Control loop of electric actuator for upper and lower gate plates of coal feeder

Abstract

The utility model belongs to the technical field of electric actuator control loops, and particularly relates to a coal feeder upper and lower gate electric actuator control loop, which comprises an electric execution part and a coal feeder control cabinet, the electric execution part is electrically connected with the coal feeder control cabinet, and a control power supply is electrically connected with an upper and lower gate electric actuator through a first circuit breaker. A first output end of the upper and lower flashboard electric actuator is electrically connected with a first button switch and a second button switch, the first button switch is electrically connected with a normally-closed contact of a second contactor, and a normally-closed contact of the second contactor is electrically connected with a normally-closed contact of a first relay. A normally-closed contact of the first relay is electrically connected with a coil of a first contactor. According to the utility model, by improving the electric actuator control loop of the upper and lower gate plates of the coal feeder, the influence of vibration on the electric actuator control loop of the coal feeder can be effectively reduced, so that the overall reliability and stability of equipment are improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to electric actuator control loop technical field, concretely relates to a coal feeder upper and lower gate electric actuator control loop. BACKGROUND

[0002] The coal feeder is important auxiliary equipment of the thermal power plant, and the existing coal feeder upper and lower gate electric actuator often appears oscillation phenomenon in the running process, which not only influences its service life, but also can lead to magnetic amplifier failure. The reasons of vibration include that the insensitive area of magnetic amplifier is too small, the actuating mechanism loses brake, signal source fluctuation, the parameter setting of regulating system is improper, the flow characteristics of valve are steep, and the play and gap of actuating mechanism and valve connecting piece are too large. And due to long-term vibration, the components such as potentiometer and feedback system in electric actuator are easy to be damaged, which leads to the decline of control precision. For example, in the differential transformer type feedback system, vibration can make the transformer core run unstably, generate displacement and increase feedback signal error; the potentiometer type feedback system can appear feedback signal jumping disorder due to poor contact. CONTENT OF UTILITY MODEL

[0003] In view of the above-mentioned technical problem that the existing coal feeder upper and lower gate electric actuator is long-term oscillation and influences normal operation of the unit, the utility model provides a coal feeder upper and lower gate electric actuator control loop, which effectively avoids the influence of vibration on components and effectively improves equipment reliability.

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

[0005] A coal feeder upper and lower gate electric actuator control loop, including electric actuator part and coal feeder control cabinet, electric actuator part and coal feeder control cabinet electric connection, the coal feeder control cabinet includes control power supply, first circuit breaker, upper and lower gate electric actuator, first button switch, second button switch, first contactor, second contactor, first relay, second relay, control power supply passes through first circuit breaker and is electrically connected with upper and lower gate electric actuator, the first output end of upper and lower gate electric actuator is electrically connected with first button switch and second button switch respectively, the normally closed contact of second contactor is electrically connected with first button switch, the normally closed contact of second contactor is electrically connected with the normally closed contact of first relay, the coil of first contactor is electrically connected with the normally closed contact of first relay, the normally closed contact of first contactor is electrically connected with the normally closed contact of second relay, the normally closed contact of second relay is electrically connected with the coil of second contactor.

[0006] The coal feeder control cabinet further comprises a first auxiliary switch and a second auxiliary switch, the normally closed contact of the second contactor and the normally closed contact of the first relay are electrically connected with the first auxiliary switch, and the normally closed contact of the first contactor and the normally closed contact of the second relay are electrically connected with the second auxiliary switch.

[0007] The coal feeder control cabinet further comprises a DCS opening instruction and a DCS closing instruction, the second output end of the up-down gate electric actuator is electrically connected with the DCS opening instruction and the DCS closing instruction respectively, the DCS opening instruction is electrically connected with the normally closed contact of the second contactor, and the DCS closing instruction is electrically connected with the normally closed contact of the first contactor.

[0008] The DCS opening instruction is connected in parallel with the first normally open contact of the first contactor, and the DCS closing instruction is connected in parallel with the first normally open contact of the second contactor.

[0009] The coal feeder control cabinet further comprises a valve opening feedback, a valve closing feedback, a first indicator lamp and a second indicator lamp, the control power supply is electrically connected with the valve opening feedback and the valve closing feedback through the first circuit breaker respectively, the valve opening feedback is electrically connected with the coil of the first relay, and the valve closing feedback is electrically connected with the coil of the second relay.

[0010] The control power supply is electrically connected with the normally open contact of the first relay and the normally open contact of the second relay through the first circuit breaker respectively, the normally open contact of the first relay is electrically connected with the first indicator lamp, and the normally open contact of the second relay is electrically connected with the second indicator lamp.

