CN2817209Y

CN2817209Y - Frequency conversion start hydraulic press multi motor device

Info

Publication number: CN2817209Y
Application number: CN 200520026783
Authority: CN
Inventors: 陈福祥
Original assignee: Tianjin Tianduan Press Co Ltd
Current assignee: Tianjin Tianduan Press Co Ltd
Priority date: 2005-07-26
Filing date: 2005-07-26
Publication date: 2006-09-13
Anticipated expiration: 2015-07-26

Abstract

The utility model provides a frequency conversion start hydraulic press multi-motor device. The utility model is characterized in that an alternating current frequency converter is electrically connected among multiple motors driving a hydraulic press main oil pump and a power switch; the power input end of the alternating current frequency converter is electrically connected with the power switch, and the output end thereof is connected with each motor through a frequency conversion start switch of the alternating current frequency converter; the power switch is also electrically connected with each motor through a power frequency run switch of the alternating current frequency converter, and the control end of the alternating current frequency converter is electrically connected with the output ends of a PC single-chip machine and a PLC programmable controller of the hydraulic press. After the multiple motors of the hydraulic press main oil pump gradually regulate the supply frequency to 50Hz power frequency orderly from low frequency to high frequency, the power supply circuit of commercial power is switched on. The device solves the problem that the multiple alternating current asynchronous motors with high power are difficult to start, and the device largely enhances the starting performance of the motors. Besides, the utility model also has the advantages of simple structure and easy production.

Description

Variable frequency starting hydraulic press multiple motors device

Technical field

The utility model relates to a kind of hydraulic press HYDRAULIC CONTROL SYSTEM technical field that is used for, especially a kind of variable frequency starting hydraulic press multiple motors device.

Background technology

At present, the high power AC asynchronous motor on the high power hydraulic machine is commonly the Starting mode of star triangle start or single-circuit transformer reduction voltage.The shortcoming of this traditional Starting mode is that staring torque is little, only is specified 30%-50%; Starting current is big, for the 3.5-7 of rated current doubly.Therefore, traditional Starting mode is very limited large hydraulic press user's power supply capacity, often because excessive the causing of starting current starts difficulty.

Summary of the invention

The utility model is for solving the technical problem that exists in the known technology; And provide a kind of variable frequency starting hydraulic press multiple motors device that improves the motor start-up performance.

The technical scheme that the utility model is taked for the technical problem that exists in the solution known technology is:

A kind of variable frequency starting hydraulic press multiple motors device, form by the hydraulic press Hydraulic Power Transmission System of Programmable Logic Controller PLC and single-chip microcomputer PC control, the multiple motors that is connected with Hydraulic Power Transmission System, the mains switch that is electrically connected with multiple motors, also be electrically connected with 1 AC converter between described multiple motors and the mains switch; Power input R, the S of AC converter, T electric connection of power supply switch, the variable frequency starting switch that output U, the V of AC converter, W reach by AC converter is electrically connected the input of multiple motors; Mains switch also is electrically connected the input of multiple motors by the power frequency operation switch of AC converter; Described variable frequency starting switch and power frequency operation switch are the mechanical interlocking contactor; The control end of described AC converter is electrically connected the output of PLC Programmable Logic Controller.

The utility model can also adopt following technical measures:

Described motor is 4, is respectively M1, M2, M3, M4; Described variable frequency starting switch is 4, is respectively KM1, KM3, KM5, KM7; Described power frequency operation switch is 4 also, is respectively KM2, KM4, KM6, KM8; The control end of described AC converter is respectively soft and opens/and H/A, the soft M1 of opening input H1, the soft M2 of opening input H2, the soft M3 of opening input H3, the soft M4 of opening input H4, COM and frequency converter move/stop input RUN, COM automatically.

