CN220629211U - Electromechanical stirring frequency conversion system with standby frequency converter - Google Patents

Abstract

The utility model relates to an electromechanical stirring frequency conversion system with a standby frequency converter, which comprises an online frequency converter and a standby frequency converter, wherein the input end of the online frequency converter is sequentially connected with a fuse, an isolation transformer, a first circuit breaker and a power supply, the output end of the online frequency converter is sequentially connected with a first terminal box and an electromagnetic coil, the input end of the standby frequency converter is connected with a second circuit breaker, the second circuit breaker can be switched with the fuse, the output end of the standby frequency converter is connected with a second terminal box, the second terminal box can be switched with the first terminal box, when the online frequency converter fails, the online frequency converter can be immediately dismantled in the first terminal box to be connected with the terminal lead of the second terminal box to realize the switching with the first terminal box without checking the failure, the required transformation cost is less, the space is smaller, the period is shorter, the operation is convenient, and the online frequency converter can be switched into the standby frequency converter with less time to achieve the purposes of reducing the failure loss and creating benefits.

Description

Electromechanical stirring frequency conversion system with standby frequency converter

Technical Field

The utility model belongs to the field of electromechanical stirring control systems, and particularly relates to an electromechanical stirring variable frequency system with a standby frequency converter.

Background

The matched electromagnetic stirring is one of important equipment of a steel smelting continuous casting machine, comprises a crystallizer electromagnetic stirring M-EMS, a solidification end secondary cooling area electromagnetic stirring S-EMS and an end electromagnetic stirring F-EMS, and can excite a stirring magnetic field to penetrate molten steel through a stirrer electromagnetic coil to generate induction current, the induction current and the magnetic field interact to generate electromagnetic force to drive the molten steel to move, so that convection movement in a liquid cavity is improved in the forced cooling and solidification process of a casting blank, and defects of molten steel superheat degree, casting blank component segregation, central porosity, central crack, surface inclusion, air holes and the like are overcome. The variable speed operation of electromagnetic stirring can be realized by adopting a frequency conversion technology, as shown in fig. 1, an electromechanical stirring frequency conversion system of a continuous casting production line in the prior art comprises a circuit breaker 23, an isolation transformer 4, a fuse 3, a frequency converter 24 and an electromagnetic coil 8 which are sequentially connected, and the circuit breaker is closed when in operation, so that the frequency converter is put into operation.

Because the frequency converter fault rate is higher and belongs to high-precision and high-requirement equipment, the frequency converter fault point is difficult to find, the related detection needs a very high frequency converter professional level, the professional staff of the original manufacturer is often required to go to the site for maintenance or return to the factory for maintenance, the maintenance is difficult, the time required for fault treatment and recovery is long, especially for the steel production unit which is not stopped for 24 hours, once the frequency converter breaks down, the treatment time is basically more than 20 hours, the first-aid repair equipment can only be stopped, even after the treatment time is long, the subsequent subsidiary production lines such as steel rolling and the like also need to stop production and wait for the production of products because no steel blanks are produced, and the loss caused by the subsequent subsidiary production lines such as steel rolling is huge, therefore, an electromechanical stirring frequency conversion system needs to be improved to reduce the benefit loss caused by the frequency converter fault.

Although the frequency conversion system with the standby frequency converter in the prior art can reduce the loss problem caused by the failure of the main frequency converter to a certain extent through switching the standby frequency conversion equipment, a complete standby system is generally required to be added, the frequency conversion system comprises a wire inlet transformer, the standby frequency converter and a power supply switching cabinet, and the frequency conversion system is applied to an electric stirring system and is also required to redesign and reform an electric stirring power supply circuit.

Secondly, the binding post case of converter is as shown in fig. 2, including box 11, be equipped with a plurality of binding post 25 in the box, three-phase power cable 28 and the earth cable 29 that the converter 24 was qualified for the next round of competitions stretch into in the box 11 from one side and be connected with binding post 25, electromagnetic coil 8's cable 26 and earth terminal cable 27 stretch into in the box 11 from the homonymy respectively, lie in the converter below of being qualified for the next round of competitions and be connected with binding post 25, lead to can only homonymy wiring, and because the limitation of converter length of being qualified for the next round of competitions leads to the wiring operation inconvenient, increases switching time.

