JPS5931606B2 - Control circuit for electric operating machine for wire rope type water gate drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control circuit for a motor for a wire rope type flood gate.

Unlike the control circuits for stem screw type water gates and valves, the drive operation circuit for wire rope type water gates is generally designed to prevent the wire rope from loosening due to foreign matter getting caught in the middle of lowering the gate, and to prevent the wire rope from loosening at the lower end of the gate. To minimize the tension on the wire rope, consideration must be given to the ability to completely bend and stop the rope.

For this reason, there is a problem in that if a separate mechanism for detecting the slack of the wire rope is provided, it will be expensive.

This invention was made in view of the above-mentioned problem, and uses the electric contact of the detection device provided in the electric operating machine for driving the wire rope type water gate 1, without separately providing a wire rope slack detection mechanism. To provide a control device which can be constructed at low cost and which can prevent a wire rope from loosening during hoisting and control the wire rope to bend and stop at the lower limit end of a gate using an electric circuit. The purpose is to

An embodiment of the present invention will be described below with reference to the drawings.

In Fig. 1, 1 is a motor for opening and closing the door of a wire rope water gate, and its output shaft is a gear 2. z, via a worm shaft 3 with a worm 4 connected to a worm gear 5, which drives a drum (not shown) for winding a wire rope connected to a sluice gate (not shown) It is connected to the shaft 6.

The worm shaft 3 is supported at one end by a disc spring 7, and is configured to be displaced in the axial direction as shown by arrow A depending on the magnitude of the load applied to the drive shaft 6. .

Reference numeral 8 denotes a torque detection mechanism, in which a bar 8b is fitted into a groove 8a provided in the shaft 3, and an operating piece 8c is attached to the upper end of the bar 8b. , the bar 8b rotates and the operating piece 8c rotates to operate either the overload torque switch 9 or the wire/rope detection switch 10.

The overload torque switch 9 is activated at loads exceeding a predetermined load torque value in response to the sluice load that occurs during sluice hoisting.

The wire rope slack detection switch 10 is activated when the water gate is lowered.
When the wire rope becomes slack due to a foreign object being caught in the water gate, the system senses the decrease in the hoisting load generated at the drive control section and operates.

11 is an upper limit detection switch of the water gate, 12 is a lower limit detection switch, and 13 is an intermediate position detection switch. Each detection switch is opened and closed by cams 15, 16, and 17 rotated by a worm mechanism 13 connected to the drive shaft 6. Ru.

The intermediate position detection switch 13 is positioned relative to the cam 17 so that it is turned on from the position where the water gate reaches a position slightly above the lower limit to the lower limit.

These switches are used in the control circuit shown in FIG.

In FIG. 2, the control power supply 21 has a stop pushbutton switch 22 and a normally open contact 2 of a gate rolling pushbutton switch 23.
3a, normally closed contact 2 of push button switch 24 for gate lowering
4b, normally closed contact 26b of the lowering electromagnetic switch 26, excitation coil 2 of the hoisting electromagnetic switch for energizing the drive motor 1
5. Connect the normally closed contact 9b of the overload torque switch 9 and the normally closed contact 11b of the upper limit position switch 11 in series, and connect the self-holding contact 5a of the relay 25 in parallel with the gate winding push button switch 23 in between. Connected.

In addition, an upper limit indicator light 30 is connected to the normally open contact 11a of the upper limit position switch 11 to display the upper limit position, and
The normally open contact 9a of the overload torque switch 9 is connected to the load indicator light 31 to display the operation of the overload torque switch 9, thereby forming a control circuit for gate hoisting.

In addition, the power supply 21 includes a stop pushbutton switch 22, a normally open contact 24a of the gate hoisting pushbutton switch 24, a normally closed contact 23b of the gate hoisting pushbutton switch 23, and a normally closed contact 25b of the hoisting electromagnetic switch 25. , the excitation coil 26 of the lowering electromagnetic switch for energizing the drive motor 1', the normally closed contact 10b of the wire rope slack detection switch 10, and the normally closed contact 12b of the lower limit position switch 12 are connected in series, and the gate The lowering pushbutton switch 24 and the self-holding contact 26a of the relay 26 are connected in parallel with the normally open contact 24a interposed therebetween.

Also, the normally closed contact 1 of the wire/rope slack detection switch 10
0b and the normally open contact 13a of the intermediate position switch 13 are connected in parallel, a lower limit indicator light 32 is connected to the normally open contact 12a of the lower limit position switch 12, and a wire is connected to the normally open contact 10a of the wire/rope slack detection switch 10. - A rope slack indicator light 33 is connected to display the lower limit position and the operation of the wire rope slack switch, thereby configuring a lower hoisting side control circuit.

When the hoisting pushbutton switch 23 is pressed, the normally closed contact 23b of the hoisting control circuit is cut off, and when the hoisting pushbutton switch 24 is pushed, the normally closed contact 24b of the hoisting control circuit is cut off. Furthermore, when the excitation coil 25 of the electromagnetic switch in the hoisting control circuit is excited, the normally closed contact 25b of the hoisting control circuit is disconnected, and when the excitation coil 26 of the electromagnetic switch in the hoisting control circuit is excited, the winding is closed. The normally closed contact 26b of the upper control circuit is disconnected, so that they are mutually interlocked.

