated at will to the control procedure of motor;

The 4th, owing to adopted Programmable Logic Controller, can conveniently realize the real-time monitoring to the various parameters of motor;

The 5th, because on first electronic ac switch two switch passages are arranged, one of them switch passage is connected with the switch passage of second electronic ac switch, therefore, make the startup of the motor of winning become the necessary condition of second electric motor starting, satisfied the technological requirement of double-deck screen shale shaker.

The 6th, the more important thing is: wholely open or close action, all slap-uply stopped the spark that mechanical reed may produce, make the course of work safer, more quick, meet the special high request of site environment.

The beneficial effects of the utility modelBe:

1) the utility model is oversimplified the control operation in rig well site more, reliabilization, safe;

2) the utility model is owing to adopt plate of flat liquid crystal display, and it is visual to make that all operating process have all realized, wrong possibility occurs and becomes very little; And operation is finer and smoother, and the small action that is difficult to more in the past to realize just can realize now easily;

3) the utility model can both well be operated control by the length setting of cable in far away or closer distance;

4) the utility model makes more safety and reliable of whole solid controlling system.

Claims

1. explosion-proof control box of capacitive touch screen, it is characterized in that: comprise explosion-proof tank, and be positioned at the outer touch-screen of explosion-proof tank, be positioned at the Programmable Logic Controller PLC of explosion-proof tank, first electric machine controller and second electric machine controller, it is characterized in that: touch-screen is connected by the input end of the Programmable Logic Controller PLC in cable and the explosion-proof tank, first output terminal of described Programmable Logic Controller PLC is connected with first electric machine controller, second output terminal of Programmable Logic Controller PLC be connected with second electric machine controller, all switches are easy to generate the mechanical switch of spark without relay etc.

2. the explosion-proof control box of a kind of capacitive touch screen according to claim 1, it is characterized in that: described first electric machine controller is the first electronic ac switch KM1, described second electric machine controller is the second electronic ac switch KM2, the described first electronic ac switch KM1 is provided with the first electronic ac switch passage KM1-1 and the second electronic ac switch passage KM1-2, and the described second electronic ac switch passage KM1-2 connects with the electronic ac switch passage on the second electronic ac switch KM2.