CN219458929U - Motor forward and backward rotation control circuit capable of preventing flashover - Google Patents
Motor forward and backward rotation control circuit capable of preventing flashover Download PDFInfo
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- CN219458929U CN219458929U CN202320742273.8U CN202320742273U CN219458929U CN 219458929 U CN219458929 U CN 219458929U CN 202320742273 U CN202320742273 U CN 202320742273U CN 219458929 U CN219458929 U CN 219458929U
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Abstract
The utility model discloses a motor forward and backward rotation control circuit for preventing flashover, which comprises a time relay KT; the auxiliary normally-open contact of the first contactor KM1, the auxiliary normally-closed contact of the second contactor KM2 and the coil of the first contactor KM1 are connected in series to form a first control circuit; the auxiliary normally-open contact of the second contactor KM2, the auxiliary normally-closed contact of the first contactor KM1 and the coil of the second contactor KM2 are connected in series to form a second control circuit; the other auxiliary normally open contact of the first contactor KM1 and the other auxiliary normally open contact of the second contactor KM2 are connected in parallel and then connected in series with a coil of the time relay KT to form a third control circuit. The advantages are that: according to the on-site actual production demand, through setting for time relay KT's time, realize just can switch over the turning to of motor in the time frame that established, guarantee that electric arc extinguishes in this time frame, guarantee can effectively break off the main loop, avoid the potential safety hazard, guarantee normal production.
Description
Technical field:
the utility model relates to the technical field of motor control, in particular to a motor forward and reverse rotation control circuit for preventing flashover.
The background technology is as follows:
in the production process of a coal washery, the scraper machine is usually required to be switched to operate in the forward and reverse directions, the operation is more frequent when the scraper machine is required to be switched to turn, and the main loop cannot be disconnected in time due to the fact that the contactor generates electric arcs or is stuck, so that the tripping and the power losing of the main power switch are caused in the switching and turning process, potential safety hazards exist, and normal production is affected.
The utility model comprises the following steps:
the utility model aims to provide a motor forward and reverse rotation control circuit capable of ensuring safe steering switching and preventing flashover.
The utility model is implemented by the following technical scheme: the motor forward and backward rotation control circuit for preventing flashover comprises a first contactor KM1, a second contactor KM2, a time relay KT, a power switch QF1, a stop button SB1, a forward rotation start button SB2 and a backward rotation start button SB3; an auxiliary normally-open contact of the first contactor KM1, an auxiliary normally-closed contact of the second contactor KM2 and a coil of the first contactor KM1 are connected in series to form a first control circuit, and after being connected in series, the forward rotation starting button SB2 and a power-off delay closing contact of the time relay KT are connected in parallel with an auxiliary normally-open contact of the first contactor KM 1; the auxiliary normally-open contact of the second contactor KM2, the auxiliary normally-closed contact of the first contactor KM1 and the coil of the second contactor KM2 are connected in series to form a second control circuit, and the reverse start button SB3 and the other power-off delay closed contact of the time relay KT are connected in series and then connected in parallel with the auxiliary normally-open contact of the second contactor KM 2; the other auxiliary normally open contact of the first contactor KM1 and the other auxiliary normally open contact of the second contactor KM2 are connected in parallel and then connected in series with a coil of the time relay KT to form a third control circuit; the first control circuit, the second control circuit and the third control circuit are connected in parallel and then connected in series with the power switch QF1 and the stop button SB1 to form a closed loop.
Further, an auxiliary normally-closed contact of a thermal relay FR is connected in series with the stop button SB 1.
The utility model has the advantages that: according to the utility model, according to the actual production requirement on site, the steering of the motor can be switched within a set time range by setting the time of the time relay KT, the arc is extinguished within the time range, the main loop can be effectively disconnected, the potential safety hazard is avoided, and the normal production is ensured.
Description of the drawings:
fig. 1 is a circuit diagram of the present utility model.
Fig. 2 is a circuit diagram of a main loop according to the present utility model.
The components in the drawings are marked as follows: the main circuit 1, the main power switch QF, the thermal relay FR, the first contactor KM1, the second contactor KM2, the time relay KT, the power switch QF1, the stop button SB1, the forward rotation start button SB2, the reverse rotation start button SB3, the first control circuit 2, the second control circuit 3 and the third control circuit 4.
The specific embodiment is as follows:
the following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1 and 2, the present embodiment provides a motor forward and reverse rotation control circuit for preventing arcing, which includes a first contactor KM1, a second contactor KM2, a time relay KT, a power switch QF1, a stop button SB1, a forward rotation start button SB2, and a reverse rotation start button SB3; the main loop 1 controlled by the utility model is of an existing structure and comprises a main power switch QF, a thermal relay FR, a main contact of a first contactor KM1, a main contact of a second contactor KM2 which are connected in parallel, and a driving motor of a scraper.
An auxiliary normally-open contact of the first contactor KM1, an auxiliary normally-closed contact of the second contactor KM2 and a coil of the first contactor KM1 are connected in series to form a first control circuit 2, and after a forward rotation starting button SB2 and a power-off delay closed contact of a time relay KT are connected in series, the first control circuit is connected in parallel with the auxiliary normally-open contact of the first contactor KM 1; an auxiliary normally-open contact of the second contactor KM2, an auxiliary normally-closed contact of the first contactor KM1 and a coil of the second contactor KM2 are connected in series to form a second control circuit 3, and after the reverse start button SB3 and the other power-off delay closed contact of the time relay KT are connected in series, the reverse start button SB3 and the other power-off delay closed contact of the time relay KT are connected in parallel with the auxiliary normally-open contact of the second contactor KM 2; the other auxiliary normally open contact of the first contactor KM1 and the other auxiliary normally open contact of the second contactor KM2 are connected in parallel and then connected in series with a coil of a time relay KT to form a third control circuit 4; the first control circuit 2, the second control circuit 3 and the third control circuit 4 are connected in parallel and then connected in series with the power switch QF1 and the auxiliary normally-closed contact of the thermal relay FR and the stop button SB1 to form a closed loop.
