JPS595028Y2 - Control device for lifting electromagnet - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an improvement of a control device for a lifting electromagnet.

FIG. 1 is a circuit diagram showing a conventional control device of this type.
1 and 2 in the figure are rectifiers, each of which converts three-phase AC power into DC.

Among these, the output of the rectifier 1 is the electromagnetic contactor contact 3a.

It is supplied to the lifting electromagnet 7 through 3b.

Further, the rectifier 2 is configured to supply output to the battery 6 through circuit breakers 5a and 5b.

An electromagnetic contactor contact 4 is connected between the positive output ends of both rectifiers 1 and 2, and the positive output end of the rectifier 2 is connected to an operating voltage compensator 9.

This operating voltage compensator 9 is connected to the electromagnetic contactor coil 8 .

One end of this electromagnetic contactor coil 8 is connected to the negative output ends of the rectifiers 1 and 2 through a breaker 5C.

Next, the operation of the control device shown in FIG. 1 will be briefly described. When three-phase AC power is supplied to the input terminals of rectifiers 1 and 2, it is rectified into DC.

The output voltage of this rectifier 1 is the electromagnetic contactor contacts 3a and 3b.
.

4. Applied to the circuit breaker 5C.

Further, the output voltage of the rectifier 2 is applied to the circuit breakers 5a, 5b and the operating voltage compensator 9.

In this state, the magnetic contactor contact 4 is energized by another signal (not shown) and the normally closed contact is open.

At this time, when the circuit breakers 5a to 5C are turned on, the storage battery 6 starts charging by the output of the rectifier 2 through the circuit breakers 5a and 5b, and the electromagnetic contactor coil 8 of the operating voltage compensator 9 also receives a magnet-on signal (not shown). ).

The electromagnetic contactor contacts 3a and 3b, which are controlled to open and close by the electromagnetic contactor coil 8, are closed, and the lifting electromagnet 7 generates an attractive force.

An operating voltage compensator 9 is inserted into the operating circuit, and when the charging voltage is higher than the operating voltage, this device is used to lower the voltage. The higher of the voltage and battery voltage is applied as the operating voltage.

Since the charging voltage is normally higher than the battery electromotive force, it is supplied from this, but when it becomes lower, it is supplied from the battery 6.

All of this is done without switching, and the magnetic contactor contact 4 is turned on and off at this time (it is closed when the battery is in use with another signal), and objects are not dropped when the magnet attraction signal is activated (not shown). That's what I do.

In such conventional control devices, when the difference between the battery charging voltage and the operating voltage is large, many parts must be used to adjust the operating voltage compensator, and its electrical reliability, installation space, and assembly are limited. This was unreasonable, and when using special equipment to solve this problem, there was a problem in how to obtain it.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional technology.The battery charging circuit and the operating circuit are made independent, and one pole of this operating voltage is connected to the same polarity as the operating voltage taken out from the intermediate terminal of the battery. Connect the poles through a diode,
By setting both voltages to a high voltage in the operating circuit under normal conditions, battery discharge is eliminated, and the reverse resistance effect of the diode prevents the battery from being charged.In the event of a power outage, etc., the battery can be used without switching. An object of the present invention is to provide a control device for a lifting electromagnet that can smoothly supply power to the lifting electromagnet.

Hereinafter, the control device for a lifting electromagnet of this invention will be explained based on the drawings. FIG. 2 is a circuit diagram showing one embodiment thereof, and in this FIG. The same parts are given the same reference numerals, and the explanation thereof will be omitted, and the different points will be mainly described.

In FIG. 2, a current summoning device 10 is newly provided in addition to the rectifying devices 1 and 2.

This rectifier 10 rectifies a three-phase AC power source as input,
Its positive output terminal is connected to a predetermined intermediate terminal of the battery 6 through a diode 11 of opposite polarity and a breaker 5C.

A negative output terminal of the rectifier 10 is connected to the negative electrode of the battery 6.

Further, an electromagnetic contactor coil 8 is connected between the cathode of the diode 11 and the negative side of the battery 6.

Thus, the rectifier 10, the diode 11. Breaker 5
c and the electromagnetic contactor coil 8 form an operating circuit.

Then, the voltage on the cathode side of the diode 11 is made higher than the voltage of the battery 6 to cut off the discharge of the battery 6, and the reverse resistance effect of the diode 11 is utilized to prevent the battery from being charged by the operating voltage.