[0011] The electric actuator part comprises a 380V three-phase alternating current power supply, a first live wire, a second live wire and a third live wire, the first live wire, the second live wire and the third live wire are electrically connected on the 380V three-phase alternating current power supply, the first live wire, the second live wire and the third live wire are electrically connected with the U terminal, the V terminal and the W terminal of the motor through the second normally open contact of the first contactor respectively, and the first live wire, the second live wire and the third live wire are electrically connected with the W terminal, the V terminal and the U terminal of the motor through the second normally open contact of the second contactor respectively.

[0012] The second normally open contact of the first contactor and the second normally open contact of the second contactor are electrically connected with the motor through the thermal relay.

[0013] The first live wire, the second live wire and the third live wire are electrically connected with the 380V three-phase alternating current power supply through the second circuit breaker.

[0014] Compared with the prior art, the utility model has the beneficial effect that:

[0015] The utility model discloses an improved control loop of the up and down gate electric actuator of the coal feeder, which can effectively reduce the influence of vibration on the control loop of the electric actuator of the coal feeder, thereby improving the overall reliability and stability of the equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0017] The structures, proportions, sizes and the like shown in the specification are only used to cooperate with the content disclosed in the specification for understanding and reading by those skilled in the art, and are not used to limit the implementation conditions of the present utility model, so they do not have technical substantive significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present utility model, should still fall within the scope of the technical content disclosed by the present utility model.

[0018] Figure 1 The circuit diagram of the present utility model.

[0019] Among them: 1 is electric actuator part, 2 is coal feeder control cabinet, U is control power, QF1 is first circuit breaker, AN is up and down gate electric actuator, SB1 is first button switch, SB2 is second button switch, KM1 is first contactor, KM2 is second contactor, KA1 is first relay, KA2 is second relay, LDE1 is first auxiliary switch, LDE2 is second auxiliary switch, K is DCS open instruction, G is DCS close instruction, LSO is valve open feedback, LSC is valve close feedback, HL1 is first indicator light, HL2 is second indicator light, AC is 380V three-phase AC power supply, L1 is first firewire, L2 is second firewire, L3 is third firewire, KH is thermal relay, QF2 is second circuit breaker. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. These descriptions are only for further illustrating the features and advantages of the present application, but not for limiting the claims of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0021] The specific embodiments of the present application will be further described in detail below in combination with the drawings and embodiments. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0022] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0023] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0024] A coal feeder upper and lower gate electric actuator control circuit, such as Figure 1As shown, it comprises an electrically operated part 1 and a coal feeder control cabinet 2, the electrically operated part 1 is electrically connected with the coal feeder control cabinet 2, the coal feeder control cabinet 2 comprises a control power supply U, a first circuit breaker QF1, an up-down gate electric actuator AN, a first button switch SB1, a second button switch SB2, a first contactor KM1, a second contactor KM2, a first relay KA1 and a second relay KA2. The control power supply U is electrically connected with the up-down gate electric actuator AN through the first circuit breaker QF1. The control power supply U directly provides power for the up-down gate electric actuator AN. The first output end of the up-down gate electric actuator AN is respectively connected with the first button switch SB1 and the second button switch SB2, the first button switch SB1 and the second button switch SB2 are used to control the action of the up-down gate electric actuator AN. When the first button switch SB1 is pressed, the coil of the second contactor KM2 is electrified, its normally closed contact is opened, thereby cutting off the power supply circuit of the first relay KA1, so that the first relay KA1 cannot be electrified. At the same time, the normally open contact of the second contactor KM2 is closed, so that the coil of the first contactor KM1 is electrified, the first contactor KM1 is attracted, its normally closed contact is opened, preventing the second button switch SB2 from affecting the second contactor KM2. When the second button switch SB2 is pressed, the coil of the first contactor KM1 is electrified, its normally closed contact is opened, thereby cutting off the power supply circuit of the second relay KA2, so that the second relay KA2 cannot be electrified. At the same time, the normally open contact of the first contactor KM1 is closed, so that the coil of the second contactor KM2 is electrified, the second contactor KM2 is attracted, its normally closed contact is opened, preventing the first button switch SB1 from affecting the first contactor KM1. This design ensures that only one contactor can be electrified and control the action of the electric actuator at any time through the interlocking of the button and the contactor, which can avoid the risk of short circuit caused by the simultaneous electrification of the two contactors.

[0025] Further, the coal feeder control cabinet 2 further comprises a first auxiliary switch LDE1 and a second auxiliary switch LDE2, the first auxiliary switch LDE1 is electrically connected between the normally closed contact of the second contactor KM2 and the normally closed contact of the first relay KA1, the second auxiliary switch LDE2 is electrically connected between the normally closed contact of the first contactor KM1 and the normally closed contact of the second relay KA2, the first auxiliary switch LDE1 and the second auxiliary switch LDE2 play the role of isolation and protection in the circuit.

