Redundant self-locking drive control device for frequency converter of cigarette making equipment

Abstract

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

Description

Technical Field

[0001] The invention relates to the field of cigarette manufacturing equipment, and in particular to a redundant self-locking drive control device for a frequency converter of cigarette equipment. Background Art

[0002] A large number of frequency converters are needed in cigarette making equipment to drive motors used in various scenarios. Therefore, the failure rate of frequency converters used by tobacco companies will be relatively large. When the frequency converter fails, it will be directly related to the operation of the corresponding equipment motor.

[0003] At present, there have been many problems in actual applications where the motor on the corresponding cigarette making equipment cannot stop running in time due to inverter failure. After analysis, it is mainly because the path between the inverter output end and the motor cannot be reliably disconnected after the above-mentioned device fails. Summary of the invention

[0004] 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 making device, so as to solve the problem that it is impossible to reliably cut off the power supply to the motor of the cigarette making device.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A redundant self-locking drive control device for a frequency converter of a cigarette making equipment, comprising: a frequency converter, a first relay, a coil of the first relay connected to an operation signal source, and a first normally open switch and a second normally open switch of the first relay respectively connected to the frequency converter, for providing an activation command signal and an enable signal to the frequency converter, wherein the drive control device further comprises a second relay, a contactor and a time relay;

[0007] The power contact of the contactor is connected between the output end of the frequency converter and the motor;

[0008] The coil of the second relay is connected to the frequency converter;

[0009] The coil of the time relay is connected to the operation 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;

[0010] Two ends of the third normally open switch of the first relay are respectively connected to the power supply and the coil of the contactor;

[0011] 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 circuit, the two ends of the cut-off circuit are respectively connected to the power supply and the coil of the contactor, and the third normally open switch of the first relay is connected in parallel to the cut-off circuit.

[0012] In at least one possible implementation manner, the normally open switch of the contactor is arranged in the cut-off circuit and is connected in series with the normally open switch of the second relay and the normally open switch of the time relay.

[0013] In at least one possible implementation manner, the time relay is a delayed-off time relay.

[0014] In at least one possible implementation manner, the contactor, the second relay, and the time relay are all 24V DC devices.

[0015] In at least one possible implementation manner, the power supply is a 24VDC power supply.

[0016] In at least one possible implementation manner, the breaking performance of the power contact of the contactor matches the power of the motor.

[0017] In at least one possible implementation manner, the motor is a three-phase AC motor.

[0018] In at least one possible implementation manner, two ends of the coil of the second relay are respectively connected to current detection terminals of the inverter.

[0019] In at least one possible implementation manner, the frequency converter has a minimum speed setting function.

[0020] 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 frequency converter. Specifically, the contactor is connected between the frequency converter 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 the operation signal source, the specific normally open switch of the first relay is connected to the power supply and the contactor coil respectively, and the normally open switches of the second relay and the time relay are connected in series and in parallel with the specific normally open switch of the first relay to form a cut-off circuit with a self-locking mechanism. The present invention can ensure the safe and reliable disconnection of the contactor, and also play a role in extending the life of the contactor, so that the path between the motor and the frequency converter can be safely and reliably cut off in specific scenarios. In particular, the safety redundancy design of the time relay and the second relay can ensure that the drive circuit of the frequency converter and the motor is accurately and reliably disconnected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to make the purpose, technical solutions and advantages of the present invention more clear, the present invention will be further described below with reference to the accompanying drawings, in which:

[0022] Figure 1 Schematic diagram of a redundant self-locking drive control device for a frequency converter of a cigarette making equipment provided by an embodiment of the present invention Figure 1;

[0023] Figure 2 Schematic diagram of a redundant self-locking drive control device for a frequency converter of a cigarette making equipment provided by an embodiment of the present invention Figure 2 . DETAILED DESCRIPTION

