CN203324709U

CN203324709U - Mining intrinsic-safety type direct current pilot circuit with fault self diagnosis function

Info

Publication number: CN203324709U
Application number: CN2013203032310U
Authority: CN
Inventors: 肖义; 周峰; 王喆
Original assignee: JIANGSU CRELEAD AUTOMATIC EQUIPMENT Co Ltd
Current assignee: JIANGSU CRELEAD AUTOMATIC EQUIPMENT Co Ltd
Priority date: 2013-05-29
Filing date: 2013-05-29
Publication date: 2013-12-04
Anticipated expiration: 2023-05-29

Abstract

The utility model discloses a mining intrinsic-safety type direct current pilot circuit with a fault self diagnosis function. Diodes D1, D2 are used for controlling the voltage drop on a first leading-out wire to be no less than the forward voltage drop of the diodes D1, D2 during a normal starting process. Resistors R2, R3 cooperate with diodes D7, D8 to provide a threshold comparison voltage for the reverse input end of a voltage comparator. A b-point voltage is made lower than vcc but higher than the forward voltage drop of the two diodes. A c-point voltage is made higher than the forward voltage drop of one diode but lower than the forward voltage drop of two diodes. The mining intrinsic-safety type direct current pilot circuit makes use of a direct current intrinsic-safety power supply to power a mining electric appliance remote control button intrinsic-safety leading-out wire circuit. The voltage comparator is adopted to detect the potential on an intrinsic-safety leading-out wire so as to control signal transmission and further discriminate and isolate false signals caused by false short circuits and virtual connection due to a damaged remote control leading-out wire. Switches between remote control and close control can be conveniently achieved by controlling contacts.

Description

Mine-used I. S direct current precursor circuit with fault self-diagnosis function

Technical field

The utility model relates to a kind of Mine-used I. S direct current precursor circuit with fault self-diagnosis function.

Background technology

The control button intrinsic safety extension line far away of current mine explosion-proof switch adopts the mode of Alternating Current Power Supply more, its advantage is to realize short because far controlling the damaged caused mistake of extension line, virtual connection and the mistake that causes play that signal is differentiated and isolation ratio is more convenient, but the popularization of applying in mine electrical appliance along with current electronic technology and deeply, particularly to the attention of communication function, the appearance of its required intrinsic safety direct supply is also more and more frequent, even become indispensable device in novel switched design, this just two kinds of problems that intrinsic safety electric source coexists occurred, exchanging in addition intrinsically safe circuit also exists required device many, trouble spot is many, take the larger problem of switch inner space resource, for optimization system, simplify circuit, consideration on cost-saving, substitute the interchange intrinsically safe circuit with the direct current intrinsic safety electric source and just become inevitable choice, but must first solve and not change under the prerequisite of user's use habit as far as possible before this, how to because of the damaged caused mistake of control extension line far away mistake short, that virtual connection causes, playing the problem that signal is differentiated and isolated.

The utility model content

In order to overcome above-mentioned defect, the utility model provides a kind of Mine-used I. S direct current precursor circuit with fault self-diagnosis function, and it can be realized because the damaged caused mistake of control extension line far away mistake short, that virtual connection causes plays signal, being differentiated and isolate.

The utility model to achieve these goals, the technological means adopted is: a kind of Mine-used I. S direct current precursor circuit with fault self-diagnosis function, its control start-stop button SW1 far away connects with SW2, and be arranged in the explosion-proof button box, the negative electrode of diode D1 is connected with control start-stop button SW1 far away, the anode of diode D1 connects extension line No. 1, the anode of diode D2 is connected with control start-stop button SW2 far away, its negative electrode connects extension line No. 3, draw extension line No. 2 between control start-stop button SW1 far away and SW2, the anode of described No. 1 extension line and diode D3 joins, the negative electrode of diode D3 joins with nearly control start-stop button SW3, the other end of nearly control start-stop button SW3 joins with nearly control start-stop button SW4, the other end of nearly control start-stop button SW4 and the anodic bonding of diode D4, the negative electrode of diode D4 and No. 5 extension lines join with the normally closed contact of relay K 1 respectively, No. 2 extension lines and No. 3 extension lines join with the normal opened contact of relay K 1 respectively, the anode of the anode of diode D5 and diode D3 joins, and the negative electrode of diode D5 is connected 2 by the self-locking contact with relay K 1, the common port of the normally-open normally-close contact of No. 5 lines is connected, relay K 1 coil one termination power vcc, diode D6 in addition with relay K 1 coils from parallel connection of coils, the collector of relay K 1 coil other end connecting triode T3, the base stage of triode T3 connects the KZ terminal, its grounded emitter, No. 1 extension line of a termination of described resistance R 1, the other end is connected with power supply vcc, resistance R 2 one ends are connected with power supply vcc, the other end is connected with the anode of diode D7, the negative electrode of diode D7 is by the anodic bonding of potentiometer R3 and diode D8, the plus earth of diode D8, the negative input end of voltage comparator J1 is connected between resistance R 2 and diode D7, the positive input terminal of the positive input terminal of voltage comparator J1 and voltage comparator J2 is connected in extension line jointly No. 1, the power supply termination electricity of voltage comparator J1, earth terminal ground connection, the negative input termination potentiometer R3 sliding end of voltage comparator J2, the output terminal of voltage comparator J1 joins by resistance R 4 and the base stage of triode T1, the grounded emitter of triode T1, its collector is connected to the base stage of triode T2, the output terminal of voltage comparator J2 joins by resistance R 5 and the base stage of triode T2, and a capacitor C ground connection arranged, its grounded emitter of triode T2, collector is connected with relay K 2, the contact output of relay K 2.

