JPS58186394A - Dc motor reverse rotation operating circuit - Google Patents

Abstract

PURPOSE:To reduce connecting wirings between used parts and DC motor reverse rotation operating circuit by providing a circuit connecting a diode to the connecting point of a microswitch in a DC motor control circuit used for a deicing plug and interlocking a cam. CONSTITUTION:A DC motor 1 which is used for a deicing plug of a water pipe is provided in a housing, connected to a control box 19, in which a rotating direction changeover switch 13 is provided, a device which has a microswitch 14 and diodes 15, 16 is mounted on a cam 12 which is connected to a valve, and rotated by a motor 1. The cam 12 is rotated in a direction S through the motor 1 by operating the switch 13, stopped by the operation of the microswitch 14, and the switch 13 is changed at the reversely rotating time. Accordingly, only one microswitch is used, only two wirings to the box 19 can be used, thereby largely simplifying the structure.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a DC motor reversing operation circuit that is inexpensively constructed and particularly suitable for remote control.

For example, in regions with extremely cold winters, there are so-called antifreeze plugs that drain water from branch pipes in advance to prevent water pipes from bursting due to freezing at night. This antifreeze plug is generally placed underground several tens of centimeters from the ground, and is manually operated.
Type 1 is electrically operated, but especially antifreeze valves that use a ball valve and are driven by a motor to move the valve 90 degrees, when draining water, rotate the valve 90 degrees. The water in the branch pipe is discharged underground from the drain hole by blocking the passage with the main pipe and communicating the branch pipe with the drain hole. In addition, when the main pipe and the branch pipe are to be communicated with each other the next morning, the motor is reversed to return the pulp 90 degrees. Since the motor is connected to the pulp via a reduction gear or the like, it is generally installed outdoors, whereas an operation panel is installed indoors and connected to the motor by a conductive wire, so that it can be remotely controlled from indoors. The DC motor reverse operation circuit according to the present invention is extremely suitable as an operation circuit for such an antifreeze plug.

Conventionally, this type of operating circuit has been constructed as shown in FIG. In Fig. 1, 1 is a DC motor, 2 is a cam that rotates in conjunction with the rotation of the motor, 3 is a changeover switch, 4 and 5 are microswitches, 6 and 7 are indicator lamps,
8 represents a box, which contains the items within the frame.

The DC motor and the cam 2 are connected via a reduction gear etc., and the 1 cam 2 is made of, for example, the whole pulp (
(not shown).

In the conventional example configured in this way, the changeover switch 3 has contacts α-d and b-f as shown in the figure.

When c-A is connected, the current passes through the micro switch 4 through d→a→h −+ of the changeover switch 3.
It passes through f, passes through the motor, passes h→C of switch 3, and reaches e, so the motor rotates.

The rotation of this motor causes the cam 2 to rotate in the S direction, pushing the contact arm k of the switch 4 and disconnecting the no k.
-1 is connected. At this point, the motor stops rotating and the indicator lamp 7 lights up. In this state,
If the pulp directly connected to cam 2 is open, indicator lamp 7
It becomes a trap to display "Pulp Open". Next, to close the pulp, change the changeover switch 3 and contact α-e,
Connect h-g, c-t.

At this time, the (2) current passes through the microswitch 5's loop → m, passes through the selector switch 3's e-+α → b → da, passes through the motor 1, and passes through the switch 3's t → C to reach e. Therefore, the motor 1 rotates in the reverse direction, and in conjunction with this, the cam 2 rotates in the T direction, pushing the contact arm of the switch 5 to disconnect the lume. Connect. At this point, the motor 1 stops rotating, the indicator lamp 7 goes out, and the indicator lamp 6 lights up.

The pulp directly connected to the cam is closed.

However, as is clear from the figure, this conventional example requires two microswitches 4 and 5, and in addition, seven conductive wires are connected between the hunt roll box 8 installed indoors and the pulp installed outdoors. (East line or 7-core cable, etc.), which had the disadvantage of being extremely expensive.

However, if the indicator lamps 6.7 are removed, there will be five core wires.