[0024] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0025] The present invention proposes an embodiment of a redundant self-locking drive control device for a frequency converter of a cigarette making machine. Specifically, Figure 1 and Figure 2 As shown, it includes: a frequency converter 100, a first relay K1, the coil of the first relay K1 is connected to the operation signal source, and the first normally open switch and the second normally open switch of the first relay K1 are respectively connected to the frequency converter 100, for providing an activation command signal and an enable signal to the frequency converter 100, and further includes a second relay K3, a contactor K2 and a time relay K4;

[0026] The power contact of the contactor K2 is connected between the output end of the frequency converter 100 and the motor;

[0027] The coil of the second relay K3 is connected to the inverter 100, and the second relay K3 is used to detect the output current of the inverter 100;

[0028] The coil of the time relay K4 is connected to the operation signal source and is connected in parallel with the coil of the first relay K1. The time relay K4 is used to provide cut-off timing;

[0029] Two ends of the third normally open switch of the first relay K1 are connected to the power supply and the coil of the contactor K2 respectively;

[0030] 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 circuit, the two ends of the cut-off circuit are respectively connected to the power supply and the coil of the contactor K2, and the third normally open switch of the first relay K1 is connected in parallel to the cut-off circuit.

[0031] Furthermore, 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.

[0032] Furthermore, the time relay K4 is a delayed-off time relay.

[0033] Furthermore, the contactor K2, the second relay K3 and the time relay K4 are all 24V DC devices. It can be understood that the first relay K1 is also a 24V DC relay.

[0034] Furthermore, the power supply is a 24VDC power supply, such as a switching power supply.

[0035] Furthermore, when selecting the type, the breaking performance of the power contact of the contactor K2 matches the power of the motor.

[0036] Furthermore, two ends of the coil of the second relay K3 are respectively connected to current detection terminals of the inverter 100 .

[0037] Furthermore, the frequency converter 100 has a minimum speed (minimum output frequency, which is related to the current detected by K3) setting function.

[0038] Furthermore, the motor is a three-phase AC motor.

[0039] Here, the working principle of the present invention is schematically introduced in combination with the embodiments mentioned above:

[0040] (1) When the operation signal source is at a high level (24VDC), the K1 coil is energized, and its third normally open switch is closed to energize the K2 coil. The normally open power contact of K2 is closed to connect the output terminal of the inverter 100 and the motor, and the motor is in a driving state. At this time, the first and second normally open switches of K1 are also closed to provide command signals and enable signals to the inverter 100. At this time, the motor can run at the speed required by the process. It can be explained that the action time difference of each group of normally open switches of K1 is less than 30ms, which can be understood as simultaneous closing and opening.

[0041] 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 and its normally open switch will be closed. At the same time, the aforementioned operating signal source enables the coil of K4 to be energized and its normally open switch will also be closed. In the aforementioned cut-off circuit, the two main normally open switches (from K3 and K4) are both closed, so that the 24VDC power supply now supplies power to the coil of K2 via the cut-off circuit and the third normally open switch of K1, thereby realizing circuit self-locking.

[0042] (2) When the running signal source is at a low level, the K1 coil loses power, and the set time T of K4 starts timing (the present invention does not limit the setting of the delay time T, but it can be considered to be combined with the actual scene requirements, and the T value can be set to be greater than the time for the inverter 100 to brake from the preset maximum speed to zero speed, for example, 5-15S); the K1 normally open switch is disconnected at the same time, and the inverter 100 is in a state of no control signal input, and when the third normally open switch of K1 is disconnected, the self-locking circuit of the contactor K2 (that is, the cut-off circuit) is in an unlocked state;

[0043] As the inverter 100 controls the motor to decelerate, and when the output current of the inverter 100 is zero, the K3 coil loses power, the normally open switch of K3 in the cut-off circuit is disconnected, the K2 coil loses power, and its normally open power contact is disconnected, thereby cutting off the electrical path between the inverter 100 and the motor; and if certain faults occur, causing the output current of the inverter 100 to be not 0 or K3 itself to fail and unable to disconnect the normally open switch of K3, then after the set time T of K4 is reached, the normally open switch of K4 in the cut-off circuit is disconnected, and the power supply of the K2 coil is also disconnected, ensuring that the motor can no longer be driven by the inverter 100, thereby adding safety redundancy to the entire motor drive circuit.