Advantage and the good effect that the utlity model has are: owing to be electrically connected with AC converter by Programmable Logic Controller PLC control between the multiple motors of hydraulic press and mains switch, successively multiple motors is regulated from low to high gradually the frequency of supply of motor stator, to the 50Hz power frequency, switch to the mains-supplied circuit, greatly reduce starting current (starting current is reduced to 1-1.25 times of rated current), improved staring torque 150%; The utility model also has advantage simple in structure, that be easy to make in addition.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is an AC converter circuit connection diagram of the present utility model.

Among the figure: 1, PC single-chip microcomputer; 2, PLC Programmable Logic Controller; 3, PROFIBUS communication bus; 4, AC converter; 5, motor M1-M4; 6, mechanical interlocking contactor; 7, mains switch.

Embodiment

For further understanding summary of the invention of the present utility model, characteristics and effect, exemplify following examples now, and conjunction with figs. is described in detail as follows:

See also Fig. 1, the motor 5 of hydraulic press main oil pump has four, is respectively M1, M2, M3, M4.In order to reduce the starting current of motor 5, between four motor and mains switch 7, be electrically connected with AC converter 4.In order to switch to the mains-supplied circuit after starting, between AC converter and each motor, also add mechanical interlocking contactor 6.The control end of AC converter 4 is by the output of PROFIBUS communication bus 3 electrical connection PC single-chip microcomputers 1 and PLC Programmable Logic Controller 2, and PLC can control four motor frequency changes startups successively like this, until the normal power frequency running of whole motor.AC converter is connected as shown in Figure 2 with the circuit of each motor, power input R, the S of AC converter 4, T are connected with the 380V power supply with KMO by the QFO of mains switch 7, output U, the V of AC converter, W can realize each motor variable frequency starting respectively like this by M1, M2, M3 and M4 that variable frequency starting K switch M1, KM3, KM5 and the KM7 of AC converter is electrically connected motor 5 respectively; Motor M1, M2, M3 and M4 also respectively by power frequency operation K switch M2, KM4, KM6 and the KM8 of AC converter, are electrically connected the 380V power supply through mains switch QF1 in addition; In order to ensure the switching of variable frequency starting and power frequency operation switch, each motor 5 is provided with the mechanical interlocking contactor 6 of KM1 and KM2, KM3 and KM4, KM5 and KM6, KM7 and KM8; Soft the opening of the control end of AC converter/H/A, the soft M1 of opening input H1, the soft M2 of opening input H2, the soft M3 of opening input H3, the soft M4 of opening import H4, COM (KAO), move/stop the output that KAO (RUN, COM) all is electrically connected the PLC Programmable Logic Controller automatically.

Among the utility model embodiment: AC converter 4 is selected the Ai Mosheng model; Mechanical interlocking contactor 6 selects the sky and water 213, the CJX4-D model.

Claims

1. variable frequency starting hydraulic press multiple motors device, form by the hydraulic press Hydraulic Power Transmission System of Programmable Logic Controller PLC and single-chip microcomputer PC control, the multiple motors that is connected with Hydraulic Power Transmission System, the mains switch that is electrically connected with multiple motors, it is characterized in that: also be electrically connected with 1 AC converter between described multiple motors and the mains switch; Power input R, the S of AC converter, T electric connection of power supply switch, output U, the V of AC converter, W are electrically connected the input of multiple motors by the variable frequency starting switch of AC converter; Mains switch also is electrically connected the input of multiple motors by the power frequency operation switch of AC converter; Described variable frequency starting switch and power frequency operation switch are the mechanical interlocking contactor; The control end of described AC converter is electrically connected the output of PLC Programmable Logic Controller.

2. variable frequency starting hydraulic press multiple motors device according to claim 1, it is characterized in that: described motor is 4, is respectively M1, M2, M3, M4; Described variable frequency starting switch is 4, is respectively KM1, KM3, KM5, KM7; Described power frequency operation switch is 4 also, is respectively KM2, KM4, KM6, KM8; The control end of described AC converter is respectively soft and opens/and H/A, the soft M1 of opening input H1, the soft M2 of opening input H2, the soft M3 of opening input H3, the soft M4 of opening input H4, COM and frequency converter move/stop input RUN, COM automatically.