Device for instantaneously switching standby circuit of electrical control circuit due to fault

Abstract

The utility model relates to a device for instantaneously switching a standby circuit of an electrical control circuit due to a fault. The device comprises a motor main loop and a control loop. The motor main loop comprises a three-phase power supply, a fuse FU, a circuit breaker QF, an alternating current contactor KM1, an alternating current contactor KM2 connected with the KM1 in parallel, a thermal relay FR1 below the KM1 and a thermal relay FR2 connected with the FR1 in parallel, and the motor M is connected with the thermal relay; the control loop comprises a pull rope switch, a stop button SB1, a change-over switch SA, a start button SB2, a pull rope relay KA, a standby start button SB3 and an intermediate relay KA1. When a certain electrical element in the control loop breaks down and the alternating current contactor KM1 in the main loop is disconnected, the contact of the alternating current contactor KM2 in the main loop can be instantly closed, the motor cannot stop, and production continuity is guaranteed.

Description

TECHNICAL FIELD

[0001] The patent application belongs to the technical field of circuit switching device, more particularly, it relates to a device for instantaneously switching standby circuit of electrical control circuit due to fault. BACKGROUND

[0002] The mill is the main equipment of the ore dressing plant, which plays a role in crushing the ore transported to the mill by the steel ball, steel segment and other grinding medium. With the increasingly strict equipment management and the arrangement of production line platform, the smooth running of the mill is very important, and the mill must be ensured to supply ore smoothly. The conventional line control is achieved by controlling the coil of the AC contactor, and the main contact of the AC contactor is closed to run the motor. However, when a fault occurs, the on-site maintenance takes a long time, the running curve of the mill on the production line platform fluctuates greatly, and at the same time, the mill is caused to run empty, and the power consumption is increased. If the standby line is adopted, even if the line is switched in time when a fault occurs, it is still unable to achieve smooth connection, resulting in the fluctuation of the running curve of the mill. CONTENT OF THE UTILITY MODEL

[0003] The utility model aims at the drawbacks of the prior art, and provides a device for instantaneously switching standby circuit of electrical control circuit due to fault, so as to achieve the effect of smooth connection of line conversion, reduce the empty running of equipment and ensure the stability of the running curve of the mill.

[0004] In order to solve the above problems, the utility model adopts the technical scheme of:

[0005] A device for instantaneously switching standby circuit of electrical control circuit due to fault, comprising a motor main circuit and a control circuit.

[0006] The motor main circuit comprises a three-phase power supply, a fuse FU, a circuit breaker QF, an AC contactor KM1, an AC contactor KM2, a thermal relay FR1, a thermal relay FR2 and a motor. The fuse FU, the circuit breaker QF, the AC contactor KM1 and the thermal relay FR1 are connected in series between the three-phase power supply and the motor. The AC contactor KM2 is connected in parallel with the AC contactor KM1. The thermal relay FR2 is connected in parallel with the thermal relay FR1.

[0007] The control circuit comprises a pull cord switch, a stop button SB1, a switch SA, a start button SB2, a pull cord relay KA, a standby start button SB3 and an intermediate relay KA1.

[0008] The pull cord switch, the stop button SB1, the switch SA, the start button SB2, the coil of the AC contactor KM1 and the normally closed contact of the thermal relay FR1 are connected in series. The normally open contact of the AC contactor KM1 is connected in parallel with the start button SB2. The stop button SB1, the switch SA, the start button SB2, the coil of the AC contactor KM1 and the thermal relay FR1 form a branch, and the coil of the pull cord relay KA is connected in parallel with the branch.

[0009] The standby starting button, the stop button SB1, the pull cord relay KA normally open contact, the intermediate relay KA1 coil, the thermal relay FR2 normally closed contact are connected in series, and the AC contactor KM1 normally open contact and the intermediate relay KA1 normally open contact are connected in parallel with the standby starting button;

[0010] The intermediate relay KA1 normally open contact, the AC contactor KM1 normally closed contact and the AC contactor KM2 coil are connected in series, and the fault indication lamp is connected in parallel with the AC contactor KM2 coil.

[0011] Further, the pull cord switch is a bidirectional pull cord switch.

[0012] Further, the fault indication lamp is an LED lamp.

[0013] Further, the change-over switch SA is an explosion-proof change-over switch.

