Power supply system of excitation system of electromagnetic bridge crane

Abstract

The utility model discloses a power supply system of an electromagnetic bridge crane excitation system, which comprises a power supply module, a rectification unit and contactors additionally arranged at the V end and the W end of the secondary side of an excitation transformer, normally open contacts 5 and 8 of the contactors are respectively connected with the V end and the W end, normally closed contacts 1 and 4 of the contactors are respectively connected with P22 and N22 of an input power supply, and the rectification unit is connected with the rectification unit. A contact 9 of the contactor is connected with a P + terminal, and a contact 12 of the contactor is connected with an N-terminal; the P + terminal and the N-terminal are respectively connected to the L1 end and the N end of the power supply module, and output direct current 24V after being input by a V-end alternating current power supply and a W-end alternating current power supply; the P + terminal and the N-terminal are connected to the rectification unit, and the AC power supply at the V end and the W end outputs 220V DC after rectification. The excitation system is powered by the alternating-current power supply under the condition that the electromagnetic crown block normally works for excitation, and the direct-current power supply continuously supplies power to the system when the alternating-current power supply goes wrong, so that normal production of the electromagnetic crown block of a medium plate factory is ensured.

Description

TECHNICAL FIELD

[0001] The utility model belongs to crane excitation system technical field especially relates to a power supply system of electromagnetic bridge crane excitation system. BACKGROUND

[0002] The crown block as a kind of key special equipment plays a pivotal role in the production process of medium plate factory, is mainly responsible for the receiving and dispatching of steel plate on rolling line task.Its safe, reliable and stable operation state is crucial to maintain the normal rolling rhythm of entire production line.However, the crown block is also a kind of equipment with frequent accidents in metallurgical industry.Therefore, it is particularly urgent to ensure that the crown block has reliable and stable control system in normal production operation.

[0003] At present, finished product span and fire cutting span are respectively equipped with four electromagnetic crown blocks.The excitation system control loop power supply mode of these electromagnetic crown blocks relies on battery set in ground magnetic preservation house, and all electromagnetic crown blocks in the same span are provided with control power supply of excitation system by the centralized DC slide wire.However, this power supply mode has many potential problems.Once battery set is damaged or needs to be overhauled, or DC slide wire fails, and the current collection slide block contact is poor, etc., the excitation system of electromagnetic bridge crane will be in a paralyzed state, and cannot work normally.Only when these problems are properly solved, electromagnetic crane can be put into operation again, which will undoubtedly cause serious restriction to the production rhythm of production line. SUMMARY

[0004] In view of the problems in prior art, the utility model provides a power supply system of electromagnetic bridge crane excitation system, which can realize that electromagnetic crown block is supplied with power by AC power supply under normal working excitation condition.When AC power supply has problems, DC power supply continuously supplies power to the system, to ensure the normal production of electromagnetic crown block in medium plate factory.

[0005] The utility model is realized as follows, a power supply system of electromagnetic bridge crane excitation system, including power module, rectifier unit and the contactor of installing at the V, W end of excitation transformer secondary side, the always open point 5, 8 of contactor is connected with V end and W end respectively, the normally closed point 1, 4 of contactor is connected with P22 and N22 of input power supply respectively, the contact 9 of contactor is connected with P+ wiring end, the contact 12 of contactor is connected with N-wiring end;

[0006] P+ wiring end, N-wiring end are connected with L1 end and N end of power module respectively, and output DC 24V for PLC power supply after V, W end AC power supply input;

[0007] The P+ terminal and the N-terminal are connected to a rectifier unit, and an AC power supply of V and W is rectified to output a DC 220V control excitation, demagnetization and magnetic separation switch.

[0008] Further, the rectifier unit comprises a bridge rectifier circuit composed of four diodes V1, V2, V3 and V4.

[0009] Further, the diode V1 is connected in parallel with a capacitor C1 and a resistor R1; the diode V2 is connected in parallel with a capacitor C2 and a resistor R2; the diode V3 is connected in parallel with a capacitor C3 and a resistor R3; and the diode V4 is connected in parallel with a capacitor C4 and a resistor R4.

[0010] The utility model has the advantages and technical effects that: due to the above technical scheme, AC power supply is used for the excitation system of the electromagnetic crown block in the normal working excitation condition. When the AC power supply has a problem, the DC power supply continuously supplies power to the system, ensuring the normal production of the electromagnetic crown block in the plate factory. The problem that the excitation system of the electromagnetic bridge crane cannot work normally when problems such as battery pack damage, maintenance, DC slide wire fault and poor contact of the current collection slide block occur is solved. Thus, the system power supply stability is improved, and the equipment operation is ensured to be normal.