When the utility model works, the main power switch QF and the power switch QF1 are closed, the forward rotation starting button SB2 is pressed, the coil of the first contactor KM1 is electrified, one auxiliary normally open contact of the first contactor KM1 is closed and self-locked, meanwhile, the main contact of the first contactor KM1 on the main loop 1 is closed, the motor starts to rotate forward, meanwhile, the auxiliary normally closed contact of the first contactor KM1 on the second control circuit 3 is opened, the other auxiliary normally open contact of the first contactor KM1 on the third control circuit 4 is closed, the coil of the time relay KT is electrified, and the power-off delay closed contact of the time relay KT is in an open state.
When the motor is required to stop, the stop button SB1 is pressed, the coil of the first contactor KM1 is powered off, and the motor stops rotating positively; at the moment, the auxiliary normally-closed contact of the first contactor KM1 is closed, the auxiliary normally-open contact of the first contactor KM1 is opened, the coil of the time relay KT is powered off, and timing is started; at this time, even if the reverse rotation start button SB3 is pressed, the coil of the second contactor KM2 is not powered on and the motor cannot start the reverse rotation because the power-off delay closing contact of the time relay KT on the second control line 3 is in the open state.
When the timing time of the time relay KT reaches the set time, the power-off time-delay closed contact of the time relay KT is closed, at the moment, the reverse start button SB3 is pressed, the coil of the second contactor KM2 can be powered on, the auxiliary normally open contact of the second contactor KM2 on the second control circuit 3 is closed and self-locked, the main contact of the second contactor KM2 on the main circuit 1 is closed, the motor starts to reversely run, meanwhile, the auxiliary normally closed contact of the second contactor KM2 on the first control circuit 2 is opened, the auxiliary normally open contact of the second contactor KM2 on the third control circuit 4 is closed, the coil of the time relay KT is powered on, and the power-off time-delay closed contact of the time relay KT is opened.
When the motor is required to stop, the stop button SB1 is pressed, the coil of the second contactor KM2 is powered off, and the motor stops reversing operation; at the moment, the auxiliary normally-closed contact of the second contactor KM2 is closed, the auxiliary normally-open contact of the second contactor KM2 is opened, the coil of the time relay KT is powered off, and timing is started; at this time, even if the forward rotation start button SB2 is pressed, the coil of the first contactor KM1 is not powered on and the motor cannot start forward rotation because the power-off delay closing contact of the time relay KT on the first control line 2 is in an open state.
Therefore, according to the on-site actual production requirement, the utility model realizes that the steering of the motor can be switched within a set time range by setting the time of the time relay KT, ensures that the electric arc is extinguished within the time range, ensures that the main loop 1 can be effectively disconnected, avoids potential safety hazards and ensures normal production.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (2)
1. The motor forward and backward rotation control circuit capable of preventing flashover is characterized by comprising a first contactor KM1, a second contactor KM2, a time relay KT, a power switch QF1, a stop button SB1, a forward rotation start button SB2 and a backward rotation start button SB3;
an auxiliary normally-open contact of the first contactor KM1, an auxiliary normally-closed contact of the second contactor KM2 and a coil of the first contactor KM1 are connected in series to form a first control circuit, and after being connected in series, the forward rotation starting button SB2 and a power-off delay closing contact of the time relay KT are connected in parallel with an auxiliary normally-open contact of the first contactor KM 1;
the auxiliary normally-open contact of the second contactor KM2, the auxiliary normally-closed contact of the first contactor KM1 and the coil of the second contactor KM2 are connected in series to form a second control circuit, and the reverse start button SB3 and the other power-off delay closed contact of the time relay KT are connected in series and then connected in parallel with the auxiliary normally-open contact of the second contactor KM 2;
the other auxiliary normally open contact of the first contactor KM1 and the other auxiliary normally open contact of the second contactor KM2 are connected in parallel and then connected in series with a coil of the time relay KT to form a third control circuit;
the first control circuit, the second control circuit and the third control circuit are connected in parallel and then connected in series with the power switch QF1 and the stop button SB1 to form a closed loop.
2. The motor forward and reverse rotation control circuit for preventing arcing according to claim 1, wherein an auxiliary normally-closed contact of a thermal relay FR is connected in series with the stop button SB 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320742273.8U CN219458929U (en) | 2023-04-06 | 2023-04-06 | Motor forward and backward rotation control circuit capable of preventing flashover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320742273.8U CN219458929U (en) | 2023-04-06 | 2023-04-06 | Motor forward and backward rotation control circuit capable of preventing flashover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219458929U true CN219458929U (en) | 2023-08-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320742273.8U Active CN219458929U (en) | 2023-04-06 | 2023-04-06 | Motor forward and backward rotation control circuit capable of preventing flashover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219458929U (en) |
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2023
- 2023-04-06 CN CN202320742273.8U patent/CN219458929U/en active Active
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