In addition, the frequency converter in the cold standby state needs to be charged before being powered on, and normal use and switching processing time are further affected.

Disclosure of Invention

The utility model aims to solve at least one of the technical problems to a certain extent, and provides an electromechanical stirring frequency conversion system with a standby frequency converter, which has the advantages of less transformation cost, smaller space, shorter period and convenient operation, and can switch the on-line frequency converter into the standby frequency converter in less time when the on-line frequency converter fails, thereby achieving the purposes of reducing failure loss and creating benefits.

The technical scheme adopted for solving the technical problems is as follows:

the utility model provides an electromechanical stirring frequency conversion system of reserve converter, includes online converter and reserve converter, fuse, isolation transformer, first circuit breaker and power have been connected gradually to the input of online converter, and first terminal box and solenoid have been connected gradually to the output of online converter, the input of reserve converter is connected with the second circuit breaker, the second circuit breaker can with the fuse switching, the output of reserve converter is connected with the second terminal box, the second terminal box can with first terminal box switching.

Further, the first terminal box and the second terminal box all include the box, be equipped with a plurality of binding post in the box, the outgoing line of online converter and solenoid's lead wire are connected with the binding post both sides of first terminal box, perhaps be equipped with the terminal lead wire between first terminal box and the second terminal box, terminal lead wire and solenoid's lead wire are connected with the binding post both sides of first terminal box respectively, the outgoing line of reserve converter is connected with the binding post both sides of second terminal box respectively with the terminal lead wire.

Further, the box body comprises a cover body capable of being opened and closed, and wiring ports are formed in two sides of the box body.

Further, the binding post is including the last conductive plate, side conductive plate and the lower conductive plate that link to each other in proper order, it is equipped with a plurality of line noses respectively to go up conductive plate and lower conductive plate, be equipped with the connecting piece between lower conductive plate and the box.

Further, the first terminal box and the second terminal box are both located outside the on-line frequency converter and the standby frequency converter.

Further, the power supply comprises a hot standby power supply, wherein the hot standby power supply is sequentially connected with a third circuit breaker and a bulb, and the bulb can be connected with a standby frequency converter in series.

Compared with the prior art, the utility model has the beneficial effects that:

(1) When the frequency converter is in fault, the on-line frequency converter is removed from the first terminal box immediately, the terminal lead of the second terminal box is connected, and the switching between the first terminal box and the second terminal box is carried out, so that the power supply, the isolation transformer, the fuse, the standby frequency converter, the second terminal box, the first terminal box and the electromagnetic coil form the circuit to operate.

(2) The first terminal box and the second terminal box that adopt are outside of online converter and reserve converter, binding post both sides wiring, can solve cable length restriction and the inconvenient problem of wiring than the terminal box of single-sided wiring of current only for the switching is more convenient, further reduces the time of switching work.

(3) A bulb is connected in series with a hot standby power supply on the standby frequency converter to electrify the standby frequency converter, the completion of charging is judged through the extinction of the bulb, the standby frequency converter in a cold standby state is converted into the standby frequency converter in a hot standby state, the starting time of the standby frequency converter is greatly shortened, and the switching time is further shortened.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a circuit diagram of an electromechanical stirring variable frequency system in the prior art;

fig. 2 is a block diagram of a terminal block of an on-line inverter according to the prior art.

The labels in fig. 1-2: the power supply 6, the fuse 3, the isolation transformer 4, the electromagnetic coil 8, the circuit breaker 23, the frequency converter 24, the existing connecting terminal 25, the electromagnetic coil cable 26, the existing grounding terminal cable 27, the existing three-phase power cable 28 and the existing grounding cable 29.

FIG. 3 is a circuit diagram of the electromechanical stirring variable frequency system of the present utility model;

FIG. 4 is a circuit diagram of the present utility model after step 1 after a failure of the on-line converter;

FIG. 5 is a circuit diagram of the present utility model after step 2 after a failure of the on-line converter;

fig. 6 is a schematic diagram of a wiring structure of the second terminal box according to the present utility model.