[0044] 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 frequency converter. Specifically, the contactor is connected between the frequency converter 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 the operation signal source, the specific normally open switch of the first relay is connected to the power supply and the contactor coil respectively, and the normally open switches of the second relay and the time relay are connected in series and in parallel with the specific normally open switch of the first relay to form a cut-off circuit with a self-locking mechanism. The present invention can ensure the safe and reliable disconnection of the contactor, and also play a role in extending the life of the contactor, so that the path between the motor and the frequency converter can be safely and reliably cut off in specific scenarios. In particular, the safety redundancy design of the time relay and the second relay can ensure that the drive circuit of the frequency converter and the motor is accurately and reliably disconnected.

[0045] In the embodiments of the present invention, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent the existence of A alone, the existence of A and B at the same time, and the existence of B alone. A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after are in 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 multiple.

[0046] The above describes in detail the structure, features and effects of the present invention based on the embodiments shown in the drawings, but the above is only a preferred embodiment of the present invention. It should be noted that the technical features involved in the above embodiments and their preferred methods can be reasonably combined and matched into a variety of equivalent schemes by those skilled in the art without departing from or changing the design ideas and technical effects of the present invention; therefore, the present invention is not limited to the scope of implementation shown in the drawings, and all changes made in accordance with the concept of the present invention, or modifications to equivalent embodiments with equivalent changes, which still do not exceed the spirit covered by the specification and drawings, should be within the protection scope of the present invention.

Claims

1. A redundant self-locking drive control device for a frequency converter of a cigarette making equipment, comprising: A frequency converter, a first relay, a coil of the first relay is connected to an operation signal source, and a first normally open switch and a second normally open switch of the first relay are respectively connected to the frequency converter, for providing an activation command signal and an enable signal to the frequency converter, wherein the drive control device further comprises 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 to the frequency converter; The coil of the time relay is connected to the operation 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; Two ends of the third normally open switch of the first relay are respectively connected to 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 circuit, the two ends of the cut-off circuit are respectively connected to the power supply and the coil of the contactor, and the third normally open switch of the first relay is connected in parallel to the cut-off circuit; Among them, the action time difference of each normally open switch of the first relay is less than 30ms, and when the inverter is controlled and drives the motor, the minimum current is not 0.

2. The redundant self-locking drive control device for the frequency converter of cigarette equipment according to claim 1, characterized in that: The normally open switch of the contactor is arranged in the cut-off circuit and is connected in series with the normally open switch of the second relay and the normally open switch of the time relay.

3. The redundant self-locking drive control device for a frequency converter of a cigarette making equipment according to claim 1, characterized in that: The time relay is a delayed disconnection time relay.

4. The redundant self-locking drive control device for a frequency converter of a cigarette making equipment according to claim 1, characterized in that: The contactor, the second relay and the time relay are all 24V DC devices.

5. The redundant self-locking drive control device for the frequency converter of cigarette equipment according to claim 4, characterized in that: The power supply is a 24VDC power supply.

6. The redundant self-locking drive control device for a frequency converter of a cigarette making equipment according to claim 1, characterized in that: The breaking performance of the power contact of the contactor matches the power of the motor.

7. The redundant self-locking drive control device for a frequency converter of a cigarette making equipment according to claim 6, characterized in that: The motor is a three-phase AC motor.

8. The redundant self-locking drive control device for a frequency converter of a cigarette making equipment according to claim 1, characterized in that: Both ends of the coil of the second relay are connected to the current detection terminals of the inverter respectively.

9. The redundant self-locking drive control device for a frequency converter of a cigarette making equipment according to any one of claims 1 to 8, characterized in that: The frequency converter has a minimum speed setting function.

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