CN203246829U

CN203246829U - Belt operation control system

Info

Publication number: CN203246829U
Application number: CN 201320265488
Authority: CN
Inventors: 马刚
Original assignee: JINAN EAST AUTOMATIC CONTROL ENGINEERING Co Ltd
Current assignee: JINAN EAST AUTOMATIC CONTROL ENGINEERING Co Ltd
Priority date: 2013-05-16
Filing date: 2013-05-16
Publication date: 2013-10-23
Anticipated expiration: 2023-05-16

Abstract

The utility model discloses a belt operation control system, and especially aims at spillage and slippage control during the operation process of a belt. The system comprises a programmable logic controller (PLC), output ends of the PLC are connected to an audible and visual alarm and a motor of the belt, input ends of the PLC are connected to a first proximity switch, a second proximity switch and an industrial personal computer, the first proximity switch and the second proximity switch are arranged at a drive roller and a driven roller of the belt respectively, the industrial personal computer is connected with a camera, and the camera is disposed at a dynamic detection region. Dynamic detection is carried out to regions where the belt slips and easily spills, a program can automatically transmit a breakdown signal to the PLC if breakdown occurs, and the PLC can carry out automatic stop or audible and visual alarm to the corresponding belt. The industrial control is more accurate and timely. The camera, the industrial personal computer and the PLC are all conventional equipment in factories and are low in cost.

Description

A kind of belt operation control system

Technical field

The utility model relates to a kind of belt operation control system.

Background technology

In industries such as metallurgy, generating, coals, it is very general industrial flow that the belt of material transmits, and some factory can be sent to material beyond several kms through the dozens of transfer point.Belt transmits field apparatus is had relatively high expectations; in case shutting down or skidding appears in certain belt of intermediate link; follow-up belt must be at once out of service; otherwise material can be deposited on the fault belt; if find untimely; may cause all fronts of whole factory to stop production, bring huge economic loss.

Present industrial control field in order to save human cost, is limited by on-the-spot abominable dust atmosphere simultaneously, can set up centralized control room, and the workman carries out centralized control and operation monitoring in operator station to all belts.In the middle of actual use procedure, often can run into following two problems:

1) conventional belt slip detector complex structure, repair and maintenance is more loaded down with trivial details, and can't guarantee its functional reliability under abominable industrial environment.

2) traditional industry control can't be made automatic decision to the belt spreading, generally speaking, camera can be installed at important belt by factory, and the real-time imaging that belt is moved is sent to operator station, but video monitoring and Industry Control are the independent systems of two covers.Operation monitors that the spreading of belt is judged by human eye to the workman to belt by monitoring device.In the more situation of watch-dog, erroneous judgement often can appear at the scene.

Summary of the invention

The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art, a kind of belt operation control system being provided, particularly for the spreading in the belt operational process and the control of skidding.

For achieving the above object, the utility model adopts following technical proposals:

A kind of belt operation control system, comprise PLC, the mouth of PLC is connected to respectively the motor of combined aural and visual alarm and belt, the input end of PLC is connected with approach switch I, approach switch II, industrial computer respectively, described approach switch I and approach switch II are arranged at respectively active roll tube and the driven roller place of belt, described industrial computer is connected with camera, and described camera is arranged at the detection of dynamic zone.

Described detection of dynamic region division is in the zone of easy spreading.

Principle of work of the present utility model:

Normally move in the non-slip situation at belt, belt motor drives active roll tube, and active roll tube drives belt, and belt drives driven roller, and active roll tube is identical with driven roller linear velocity.Slipping of the belt is to slide between active roll tube and the belt, and this moment, the linear velocity of driving and driven roller occurred than big difference.An approach switch is installed respectively on driving and driven roller, every one week of rotation, send the pulsatile once signal to PLC, the real-time driving and driven roller of recording rotates all used time, when larger change occurs the difference of two times, can judge slipping of the belt.

The utility model is applied to industrial control field with the dynamic detection technology of video image, the video image of the video frequency collection card collection site camera by industrial computer, and carry out detection of dynamic in the zone of easily spreading.When the belt spreading; it is long-pending that the detection of dynamic zone has stockpile in the picture that camera is truncated to; compare with the detection of dynamic zone of normal pictures before; pixel can change, and current picture and the picture of last second are compared, and pixel is poor above less threshold value (threshold value II); think spreading; industrial computer sends the spreading signal to PLC, and PLC guide sound light crossing-signal sends warning, otherwise is not spreading.After determining the belt spreading, current picture and the picture before 3 seconds are compared, pixel is poor then to be thought serious spreading has occured above larger threshold value (threshold value III), and serious spreading appears in judgement in continuous 3 seconds, directly stops the belt operation by PLC.

