Mine fan on-site and remote control loop with air reversing function

Abstract

The utility model mainly relates to the technical field of mine ventilation equipment. According to the mine fan local and remote control loop with the reverse ventilation function, the intermediate relay circuit is arranged, and forward rotation or reverse rotation operation control can be conducted on an axial flow fan through a local button and a remote end PLC module; the utility model discloses an axial flow fan switching device, and aims to solve the problems that a mine system switches local and remote axial flow fans through a parameter group by switching a frequency converter, and when the frequency converter reports errors due to overcurrent, overvoltage, overheating and the like, switching failure, incapability of starting the axial flow fans remotely or disorder of air ducts caused by simultaneous operation of positive and negative air of adjacent axial flow fans is possibly caused, and equipment is easily damaged.

Description

Technical Field

[0001] The utility model mainly relates to the technical field of mine ventilation equipment, in particular to an on-site and remote control circuit of a mine fan with a reverse wind function. Background Art

[0002] The stable operation of the mine ventilation system is an important guarantee for underground production. Axial flow fans, as equipment for ventilation with underground airflow, are used to exchange fresh air, dilute and extract suffocating, harmful gases and dust, which is of great significance to the health and safety of underground personnel. The variable frequency motor automatic control mode of axial flow fans usually uses inverter terminal wiring for local operation and communication with PLC directly by adding a communication board for remote operation. The local / remote switching is performed by switching the command source through the inverter parameter group. This control mode may cause switching failure, axial flow fan remote startup failure, or adjacent axial flow fans running simultaneously due to positive and negative winds, causing air duct disorder, resulting in equipment damage and affecting normal underground production. Utility Model Content

[0003] Technical problems to be solved by the utility model

[0004] A local and remote control circuit for mine fans with reverse wind function is provided to solve the problem that the mine system switches the local and remote axial flow fans through the parameter group by switching the inverter. When the inverter reports errors due to overcurrent, overvoltage, overheating, etc., it may cause switching failure, the axial flow fan cannot be started remotely, or the adjacent axial flow fans run in positive and reverse wind at the same time, causing disorder in the air duct, which may easily cause equipment damage.

[0005] The utility model solves the above-mentioned problems by adopting the technical solution

[0006] A local and remote control circuit for a mine fan with a reverse wind function, comprising a frequency converter, a PLC module, and a relay expansion circuit, wherein the relay expansion circuit comprises a conversion switch, a first operation button, a second operation button, a third operation button, a reset button, and a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay, an eighth relay, a ninth relay, a tenth relay, an eleventh relay, and a twelfth relay; the first relay and the second relay comprise at least three groups of normally open auxiliary contacts, the third relay comprises at least one group of normally open auxiliary contacts and one group of normally closed auxiliary contacts, the fourth to tenth relays and the twelfth relay comprise at least one group of normally open auxiliary contacts, the eleventh relay comprises at least one group of normally closed auxiliary contacts, and the conversion switch comprises at least six pairs of contacts;

[0007] The inverter is connected to the axial flow fan. The inverter input terminal: the normally closed auxiliary contact of the third relay is connected to the local / remote selection command input terminal of the inverter, the first group of normally open auxiliary contacts of the first relay is connected to the forward command input terminal of the axial flow fan of the inverter, the first group of normally open auxiliary contacts of the second relay is connected to the reverse command input terminal of the axial flow fan of the inverter, the normally open auxiliary contact of the twelfth relay is connected to the reset command input terminal of the axial flow fan of the inverter, and the reset button is connected to one end of the normally open auxiliary contact of the twelfth relay; the inverter output terminal: the coil of the seventh relay is connected to the axial flow fan operation signal output terminal of the inverter, and the coil of the eighth relay is connected to the axial flow fan fault signal output terminal of the inverter;