Next, the operation of this invention configured as above will be explained.

In normal times, by closing the circuit breakers 5a to 5C, the battery 6 is charged by the rectifier 2, the operation circuit is powered by the rectifier 10, and the lifting electromagnet 7 is connected to the switch provided in this operation circuit (Fig. (not shown) performs the suction-release operation.

As a result, the electromagnetic contactor contacts 3a and 3b perform operations of closing when suctioning and opening when releasing, and perform operations of attracting and releasing the suspended object.

During suction in this state, if the supply of operating voltage is cut off due to a power outage, etc., it is necessary to continuously close the electromagnetic contactor contacts 3a and 3b to cause the lifting electromagnet 7 to perform the suction operation. be.

Therefore, the closed circuit of the breaker 5C, the diode 11, the electromagnetic contactor coil 8, and the negative electrode of the battery 6 is energized from the intermediate terminal of the battery 6, and the electromagnetic contactor coil 8 is excited, and the electromagnetic contactor contacts 3a and 3b are energized. is closed.

Therefore, from the positive electrode of the battery 6, the circuit breaker 5a - the electromagnetic contactor contact 4 - the electromagnetic contactor contact 3a - the lifting electromagnet 7 -
A closed circuit from electromagnetic contactor contact 3b to breaker 5b to the negative electrode of battery 6 is formed.

Based on this, the suspension electromagnet 7 can be energized from the battery 6 to perform a suction operation.

The electromagnetic contactor 4 operates in response to another signal (not shown), is normally closed, and is opened by excitation of an electromagnetic contactor coil (not shown).

In addition, in the operation circuit, the electromagnetic contactor contacts 3a, 3b,
and inserted into other equipment or main circuits that operate 4.

Note that other devices are omitted for convenience of explanation.

In addition, in the embodiment shown in FIG. 2, a three-phase rectifier was shown, but
Other rectification schemes are also possible.

Furthermore, it is also possible to use a diode for the electromagnetic contactor 4, and it goes without saying that the circuit breakers 5a to 5C may be replaced with switches or may not be used.

As described above, according to this invention, a charging circuit and an operating circuit are provided, and the circuit is constructed using the forward and reverse resistance of diodes, so that charging is possible at a high voltage while the operating voltage is low. General-purpose equipment can be used, and even in the event of a power outage, power can be continuously supplied to the operating circuit, so there is no need to use special equipment or unreliable parts. The circuit can satisfy the functions safely and inexpensively.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional lifting electromagnet control device, and FIG. 2 is a circuit diagram showing an embodiment of the lifting electromagnet control device of this invention. 1, 2.10... rectifier, 3a, 3b, 4
... Magnetic contactor contact, 5a to 5C... Breaker, 6
...Battery, 7.. Hanging electromagnet, 8.. Magnetic contactor coil, 11.. Diode. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (5)

[Scope of utility model registration request] (1) A first rectifier that supplies power to the hanging electromagnet, a second rectifier that supplies charging force to the battery, and the first rectifier that supplies power to the battery.
and a third rectifier independent of the circuit connected to the output end of the second rectifier, the output side of the third rectifier and the battery having a potential lower than the output voltage of the third rectifier. A diode is connected in the opposite direction between the intermediate terminals of the battery to cut off discharge of the battery, and a diode is connected between the output terminals of the third rectifier when the third rectifier is normal. an electromagnetic contactor coil that supplies and cuts off output to the lifting electromagnet, and is excited from an intermediate terminal of the battery when the third rectifier is cut off to supply exciting current from the battery to the lifting electromagnet; A control device for a lifting electromagnet. (2) A utility model registration request characterized by having a normally closed electromagnetic contactor contact connected between the positive output end of the first rectifier and the positive output end of the second rectifier. A control device for a lifting electromagnet according to scope 1. (3) The suspension according to claim 1 of the utility model registration claim, characterized in that a diode is connected between the positive output terminal of the first rectifier and the positive output terminal of the second rectifier. Upper electromagnet control device. (4) The control device for a lifting electromagnet according to claim 1, which is a utility model, and further comprises a breaker between the second rectifier and the battery and between the intermediate terminal of the battery and the diode. (5) A control device for a lifting electromagnet according to claim 1, which is characterized by having a switch between the second current summoning device and the battery and between the intermediate terminal of the battery and the diode.