The beneficial effects of the utility model are, the utility model is used for judging slipping of the belt, and are electric, physical construction is simple, and easy access is safeguarded, and can be adapted to more widely various abominable industrial environments.Judge belt spreading aspect, used the video dynamic detecting technology.After being judged as spreading for the first time, can carrying out secondary and judge.Two threshold values (threshold value II and threshold value III) are set distinguish slight spreading and serious spreading.And this decision method does not allow to be subject to the impact of the external factors such as light.The utility model carries out detection of dynamic to the zone of slipping of the belt and easily spreading, and if there is fault, program can send breakdown signal automatically to PLC, and PLC can carry out auto-stop or sound and light alarm to the corresponding belt in scene.Industry Control more accurately and timely.Camera, industrial computer, PLC are the conventional use equipment of factory, and be with low cost.

Description of drawings

Fig. 1 is structural representation of the present utility model;

Fig. 2 is diagram of circuit of the present utility model;

1. cameras wherein, 2. industrial computer, 3.PLC, 4. combined aural and visual alarm, 5. approach switch I, 6. approach switch II, 7. motor.

The specific embodiment

Below in conjunction with drawings and Examples the utility model is further set forth, should be noted that following explanation only is in order to explain the utility model, its content not to be limited.

As shown in Figure 1, the utility model comprises PLC3, the mouth of PLC3 is connected to respectively the motor 7 of combined aural and visual alarm 4 and belt, the input end of PLC3 is connected with approach switch I5, approach switch II6, industrial computer 2 respectively, approach switch I5 and approach switch II6 are arranged at respectively active roll tube and the driven roller place of belt, industrial computer 2 is connected with camera 1, and camera 1 is arranged at the detection of dynamic zone, and the detection of dynamic region division is in the zone of easy spreading.

As shown in Figure 2, the control method of above-mentioned belt operation control system, concrete steps are as follows:

1) region division with easy spreading is the detection of dynamic zone, and belt starts operation, carry out step 2 simultaneously) and step 3);

2) active roll tube of writing down belt rotates the time T in a week and the time t that driven roller rotates a week, if t-T greater than threshold value I, and delay time arrives, and then enters step 8), if t-T is not more than threshold value I, end of program;

3) per second gathers a video image, per 3 seconds one group, deposit respectively 3 video images in buffer memory A, buffer memory B, buffer memory C according to the sequencing of acquisition time, enter step 4);

4) collect new video image in current second, the video image in itself and the C is carried out pixel comparison, if pixel difference greater than threshold value II, then is judged to be the belt spreading, enter step 6); If be not more than threshold value II, then be judged to be not spreading of belt, enter step 5);

5) video image in the B is covered video image, the video image in the C in the A and cover the new video image that gathers in video image in the B, the step 4) and cover video image in the C, return step 4);

6) industrial computer 2 is sent to PLC3 with the spreading signal, the spreading warning is sent in 4 time-delays of PLC3 guide sound light crossing-signal, the new video image that gathers in the step 4) and the video image in the A are carried out pixel comparison, if pixel difference is not more than threshold value III, then be judged to be the slight spreading of belt, return step 5); If pixel difference, then is judged to be the serious spreading of belt greater than threshold value III, enter step 7);

7) record the number of times that serious spreading occurs, if serious spreading occurs continuous 3 times in 3 seconds, then enter step 8); If no, return step 5);

8) PLC3 control belt is out of service.

Wherein, threshold value III is far longer than threshold value II.

In the step 1), after belt started operation, motor 7 drove active roll tube and rotates, and active roll tube drives driven roller by belt and rotates.

Step 2) concrete steps are:

21) active roll tube whenever circles, and approach switch I5 sends the pulsatile once signal to PLC3, and previous impulse singla begins timing, sends to the next pulse signal, is designated as the time T that active roll tube rotates a week;

22) driven one week of roller revolution, approach switch II6 sends the pulsatile once signal to PLC3, and previous impulse singla begins timing, sends to the next pulse signal, is designated as the time t that driven roller rotates a week.

In the step 3), the video image of the video frequency collection card collection site camera 1 by industrial computer 2.

In the step 6), industrial computer 2 sends the spreading signal by the CP5611 address card to PLC3.

Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present utility model is described; but be not the restriction to the utility model protection domain; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection domain of the present utility model.

Claims

1. belt operation control system, it is characterized in that, comprise PLC, the mouth of PLC is connected to respectively the motor of combined aural and visual alarm and belt, the input end of PLC is connected with approach switch I, approach switch II, industrial computer respectively, described approach switch I and approach switch II are arranged at respectively active roll tube and the driven roller place of belt, and described industrial computer is connected with camera, and described camera is arranged at the detection of dynamic zone.

2. a kind of belt operation control system according to claim 1 is characterized in that, described detection of dynamic region division is in the zone of easy spreading.