SU1726331A1 - Device for blocking conveyer drive - Google Patents

Abstract

The invention relates to mining electrical engineering, mainly to intrinsically safe devices for remote emergency and emergency disconnection of conveyors. The purpose of the invention is to expand the functionality by increasing the selective commands. For this, the device contains an alternating current source, sensing elements, a control signal generating unit, an executive unit, a pulse shaper, diodes, high-frequency transformers, communication line wires, and sensors. The device is equipped with a second high-frequency transformer, three diodes and sensors of the belt catcher and the tension drum limit state, the contacts of which are included in the communication line in a certain way. 2 Il.

Description

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WITH

The invention relates to mining electrical engineering, mainly to intrinsically safe devices for remote emergency and emergency shutdown of conveyors or other flow-conveying mechanisms.

A conveyor control device is known, which includes tape derailment sensors and emergency shutdown switches, which ensure that the conveyor drive is blocked when the switches and sensors are triggered, as well as when the communication line is interrupted or short-circuited.

This device has the following disadvantages: the ability to transfer only one command to disable and block the drive of the conveyor; no explanation of the reason for shutting down and blocking the drive.

The closest in technical essence to the present invention is a device for locking the conveyor drive containing an alternating current source, sensitive elements with galvanic uncoupling (optocouplers), a two-wire communication line with series-connected cable-torsion switches and parallel-connected tape derailment sensors, terminal diode , output unit, pulse shaper, high-frequency transformer, logic unit, sensor for monitoring the state of the fence on the landing pads and diodes, while forming The pulses are connected between the cathode of the end diode and the second wire of the two-wire communication line, and the sensor for monitoring the state of the fence on the landing sites is connected in parallel with the sensors of the belt between the first and second

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wires of the two-wire communication line, while between the first wire of the two-wire communication line and the sensor monitoring the state of the fence on the landing pads a terminal diode of the opposite polarity is connected, and between the sensors of the tape derailment and the first wire of the two-wire communication line the diodes are connected similarly to the terminal one, the primary winding a high-frequency transformer is connected between the first output of the selector polar signals and the first wire of the two-wire communication line, the second and third outputs of the pulse selector are connected to respectively to first and second inputs of the logic block to the third input of which is connected to the secondary winding of the high-frequency transformer, the logic unit output is connected to the input of the output unit.

A disadvantage of the known device is the possibility of transmitting only four types of selective commands to disconnect the drive of the conveyor (transmitted via a two-wire communication line).

In addition to self-monitoring of the serviceability of the line, it is possible to send commands to disconnect the drive when the tape dismounts to the side in the absence of a protective barrier and affecting the cable-pull switch, which is not enough in some cases.

Depending on the type of conveyor (cargo, cargo people, equipped with belt catchers, equipped with brakes), the presence of electrical protections and fire detectors, commands are required to turn off and lock the drive when passing by the person of the vanishing point, triggering the belt catchers, spontaneously applying a brake. , actuator electrical protection triggered, signal from automatic fire detection equipment, etc.

Depending on the type of commands, an emergency or emergency stop must be carried out (except for operational), as well as to establish the reason for the conveyor stop, this reason must be indicated and the device must distinguish these commands, therefore it is necessary for each sensor (except those included in the communication line) to have own device or communication line.

The purpose of the invention is to expand the functionality by increasing the selective commands to disable the conveyor drive.

This goal is achieved by the fact that a conveyor drive locking device containing an AC source, the first terminal of which is connected to the input

the first sensitive element, one output of which is connected to the first input of the control signal generating unit, the output of which is connected to the executive unit, the second sensitive element, the output of which is connected to the second input of the control signal generating unit, first pulse generator, first diode , one output of the excitation winding of which is connected via the first wire in the two-wire communication line to one output of the disconnecting contact of the emergency shutdown sensor, and one onets second

5 wires of the two-wire communication line are connected to the second output of the AC source, one output of the secondary winding of the first high-frequency transformer is connected to the third input of the control signal generation unit, and the other output to the zero potential bus, the circuit, one of which is connected in series the closing contact of the tape vanishing sensor and the second diode turned back on, and the other from the series-connected closing contact of the fence control sensor and the third straight-on The iodine connected between the two wires of the two-wire communication line is equipped with a second high-frequency transformer, fourth, fifth and sixth diodes and sensors of the catcher and the limit state of the tension drum with closing and disconnecting terminals, with the series-connected contact sensor of the catcher the tape and the fourth diode turned back on are connected between two wires of the two-wire communication line,

