CN114389513A - Redundant Self-locking Drive Control Device for Inverter of Cigarette Equipment - Google Patents

Abstract

The invention discloses a redundant self-locking drive control device for a frequency converter of cigarette equipment. The main design concept of the present invention is that a second relay, a contactor and a time relay cooperate with the first relay to provide an output cut-off mechanism for the frequency converter , Specifically, the contactor is connected between the inverter and the motor, the second relay coil is connected to the inverter, the time relay coil is connected in parallel with the first relay coil to run the signal source, and the specific normally open switch of the first relay is connected to the power supply Connected with the contactor coil, the second relay and the normally open switch of the time relay are connected in series with the specific normally open switch of the first relay to form a cut-off circuit with a self-locking mechanism. The invention can ensure the safe and reliable disconnection of the contactor, so that the passage between the motor and the frequency converter can be safely and reliably cut off in a specific scenario, especially, the time relay and the second relay constitute a safety redundant design.

Description

Redundant Self-locking Drive Control Device for Inverter of Cigarette Equipment

technical field

The invention relates to the field of cigarette manufacturing equipment, in particular to a redundant self-locking drive control device for a frequency converter of cigarette equipment.

Background technique

Cigarette equipment needs to use a large number of inverters to drive motors used in various scenarios. Therefore, the failure rate of inverters used by tobacco companies is relatively high, and when the inverter fails, it will directly Associated with the operation of the corresponding equipment motor.

At present, there have been many problems in practical applications that the motor on the corresponding cigarette equipment cannot stop running in time due to the failure of the inverter. After analysis, the main reason is that the output of the inverter cannot be reliably disconnected after the failure of the motor. .

SUMMARY OF THE INVENTION

In view of the above, the present invention aims to provide a redundant self-locking drive control device for a frequency converter of a cigarette equipment, so as to solve the problem that the motor of the cigarette equipment cannot be powered off reliably.

The technical scheme adopted in the present invention is as follows:

A redundant self-locking drive control device for a frequency converter of cigarette equipment, comprising: a frequency converter, a first relay, a coil of the first relay is connected to a running signal source, and a first normally open switch of the first relay and The second normally open switches are respectively connected with the frequency converter, and are used for providing an activation command signal and an enabling signal to the frequency converter, wherein the drive control device further includes a second relay, a contactor and a time relay;

The power contact of the contactor is connected between the output end of the frequency converter and the motor;

the coil of the second relay is connected with the frequency converter;

The coil of the time relay is connected to the operating signal source and is connected in parallel with the coil of the first relay, and the time relay is used to provide cut-off timing;

Both ends of the third normally open switch of the first relay are respectively connected with the power supply and the coil of the contactor;

The normally open switch of the second relay and the normally open switch of the time relay are connected in series to form a cut-off line, two ends of the cut-off line are respectively connected to the power supply and the coil of the contactor, and the first A third normally open switch of the relay is connected in parallel with the cut-off line.

In at least one possible implementation manner, the normally open switch of the contactor is provided in the cut-off line, and is connected in series with the normally open switch of the second relay and the normally open switch of the time relay.

In at least one of the possible implementations, the time relay is a delayed disconnection time relay.

In at least one possible implementation manner, the contactor, the second relay and the time relay are all 24V DC devices.

In at least one possible implementation manner, the power supply is a 24VDC power supply.

In at least one possible implementation manner, the breaking performance of the power contact of the contactor matches the power of the motor.

In at least one possible implementation manner, the motor is a three-phase AC motor.

In at least one possible implementation manner, both ends of the coil of the second relay are respectively connected to the current detection terminals of the frequency converter.

In at least one possible implementation manner, the frequency converter has a minimum speed setting function.

The main design concept of the present invention is that the second relay, the contactor and the time relay cooperate with the first relay to provide an output cut-off mechanism for the inverter. Specifically, the contactor is connected between the inverter and the motor, and the second relay coil Connected to the frequency converter, the time relay coil is connected in parallel with the first relay coil to run the signal source, the specific normally open switch of the first relay is respectively connected to the power supply and the contactor coil, the second relay and the normally open switch of the time relay are connected in series with The specific normally open switch of the first relay is connected in parallel to form a cut-off line with a self-locking mechanism. The invention can ensure the safe and reliable disconnection of the contactor, and can also play the role of prolonging the life of the contactor, so that the passage between the motor and the inverter can be safely and reliably cut off in a specific scenario, especially, the time relay The safety redundant design with the second relay can ensure accurate and reliable disconnection of the drive circuit between the inverter and the motor.