The labels in fig. 3-6: the on-line frequency converter 1, the standby frequency converter 2, the fuse 3, the isolation transformer 4, the first circuit breaker 5, the power supply 6, the first terminal box 7, the electromagnetic coil 8, the second circuit breaker 9, the second terminal box 10, the box 11, the wiring terminal 12, the upper conductive plate 121, the side conductive plate 122, the lower conductive plate 123, the wire nose 124, the connecting piece 125, the terminal lead 13, the cover 14, the notch 15, the through hole 16, the hot standby power supply 17, the third circuit breaker 18, the bulb 19, the three-phase power supply wire 20, the ground wire 21 and the ground cable 22.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

In the description of the present utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "axial," "radial," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" or "a number" means two or more, unless specifically defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

As shown in fig. 2-6, in a preferred embodiment of the electromechanical stirring variable frequency system with a standby frequency converter according to the present utility model, the electromechanical stirring variable frequency system includes an on-line frequency converter 1 and a standby frequency converter 2, an input end of the on-line frequency converter 1 is sequentially connected with a fuse 3, an isolation transformer 4, a first circuit breaker 5 and a power supply 6, an output end of the on-line frequency converter 1 is sequentially connected with a first terminal box 7 and an electromagnetic coil 8, an input end of the standby frequency converter 2 is connected with a second circuit breaker 9, the second circuit breaker 9 can be connected with the fuse 3 in a switching manner, an output end of the standby frequency converter 2 is connected with a second terminal box 10, and the second terminal box 10 can be connected with the first terminal box 7 in a switching manner.

Further, the rated current of the second circuit breaker 9 is 40A, which is suitable for the load of the standby frequency converter 2.

As shown in fig. 5, further, the first terminal box 7 and the second terminal box 10 each include a box 11, a plurality of connection terminals 12 are disposed in the box 11, the outgoing line of the on-line frequency converter 1 and the lead wire of the electromagnetic coil 8 are connected with two sides of the connection terminal 12 of the first terminal box 7, or a terminal lead wire 13 is disposed between the first terminal box 7 and the second terminal box 10, the terminal lead wire 13 and the lead wire of the electromagnetic coil 8 are respectively connected with two sides of the connection terminal 12 of the first terminal box 7, and the outgoing line of the standby frequency converter 2 and the terminal lead wire 13 are respectively connected with two sides of the connection terminal 12 of the second terminal box 10; compared with the prior terminal box with single-side wiring as shown in fig. 2, the connection at two sides can facilitate the switching operation of the first terminal box 7 and the second terminal box 10, thereby reducing the switching time.

Further, the box 11 includes the lid 14 that can open and shut, and the box 11 both sides are equipped with the wiring mouth, can be through opening the lid 14 after wiring, and the cable can be followed the wiring mouth of both sides and draw out after closing the lid 14, and the circuit switching operation of being convenient for further.

Further, the connection port may be a notch 15 or a through hole 16.

Further, the connection terminal 12 includes an upper conductive plate 121, a side conductive plate 122 and a lower conductive plate 123 that are sequentially connected, and may form a C-shaped structure, where the upper conductive plate 121 and the lower conductive plate 123 are respectively provided with a plurality of wire noses 124, a connection piece 125 is provided between the lower conductive plate 123 and the box 11, the connection piece 125 may use a bolt, and the wire of the wire converter 1 or the standby converter 2, the terminal lead 13 or the lead of the electromagnetic coil 8 may be connected to the connection terminal 12 through the wire noses 124, and are respectively connected through the upper conductive plate 121 and the lower conductive plate 123, so as to further facilitate the circuit switching operation.

Further, the first terminal box 7 and the second terminal box 10 are both located outside the on-line frequency converter 1 and the standby frequency converter 2, and compared with the arrangement inside the on-line frequency converter 1 and the standby frequency converter 2, the wire outlet length of the on-line frequency converter 1 and the standby frequency converter 2 can be increased, so that the wire switching operation is further facilitated.