[0011] Through the transformation, the electromagnetic crane system AC power supply is rectified to supply power to the system, the normal working condition is solved, the excitation system is powered by the equipment itself AC power supply, the equipment power supply stability is improved, and the normal operation of the plate production process is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 The utility model embodiment provides a system circuit diagram. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical scheme and advantages of the utility model more clear, the utility model is further described in detail in combination with embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model, and are not used to limit the utility model.

[0014] It should be noted that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the utility model.

[0015] As Figure 1As shown, the application provides a power supply system of an electromagnetic bridge crane excitation system, comprising a power module, a rectifier unit and a contactor installed at the secondary side V, W of the excitation transformer, the normally open points 5, 8 of the contactor are connected with the V end and the W end respectively, the normally closed points 1, 4 of the contactor are connected with the P22 and N22 of the input power source respectively, the contact 9 of the contactor is connected with the P+ connection terminal, and the contact 12 of the contactor is connected with the N- connection terminal;

[0016] The P+ connection terminal and the N- connection terminal are connected with the L1 end and the N end of the power module respectively, and the V, W end AC power input is output as DC 24V for PLC power supply;

[0017] The P+ connection terminal and the N- connection terminal are connected with the rectifier unit, and the V, W end AC power is output as DC 220V for excitation, demagnetization and magnetic separation switch control after rectification.

[0018] Further, the rectifier unit comprises a bridge rectifier circuit composed of four diodes V1, V2, V3 and V4.

[0019] Further, the diode V1 is connected in parallel with the capacitor C1 and the resistor R1; the diode V2 is connected in parallel with the capacitor C2 and the resistor R2; the diode V3 is connected in parallel with the capacitor C3 and the resistor R3; and the diode V4 is connected in parallel with the capacitor C4 and the resistor R4.

[0020] Principle: The AC contactor 7KC coil is connected to the secondary side V, W of the excitation transformer, the normally open point of the contactor is connected to the V, W AC power supply, one way is connected to the input end of the rectification module, and the other way is connected to the input end of the power module. The normally closed point of the contactor is connected to the DC power supply through the DC slide wire, and the lower end is connected to the input end of the power module. The electromagnetic overhead crane realizes the use of AC power supply for excitation system in the daily excitation system work, thereby ensuring the normal production of the medium plate.

[0021] Due to the above technical scheme, the excitation system of the electromagnetic overhead crane uses AC power supply in the normal working excitation condition. When the AC power supply fails, the DC power supply continuously supplies power to the system, ensuring the normal production of the electromagnetic overhead crane in the medium plate factory. The problem that the electromagnetic bridge crane excitation system cannot work normally when problems such as battery pack damage, maintenance, DC slide wire fault, and poor contact of the collector slide block occur is solved. Thus, the stability of system power supply is improved, and the normal operation of the equipment is ensured.

[0022] Through this transformation, the electromagnetic crane system AC power supply is used to supply power to the system after rectification, which solves the problem that the excitation system is powered by the DC slide wire in the normal working condition, and improves the stability of the equipment power supply, ensuring the normal operation of the medium plate production process.

[0023] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power supply system for an electromagnetic bridge crane excitation system, characterized in that, It comprises a power module, a rectifier unit and a contactor installed at the secondary side V, W of the excitation transformer, the normally open points 5, 8 of the contactor are connected with the V end and the W end respectively, the normally closed points 1, 4 of the contactor are connected with the P22 and N22 of the input power source respectively, the contact 9 of the contactor is connected with the P+ terminal, the contact 12 of the contactor is connected with the N- terminal; The P+ terminal and the N- terminal are connected with the L1 end and the N end of the power module respectively, and the V, W end AC power input is outputted as DC 24V for the PLC power supply; The P+ terminal and the N- terminal are connected with the rectifier unit, and the V, W end AC power is outputted as DC 220V to control the excitation, demagnetization and magnetic separation switch after rectification.

2. The power supply system of an electromagnetic bridge crane excitation system according to claim 1, characterized in that, The rectifier unit comprises a bridge rectifier circuit composed of four diodes V1, V2, V3 and V4.

3. The power supply system of an electromagnetic bridge crane excitation system according to claim 2, characterized in that, The diode V1 is connected with the capacitor C1 and the resistor R1 in parallel, the diode V2 is connected with the capacitor C2 and the resistor R2 in parallel, the diode V3 is connected with the capacitor C3 and the resistor R3 in parallel, and the diode V4 is connected with the capacitor C4 and the resistor R4 in parallel.

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