The present invention improves the drawbacks of the conventional example described above, and requires only one microswitch, and can be used as a couple for connecting indoors and outdoors.
The present invention provides an inexpensive DC motor reverse operation circuit that can use core wires. Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 2 shows an embodiment of the present invention, in which 12 is a cam that rotates in conjunction with the rotation of the DC motor 1) 13 is a changeover switch that switches the polarity of the DC power supply applied to the DC motor 1; 14 is a microswitch in which the contact arm h is pushed by the rotation of the cam 12, and one of the two contacts D or B is opened; I5 and 16 are diodes; are connected to contacts D and B, respectively, and the other terminals are connected to each other. Micro switch 14 and diode 15°16
The circuit consisting of is connected in series with the DC motor 1 and connected to the secondary side contact of the changeover switch 13. 17 and 18 are light emitting diodes, which are connected in parallel with opposite polarities. 19 is a control box that accommodates the items within the frame.

Next, the operation of this embodiment will be explained. First, when the changeover switch 13 is connected to the contacts a-c and b-t as shown in the figure, the current flows through α→C of the changeover switch 13,
Contact point A of the micro switch 14 via the DC motor 1
+ t , through diode 16, C of switch 13→
It reaches e via b. Therefore, the motor 1 rotates, and the cam 12 rotates in the direction of the arrow S in conjunction with the motor 1.
) by pushing the contact arm h as shown in
is cut off, and at this point the rotation of the motor 1 stops. Note that at this time, contact A-, is connected, but diode 15
No current flows due to the polarity of 3rd, selector switch 13
is connected to α-cl and b-f, ■current passes through the diode 15 from α to d1 of the switch 13, passes through the l to h1 motor 1 of the microswitch 14, and passes through f-+h of the switch 13. This leads to e. Therefore, as the motor 1 rotates, the cam 12 rotates in the T direction in conjunction with this, pushing the contact arm h of the switch 14 as shown in FIG. At this point, motor 1 stops. At this time, the contact h-i is connected, but no current flows due to the polarity of the diode 16. Light emitting diode 17. 18 corresponds to the polarity of the connected power supply,
Either one will light up. It goes without saying that if the ball pulp of the antifreeze plug is directly connected to the cam 12, the pulp can be opened and closed simply by switching the connection of the changeover switch 13.

In this embodiment configured as described above, the two contacts of the microswitch 14 are each provided with a diode 15. 16
．． By connecting them so that they have opposite polarity,
The circuit configuration becomes much simpler and requires only one microswitch, and the connection between the control box 19 and the pulp drive section can be made with a two-core wire.

FIG. 4 shows another embodiment of the invention, which includes two simple on/off switches 23. 24, the switches 23 and 24 are opened alternately in accordance with the rotation of the cam 22 interlocked with the motor 1 in the forward and reverse directions. The operation is exactly the same as the embodiment of FIG.

In the case of pulp opening/closing of the antifreeze stopper in the embodiment, the rotation range of the cam may be 900 degrees, but it can be set arbitrarily within a range of 3601 degrees (one rotation). The DC motor reverse operation circuit according to the present invention can be applied to a wide range of applications, such as industrial robots and various remote controls, in addition to the pulp opening/closing operation of the antifreeze valve.

As explained above, according to the present invention, it is possible to use a commercially available inexpensive 2-core wire as the wiring connecting the operating section and the operating section, compared to the use of a conventional 7-core cable or east wire. , costs can be significantly reduced. In particular, the farther apart the operating section is from the operating section, the greater the effect.

[Brief explanation of the drawing]

FIG. 1 is a circuit configuration diagram of a conventional example, FIG. 2 is a circuit configuration diagram of an embodiment of the present invention, and FIG. 3 is an operation explanatory diagram of FIG. 2.
FIG. 4 is a block diagram of main parts of another embodiment of the present invention. l .......DC motor, 12.22...
...Cam, la...--... Changeover switch, 14...--Micro switch, 15.
16...--Diode, 23.24...
・・・－・・・On/off switch. Patent applicant Rizo Nishimura 489 Figure 1 Figure 2 Figure 3 (Al 18) Figure 4

Claims (1)

[Claims] A first changeover switch that switches the polarity of the DC power applied to the DC motor, a cam that rotates in conjunction with the rotation of the DC motor, and a contact arm that is pushed in response to the rotation of the cam to connect the two contacts. A second changeover switch, one of which is opened, and one terminal is connected to the two contacts of the second changeover switch so that the polarities are opposite to each other, and the other terminals are connected to each other. A secondary side of the first changeover switch has two diodes connected to each other, and a circuit configured of the second changeover switch and the two diodes and the DC motor are connected in series. A DC motor reverse operation circuit characterized by being connected between contacts.