[0008] The first relay coil is connected to one end of the sixth relay coil, the first relay coil and the fifth relay coil are connected in parallel, the second relay coil and the sixth relay coil are connected in parallel, the first pair of contacts of the transfer switch are connected in series with the first relay coil, the second pair of contacts are connected in series with the fifth relay coil, the third pair of contacts are connected in series with the second relay coil, the fourth pair of contacts are connected in series with the sixth relay coil, the fifth pair of contacts are left empty, and the sixth pair of contacts are connected in series with the third relay coil; one end of the first operating button, one end of the second and third groups of normally open auxiliary contacts of the first relay are connected to one end of the normally open auxiliary contacts of the ninth relay, one end of the second operating button, one end of the second and third groups of normally open auxiliary contacts of the second relay are connected to one end of the normally open auxiliary contacts of the tenth relay; the third operating button and the normally closed auxiliary contacts of the eleventh relay are connected in series with the normally closed auxiliary contacts of the eighth relay, and the other end of the normally closed auxiliary contacts of the eighth relay, the other end of the sixth pair of contacts of the transfer switch and the other end of the coil of the fourth relay are connected to the phase line;

[0009] The normally open auxiliary contact of the third relay is connected to the remote signal input terminal of the axial fan selection of the PLC module, the normally open auxiliary contact of the fourth relay is connected to the inverter power signal input terminal of the PLC module, the seventh relay is connected to the axial fan operation signal output terminal of the PLC module, and one end of the normally open auxiliary contact of the eighth relay is connected to the axial fan fault signal input terminal of the PLC module; the coil of the ninth relay is connected to the forward signal output terminal of the axial fan of the PLC module, the coil of the tenth relay is connected to the reverse signal output terminal of the axial fan of the PLC module, the coil of the eleventh relay is connected to the stop signal output terminal of the axial fan of the PLC module, and the coil of the twelfth relay is connected to the reset signal output terminal of the axial fan of the PLC module.

[0010] Further, the first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, the seventh relay, the eighth relay, the ninth relay, the tenth relay, the eleventh relay and the twelfth relay are arranged on the same control board.

[0011] Furthermore, the control panel is arranged inside a cabinet where the frequency converter is installed.

[0012] Furthermore, the relays in the relay expansion circuit are arranged in 4 rows and 3 columns on the control board, the first row from left to right includes the first relay, the second relay and the third relay, the second row from left to right includes the fourth relay, the fifth relay and the sixth relay, the third row from left to right includes the seventh relay, the eighth relay and the ninth relay, and the fourth row from left to right includes the tenth relay, the eleventh relay and the twelfth relay; the coil voltage of the relays in the first and second rows is AC220V, and the coil voltage of the relays in the third and fourth rows is DC24V.

[0013] Beneficial effects of the utility model

[0014] The utility model is provided with a relay expansion circuit, which can remotely control the axial flow fan for reverse wind test on the basis of local control of the axial flow fan without installing a communication board, and no maintenance electrician is needed to reverse the phase of the motor, which is convenient to operate and can reliably protect the axial flow fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing the arrangement of relays on a control panel in the utility model;

[0016] Figure 2 It is the wiring diagram of the frequency converter and relay expansion circuit in the utility model;

[0017] Figure 3 This is the internal wiring diagram of the relay expansion circuit of the utility model;

[0018] Figure 4 This is the wiring diagram of the PLC module and the relay expansion circuit;

[0019] Figure markings: first relay - KA1, second relay - KA2, third relay - KA3, fourth relay - KA4, fifth relay - KA5, sixth relay - KA6, seventh relay - KA7, eighth relay - KA8, ninth relay - KA9, tenth relay - KA10, eleventh relay - KA11, twelfth relay - KA12, axial flow fan - M1, air switch - QF, first operating button - SB1, second operating button - SB2, third operating button - SB3, reset button - SB4, switching switch - SA, neutral line - N, phase line - L1. DETAILED DESCRIPTION

[0020] To optimize wiring, facilitate installation and maintenance, such as Figure 1As shown, the relays in the relay expansion circuit are arranged in 4 rows and 3 columns on the control board. The first row is composed of the first relay KA1, the second relay KA2 and the third relay KA3 from left to right, the second row is composed of the fourth relay KA4, the fifth relay KA5 and the sixth relay KA6 from left to right, the third row is composed of the seventh relay KA7, the eighth relay KA8 and the ninth relay KA9 from left to right, and the fourth row is composed of the tenth relay KA10, the eleventh relay KA11 and the twelfth relay KA12 from left to right; input and output terminals are installed on the left and right sides of the control board respectively to separate different voltage levels.