Description of drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described below in conjunction with the accompanying drawings, wherein:

1 is a schematic diagram 1 of a redundant self-locking drive control device for a frequency converter of a cigarette equipment provided by an embodiment of the present invention;

FIG. 2 is a second schematic diagram of a redundant self-locking drive control device for a frequency converter of a cigarette equipment according to an embodiment of the present invention.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, but not to be construed as a limitation of the present invention.

The present invention proposes an embodiment of a redundant self-locking drive control device for a frequency converter of a cigarette equipment. Specifically, as shown in FIG. 1 and FIG. 2 , it includes: a frequency converter 100, a first relay K1, and the first relay K1. The coil of a relay K1 is connected to the operating signal source, and the first normally open switch and the second normally open switch of the first relay K1 are respectively connected to the inverter 100 for providing an activation command to the inverter 100 signal and enable signal, which also includes the second relay K3, the contactor K2 and the time relay K4;

The power contact of the contactor K2 is connected between the output end of the frequency converter 100 and the motor;

The coil of the second relay K3 is connected to the frequency converter 100, and the second relay K3 is used to detect the output current of the frequency converter 100;

The coil of the time relay K4 is connected to the operating signal source, and is connected in parallel with the coil of the first relay K1, and the time relay K4 is used to provide cut-off timing;

Both ends of the third normally open switch of the first relay K1 are respectively connected with the power supply and the coil of the contactor K2;

The normally open switch of the second relay K3 and the normally open switch of the time relay K4 are connected in series to form a cut-off line, and both ends of the cut-off line are respectively connected to the power supply and the coil of the contactor K2, and the first The third normally open switch of a relay K1 is connected in parallel with the cut-off line.

Further, the normally open switch of the contactor K2 is arranged in the cut-off circuit, and is connected in series with the normally open switch of the second relay K3 and the normally open switch of the time relay K4.

Further, the time relay K4 is a delayed disconnection time relay.

Further, the contactor K2, the second relay K3 and the time relay K4 are all 24V DC devices, and it is understandable that the first relay K1 is also a 24V DC relay.

Further, the power supply is a 24VDC power supply, such as a switching power supply and the like.

Further, during model selection, the breaking performance of the power contact of the contactor K2 matches the power of the motor.

Further, both ends of the coil of the second relay K3 are respectively connected to the current detection terminals of the inverter 100 .

Further, the frequency converter 100 has a minimum speed (minimum output frequency, related to the current detected by K3) setting function.

Further, the motor is a three-phase AC motor.

Here, the working principle of the present invention will be schematically introduced in conjunction with the above-mentioned embodiments:

(1) When the operating signal source is high level (24VDC), the K1 coil is energized, the third normally open switch is closed to make the K2 coil energized, and the normally open power contact of K2 is closed to connect the output end of the inverter 100 to the The path of the motor, the motor is in the driving state; at this time, the first and second normally open switches of K1 will also be closed to provide command signals and enabling signals for the inverter 100. At this time, the motor can run at the speed required by the process. It can be explained that The thing is, the action time difference of each group of normally open switches of K1 is less than 30ms, which can be understood as closing and opening at the same time.

Since the minimum speed output by the inverter 100 can be manually set to be greater than 0 (such as 0.2-0.5HZ, that is, the minimum current in the process of the inverter 100 being controlled to drive the motor is not 0), the coil of K3 will be energized, Its normally open switch is closed, and at the same time, the K4 coil is energized when the aforementioned operating signal source is energized, and its normally open switch is also closed. At this time, the 24VDC power supply supplies power to the K2 coil through the cut-off line and the third normally open switch of K1 respectively, so as to realize the circuit self-locking.

(2) When the operating signal source is at a low level, the K1 coil is de-energized, and the set time T of K4 starts timing at this time (the present invention does not limit the setting of the delay time T, but it can be considered in combination with the actual scene needs, T The value is set to be greater than the time that the inverter 100 brakes from the preset maximum speed to zero speed, such as 5-15S); the normally open switch of K1 is turned off at the same time, the inverter 100 is in the state of no control signal input, and when the third After the normally open switch is disconnected, the self-locking circuit of the contactor K2 (that is, the cut-off circuit) is in an unlocked state;

As the inverter 100 controls the motor to decelerate, and when the output current of the inverter 100 is zero, the K3 coil is de-energized, the normally open switch of K3 in the cut-off line is disconnected, the K2 coil is de-energized, and its normally open power contact is disconnected, In this way, the electrical path between the inverter 100 and the motor is cut off; and if some fault occurs, the output current of the inverter 100 is not 0 or the K3 itself is faulty, and the normally open switch of K3 cannot be disconnected. After T arrives, the normally open switch of K4 in the cut-off circuit is disconnected, and the power supply of the K2 coil will also be disconnected to ensure that the motor is no longer possible to be driven by the inverter 100, which increases the safety and redundancy of the entire motor drive circuit. Remain.