[0026] Further, the coal feeder control cabinet 2 further comprises a DCS open instruction K and a DCS close instruction G. When the DCS open instruction K is activated, it is electrically connected to the normally closed contact of the second contactor KM2. When the DCS open instruction K is activated, the normally closed contact of the second contactor KM2 is opened, thereby allowing the coil of the second contactor KM2 to be powered and attracted. At the same time, the DCS open instruction K is also connected in parallel to the first normally open contact of the first contactor KM1. Therefore, when the DCS open instruction K is activated, the first normally open contact of the first contactor KM1 is also closed, allowing the coil of KM1 to be powered and attracted. When the DCS close instruction G is activated, it is electrically connected to the normally closed contact of the first contactor KM1. This means that when the DCS close instruction G is activated, the normally closed contact of KM1 is opened, thereby preventing the coil of KM1 from being powered. At the same time, the DCS close instruction G is also connected in parallel to the first normally open contact of the second contactor KM2. Therefore, when the DCS close instruction G is activated, the first normally open contact of KM2 is also closed, allowing the coil of KM2 to be powered and attracted. When the gate needs to be opened, the DCS open instruction K is activated, causing the coil of KM2 to be powered and attracted, and at the same time, the coil of KM1 is also powered and attracted. At this time, the gate electric actuator starts to run. When the gate needs to be closed, the DCS close instruction G is activated, causing the coil of KM1 to lose power and release, and at the same time, the coil of KM2 is powered and attracted. At this time, the gate electric actuator stops running. Throughout the circuit, there is an interlocking mechanism between KM1 and KM2. When KM1 is attracted, its normally closed contact is opened, preventing the coil of KM2 from being powered; conversely, when KM2 is attracted, its normally closed contact is opened, preventing the coil of KM1 from being powered. This interlocking mechanism ensures that at any time only one contactor can be powered and attracted, thereby avoiding the risk of short circuit of the main circuit.

[0027] Further, the coal feeder control cabinet 2 further comprises a valve open feedback LSO, a valve close feedback LSC, a first indicator light HL1, and a second indicator light HL2. The valve open feedback LSO and the valve close feedback LSC detect the opening and closing states of the valve respectively. When the valve is opened, the LSO signal is activated, and when the valve is closed, the LSC signal is activated. When the valve is opened, the LSO signal is activated, causing the coil of the first relay KA1 to be powered, thereby causing the normally open contact of KA1 to be closed. At this time, the first indicator light HL1 is powered and lit, indicating that the valve is in the open state. When the valve is closed, the LSC signal is activated, causing the coil of the second relay KA2 to be powered, thereby causing the normally open contact of KA2 to be closed. At this time, the second indicator light HL2 is powered and lit, indicating that the valve is in the closed state. Since the normally open contacts of KA1 and KA2 are connected to HL1 and HL2 respectively, once KA1 or KA2 is powered, its normally open contact will remain closed, even if the subsequent signal disappears, the indicator light will continue to light. This design ensures that after the valve state changes, the indicator light can continuously display the current state.

[0028] Further, the electric actuating part 1 comprises a 380V three-phase AC power supply AC, a first live wire L1, a second live wire L2, a third live wire L3, in which circuit, the first live wire L1, the second live wire L2, the third live wire L3 are electrically connected with the 380V three-phase AC power supply AC through the second circuit breaker QF2, the input end of the power supply is controlled through the second circuit breaker QF2, which ensures the on-off and safety of the power supply. The U, V, W terminals of the motor 3M are connected through the second normally open contact of the first contactor KM1 and the second normally open contact of the second contactor KM2 respectively. Specifically, the first live wire L1, the second live wire L2, the third live wire L3 are connected with the U, V, W terminals of the motor through the second normally open contact of KM1 and KM2 respectively, so that the motor 3M can change its wiring sequence according to the state of the contactor, thereby realizing forward and reverse rotation control. In addition, the second normally open contact of KM1 and KM2 is also electrically connected with the motor 3M through the thermal relay KH. The function of the thermal relay KH is to realize the overload protection of the motor. When the motor is overloaded, the bimetallic strip inside the thermal relay deforms due to excessive current, triggering the control circuit to disconnect, thereby protecting the motor from damage.

[0029] The above only details the preferred embodiments of the present application, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application, and all the changes shall be included in the protection scope of the present application.

