CN212752156U

CN212752156U - Special frequency converter for hoisting

Info

Publication number: CN212752156U
Application number: CN202021616751.3U
Authority: CN
Inventors: 王鹏举; 彭博成; 罗杰
Original assignee: Yates Shenzhen Technology Co ltd
Current assignee: Yates Shenzhen Technology Co ltd
Priority date: 2020-08-06
Filing date: 2020-08-06
Publication date: 2021-03-19
Anticipated expiration: 2030-08-06

Abstract

The utility model discloses a special type converter of jack-up, including the 380V power, the 380V power concatenates with converter VVVF input through circuit breaker QF1 and links to each other, and circuit breaker QF1 connects to each other with phase sequence protector FX and circuit breaker QF2 and connects to each other, converter VVVF connects to each other with the output signal end of remote control unit and local control device, converter VVF output and AC contactor KM1 input concatenate and link to each other, AC contactor KM1 output links to each other with thermal relay FR1 input, thermal relay FR1 output links to each other with driving main hook M-1, the utility model discloses structure scientific and reasonable, convenience safe in utilization, converter VVVF through remote control unit and local control device to converter VVF control to carry out the frequency conversion power supply to driving main hook M-1, realized the motor steady start, the effect that the starting current does not have an impact, and the frequent starting current is small, so that the motor is effectively protected, and meanwhile, the starting torque is large, so that a motor which is a little smaller can be selected.

Description

Special frequency converter for hoisting

Technical Field

The utility model relates to a frequency conversion technology field specifically is jack-up special type converter.

Background

The core of the frequency conversion technology is a frequency converter, the automatic adjustment of the running speed rate of a motor is realized by converting the power supply frequency, the fixed grid frequency of 50Hz is changed into the variable frequency of 30-130 Hz, meanwhile, the adaptive range of the power supply voltage reaches 142-270V, the problem that the work of an electric appliance is influenced due to the instability of the grid voltage is solved, and the technology for realizing alternating current control by changing the alternating current frequency is called the frequency conversion technology;

however, the starting current of a hoisting motor in the current market is large, the starting torque requirement is high, the motor control needs to be matched with a band-type brake system for control, the hoisting motor needs to be started and stopped frequently, the motor is easy to burn when the hoisting motor is started and stopped frequently at power frequency, the starting torque requirement is high, and therefore the motor can be selected relatively large generally, and unnecessary energy consumption loss is caused.

SUMMERY OF THE UTILITY MODEL

The utility model provides a jack-up special type converter, it is big to put forward the hoisting motor starting current on the existing market among the above-mentioned background of can effectively solving, and the starting torque demand is high, and electric machine control needs to cooperate band-type brake system to control, and hoisting motor need frequently open and stop, and the power frequency frequently opens and stops and burn the motor easily, and the starting torque demand is high, so the motor generally can select bigger, causes the problem of unnecessary energy consumption loss.

In order to achieve the above object, the utility model provides a following technical scheme: the hoisting special frequency converter comprises a 380V power supply, wherein the 380V power supply is connected with the VVVF input end of the frequency converter in series through a circuit breaker QF1, and meanwhile, a circuit breaker QF1 is connected with a phase sequence protector FX and a circuit breaker QF2 in parallel;

the frequency converter VVVF is connected with output signal ends of the remote control device and the local control device in parallel;

the output end of the frequency converter VVVF is connected with the input end of an alternating current contactor KM1 in series, the output end of an alternating current contactor KM1 is connected with the input end of a thermal relay FR1, and the output end of a thermal relay FR1 is connected with a driving main hook M-1;

the output end of the breaker QF2 and the output end of the frequency converter VVVF are connected with the input end of an alternating current contactor KM2 in parallel, the output end of the alternating current contactor KM2 is connected with the input end of a thermal relay FR2, and the output end of the thermal relay FR2 is connected with a band-type brake motor M-2.

According to the technical scheme, a current transformer is connected in parallel between the output end of the frequency converter VVVF and the alternating current contactor KM1, and the current transformer is a digital display type electronic watch.