When the hoisting pushbutton switch 23 is pressed now, the current flows through the normally closed contact 24b, the normally closed contact 26b, the excitation coil 25, the normally closed contact 9b of the overload torque switch 9, and the upper limit position switch 11.
The excitation coil 25 of the hoisting electromagnetic switch is energized, and the drive motor 1 is energized.

As the drive motor 1 rotates, the drive shaft 6 rotates, the wire rope is wound around the drum, and the sluice gate is raised.

At this time, even if the soil rolling push button switch 23 is released, the self-holding contact 25a remains closed and the coil 2 of the electromagnetic switch
5, the electromagnetic switch 25 can self-hold and operate the water gate.

Also, at this time, even if the lowering pushbutton switch 24 is pressed, the normally closed contact 25b is disconnected, so the coil 2 of the lowering electromagnetic switch is disconnected.
6 is not energized.

If abnormal excessive torque is applied to the water gate during the hoisting operation of the water gate, the movement of the worm shaft 4 causes the actuating piece 8C to
rotates, the overload torque switch 9 operates, the normally closed contact 9b is opened, and the normally open contact 9a is connected.

Therefore, the electric operation of the water gate is stopped, and the overload indicator light 3
1, a current flows through it and it lights up, giving an alarm that an abnormality has occurred in the water gate.

Further, when the water gate reaches its upper limit, the upper limit position switch 11 is operated by the rotation of the cam 15, and the electromagnetic switch 2 is activated.
5 is cut off to automatically stop the water gate, and an upper limit indicator light 30 indicates that the water gate is at the upper limit.

When lowering the water gate, the lowering pushbutton switch 24 is pressed and the water gate is operated in the same manner as for hoisting.

That is, the drive motor 1, which excites the coil 26 of the lowering electromagnetic switch, rotates in the opposite direction to the one for hoisting, loosens the wire rope, and lowers the water gate by its own weight.

At this time, if the gate stops midway through lowering due to a foreign object getting caught and the wire rope begins to loosen, the torque applied to the drive shaft 3 is reduced, the actuating piece 8c reverses, and the wire rope slack detection switch is activated. 10 is activated, the normally closed contact 10b is opened, and the drive motor 1 is automatically stopped to prevent the wire rope from becoming loose, and the normally open contact 10a is connected, and the wire rope slack indicator light 33 lights up to issue an alarm. emits.

At the lower limit of the water gate, it is necessary to completely bend the wire rope and stop the wire rope in order to minimize the tension of the wire rope, but if there is no intermediate position detection switch 10, if the water gate is operated to the lower limit, , the wire rope slack detection switch 10 is operated, and the electric motor 1 is stopped before the wire rope is sufficiently bent.

However, in this embodiment of the invention, the intermediate position detection switch 13
is turned on and the wire rope slack detection switch 10 is short-circuited, so even if the water gate actually reaches the upper and lower limits, the electric motor 1 does not stop, giving slack to the wire rope.

Then, as the electric motor 1 further rotates, the cam 1
5, 16, and 17 rotate, the lower limit position switch 12 is activated, and its normally closed contact 12b is opened to open the electromagnetic switch 26.
The electric motor 1 is cut off and the electric motor 1 is stopped.

Also, the normally open contact 12a is turned on, and the lower limit indicator light 32 lights up to indicate that the water gate is at the lower limit.

As detailed above, according to the present invention, when opening and closing a wire rope type water gate, it is not only possible to automatically stop the water gate at the upper and lower limit positions, but also to prevent overload during hoisting.
It can automatically stop when the wire rope becomes slack during lowering, and the wire rope can be stopped automatically at the lower end of the water gate.
The rope can be bent and stopped, and can be controlled so that no extra load is applied to the wire rope.

Furthermore, the control device of the present invention does not require an expensive tension detector or the like, and is composed of a normal switch device and a relay circuit, so that the control device has a simple structure and is inexpensive.

Note that the present invention is also applicable to winch devices and the like that use wire ropes.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the main parts of a water gate drive mechanism and a switch in an embodiment of the present invention, and FIG. 2 is a control circuit diagram showing an embodiment of the invention. 1... Drive motor, 9... Overload trick switch,
10... Wire/rope slack detection switch, 11...
・Upper limit position switch, 12...Lower limit position switch, 1
3... Intermediate position detection switch, 25, 26... Electromagnetic switch.

Claims (1)

[Claims] 1. A stop switch for the upper limit position that operates to automatically stop the hoisting side operation circuit of the wire rope water gate at the upper limit of hoisting, and a protection switch that automatically stops the drive motor when an overload is applied to the water gate. are connected in series, and a stop switch for the lower limit position that automatically stops the hoisting at the lower hoisting limit is connected in series to the lower hoisting operation circuit, and a switch that detects loosening of the wire rope due to foreign objects caught during the hoisting operation is connected in series. and an intermediate position switch connected in parallel across the wire rope slack detection switch, thereby making it possible to completely bend the wire rope at the lower limit. Control circuit for electric drive actuator.