As shown in fig. 3, the power supply system further comprises a hot standby power supply 17, the hot standby power supply 17 is sequentially connected with a third circuit breaker 18 and a bulb 19, the bulb 19 can be connected in series with the standby frequency converter 2, the standby frequency converter 2 in a cold standby state can be charged by connecting the hot standby power supply 17 in series with the bulb 19 before being started, until the bulb 19 is completely extinguished, the completion of charging of each element of the standby frequency converter 2 can be judged, and the switching time of the standby frequency converter 2 in the hot standby state can be greatly reduced; it is also possible to connect the bulb 19 in series with other frequency converters or switches in the caster system to detect if the other frequency converters are charged.

Further, the power of the bulb 19 is 100W, and the brightness is high, so that the observation is convenient.

The working principle of the electromechanical stirring frequency conversion system is as follows:

as shown in fig. 3 and 6, in normal use, the on-line inverter 1 is made of three-phase four-wire system, that is, a three-phase power line 20 and a ground line 21 of outgoing lines thereof are connected with one side of a connection terminal 12 of the first terminal box 7, a lead wire of the electromagnetic coil 8 and a ground cable 22 are connected with the other side of the connection terminal 12 of the first terminal box 7, the second circuit breaker 9 is in an open state, after the first circuit breaker 5 is closed, the power supply 6 and the isolation transformer 4, the fuse 3, the on-line inverter 1, the first terminal box 7 and the electromagnetic coil 8 form a circuit, dangerous voltages are isolated by the isolation transformer 4, overcurrent protection is performed by the fuse 3, and the on-line inverter 1 controls the variable frequency operation of the electromagnetic coil 8 through the first terminal box 7.

The standby frequency converter 2 adopts a three-phase four-wire system, namely, a three-phase power line 20 and a ground line 21 of outgoing lines are connected with one side of a connecting terminal 12 of the second terminal box 10, one end of a terminal lead 13 and a ground terminal cable 22 are connected with the other side of the connecting terminal 12 of the second terminal box 10, and the other end of the terminal lead 13 is not connected, so that standby switching is realized.

When the on-line frequency converter 1 fails, step 1: as shown in fig. 4, the first circuit breaker 5 is opened to disconnect the on-line inverter 1 from the circuit, connect the bulb 19 to the input end of the standby inverter 2, close the third circuit breaker 18 to charge the hot standby power supply 17 to the standby inverter 2 in the cold standby state, open the third circuit breaker 18 until the bulb 19 is extinguished, disconnect the bulb 19 from the standby inverter 2, and obtain the standby inverter 2 in the hot standby state.

Step 2: as shown in fig. 5, the connection between the fuse 3 and the input end of the on-line frequency converter 1 is disconnected, and the lead wire of the fuse 3 is connected with a second short-circuit device; removing the outgoing line of the line frequency converter 1 from the connecting terminal 12 of the first terminal box 7, connecting the end part of the terminal lead 13 to the connecting terminal 12 of the first terminal box 7, and enabling the terminal lead 13 and the lead of the electromagnetic coil 8 to be respectively positioned at two sides of the connecting terminal 12 of the first terminal box 7; after the first breaker 5 and the second breaker 9 are closed, the power supply 6, the isolation transformer 4, the fuse 3, the standby frequency converter 2, the second terminal box 10, the first terminal box 7 and the electromagnetic coil 8 form a circuit, and at the moment, the on-line frequency converter 1 can be subjected to fault investigation and maintenance by professionals because the on-line frequency converter 1 is separated from the circuit, and the standby frequency converter 2 is used for controlling the frequency conversion operation of the electromagnetic coil 8, so that the downtime and the influence caused by the faults of the on-line frequency converter 1 can be reduced compared with the existing electromechanical stirring frequency conversion system which is not provided with the standby frequency converter 2.