In summary, the main design concept of the present invention is that the second relay, the contactor and the time relay cooperate with the first relay to provide an output cut-off mechanism for the inverter. Specifically, the contactor is connected between the inverter and the motor. , the second relay coil is connected to the frequency converter, the time relay coil is connected in parallel with the first relay coil to run the signal source, the specific normally open switch of the first relay is connected to the power supply and the contactor coil respectively, the second relay and the time relay are normally After the open switch is connected in series, it is connected in parallel with the specific normally open switch of the first relay to form a cut-off circuit with a self-locking mechanism. The invention can ensure the safe and reliable disconnection of the contactor, and can also play the role of prolonging the life of the contactor, so that the passage between the motor and the inverter can be safely and reliably cut off in a specific scenario, especially, by the time relay The safety redundancy design with the second relay can ensure accurate and reliable disconnection of the drive circuit between the inverter and the motor.

In the embodiments of the present invention, "at least one" refers to one or more, and "multiple" refers to two or more. "And/or", which describes the association relationship of the associated objects, means that there can be three kinds of relationships, for example, A and/or B, which can indicate the existence of A alone, the existence of A and B at the same time, and the existence of B alone. where A and B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, where a, b, c may be single, or Can be multiple.

The structure, features, and effects of the present invention have been described in detail above according to the embodiments shown in the drawings, but the above are only preferred embodiments of the present invention. Features, those skilled in the art can reasonably combine and match into a variety of equivalent solutions without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention does not limit the scope of implementation as shown in the drawings, Any changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, shall fall within the protection scope of the present invention if they do not exceed the spirit covered by the description and drawings.

Claims (9)

1. A redundant self-locking drive control device for a frequency converter of a cigarette equipment, comprising: a frequency converter, a first relay, the coil of the first relay is connected with a running signal source, and the first normally open of the first relay The switch and the second normally open switch are respectively connected with the frequency converter, and are used to provide the frequency converter with an activation command signal and an enabling signal, and it is characterized in that the drive control device further includes a second relay, a contactor and a time relay; The power contact of the contactor is connected between the output end of the frequency converter and the motor; the coil of the second relay is connected with the frequency converter; The coil of the time relay is connected to the operating signal source and is connected in parallel with the coil of the first relay, and the time relay is used to provide cut-off timing; Both ends of the third normally open switch of the first relay are respectively connected with the power supply and the coil of the contactor; The normally open switch of the second relay and the normally open switch of the time relay are connected in series to form a cut-off line, two ends of the cut-off line are respectively connected to the power supply and the coil of the contactor, and the first A third normally open switch of the relay is connected in parallel with the cut-off line. 2 . The redundant self-locking drive control device for a frequency converter of cigarette equipment according to claim 1 , wherein the normally open switch of the contactor is arranged in the cut-off circuit, and is connected with the second relay. 3 . The normally open switch and the normally open switch of the time relay are connected in series. 3 . The redundant self-locking drive control device for a frequency converter of a cigarette equipment according to claim 1 , wherein the time relay is a delayed disconnection time relay. 4 . 4 . The redundant self-locking drive control device for a frequency converter of cigarette equipment according to claim 1 , wherein the contactor, the second relay and the time relay are all 24V DC devices. 5 . 5 . The redundant self-locking drive control device for a frequency converter of a cigarette equipment according to claim 4 , wherein the power supply is a 24VDC power supply. 6 . 6 . The redundant self-locking drive control device for a frequency converter of a cigarette equipment according to claim 1 , wherein the breaking performance of the power contact of the contactor matches the power of the motor. 7 . 7 . The redundant self-locking drive control device for a frequency converter of cigarette equipment according to claim 6 , wherein the motor is a three-phase AC motor. 8 . 8 . The redundant self-locking drive control device for a frequency converter of cigarette equipment according to claim 1 , wherein two ends of the coil of the second relay are respectively connected to the current detection terminals of the frequency converter. 9 . 9 . The redundant self-locking drive control device for a frequency converter of cigarette equipment according to claim 1 , wherein the frequency converter has a minimum speed setting function. 10 .

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