0 serially connected make contact of the sensor of the limiting state of the tension drum and a directly connected fifth diode are also connected between two wires of the two-wire communication link, the disconnecting contact of the sensor of the belt catcher is connected by one output to the combined closing contact of the corresponding sensor and the second wire of the two-wire connecting line and, with another output, directly to it, the opening contact of the tension drum limit state sensor is connected by one output to the integral closing terminal tact of the corresponding sensor and

5 to the second wire of the two-wire communication line, and the other output through the pulse shaper to the first wire of the two-wire communication line; the other output of the first sensing element is connected via a directly connected first diode to another

By connecting the excitation winding of the first high-frequency transformer, the first output of the alternating current source is also connected via a serially connected second sensing element and the sixth diode is connected back to one output of the excitation winding of the second high-frequency transformer, the other output of which is connected to one end of the first high-frequency transformer, one the output of the secondary winding of the second high-frequency transformer is connected to the fourth input of the control signal generating unit, and the other is with a zero potential tire.

FIG. 1 shows a block diagram of the device; in fig. 2 - a table of signal states at the inputs of the logic unit.

The blocking device of the conveyor drive (Fig. 1) contains a source of alternating current 1, the first output of which is connected to the input of the first sensitive element 2, one output of which is connected to the first input of the control signal generating unit 3, the output of which is connected to the executive unit 4, the second sensitive element 5, the output of which is connected to the second input of the control signal generating unit 3, pulse shaper 6, first diode 7, first high-frequency transformer 8, one input of which excitation winding under It is connected via the first wire 9 on the two-wire communication line to one output of the disconnecting contact of the emergency shutdown sensor 10, and one end of the second wire 11 of the two-wire communication line is connected to the second output of the AC source 1, one output of the secondary winding of the first high-frequency transformer 8 is connected to the third input of the control signal generation unit 3, and the other output is connected to the zero potential bus, a circuit, one of which consists of serially connected closing contact of the tape vanishing sensor 12 and reverse The second diode 13 is switched on, and the other is from the series-connected closing contact of the sensor 14 of the fence control and the directly connected third diode 15 connected between two wires 9 and 11 of the two-wire communication line, the second high-frequency transformer 16, the fourth 17, the fifth, 18 and the sixth 19 diodes, sensors 20 and 21 of the belt catcher of the limiting condition of the tension drum with closing and opening contacts, with the serially connected closing contact of the sensor of the belt catcher 20 and the reverse of the fourth diode 17 VC These are between two conductors 9 and 11 of a two-wire communication line, serially connected closing contact sensors 21 of a tension drum limit state and a directly connected fifth diode 18 are also connected between two wires 9 and 11 of a two-wire communication line, the breaker contact of the sensor 20 the tape is connected by one lead to the combined closing contact of the corresponding sensor and to the second wire 11 of the two-wire communication line, and the other lead to it directly, open; The contact of the sensor 21 of the tensioned drum limit state is connected by one output to the combined closing contact of the corresponding sensor and the second wire 11 of the two-wire communication line, and the other output through the pulse shaper b to the first wire 9 of the two-wire communication line 2 is connected via a directly connected first diode 7 to a different output of the excitation winding of the first high-frequency transformer 8, the first output of the AC source 1 is also connected via the last optically connected second sensitive element 5 and a reverse sixth diode 19 to one output of the excitation winding of the second high-frequency transformer 16, the other output of which is connected to one end of the first high-frequency transformer 8, one output of the secondary winding of the second high-frequency transformer 16 is connected to the fourth input of the control generation unit 3 signal, and the other with a zero potential bus, as well as converters 22-25. installed at the inputs of the logic block 5, the decoder 26, the inputs of which are connected to the outputs of the converters 22-25, the delay node 27 connected to one of the outputs of the decoder 26, the display device 28 and the OR circuit 29 and 30 whose inputs are connected to the outputs of the decoder 26.

As sensitive elements 2 and 5, optocouplers, electromagnetic relays, or other elements having galvanic separation of input and output electric circuits can be used,

As a shaper of 6 pulses, two dinistors can be used, connected in opposite directions and forming a steep front of the pulse of both positive and negative polarity.

High-frequency transformers 8 and 16 are transformers, on the secondary windings of which a signal appears in the event that a formed (high-frequency) signal having a steep front occurs on their excitation windings. During the flow through the excitation windings of these transformers, pulses of sinusoidal current on their secondary windings and the corresponding inputs of the control signal generating unit 3 are absent.

For convenience of describing the principle of operation of the device, the polarity of current pulses flowing from wire 9 to wire 11. is conventionally accepted positive, and the polarity of current pulses flowing from wire 11 to wire 9 is negative.

The device locking the drive of the conveyor operates as follows.

In the initial state, the contacts of the sensors 12 of the belt runoff and 14 of the control of the fence are open, and the contacts of the emergency shutdown switches 10 are closed, the closing part of the sensors 20 of the tape catcher and the limit state of the tension drum 21 is open.

