CN202886927U

CN202886927U - Controllable delayed power-off circuit used after halt of engineering machine

Info

Publication number: CN202886927U
Application number: CN 201220608614
Authority: CN
Inventors: 肖烈; 车涛; 杨浪; 吴爽; 王锐
Original assignee: HUNAN JIANGJU HEAVY INDUSTRY TECHNOLOGY Co Ltd
Current assignee: HUNAN JIANGJU HEAVY INDUSTRY TECHNOLOGY Co Ltd
Priority date: 2012-11-16
Filing date: 2012-11-16
Publication date: 2013-04-17
Anticipated expiration: 2022-11-16

Abstract

The utility model relates to a controllable delayed power-off circuit used after halt of an engineering machine. The circuit comprises a starting switch, a PLC ( Programmable Logic Controller), a relay K1 for controlling a main power to be powered on or off, a relay K2 for controlling delayed power off, a relay K3 for controlling the K2 to be powered off, an engine flame out device, a power supply, a connecting lead and control software. A coil and a contact of the relay K2, a normally-closed contact of the K3 and the starting switch form a start-retention-stop (self-locking) circuit. After the engineering machine is shut down by using the starting switch, the contact of the K1 is disconnected so that most of electrical appliances of the whole machine are powered off, but the self-locking circuit still ensures that the coil of the K2, the PLC, the power supply and the like are powered on, the PLC still works, and the PLC outputs a signal for disconnecting the self-locking circuit after delay set by PLC software. A controllable delayed power-off power supply can be used by electronic functional units directly connected with the coil of the K2. By using the start-retention-stop circuit in the circuit, the power supply of the PLC can be automatically powered off, and the next power on is not affected; and the parameter of a delayed functional block of the PLC software can be changed, so that controllable delayed power off can be realized.

Description

Controllable time delay power-down circuit after a kind of engineering machinery is shut down

Technical field

The utility model relates to controlled circuit capable of delaying disconnection after a kind of shutdown that can be applicable on the engineering machinery.

Background technology

Along with the PLC(Programmable Logic Controller) development of technology, its application on engineering machinery is also more and more extensive.Adopt PLC control on the engineering machinery, not only can replace traditional relay control device and finish sequence logical control works fine, can also finish solenoid valve proportional control that relay control device do not realize, accurately adjustable speed and the control of orientation closed loop procedure, power match control, intelligent monitoring and fault diagnosis, electronic fuel injection engine control, the functions such as GPS communication and remote monitoring, also have simultaneously the advantages such as volume is little, wiring is simple, control program is variable, greatly improved operating performance and the reliability of engineering machinery.

Along with the function of engineering machinery from strength to strength, electronic functional unit in its electric-control system except PLC is more and more, the quantity of information that each unit need to receive and the data of processing are more and more, its processing and to preserve the needed time of whole useful datas also more and more longer for example is equipped with the electric-control system of printer or video monitoring system.Although PLC can carry out information acquisition and computing and output signal in time, other electronic functional unit is processed a large amount of data volumes can produce a fixed response time.

Under electrifying condition, time delay is not too large and be not easy to be discovered, and does not also affect the operating performance of engineering machinery, but in the instant cut-off situation, some data are because time-delay has little time Storage and Processing just for good and all loses, and this data are important operational data or alert data to a great extent.In another case, the electronic functional unit that has such as GPS and electronic fuel injection engine control module require to continue charging operation number minute or longer time in order to detect after shutting down and data are processed and stored after machinery shutdown.

Engineering machinery does not generally possess the rear delayed-breaking-off function of shutdown at present: after the key switch outage; on the one hand flameout electromagnetic valve (or flame-out motor) dead electricity is cut off oil circuit and is caused engine kill, on the one hand the total relay coil dead electricity of power supply and turn-off the car load power supply.

In order to satisfy the demand of some very important electronic functional unit delay cut-offs, the machinery that has is taked the way of normal power supply, but this method is unnecessary also relatively power consumption; The machinery that also has installs a timing relay additional and realizes in the relevant position of circuit, but delay time is non-adjustable or range of adjustment is little, and additional cost and failure rate.