Claims

1. A control loop for an electric actuator of a top and bottom gate of a coal feeder, characterized by: The application relates to a coal feeder control cabinet (2) comprising an electric execution part (1) and a coal feeder control cabinet (2), wherein the electric execution part (1) is electrically connected with the coal feeder control cabinet (2), the coal feeder control cabinet (2) comprises a control power supply (U), a first circuit breaker (QF1), an upper and lower gate electric executor (AN), a first button switch (SB1), a second button switch (SB2), a first contactor (KM1), a second contactor (KM2), a first relay (KA1) and a second relay (KA2), the control power supply (U) is electrically connected with the upper and lower gate electric executor (AN) through the first circuit breaker (QF1), the first output end of the upper and lower gate electric executor (AN) is respectively electrically connected with the first button switch (SB1) and the second button switch (SB2), the first button switch (SB1) is electrically connected with the normally closed contact of the second contactor (KM2), the normally closed contact of the second contactor (KM2) is electrically connected with the normally closed contact of the first relay (KA1), the normally closed contact of the first relay (KA1) is electrically connected with the coil of the first contactor (KM1), the second button switch (SB2) is electrically connected with the normally closed contact of the first contactor (KM1), the normally closed contact of the first contactor (KM1) is electrically connected with the normally closed contact of the second relay (KA2), and the normally closed contact of the second relay (KA2) is electrically connected with the coil of the second contactor (KM2).

2. A control circuit for an electric actuator of a top and bottom gate of a coal feeder according to claim 1, characterized in that: The coal feeder control cabinet (2) further comprises a first auxiliary switch (LDE1) and a second auxiliary switch (LDE2), the first auxiliary switch (LDE1) is arranged between the normally closed contact of the second contactor (KM2) and the normally closed contact of the first relay (KA1), and the second auxiliary switch (LDE2) is arranged between the normally closed contact of the first contactor (KM1) and the normally closed contact of the second relay (KA2).

3. A control circuit for an electric actuator of a top and bottom gate of a coal feeder according to claim 1, characterized in that: The coal feeder control cabinet (2) further comprises a DCS opening instruction (K) and a DCS closing instruction (G), the second output end of the upper and lower gate electric executor (AN) is respectively electrically connected with the DCS opening instruction (K) and the DCS closing instruction (G), the DCS opening instruction (K) is electrically connected with the normally closed contact of the second contactor (KM2), and the DCS closing instruction (G) is electrically connected with the normally closed contact of the first contactor (KM1).

4. A control circuit for an electric actuator of a gate of a coal feeder according to claim 3, characterized in that: The DCS opening instruction (K) is connected in parallel with the first normally open contact of the first contactor (KM1), and the DCS closing instruction (G) is connected in parallel with the first normally open contact of the second contactor (KM2).

5. A control circuit for an electric actuator of a gate of a coal feeder according to claim 1, characterized in that: The coal feeder control cabinet (2) further comprises a valve opening feedback (LSO), a valve closing feedback (LSC), a first indicator lamp (HL1) and a second indicator lamp (HL2), the control power supply (U) is respectively electrically connected with the valve opening feedback (LSO) and the valve closing feedback (LSC) through the first circuit breaker (QF1), the valve opening feedback (LSO) is electrically connected with the coil of the first relay (KA1), and the valve closing feedback (LSC) is electrically connected with the coil of the second relay (KA2).

6. A control circuit for an electrically operated gate operator for a coal feeder as claimed in claim 5, characterised in that: The control power supply (U) is respectively electrically connected with the normally open contact of the first relay (KA1) and the normally open contact of the second relay (KA2) through the first circuit breaker (QF1), the normally open contact of the first relay (KA1) is electrically connected with the first indicating lamp (HL1), and the normally open contact of the second relay (KA2) is electrically connected with the second indicating lamp (HL2).

7. A control circuit for an electric actuator of a top and bottom gate of a coal feeder according to claim 1, characterized in that: The electric execution part (1) includes a 380V three-phase alternating current power supply (AC), a first firewire (L1), a second firewire (L2), and a third firewire (L3), the first firewire (L1), the second firewire (L2), and the third firewire (L3) are electrically connected to the 380V three-phase alternating current power supply (AC), the first firewire (L1), the second firewire (L2), and the third firewire (L3) are respectively electrically connected to the U terminal, the V terminal, and the W terminal of the motor (3M) through the second normally open contact of the first contactor (KM1), and the first firewire (L1), the second firewire (L2), and the third firewire (L3) are respectively electrically connected to the W terminal, the V terminal, and the U terminal of the motor (3M) through the second normally open contact of the second contactor (KM2).

8. A control circuit for an electrically operated gate operator for a coal feeder as claimed in claim 7, characterised in that: The second normally open contact of the first contactor (KM1) and the second normally open contact of the second contactor (KM2) are electrically connected to the motor (3M) through the thermal relay (KH).

9. A control circuit for an electrically operated gate operator for a coal feeder as claimed in claim 7, characterised in that: The first firewire (L1), the second firewire (L2), and the third firewire (L3) are electrically connected to the 380V three-phase alternating current power supply (AC) through the second circuit breaker (QF2).

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