A positive polarity current flows through the optocoupler 2, diode 7, excitation winding of the high-frequency transformer 8, drive 9, emergency shutdown contacts 10, pulse shaper b, opening contacts of sensors 21 and 20, and drive 11.

Since the current of positive polarity flows through the pulse shaper 6, its pulses have a steep front, as a result, a signal is received from the secondary winding of the high-frequency transformer 8 to the third input of unit 3. At the same time, the optocoupler 2 generates a signal at the first input of the block 3.

A negative polarity current flows along the wire 11 through the disconnecting contacts of the sensors 20 and 21, the pulse shaper 6, the contacts of the switches 10, the wire 9, the excitation winding of the high-frequency transformer 16, the diode 19 and the optocoupler 5.

Since the current of negative polarity flows through the pulse shaper 6, its pulses have a steep front, as a result, a signal is sent from the secondary winding of the high-frequency transformer 16 to the fourth input of unit 3. At the same time, the optocoupler 5 generates a signal to the second input of the block 3.

Thus, in the initial state, corresponding to the normal mode of operation of the conveyor and in good condition (no open circuit and short circuit) of the communication line, all four inputs of block 5 will have signals (Fig. 2, line 1).

When triggered by one of the sensors 12 of the gathering of the tape, the current of positive polarity flows in the same way as the initial state, resulting in the first and

the third inputs of block 3 are output signals. The current of negative polarity flows along the wire 11 through the closed contact of the sensor 12 of the gathering of the tape, the excitation winding of the high-frequency transformer 16, the diode

0 19 and optocoupler 5. Since the current of negative polarity does not flow through the driver 6 pulses, the signal is not received at the fourth input of block 3. To the second input of block 3, the signal comes from the optocoupler 5.

5 Thus, when triggering the sensor 12 gathering tape on the first, second and third inputs of block 3 will be signals (Fig. 2, line 2).

When one of the cable switches 10 triggers through the optocouplers 8 and 16, no current will flow, as a result, there is no signal at all four inputs of the logic block 5 (Fig. 2, line 3).

When triggered sensor 14 control

The fences 5 of the negative polarity flow in a manner similar to the initial state, as a result of which signals are output to the second and fourth inputs of block 3. The current of positive polarity flows through

0 optocoupler 2, diode 7, excitation winding of high-frequency transformer 8, wire 9, diode 15, closed contact of sensor 14 of the control of the fence and drive 11. Since the current of positive polarity does not flow through the driver 6 pulses, the third input of the block 3 does not receive a signal . At the first input of block 3, the signal comes from the optocoupler 2.

Thus, when sensor 14 triggers, the fencing controls on the first, second, and fourth inputs of logic block 3 will have signals (Fig. 2, line 4).

In case of short circuit of wires 9 and 11 of the communication line, a positive field current of p5 flows through the optocoupler 2, diode 7, excitation winding of the high-frequency transformer 8, wire 9, place of short circuit of the communication line and wire 11. Negative polarity flows through

0 through the wire 11 through the short-circuit point of the communication line, the wire 9, the excitation winding of the high-frequency transformer 16, the diode 19 and the optocoupler 5.

Since the current is both positive and

5 of the negative polarity does not flow through the shapers of 6 pulses; no signals are received at the third and fourth inputs of block 3. The signals from optocouplers 2 and 5 arrive at the first and second inputs of block 3 (Fig. 2, line 5).

When the sensor 20 of the tape catcher 20 is triggered, its contact in the circuit of diode 17 is closed and the contact included in the wire break 11 is opened, as a result, the positive polarity does not flow and the first and third inputs of unit 3 do not receive signals. The negative polarity current flows through the wire 11 through the diode 17, the wire 9, the excitation winding of the high-frequency transformer 16, the diode 19 and the optocoupler 5. Since the negative polarity does not flow through the driver 6, the signal will not go to the fourth input of the unit 3. The signal from the optocoupler 5 arrives at the second input of unit 3 (Fig. 2, line 6).

When the sensor of the limiting state of the tension drum 21 is triggered, its contact is closed in the circuit of diode 18 and the contact included in the wire break 11 is closed. As a result, the current of negative polarity does not flow and the second and fourth inputs of unit 3 do not receive signals. The current of positive polarity flows through the optocoupler 2, diode 7, excitation winding of the high-frequency transformer 8, wire 9, contact of emergency shutdown switch 10, diode 18, contact of sensor 20 and wire 11. Since the current of positive polarity does not flow through the driver 6 pulses The third input of block 3 does not receive a signal. At the first input of block 3, the signal comes from the optocoupler 2 (Fig. 2, line) ..