Described diode D1, D2, D3, D4 is replaceable is resistance or stabilivolt.

By 2 diode D1, D2, coordinate voltage comparator J1, J2 effectively to monitor the working condition of intrinsic safety extension line.

The beneficial effects of the utility model: while with the direct current intrinsic safety electric source, to mine electrical appliance, far controlling the power supply of button intrinsic safety lead line, realize the transmission of control signal and, to because the damaged caused mistake of control extension line far away mistake short, that virtual connection causes plays signal, being differentiated and isolate, can conveniently realize the switching of far and near control by controlling contact simultaneously by utilizing voltage comparator to detect current potential on the intrinsic safety extension line.

The accompanying drawing explanation

Fig. 1 is circuit theory diagrams of the present utility model.

Embodiment

Below in conjunction with concrete embodiment and accompanying drawing, the utility model is further elaborated.

As described in Figure 1, a kind of Mine-used I. S direct current precursor circuit with fault self-diagnosis function, its control start-stop button SW1 far away connects with SW2, and be arranged in the explosion-proof button box, the negative electrode of diode D1 is connected with control start-stop button SW1 far away, the anode of diode D1 connects extension line No. 1, the anode of diode D2 is connected with control start-stop button SW2 far away, its negative electrode connects extension line No. 3, draw extension line No. 2 between control start-stop button SW1 far away and SW2, the anode of described No. 1 extension line and diode D3 joins, the negative electrode of diode D3 joins with nearly control start-stop button SW3, the other end of nearly control start-stop button SW3 joins with nearly control start-stop button SW4, the other end of nearly control start-stop button SW4 and the anodic bonding of diode D4, the negative electrode of diode D4 and No. 5 extension lines join with the normally closed contact of relay K 1 respectively, No. 2 extension lines and No. 3 extension lines join with the normal opened contact of relay K 1 respectively, the anode of the anode of diode D5 and diode D3 joins, and the negative electrode of diode D5 is connected 2 by the self-locking contact with relay K 1, the common port of the normally-open normally-close contact of No. 5 lines is connected, relay K 1 coil one termination power vcc, diode D6 in addition with relay K 1 coils from parallel connection of coils, the collector of relay K 1 coil other end connecting triode T3, the base stage of triode T3 connects the KZ terminal, its grounded emitter, No. 1 extension line of a termination of described resistance R 1, the other end is connected with power supply vcc, resistance R 2 one ends are connected with power supply vcc, the other end is connected with the anode of diode D7, the negative electrode of diode D7 is by the anodic bonding of potentiometer R3 and diode D8, the plus earth of diode D8, the negative input end of voltage comparator J1 is connected between resistance R 2 and diode D7, the positive input terminal of the positive input terminal of voltage comparator J1 and voltage comparator J2 is connected in extension line jointly No. 1, the power supply termination electricity of voltage comparator J1, earth terminal ground connection, the negative input termination potentiometer R3 sliding end of voltage comparator J2, the output terminal of voltage comparator J1 joins by resistance R 4 and the base stage of triode T1, the grounded emitter of triode T1, its collector is connected to the base stage of triode T2, the output terminal of voltage comparator J2 joins by resistance R 5 and the base stage of triode T2, and a capacitor C ground connection arranged, its grounded emitter of triode T2, collector is connected with relay K 2, the contact output of relay K 2.

Described diode D1, D2, D3, D4 is replaceable is resistance or stabilivolt.

By 2 diode D1, D2, coordinate voltage comparator J1, J2 effectively to monitor the working condition of intrinsic safety extension line.。

Described diode D1, D2 are for controlling No. 1 pressure drop on extension line when normally starting, be not less than the forward conduction voltage drop of two diodes, SW3, SW4 are nearly control start-stop button, diode D3, D4 effect are identical with diode D1, D2, pressure drop when diode D5 makes to start self-locking on No. 1 extension line keeps being not less than the forward conduction voltage drop of two diodes, resistance R 1 is for limiting the electric current on extension line, whether the action of KZ terminal by triode T3 pilot relay K1 to be, thus control be far control the start-stop button or closely control the start-stop button effective; Resistance R 2, R3 match with D7, D8 and are used to voltage comparator J1, J2 reverse input end that the threshold comparative voltage is provided, and make the b point voltage lower than power supply vcc and higher than the forward conduction voltage drop of two diodes; Make the c point voltage higher than a diode forward conduction voltage drop and lower than 2 diode forward conduction voltage drops.