Above-mentioned frequency conversion system has only add reserve converter 2, second circuit breaker 9 and second terminal box 10, when online converter 1 trouble, can need not to troubleshoot the trouble, demolish online converter 1 play line immediately in first terminal box 7, connect the terminal lead 13 of second terminal box 10, and then simplify the operation through the switching of first terminal box 7 and second terminal box 10, compared with the frequency conversion system that current increases a complete standby system, the transformation content on original frequency conversion system is fewer, the required transformation space is fewer, transformation cycle is shorter, the strip line electrical personnel can accomplish the change into during the conticaster overhauls or overhauls, transformation expense is lower.

The frequency conversion system designs the first terminal box 7 and the second terminal box 10 as the external part of the on-line frequency converter 1 and the standby frequency converter 2 and the two sides of the connecting terminal 12 are connected, compared with the existing terminal box which can only be connected on one side, the frequency conversion system can solve the problems of cable length limitation and inconvenient connection, and is more convenient to switch; the standby frequency converter 2 cannot be started in a cold mode, so that a bulb 19 is connected in series to the standby frequency converter 2 to power the standby frequency converter, the starting time of the standby frequency converter 2 is greatly shortened, and the switching time is further shortened.

Through practical tests, the time of fault influence of more than 20 hours can be converted into less than 0.5 hours, the fault detection influence is greatly reduced, the use requirement can be met, the purposes of reducing fault loss and creating benefits are achieved, and the method is convenient to popularize and use.

The above list of detailed descriptions is only specific to practical embodiments of the present utility model, and they are not intended to limit the scope of the present utility model, and all equivalent embodiments or modifications that do not depart from the spirit of the present utility model should be included in the scope of the present utility model.

Claims (6)

1. The utility model provides an electromechanical stirring frequency conversion system of reserve converter, its characterized in that, including online converter (1) and reserve converter (2), the input of online converter (1) has connected gradually fuse (3), isolation transformer (4), first circuit breaker (5) and power (6), and the output of online converter (1) has connected gradually first terminal box (7) and solenoid (8), the input of reserve converter (2) is connected with second circuit breaker (9), second circuit breaker (9) can with fuse (3) switching, the output of reserve converter (2) is connected with second terminal box (10), second terminal box (10) can with first terminal box (7) switching.

2. The electromechanical stirring variable frequency system with the standby frequency converter according to claim 1, wherein the first terminal box (7) and the second terminal box (10) comprise a box body (11), a plurality of connecting terminals (12) are arranged in the box body (11), a wire outlet of the online frequency converter (1) is connected with two sides of the connecting terminals (12) of the first terminal box (7) with a wire outlet of the electromagnetic coil (8), or a terminal wire (13) is arranged between the first terminal box (7) and the second terminal box (10), the terminal wires (13) and the wire outlet of the electromagnetic coil (8) are respectively connected with two sides of the connecting terminals (12) of the first terminal box (7), and the wire outlet and the terminal wire outlet (13) of the standby frequency converter (2) are respectively connected with two sides of the connecting terminals (12) of the second terminal box (10).

3. The electromechanical stirring variable frequency system with the standby frequency converter according to claim 2, wherein the box body (11) comprises a cover body (14) capable of being opened and closed, and wiring ports are formed in two sides of the box body (11).

4. The electromechanical stirring variable frequency system with the standby frequency converter according to claim 2, wherein the wiring terminal (12) comprises an upper conductive plate (121), a side conductive plate (122) and a lower conductive plate (123) which are sequentially connected, the upper conductive plate (121) and the lower conductive plate (123) are respectively provided with a plurality of wire noses (124), and a connecting piece (125) is arranged between the lower conductive plate (123) and the box body (11).

5. An electromechanical stirring frequency conversion system with a standby frequency converter according to claim 1, characterized in that the first terminal box (7) and the second terminal box (10) are both located outside the on-line frequency converter (1) and the standby frequency converter (2).

6. An electromechanical stirring variable frequency system with a standby frequency converter according to any of claims 1-5, characterized in that it comprises a hot standby power supply (17), said hot standby power supply (17) being connected in turn with a third circuit breaker (18) and a bulb (19), said bulb (19) being able to be connected in series with the standby frequency converter (2).