CN201075172Y

CN201075172Y - Intelligent numerical control protecting equipment

Info

Publication number: CN201075172Y
Application number: CNU2007200135926U
Authority: CN
Inventors: 张世寅; 张文举
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-07-27
Filing date: 2007-07-27
Publication date: 2008-06-18
Anticipated expiration: 2017-07-27

Abstract

The utility model discloses an intelligent numerical control protection device. A sampling circuit 6 is connected with a micro-controller 1 which is connected with a display circuit 2 through a display interface; a memory 5 is connected with the micro-controller 1 which is connected with a relay K1 through a driving circuit; one end of a check circuit 3 is connected with the display circuit 2 and the other end thereof is connected with the recovery terminal of the micro-controller 1. The current states of a motor is collected by the intelligent numerical control protection device through a current transformer and is transmitted to the micro-controller 1 for comparison and judging with parameters which are arranged in advance so as to precisely monitor the operation state of the motor; when unusual malfunctions occur to the intelligent numerical control protection device, the system is reconstructed by the check circuit 3; if the malfunctions occur inside the system, the intelligent numerical control protection device accesses failure secure program, and normal production is not affected. The device can be applied in complex and severe environment and has the advantages of good reliability, high control precision, sensitive reaction, visible display, strong anti-interference capacity, small volume and low cost.

Description

The intelligent numerical control protective device

Affiliated field

The utility model belongs to the control technology field, relates to a kind of intelligent numerical control protective device of protecting the motor operation.

Background technology

Motor protector is a motor protecting device; the motor protecter that uses is to realize with hardware approach substantially now; be mainly the analog of the mechanical type of electrothermal relay and electronic component combination; it is bigger that the mechanical type electrothermal relay is influenced by working environment; and its temperature sense sheet is easily aging; be eliminated gradually, the product of electronic type and have control accurately not high reacts insensitive shortcoming.Since the eighties; microelectric technique has entered in the device of motor protector; make motor protector in structure; obtain further perfect on performance and the function; successively there are a lot of producers to release and have intelligentized supervision and control system; and further develop to networked direction; but the common complex structure of these equipment; cost an arm and a leg; and ubiquity poor stability; can not be in complexity; badly use in the environment; as: overhead traveling crane; Fraquent start; change or impact load etc. make the motor that uses under particular surroundings can not get good protection.

Summary of the invention

At the problem of above-mentioned existence, technical problem to be solved in the utility model provides a kind of can the use under complicated, rugged surroundings, is quick on the draw, control accuracy height, volume is little, cost is low intelligent numerical control protective device.

The technical solution of the utility model is as follows:

Insert microcontroller by sample circuit, microcontroller connects display circuit through display interface, and storer inserts microcontroller, and microcontroller connects relay through driving circuit, and checking circuit one end connects display circuit, and the other end inserts the reset terminal of microcontroller,

Each circuit structure is:

A. described microcontroller, built-in analog-to-digital single-chip microcomputer;

B. described display circuit, shift register 74LS164 connects three LED charactrons, the CLK of mobile register and DATA are connected 19 pin and 18 pin of microcontroller respectively, the section control line parallel of LED charactron, meet the Q1...Q8 of 74LS164 through resistance, the position control line of 3 LED charactrons connects 14 pin, 15 pin, 16 pin of microcontroller respectively;

C. described checking circuit, by Sheffer stroke gate IC1, IC2, IC3, diode D1, D2, D3, resistance R 1, R2, R3, R4, R5, R6 and capacitor C 1, C2, C3, C4 forms, diode D1, the D2 positive pole connects the LED1 charactron and the LED2 charactron position control line of display circuit respectively, negative pole is by resistance R 1, R2, R3, R4, capacitor C 1, the integrating circuit that C2 constitutes, connect 1 pin of IC1,2 pin, 3 pin of IC1 connect 5 pin of IC2, R5, R6 and C3 series connection C4 one end connect, the other end connects 6 pin of IC2 respectively, 8 pin of IC3 connect 9 pin, 10 pin of IC3, the positive pole of diode D3 connects 10 pin of IC3, and negative pole connects 1 pin of microcontroller, resistance R 3, R4, capacitor C 1, C2 all has an end ground connection;

D. described driving circuit, by triode Q3, Q4, resistance R 7, R8, R9, light emitting diode DS1, relay K constitutes, wherein, coil one end of triode Q3 collector connecting relay K1, another termination+24V voltage, the negative pole of light emitting diode DS1 connect triode Q3 base stage, and the DS1 positive pole connects triode Q4 collector, protective resistance R9 one termination+5V voltage, the other end links to each other with microcontroller 17 pin, connects resistance R 7 then and connects triode Q3 base stage, triode Q3, Q4 grounded emitter;

E. described memory, the SCL of 24WC02 connect 7 pin of microcontroller, and SDA connects 6 pin of microcontroller.

This intelligent numerical control protective device; gather the electric electromechanics stream mode by current transformer; after signal rectification filtering; give microcontroller; microcontroller carries out the A/D conversion with it; with the data-storing after the conversion in register; and compare with the parameter that pre-sets; judge; thereby reach the running status of motor is carried out accurate monitoring purposes; when abnormal failure appears in the intelligent numerical control protective device; checking circuit can make system reconfiguration; if internal system breaks down; the intelligent numerical control protective device can enter the failure security procedure, can not influence ordinary production, and this device reliability is good; the control accuracy height; be quick on the draw; intuitive display; antijamming capability is strong; volume is little; cost is low.