Its principle of work is as follows: when circuit is normal, no matter far control is near controls, while not according to start button (SW1 or SW3) or after starting self-locking, pressing stop button (SW2, SW3), a point current potential equals vcc, voltage comparator J1 exports noble potential, triode T1 conducting makes triode T2 cut-off, and relay k2 is motionless, and output contact is opened; While pressing start button and stop button closure, a point current potential equals 2 diodes (being D1 and D2 while far controlling, is D3 and D4 while closely controlling) dividing potential drop, voltage comparator J1 exports electronegative potential, triode T1 cut-off, and J2 output noble potential makes triode T2 conducting, relay K 2 actions, the output contact closure.

In the explosion-proof button box, element rises, closely stops 2 buttons with near, on figure, other all function element all concentrate on a wiring board as a road pilot circuit, but be connected with external circuit by the plug connection terminal, accomplish miniaturization, in the convenient combination of the occasions such as combined switch, the KZ contact can, by PLC or Single-chip Controlling, be realized the centralized control of far and near control.Control signal is realized the isolation of transmission and intrinsically safe circuit and non-intrinsic safety by relay K 2 contacts.Because closely control circuit, be in explosion-proof shell, control extension line far away because of outside cabling the mistake that causes of incident cable failure play phenomenon and substantially not there will be, therefore the consideration on simplifying for circuit, 2 diode D3, the D4 that should be connected nearby with nearly control button can be made in plate, so nearly control button not done and missed detection.

Claims

1. the Mine-used I. S direct current precursor circuit with fault self-diagnosis function, its control start-stop button SW1 far away connects with SW2, and be arranged in the explosion-proof button box, the negative electrode of diode D1 is connected with control start-stop button SW1 far away, the anode of diode D1 connects extension line No. 1, the anode of diode D2 is connected with control start-stop button SW2 far away, its negative electrode connects extension line No. 3, draw extension line No. 2 between control start-stop button SW1 far away and SW2, it is characterized in that: the anode of described No. 1 extension line and diode D3 joins, the negative electrode of diode D3 joins with nearly control start-stop button SW3, the other end of nearly control start-stop button SW3 joins with nearly control start-stop button SW4, the other end of nearly control start-stop button SW4 and the anodic bonding of diode D4, the negative electrode of diode D4 and No. 5 extension lines join with the normally closed contact of relay K 1 respectively, No. 2 extension lines and No. 3 extension lines join with the normal opened contact of relay K 1 respectively, the anode of the anode of diode D5 and diode D3 joins, and the negative electrode of diode D5 is connected 2 by the self-locking contact with relay K 1, the common port of the normally-open normally-close contact of No. 5 lines is connected, relay K 1 coil one termination power vcc, diode D6 in addition with relay K 1 coils from parallel connection of coils, the collector of relay K 1 coil other end connecting triode T3, the base stage of triode T3 connects the KZ terminal, its grounded emitter, No. 1 extension line of a termination of described resistance R 1, the other end is connected with power supply vcc, resistance R 2 one ends are connected with power supply vcc, the other end is connected with the anode of diode D7, the negative electrode of diode D7 is by the anodic bonding of potentiometer R3 and diode D8, the plus earth of diode D8, the negative input end of voltage comparator J1 is connected between resistance R 2 and diode D7, the positive input terminal of the positive input terminal of voltage comparator J1 and voltage comparator J2 is connected in extension line jointly No. 1, the power supply termination electricity of voltage comparator J1, earth terminal ground connection, the negative input termination potentiometer R3 sliding end of voltage comparator J2, the output terminal of voltage comparator J1 joins by resistance R 4 and the base stage of triode T1, the grounded emitter of triode T1, its collector is connected to the base stage of triode T2, the output terminal of voltage comparator J2 joins by resistance R 5 and the base stage of triode T2, and a capacitor C ground connection arranged, its grounded emitter of triode T2, collector is connected with relay K 2, the contact output of relay K 2.

2. a kind of Mine-used I. S direct current precursor circuit with fault self-diagnosis function according to claim 1 is characterized in that: described diode D1, D2, D3, D4 is replaceable is resistance or stabilivolt.

3. a kind of Mine-used I. S direct current precursor circuit with fault self-diagnosis function according to claim 1, is characterized in that: by 2 diode D1, D2, coordinate voltage comparator J1, J2 effectively to monitor the working condition of intrinsic safety extension line.