According to the technical scheme, the output end of the frequency converter VVVF and the alternating current contactor KM2 are in interlocking control, and the alternating current contactor KM1 and the alternating current contactor KM2 are in interlocking control.

Compared with the prior art, the beneficial effects of the utility model are that: the utility model has the advantages of being scientific and reasonable in structure, convenient safe in utilization, in normal use, through closed circuit breaker QF1, for converter VVVF circular telegram, circuit breaker QF2 and phase sequence protector FX all get electric, phase sequence protector FX can judge the phase sequence mistake this moment, prevent motor wrong rotation, and closed circuit breaker QF2, converter VVVF controls converter VVVVF through remote control unit and local control device this moment, thereby carry out the frequency conversion power supply to driving main hook M-1, the motor steady start has been realized, the effect that the starting current does not have the impact, and frequently the starting current is little, effectively protect the motor, starting torque is big simultaneously, can select little motor, and when needing power frequency control, through remote control unit and local control device to converter VVVF control, converter VV gives the alternating current signal that alternating current contactor KM2 closed and disconnected, can control whether alternating current contactor KM2 is closed this moment, further realize the interactive use of power frequency and frequency conversion.

Drawings

The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention, and together with the description serve to explain the invention and not to limit the invention.

In the drawings:

fig. 1 is a schematic diagram of the circuit structure of the present invention;

reference numbers in the figures: 1. a remote control device; 2. a local control device; 3. a current transformer.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.

Example (b): as shown in fig. 1, the utility model provides a technical scheme, jack-up special type converter, including the 380V power, the 380V power concatenates with converter VVVF input through circuit breaker QF1 and links to each other, and circuit breaker QF1 connects in parallel with phase sequence protector FX and circuit breaker QF2 simultaneously;

the frequency converter VVVF is connected with the output signal ends of the remote control device 1 and the local control device 2 in parallel;

According to the technical scheme, a current transformer 3 is connected in parallel between the output end of the frequency converter VVVF and the alternating current contactor KM1, and the current transformer 3 is a digital display type electronic watch.

The utility model discloses a theory of operation and use flow: in normal use, the frequency converter VVVF is electrified by closing the breaker QF1, the breaker QF2 and the phase sequence protector FX are electrified, the phase sequence protector FX can judge phase sequence errors at the moment and prevent the motor from rotating mistakenly, the breaker QF2 is closed, the frequency converter VVVF controls the frequency converter VVVF through the remote control device 1 and the local control device 2 at the moment to realize the line number and power supply control on the alternating current contactor KM1, so that the frequency conversion power supply is carried out on the traveling crane main hook M-1, the motor is stably started, the starting current has no impact effect, the frequent starting current is small, the motor is effectively protected, the starting torque is large, a small motor can be selected, when power frequency control is needed, the frequency converter VVVF is controlled through the remote control device 1 and the local control device 2, and the frequency converter VVVVF gives alternating current signals for the on and off of the alternating current contactor KM2, at the moment, the alternating current contactor KM2 can be controlled to be closed or not, the interactive use of power frequency and frequency conversion is further realized, and the simultaneous rotation of the driving main hook M-1 and the band-type brake motor M-2 can be prevented by interlocking.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. Jack-up special type converter, including 380V power, its characterized in that: the 380V power supply is connected with the VVVF input end of the frequency converter in series through a breaker QF1, and meanwhile, a breaker QF1 is connected with a phase sequence protector FX and a breaker QF2 in parallel;

the frequency converter VVVF is connected with output signal ends of the remote control device (1) and the local control device (2) in parallel;

2. Hoisting-only frequency converter according to claim 1, characterized in that a current transformer (3) is connected in parallel between the output of the frequency converter VVVF and the ac contactor KM1, the current transformer (3) being a digital electronic watch.

3. Hoisting-only frequency converter according to claim 1, characterized in that the output of the frequency converter VVVF is interlocked with an ac contactor KM2, and the ac contactor KM1 is interlocked with an ac contactor KM 2.