Summary of the invention

For the deficiency of above-mentioned situation, the utility model provide a kind of can be applicable on the engineering machinery, utilize that PLC and relay jointly control, use safe and intelligent reliably, shut down after controlled Delayed power failure device.

The utility model adopts following design proposal:

A kind ofly shut down rear controlled circuit capable of delaying disconnection; comprise starting switch, PLC, power supply relay K1, relay K 2, relay K 3, engine extinction device, power supply, connection wire and control software; wherein, to have consisted of that the guarantor stops be latching circuit to the series connection of the ACC of the contact of the coil of relay K 2 and contact, K3, starting switch end and B end.

Its principle of work is that after by the starting switch shutdown, the K1 contact disconnects and makes the most of appliance cut-off of car load, but latching circuit still keeps K2 coil and PLC power supply to get electric, PLC is still in work, and after the time-delay through the PLC software set, the PLC output signal disconnects latching circuit.Electronic functional unit direct and the K2 coils from parallel connection of coils just can use controlled delay cut-off power supply.

Description of drawings

Fig. 1 principle of the invention figure.

Embodiment

Further describe below in conjunction with Fig. 1.

Power on: starting switch goes to the gear that powers on, and BR terminal and ACC terminal and B termination are electricly logical, K1 and K2 coil all electric, vehicle circuitry is open-minded.Owing to the contact adhesive of K2, the coil of K2 and contact string consist of latching circuit together simultaneously.

Shut down outage: starting switch goes to the outage gear, and BR terminal and ACC terminal and B end disconnect the K1 coil losing electricity; its contact disconnects; the most circuit of car load disconnects, and engine stops working owing to dead electricity causes oil circuit to cut off, and the power-off signal on the starting switch BR terminal is sent among the PLC simultaneously.And K2 is because self-locking circuit continues adhesive, thereby PLC continues by Power supply, and its program is still being carried out, and begins the timing of delaying time after receiving power-off signal.

Delay cut-off: after the PLC timing was finished, it is electric that output signal gets the K3 coil, and its normally closed contact disconnects, then K2 coil losing electricity, and its contact disconnects, the self-locking circuit outage, PLC and other need the electronic functional unit outage of delay cut-off.After the PLC outage, the K3 coil losing electricity of its control, normally closed contact reverts to closure state, and the K2 coil does not get electric when not affecting next starting switch and powering on.

Claims

1. controllable time delay power-down circuit after an engineering machinery is shut down; comprise starting switch, PLC, power supply relay K1, relay K 2, relay K 3, engine extinction device, power supply, connection wire and control software; it is characterized in that it is latching circuit that the contact of the coil of relay K 2 and contact, K3, the ACC of starting switch end and the series connection of B end have consisted of that the guarantor stops.

2. controllable time delay power-down circuit after a kind of engineering machinery according to claim 1 is shut down; it is characterized in that; starting switch goes to the gear that powers on; BR terminal and ACC terminal and B termination are electricly logical; K1 and K2 coil all electric; vehicle circuitry is open-minded, the simultaneously contact adhesive of K2, and the coil of K2 and contact string consist of latching circuit together.

3. controllable time delay power-down circuit after a kind of engineering machinery according to claim 1 is shut down; it is characterized in that; starting switch goes to the outage gear; BR terminal and ACC terminal and B end disconnect; the K1 coil losing electricity; its contact disconnects; the most circuit of car load disconnects; engine stops working owing to dead electricity causes oil circuit to cut off; power-off signal on the starting switch BR terminal is sent among the PLC simultaneously, and K2 continues adhesive owing to self-locking circuit, thereby PLC continues by Power supply; its program is still being carried out, and begins the timing of delaying time after receiving power-off signal.

4. controllable time delay power-down circuit after a kind of engineering machinery according to claim 1 is shut down; it is characterized in that; after the PLC timing is finished; it is electric that output signal gets the K3 coil; its normally closed contact disconnects, then K2 coil losing electricity, and its contact disconnects; self-locking circuit outage, PLC and other need the electronic functional unit outage of delay cut-off.