[0021] The first relay KA1 and the second relay KA2 include at least three groups of normally open auxiliary contacts, the third relay KA3 includes at least one group of normally open auxiliary contacts and one group of normally closed auxiliary contacts, the fourth relay KA4 to the tenth relay KA10, and the twelfth relay KA12 include at least one group of normally open auxiliary contacts, and the eleventh relay KA11 includes at least one group of normally closed auxiliary contacts.

[0022] The frequency converter is connected to the reactor, the axial flow fan M1, and the air switch QF. The PLC module is connected to the switch and the remote control station through the network, and the remote control of the axial flow fan M1 is realized through the remote control station.

[0023] like Figure 2 As shown, the normally closed auxiliary contact of the third relay KA3 is connected to the local / remote selection command input terminal of the inverter, the first group of normally open auxiliary contacts of the first relay KA1 is connected to the forward command input terminal of the axial flow fan of the inverter, the first group of normally open auxiliary contacts of the second relay KA2 is connected to the reverse command input terminal of the axial flow fan of the inverter, one end of the normally open auxiliary contact of the twelfth relay KA12 is connected to the reset command input terminal of the axial flow fan of the inverter, the other end of the normally closed auxiliary contact of the third relay KA3, the other end of the first group of normally open auxiliary contacts of the first relay KA1, the other end of the first group of normally open auxiliary contacts of the second relay KA2 and the other end of the normally open auxiliary contact of the twelfth relay KA12 are connected to the input common terminal, and the reset button SB4 is connected to one end of the normally open auxiliary contact of the twelfth relay KA12; one end of the coil of the seventh relay KA7 is connected to the axial flow fan operation signal output terminal of the inverter, and one end of the coil of the eighth relay KA8 is connected to the axial flow fan fault signal output terminal of the inverter; the other ends of the coils of the seventh relay KA7 and the eighth relay KA8 are connected to the output common terminal.

[0024] like Figure 3As shown, one end of the coils of the first to sixth relays KA1 to KA6 is connected to the neutral line N, the coil of the first relay KA1 and the coil of the fifth relay KA5 are connected in parallel, the coil of the second relay KA2 and the coil of the sixth relay KA6 are connected in parallel, the first pair of contacts 1-2, the second pair of contacts 3-4, the third pair of contacts 5-6 and the fourth pair of contacts 7-8 of the conversion switch SA are connected in series in sequence to the loops of the first relay KA1 coil, the fifth relay KA5 coil, the second relay KA2 coil and the sixth relay KA6 coil, the fifth pair of contacts 9-10 of the conversion switch SA is left empty, and the sixth pair of contacts 11-12 is connected in series to the coil of the third relay KA3; the first operating One end of the operating button SB1 and one end of the second and third groups of normally open auxiliary contacts of the first relay KA1 are connected to one end of the normally open auxiliary contact of the ninth relay KA9, one end of the second operating button SB2 and one end of the second and third groups of normally open auxiliary contacts of the second relay KA2 are connected to one end of the normally open auxiliary contact of the tenth relay KA10; the third operating button SB3, the normally closed auxiliary contact of the eleventh relay KA11 and the normally closed auxiliary contact of the eighth relay KA8 are connected in series, and the other end of the normally closed auxiliary contact of the eighth relay KA8 and the other end of the sixth pair of contacts 11-12 of the transfer switch SA and the other end of the coil of the fourth relay KA4 are connected to the phase line L1.

