SU907244A1 - Arrangement for remote control of converter and automatic feeder - Google Patents

Description

(54) DEVICE OF REMOTE CONTROL BY CONVEYOR AND FIDER AUTOMATIC

one

The invention relates to the remote control technique of downhole machines and mechanisms and can be applied in mine switching equipment, for example, in controlling magnetic starters operating in explosive environments and having intrinsically safe control circuits.

A remote control device is known in which, in order to ensure the loss of controllability, a diode is turned on at the end of the control line and the intermediate relay is not sensitive to alternating current 1.

The closest to the proposed by i | .nny entity is a remote control device for the conveyor and feeder automat, containing a stabilized power source, a zero protection relay, an executive relay, an intermediate relay, a diode and a control panel with an end relay and end diodes, a capacitor, a resistor and buttons on line 2.

The disadvantages of the known device are: i1) | Ts | resistance of the control line due to the inclusion of zero protection in the winding line of the relay. With a limited power of an intrinsically safe power source, this does not allow the circuit to function reliably when the control line parameters change, since a stable switching of the intermediate relay is not ensured.

In connection with the increase in the length of developed lavas, the level of mechanical and climatic influences on the control lines increases, which makes it necessary to have reliable remote control schemes with significant values of the direct resistance of the control line and. large current leakage between its wires. When available

15 power supplies with limited intrinsically safe power can increase the reliability of remote control circuits while retaining all protection functions only by artificially reducing the forward resistance of the control circuit.

Claims (2)

The purpose of the invention is to increase the reliability and accuracy of remote control of a downhole machine by increasing the number of controlled objects over two wires. This goal is achieved by the fact that the device is equipped with a chain of an additional diode connected in series and an additional intermediate relay and a chain of an additional relay connected in series, a resistor, and two parallel-connected closing contacts of intermediate relays connected to the output of a stabilized power source. a diode and an additional intermediate relay are shunted by a capacitor and parallel to it; a series-connected diode, an intermediate relay and parallel-connected closing contacts of the zero protection relay and an operating relay contact block, with an additional diode in the circuit connected in opposite to the main one. The drawing shows an electrical schematic diagram of the proposed device. The device consists of a control unit 1, two-wire lines 2 and 3 of communication and a control unit 4 of control. The control unit contains a step-down power transformer 5, a rectifying bridge 6, resistors 7-10, capacitors 11-15, zener diode 16, two zener diodes 17, connected back-to-back, closing contacts 18 of the intermediate relay 19, additional relay 20, dpod 21 , additional diode 22, closing contacts 23 of an additional intermediate relay 24, relay 19, 24, times closing contacts 25 (relay 19), relay 26, closing contacts 27 of the executive relay, closing contacts 28 (relay 26), closing contacts 29 (relay 20), diode 30, for closing contacts 31 (p Hardly 19), diode 32. In the control panel there is a button 33 "Stop AFB, end relay 34, capacitor 35, button 36" Stop conveyor, diode 37, button 38 "Start conveyor, resistor 39, diode 40, opening contacts 41 ( relay 34). In the initial state, before powering on and pressing any of the buttons, all relays are disabled. The device works as follows. When the power supply is turned on, add to the ileum. Interrupts} 1os relay 24 and relay 26) protection. Relay 24 is triggered by winding circuit III, resistor 7, additional diode 22, relay winding 24, line 2, button 33 "Stop. LFV" Total stop, resistor 39, diode 40. break contact 41 (relay 34), line 3 connection, and re: ic 2 (but neiHi - winding II, w / a. dummy bridge 6, resistor 8, disconnecting contact 25 (relay 19), resistor 10, winding relay 26. Relay 26, having triggered, for. closes its contacts 28 and creates a circuit for the subsequent operation of the relay 19. Contacts 23 (relay 24) is closed, turn on the relay 20, and with its contacts 29 it closes the switching-on circuit of the AFV and keeps it running. The AVF is operated manually and shut down remotely. Pressing the button 33 "Stop AFV de-energizes intermediate relay 19 and 24, and their open contacts 18 and 23 disconnects relay 20, which leads to the disconnection of the switching-on circuit of the AFV and the feeder circuit breaks the network. When the button 38 is pressed The start of the conveyor switches on the intermediate relay 19 and the end relay 34 along the circuit - button 38, diode 37 button 36 "Stop conveyor, relay winding 34, button 33" Stop AFV, line 2, closed contacts 28 (relay 26), relay 19, diode 21, resistor 7, winding 111, line 3. In this case, the relay 34 with its contacts. 41 blocks a button 38 for dalneyschih circuit operation. Because the direction diodes 21 and 22 are connected in series with the relays 19 and 24, and when the relay 34 is turned on, the polarity of the current in the control circuit changes, for this reason, the relay 24 turns off and the relay 19 turns on. Relay 20 has a trip delay, therefore remains on during relay switching 19 and 24. Relay 19 turns on the conveyor starter by closing contacts 31, and the latter turns on its blocking contacts 27, which bypasses the closed relay contacts 26 and keep the circuit in working condition when the relay 26 is disconnected and the contacts 28 open. Relay 26 has a delay for releasing and switching on and provides zero protection for the remote control circuit. The commands "Stop conveyor is performed by pressing button 36. If the conveyor starter itself shuts off as a result of a voltage drop in the network below 0.65-Unom, its block contacts 27 will break the remote control circuit, while relay 19 will disconnect and disconnect pin 31 that turns off the conveyor starter, opens contact 18, de-energizes relay 20 (and an additional release delay), closes contacts 25 and creates a power supply circuit for relay 26, which does not instantly turn on (delay on activation due to resistor 10 and capacitor 15) and will not close its contacts 28, poe the remote control circuit remains open for some time and the relay 34 is de-energized. Switching from contact 41 (relay 34) switches and energizes an additional intermediate relay 24, and the last, activating, closes contact 23 and activates relay 20, which was briefly de-energized by open contacts 13, therefore, spontaneous switching-off of AFV will not occur and in this case. The invention makes it possible to increase the stability of operation of the apparatus with respect to the resistance of the control line and the leakage between its wires; provide reliable control of mining machines with long lines of control. and increase the number of control commands; ensure stable operation of the remote control system at low mains voltage up to 0.65 Claims of the Invention A remote control device for a conveyor and a feeder machine containing a stabilized power source, a zero protection relay, an executive relay, an intermediate relay, diodes and a control panel with end relays and end relays diodes, a capacitor, a resistor and buttons included in the communication line, characterized in that, in order to increase reliability and control accuracy by increasing the number of com An and control, it is equipped with a circuit from a series-connected additional diode and an additional intermediate relay and a chain of series-connected additional relay, a resistor and two parallel-connected closing contacts of the intermediate relays connected to the output of a stabilized power source, while the circuit from the series-connected additional diode and auxiliary the intermediate relay is shunted by a capacitor and parallel to it, in series, connected in series e diode, and an auxiliary relay connected in parallel zamykayuschie.kontakty zero protection relay and block executive relay contact, wherein an additional diode in the circuit switched counter core. Sources of information taken into account in the examination 1. USSR author's certificate number 256837, cl. E 21 C 35/24, 1968. 2. USSR author's certificate number 630416, cl. E 21 C 35/24, 1976 (prototype).