The proposed device, in comparison with the known ones, makes it possible to transmit a greater number of selective commands to disconnect the conveyor drive via a two-wire communication line.

FORUMAWLAH AND ISLANDS

A conveyor drive blocking device containing an AC source, the first output of which is connected to the input of the first sensing element, one output of which is connected to the first input of the control signal generating unit, the output of which is connected to the executive unit, the second sensitive element, whose output is connected to the second input of the control signal forming unit, the pulse shaper, the first diode, the first high-frequency transferor, one output of the excitation winding of which is connected through he first wire to two-wire link to the one terminal of the interrupter sensor contact emergency shutdown, and one end of the second

The wires of the two-wire communication line are connected to the second output of the alternating current source, one output of the secondary winding of the first high-frequency transformer is connected to the third input of the control signal generating unit, and the other output is connected to the zero potential bus, the circuit, one of which consists of serially connected make contact the sensor of the gathering of the tape and the second diode turned back on, and the other from the series connected closing contact of the sensor of the control of the fence and the right third diode connected between two wires of a two-wire communication line, characterized in that, in order to expand the functionality by increasing the selective commands, it is equipped with a second high-frequency transformer, fourth, fifth and sixth diodes and sensors of the tape catcher and the maximum condition of the tension drum with the closing and opening contacts, with the series-connected closing contact of the sensor of the catcher of the tape and the reversely connected fourth diode connected between two wires two-wire line and connections, serially connected closing contact of the tension drum limit state sensor and directly connected fifth diode are also connected between two wires of the two-wire communication line, the disconnecting contact of the sensor of the belt catcher is connected to one terminal of the corresponding closing contact of the corresponding sensor and the second wire two-wire communication line, and the other output is directly connected to it, the disconnecting contact of the tension drum limit sensor is connected by one output to the integrated shorting to the contact of the corresponding sensor and the second wire of the two-wire communication line, and the other output through the pulse shaper to the first wire of the two-wire communication link; another output of the first sensing element is connected via a directly connected first diode to another output of the excitation winding of the first high-frequency transformer, the first output AC power source is also connected via a second sensitive element connected in series and the sixth diode back-connected to one terminal of the excitation winding and second high-frequency transformer, the other terminal of which is combined with one end of said first high-frequency transformer, one terminal of the secondary winding of the second transformer is connected to a high-frequency actuating signal ravl, and another - with a bus unit forming a fourth input yn zero potential.

Claims (1)

A conveyor drive locking device containing an AC source, the first output of which is connected to the input of the first sensitive element, one output of which is connected to the first input of the control signal generating unit, the output of which is connected to the executive unit, the second sensitive element, the output of which is connected to the second input of the unit control signal generation, pulse shaper, first diode, first high-frequency transformer, one output of the field winding of which is connected via a the second wire in the two-wire communication line to one terminal of the NC contact of the emergency shutdown sensor, and one end of the second wire of the two-wire communication line is connected to the second terminal of the AC source, one terminal of the secondary winding of the first high-frequency transformer is connected to the third input of the control signal generating unit, and the other terminal - to the bus of zero potential, circuits, one of which consists of a series-connected make contact of the sensor of the vanishing of the tape and the second diode connected back, the other consists of a series-connected make contact of the guard monitoring sensor and a directly connected third diode connected between two wires of a two-wire communication line, characterized in that, in order to expand functionality by increasing selective commands, it is equipped with a second high-frequency transformer, fourth, fifth and the sixth diodes and sensors of the tape catcher and the limit state of the tension drum with make and break contacts, while the closure is connected in series the contact pin of the belt catcher sensor and the fourth diode connected back in between two wires of the two-wire communication line, the make-up terminal of the tension drum limit state sensor and the directly connected fifth diode are also connected between the two wires of the two-wire communication line, the disconnect contact of the tape catcher sensor is connected with one output to the combined make contact of the corresponding sensor and the second wire of the two-wire communication line, and the other output to it directly, the NC contact of the sensor of the limit state of the tension drum is connected by one output to the combined closing contact of the corresponding sensor and the second wire of the two-wire communication line, and by the other output through the pulse shaper - to the first wire of the two-wire communication line, the other output of the first sensitive element is connected through the directly connected first diode to the other the excitation winding of the first high-frequency transformer, the first output of the toxa variable source is also connected via a serial but the second sensing element is connected and the sixth diode is connected back to one terminal of the field winding of the second high-frequency transformer, the other terminal of which is combined with one end of the first high-frequency transformer, one terminal of the secondary winding of the second high-frequency transformer is connected to the fourth input of the control signal generating unit, and the other - with a bus of zero potential.