[0025] like Figure 4 As shown, one end of the normally open auxiliary contact of the third relay KA3 is connected to the remote signal input terminal of the axial flow fan selection of the PLC module, one end of the normally open auxiliary contact of the fourth relay KA4 is connected to the power signal input terminal of the axial flow fan of the PLC module, one end of the normally open auxiliary contact of the seventh relay KA7 is connected to the running signal input terminal of the axial flow fan of the PLC module, one end of the normally open auxiliary contact of the eighth relay KA8 is connected to the fault signal input terminal of the axial flow fan of the PLC module, one end of the normally open auxiliary contact of the fifth relay KA5 is connected to the forward running signal input terminal of the axial flow fan of the PLC module, one end of the normally open auxiliary contact of the sixth relay KA6 is connected to the reverse running signal input terminal of the axial flow fan of the PLC module, and the third relay KA3, the fourth relay KA4, and the seventh relay The other ends of the normally open auxiliary contacts of electrical appliance KA7, the eighth relay KA8, the fifth relay KA5 and the sixth relay KA6 are connected to the input common end; one end of the coil of the ninth relay KA9 is connected to the forward signal output end of the axial flow fan of the PLC module, one end of the coil of the tenth relay KA10 is connected to the reverse signal output end of the axial flow fan of the PLC module, one end of the coil of the eleventh relay KA11 is connected to the stop signal output end of the axial flow fan of the PLC module, one end of the coil of the twelfth relay KA12 is connected to the reset signal output end of the axial flow fan of the PLC module, and the other ends of the coils of the ninth relay KA9, the tenth relay KA10, the eleventh relay KA11 and the twelfth relay KA12 are connected to the output common end.

[0026] When the axial flow fan is operated locally, the conversion switch is thrown to 315 degrees, the first operation button SB1 is pressed, the first relay KA1 is started, the first pair of contacts 1-2 of the conversion switch SA are connected, and the axial flow fan M1 is operated locally in the forward direction. The conversion switch is thrown to 315 degrees, the third operation button SB3 is pressed, the second relay KA2 is started, the third pair of contacts 5-6 of the conversion switch SA are connected, and the axial flow fan M1 is operated locally in the reverse direction.

[0027] The PLC module connects the switch and the remote control station through the network, and remotely controls the axial flow fan M1 through the remote control station. Select the forward rotation of the axial flow fan at the remote control station, switch SA's angle is switched to 45 degrees, the sixth pair of contacts 11-12 of the switch SA is connected, the third relay KA3 is actuated, the second pair of contacts 3-4 is connected, the fifth relay KA5 and the ninth relay KA9 are started, and the axial flow fan M1 starts the forward rotation operation. Select the reverse rotation of the axial flow fan at the remote control station, switch SA's angle is switched to 45 degrees, the sixth pair of contacts 11-12 of the switch SA is connected, the third relay KA3 is actuated, the fourth pair of contacts 7-8 is connected, the sixth relay KA6 and the tenth relay KA10 are started, and the axial flow fan M1 starts the reverse rotation operation.

[0028] When a fault occurs in the axial flow fan M1, the normally closed auxiliary contact of the eighth relay KA8 operates, and the fault is fed back to the PLC module. The eleventh relay KA11 is controlled by the second operation button SB2 to shut down the axial flow fan M1. After the fault is eliminated, it is reset by the reset button SB4 or the twelfth relay KA12.