[0014] Thanks to the above technical scheme, the utility model has the beneficial effects of:

[0015] The normally closed contact of the AC contactor KM1 is used as the trigger switch of the standby AC contactor KM2, when the motor normally operates, the coil of the AC contactor KM1 is powered, and the normally closed contact is disconnected, when the coil of the AC contactor KM1 loses power due to a fault, the normally closed contact of the AC contactor KM1 resets, the coil of the standby AC contactor KM2 is powered instantaneously, and the main circuit is switched successfully.

[0016] The device has simple structure, low manufacturing cost, easy replacement of parts, improved operation efficiency of the mill, reduced idle running rate, reduced power consumption, saved spare part cost, reduced maintenance cost, ensured smooth operation curve of the mill on the production line, and considerable benefits. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a motor main circuit diagram of the device.

[0018] Figure 2 It is a control circuit diagram of the device.

[0019] Wherein: 1, three-phase power supply, 2, fuse FU, 3, circuit breaker QF, 4, AC contactor KM1, 5, AC contactor KM2, 6, thermal relay FR1, 7, thermal relay FR2, 8, motor, 9, pull cord switch, 10, stop button SB1, 11, change-over switch SA, 12, starting button SB2, 13, pull cord relay KA, 14, standby starting button SB3, 15, intermediate relay KA1, 16, fault indication lamp. DETAILED DESCRIPTION

[0020] The utility model will be further explained in detail in connection with the embodiments below.

[0021] The utility model provides a device that electrical control circuit instantaneous switching standby line for failure, the utility model discloses a magnetite concentrator ball mill running process, the upper mine belt control circuit is easy to break down and thus stops the mine supply, causes the problem that the ball mill cannot run smoothly, provide a device that electrical control circuit instantaneous switching standby line for failure, the device can be instantaneous switching to standby line for line failure, improve the running efficiency of mill, less air running rate, reduce the loss of power consumption.

[0022] Referring to Figure 1 , three-phase power supply (L1, L2, L3) 1, fuse FU 2, circuit breaker QF 3, AC contactor KM1 4, AC contactor KM2 5, thermal relay FR1 6, thermal relay FR2 7, motor 8, fuse FU 2, circuit breaker QF 3, AC contactor KM1 4, thermal relay FR1 6 are connected in series between three-phase power supply 1 and motor 8, AC contactor KM2 5 is connected in parallel with the AC contactor KM1 4, and thermal relay FR2 7 is connected in parallel with thermal relay FR1 6;Fuse FU 2 can be a drop-out fuse or other style fuse.

[0023] Referring to Figure 2 , the pull cord switch 9, the stop button SB1 10, the change-over switch SA 11, the start button SB2 12, the AC contactor KM1 4 coil, the thermal relay FR1 6 normally closed contact are connected in series, the AC contactor KM1 4 normally open contact is connected in parallel with the start button SB2 12, and the pull cord relay KA 13 coil is connected in parallel with the stop button SB1 10, the change-over switch SA 11, the start button SB2 12, the AC contactor KM1 4 coil and the thermal relay FR1 6;The standby start button SB3 14, the stop button SB1 10, the pull cord relay KA 13 normally open contact, the intermediate relay KA1 15 coil, the thermal relay FR2 7 normally closed contact are connected in series, the AC contactor KM1 4 normally open contact and the intermediate relay KA1 15 normally open contact are connected in parallel with the standby start button SB3 14;The intermediate relay KA1 15 normally open contact, the AC contactor KM1 4 normally closed contact and the AC contactor KM2 5 coil are connected in series, and the fault indicator 16 is connected in parallel with the AC contactor KM2 5 coil.

[0024] In the selection aspect, the pull cord switch 9 can be a bidirectional pull cord switch, the fault indicator 16 is an LED lamp, the change-over switch SA 11 is an explosion-proof change-over switch, or other models. The AC contactor KM2 and KM1 adopt the same model, to ensure that the motor 8 normally and safely runs when switching to the AC contactor KM2.

[0025] The utility model has the following advantages:

[0026] Only the original line is reformed to complete the control requirement, which is simple and convenient. When the mine belt is out of order due to the electrical line fault, the standby line can be automatically switched, and the motor will not stop.