Description of drawings

Fig. 1 shows schematic block circuit diagram of the present utility model.

Fig. 2 shows program flow diagram of the present utility model.

Fig. 3 shows circuit theory diagrams of the present utility model.

Among the figure, 1 ,-microcontroller; 2 ,-display circuit; 3 ,-checking circuit; 4 ,-driving circuit; 5 ,-storer; 6 ,-sample circuit

Embodiment

Embodiment of the

present utility model

1,2,3 is described below with reference to the accompanying drawings, and the size of current when sample circuit 6 can react machine operation is delivered to microcontroller 1;

Various parameters and one group of check code word when storer 5 is preserved machine operation;

Display circuit 2 is electric machine operation state indicators, by 74LS164 as display interface device, CLK connects 19 pin of microcontroller 1, DATA connects 18 pin of microcontroller 1, send video data to display circuit 2 by shift register by

microcontroller

1,3 LED charactron position control lines of display circuit 2 connect 14 pin, 15 pin and 16 pin of microcontroller 1 respectively;

Checking circuit 3 connects diode D1 positive pole by LED1 charactron position control line, LED2 charactron position control line connects the D2 positive pole, intelligent numerical control protective device operate as normal, what transmit on the position of LED1 charactron and LED2 charactron control line is one group of normal encoding, and it is low level that this group coding makes 3 pin of IC1, and it can make the oscillator of being made up of IC2, IC3 not work, encode when unusual, 3 pin of IC1 are high level, and oscillator is started working, and makes system reconfiguration;

Driving circuit 4 is when system's operate as normal; 17 pin of microcontroller 1 are high level; this moment, relay K 1 was failure to actuate, when detecting overcurrent, open phase fault, and 17 pin step-down level; relay K 1 action; disconnect motor power, protective resistance R9 was when the intelligent numerical control protective device lost efficacy; guarantee triode Q4 conducting, guarantee that ordinary production is unaffected.

The course of work of the present utility model is as follows:

By the working current sampling of current transformer to motor; sampled data is delivered to microcontroller 1 through the A/D conversion; the parameter of 1 pair of data of sending here of microcontroller and storer 5 compares; judge; show various states by display circuit 2; when faults such as the motor emerged in operation overcurrent or the phase failure; microcontroller 1 is implemented control according to field condition; in order to make the intelligent numerical control protective device in complexity; work under the rugged surroundings; use 2 measures that guarantee system reliability: 1; the checking circuit of being made up of Sheffer stroke gate 3 receives the coding of being sent here by display circuit 2; correct coding can make checking circuit 3 be output as low level; the operation of not influence system; improper coding makes checking circuit 3 be output as pulse train, makes system reconfiguration.2, storer 5 has check code word, when system start-up or reconstruct, detects with the function of check code word to system, repairs when finding fault, when not repairing, adopts the failure security strategy, makes fault can not influence ordinary production.

Claims

1. intelligent numerical control protective device; it is characterized in that; insert microcontroller (1) by sample circuit (6); microcontroller (1) connects display circuit (2) through display interface; storer (5) inserts microcontroller (1), and microcontroller (1) connects relay through driving circuit (4), and checking circuit (3) one ends connect display circuit (2); the other end inserts the reset terminal of microcontroller (1), each circuit structure:

Described microcontroller (1), built-in analog-to-digital single-chip microcomputer;

Described display circuit (2), shift register 74LS164 connects three LED charactrons, the CLK of mobile register and DATA are connected 19 pin and 18 pin of microcontroller (1) respectively, the section control line parallel of LED charactron, meet the Q1...Q8 of 74LS164 through resistance, the position control line of 3 LED charactrons connects 14 pin, 15 pin, 16 pin of microcontroller (1) respectively;

Described checking circuit (3) is by Sheffer stroke gate IC1, IC2, IC3, diode D1, D2, D3, resistance R 1, R2, R3, R4, R5, R6 and capacitor C 1, C2, C3, C4 forms, diode D1, the D2 positive pole connects the LED1 charactron and the LED2 charactron position control line of display circuit (2) respectively, negative pole is by resistance R 1, R2, R3, R4, capacitor C 1, C2 constitutes integrating circuit, connect 1 pin and 2 pin of IC1,3 pin of IC1 connect 5 pin of IC2, R5, R6 and C3 series connection C4 one end connect, the other end connects 6 pin of IC2 respectively, 8 pin of IC3 connect 9 pin, 10 pin of IC3, the positive pole of diode D3 connects 10 pin of IC3, negative pole connects 1 pin of microcontroller (1), resistance R 3, R4, capacitor C 1, C2 all has an end ground connection;

Described driving circuit (4) is by triode Q3, Q4, resistance R 7, R8, R9, light emitting diode DS1; relay K 1 constitutes; wherein, coil one end of triode Q3 collector connecting relay K1, another termination+24V voltage; the negative pole of light emitting diode DS1 connects triode Q3 base stage; the DS1 positive pole connects triode Q4 collector, protective resistance R9 one termination+5V voltage, and the other end links to each other with microcontroller (1) 17 pin; connect resistance R 7 then and connect triode Q3 base stage, triode Q3, Q4 grounded emitter.