Claims

1. A local and remote control circuit for a mine fan with reverse wind function, characterized in that: It includes a frequency converter, a PLC module, and a relay expansion circuit. The relay expansion circuit includes a transfer switch, a first operation button, a second operation button, a third operation button, a reset button, and a first relay, a second relay, a third relay, a fourth relay, a fifth relay, a sixth relay, a seventh relay, an eighth relay, a ninth relay, a tenth relay, an eleventh relay, and a twelfth relay. The first relay and the second relay include at least three groups of normally open auxiliary contacts, the third relay includes at least one group of normally open auxiliary contacts and one group of normally closed auxiliary contacts, the fourth to tenth relays and the twelfth relay include at least one group of normally open auxiliary contacts, the eleventh relay includes at least one group of normally closed auxiliary contacts, and the transfer switch includes at least six pairs of contacts. The inverter is connected to the axial flow fan. The inverter input terminal: the normally closed auxiliary contact of the third relay is connected to the local / remote selection command input terminal of the inverter, the first group of normally open auxiliary contacts of the first relay is connected to the forward command input terminal of the axial flow fan of the inverter, the first group of normally open auxiliary contacts of the second relay is connected to the reverse command input terminal of the axial flow fan of the inverter, the normally open auxiliary contact of the twelfth relay is connected to the reset command input terminal of the axial flow fan of the inverter, and the reset button is connected to one end of the normally open auxiliary contact of the twelfth relay; the inverter output terminal: the coil of the seventh relay is connected to the axial flow fan operation signal output terminal of the inverter, and the coil of the eighth relay is connected to the axial flow fan fault signal output terminal of the inverter; The first relay coil is connected to one end of the sixth relay coil, the first relay coil and the fifth relay coil are connected in parallel, the second relay coil and the sixth relay coil are connected in parallel, the first pair of contacts of the transfer switch are connected in series with the first relay coil, the second pair of contacts are connected in series with the fifth relay coil, the third pair of contacts are connected in series with the second relay coil, the fourth pair of contacts are connected in series with the sixth relay coil, the fifth pair of contacts are left empty, and the sixth pair of contacts are connected in series with the third relay coil; one end of the first operating button, one end of the second and third groups of normally open auxiliary contacts of the first relay are connected to one end of the normally open auxiliary contacts of the ninth relay, one end of the second operating button, one end of the second and third groups of normally open auxiliary contacts of the second relay are connected to one end of the normally open auxiliary contacts of the tenth relay; the third operating button and the normally closed auxiliary contacts of the eleventh relay are connected in series with the normally closed auxiliary contacts of the eighth relay, and the other end of the normally closed auxiliary contacts of the eighth relay, the other end of the sixth pair of contacts of the transfer switch and the other end of the coil of the fourth relay are connected to the phase line; The normally open auxiliary contact of the third relay is connected to the remote signal input terminal of the axial fan selection of the PLC module, the normally open auxiliary contact of the fourth relay is connected to the inverter power signal input terminal of the PLC module, the seventh relay is connected to the axial fan operation signal output terminal of the PLC module, and one end of the normally open auxiliary contact of the eighth relay is connected to the axial fan fault signal input terminal of the PLC module; the coil of the ninth relay is connected to the forward signal output terminal of the axial fan of the PLC module, the coil of the tenth relay is connected to the reverse signal output terminal of the axial fan of the PLC module, the coil of the eleventh relay is connected to the stop signal output terminal of the axial fan of the PLC module, and the coil of the twelfth relay is connected to the reset signal output terminal of the axial fan of the PLC module.

2. A mine fan local and remote control circuit with reverse wind function according to claim 1, characterized in that: The first relay, the second relay, the third relay, the fourth relay, the fifth relay, the sixth relay, the seventh relay, the eighth relay, the ninth relay, the tenth relay, the eleventh relay and the twelfth relay are arranged on the same control board.

3. A mine fan local and remote control circuit with reverse wind function according to claim 2, characterized in that: The control panel is arranged inside the cabinet where the frequency converter is installed.

4. A mine fan local and remote control circuit with reverse wind function according to claim 2 or 3, characterized in that: The relays in the relay expansion circuit are arranged in 4 rows and 3 columns on the control board, the first row from left to right includes the first relay, the second relay and the third relay, the second row from left to right includes the fourth relay, the fifth relay and the sixth relay, the third row from left to right includes the seventh relay, the eighth relay and the ninth relay, and the fourth row from left to right includes the tenth relay, the eleventh relay and the twelfth relay; the coil voltage of the relays in the first and second rows is AC220V, and the coil voltage of the relays in the third and fourth rows is DC24V.

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