[0027] The specific operation process of the utility model is as follows:

[0028] When starting (at this time, the pull rope switch 9 and the pull rope relay KA 13 need to be in the reset state):

[0029] 1, close the circuit breaker QF 3;

[0030] 2, press the start button SB2 12, the coil of the AC contactor KM1 4 is powered, the main contact is closed, the motor 8 is connected to the three-phase power supply 1 and runs, the auxiliary normally open contact KM1 is closed, forming a line self-locking, the purpose is to ensure that the coil KM1 is continuously powered, and the motor 8 continuously runs, if the normally open contact is not added, the motor is in a point state. The auxiliary normally closed contact KM1 is disconnected, which is interlocked with the coil of the AC contactor KM2, so that the coil of the AC contactor KM2 5 cannot be powered, and the two AC contactors (KM1, KM2) are interlocked to prevent the coil of the AC contactor KM1 and the coil of the AC contactor KM2 from being powered at the same time, causing the motor to burn out. The coil of the pull rope relay KA 13 is powered, the auxiliary normally open contact of the pull rope relay KA 13 is closed, the coil of the intermediate relay KA1 15 is powered, and the auxiliary normally open contact KA1 is closed, forming a self-locking, and the coil of the intermediate relay KA1 15 is continuously powered.

[0031] When a fault occurs:

[0032] When the AC contactor KM1 4 and the thermal relay FR2 6 are damaged, the coil of the AC contactor KM1 4 loses power instantaneously, the auxiliary normally closed contact KM1 is reset, the coil of the AC contactor KM2 5 is powered instantaneously, the main contact is closed, and the motor 8 continues to run.

[0033] When stopping:

[0034] Press the stop button SB1 10, the coil of the AC contactor KM1 4 or the coil of the AC contactor KM2 5 loses power, and the corresponding main contact is disconnected, and the motor 8 stops running.

[0035] The standby start button SB3 14 is used when the start button SB2 12 cannot normally start, and the process is: press the standby start button SB3 14, because the pull rope relay KA 13 coil is in the power-on state, its corresponding auxiliary normally open contact KA is closed, the intermediate relay coil KA1 15 is powered on, the corresponding auxiliary normally open contact KA1 is closed, the AC contactor KM2 coil is powered on, the main contact is closed, and the motor main circuit uses the standby line to run; At the same time, the fault lamp is on, prompting that the motor 8 is running using the standby line.

Claims

1. An apparatus for instantaneously switching a standby line in case of failure of an electric control line, characterized by: The motor main circuit and the control circuit are included. The motor main circuit includes a three-phase power supply, a fuse FU, a circuit breaker QF, an AC contactor KM1, an AC contactor KM2, a thermal relay FR1, a thermal relay FR2 and a motor. The fuse FU, the circuit breaker QF, the AC contactor KM1 and the thermal relay FR1 are connected in series between the three-phase power supply and the motor. The AC contactor KM2 is connected in parallel with the AC contactor KM1. The thermal relay FR2 is connected in parallel with the thermal relay FR1. The control circuit includes a pull cord switch, a stop button SB1, a change-over switch SA, a start button SB2, a pull cord relay KA, a standby start button SB3 and an intermediate relay KA1. The pull cord switch, the stop button SB1, the change-over switch SA, the start button SB2, the coil of the AC contactor KM1 and the normally closed contact of the thermal relay FR1 are connected in series. The normally open contact of the AC contactor KM1 is connected in parallel with the start button SB2. The stop button SB1, the change-over switch SA, the start button SB2, the coil of the AC contactor KM1 and the thermal relay FR1 are connected in parallel with the coil of the pull cord relay KA. The standby start button, the stop button SB1, the normally open contact of the pull cord relay KA, the coil of the intermediate relay KA1 and the normally closed contact of the thermal relay FR2 are connected in series. The normally open contact of the AC contactor KM1 and the normally open contact of the intermediate relay KA1 are connected in parallel with the standby start button. The normally open contact of the intermediate relay KA1, the normally closed contact of the AC contactor KM1 and the coil of the AC contactor KM2 are connected in series. The fault indicator lamp is connected in parallel with the coil of the AC contactor KM2.

2. A device for the instantaneous switching of a standby line in the event of a fault in an electrical control line, according to claim 1, characterized in that: The pull cord switch is a bidirectional pull cord switch.

3. A device for the instantaneous switching of a standby line in the event of a fault in an electrical control line according to claim 2, characterized in that: The fault indicator lamp is an LED lamp.

4. A device for instantaneous switching of a standby line in case of failure of an electric control line according to claim 2, characterized in that: The change-over switch SA is an explosion-proof change-over switch.

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