JPS5816074B2 - How to open the shutter - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for opening a shutter.

Normally, shutters that are automatically opened and closed by a motor are not suitable for shutters for entrances and exits of fire engines, emergency ambulances, cash transport vehicles, etc. because the lifting and lowering movements are too slow; however, if the lifting and lowering movements are made faster, the shutters start and stop suddenly. The defect was that the impact was large and dangerous.

In order to eliminate the above-mentioned defects, conventionally, a stop cam and a speed conversion cam that operate in conjunction with the vertical movement of the shutter, and a lifting relay and a speed conversion relay that operate by the operation of a switch corresponding to each cam. and a pole number conversion circuit that is switched by the operation of each relay to control the start and stop operations and rotation speed of the motor, so that the shutter can be raised and lowered slowly when starting and stopping, and quickly when it is in the middle. Shutter opening/closing device (1973-
49228) was proposed.

However, in the above-mentioned conventional shutter opening/closing device, when the shutter is stopped halfway, the speed conversion cam keeps the switch for rapid lifting/lowering activated, so if the shutter starts lifting/lowering in this state, the shutter starts rapidly. It was dangerous and had a defect that could cause a malfunction.

The object of the present invention is to eliminate the above-mentioned defects, and to provide a system that allows the shutter to slowly rise for a certain period of time and then rise at high speed, whether the shutter is in a closed state and the shutter is started and raised, or when it is raised from a stopped state. The object of the present invention is to provide a method for opening a shutter that is highly safe and durable.

Hereinafter, an embodiment of a shutter opening/closing device embodying the present invention will be described with reference to FIGS. 1 and 2. In the drawings, 1 is a shutter, 2 is a winding drum, and a sprocket 3 is fixedly attached to the shutter.

Ml is a first motor for low speed, Ml is a second motor for high speed, and the rotating shaft of the first motor M1 is connected to the second motor M2 via the first reducer 4 and one-way clutch 5 (or electromagnetic clutch). The motor M2 is connected to a second reduction gear 6, and a chain 9 is wound around the sprocket 3 and the sprocket 8 fixed on the output shaft γ.

B is an electric brake connected to the rotating shaft of the first motor M1, and 10 is a speed regulating mechanism attached to the side of the brake B for controlling the rotational speed of the rotating shaft of the first motor M1.

C is the first and second motor M1. This is a control circuit for M2 and electric brake B, and the circuit C is connected to a three-phase power source 11.

BSI, BS2. BS3 is a push button switch for raising, lowering, and stopping, respectively, and is connected to the control circuit C.

LS1 is a limit switch for sensing the upper limit of the shutter and stopping the upward movement, LS2 is a limit switch for sensing that the shutter has been wound up close to the upper limit and switching from the second motor M2 to the first motor M1, LS3 is the limit that senses the lower limit of the shutter and stops the lowering operation.

each limit switch LS1;
~LS3 is connected to the control circuit C, and is operated by an actuator (not shown) that is reciprocated by the output shaft 7 of the second reduction gear 6 in synchronization with the vertical movement of the shutter. It has become.

Next, the control circuit C will be explained in detail with reference to FIG.

Terminal Z1 of the three-phase power supply 11. Z2. The first motor M1 and the second motor M2 are connected to Z3, and two terminals Zl,
The electric brake B is connected to Z3.

The two terminals Z1. The first to third circuits E and F are further connected to Z3, and the first circuit includes the push button switch BS1 for raising, the electromagnetic contactor MCI for starting the first motor M1, and the upper limit switch for the shutter 1. A limit switch LSI for sensing is connected to the normally open contact M of the electromagnetic contactor MC1.
C1-1 is connected to the circuit of the first motor M1, and self-holding contact MC1-2 is also connected in parallel to the push button switch BSI.

A timer T is connected in parallel to the first circuit electromagnetic contactor MCI, which starts the second motor M2 after a certain period of time after the shutter 1 starts to rise and raises the shutter at high speed. is the limit switch LS2
, an electromagnetic contactor MC2 for starting the second motor M2 and a normally open contact T1 of the timer T are connected in parallel, and a normally open contact MC2-1 of the electromagnetic contactor MC2 is connected to the circuit of the second motor M2. There is.

The second circuit E includes a normally open contact MC of the magnetic contactor MCI.
1-3 and a relay R for releasing the electric brake B are connected, and a normally open contact R1 of the relay R is connected to the electric brake B circuit.

The third circuit F includes the push button switch BS2, the limit switch LS3, a magnetic contactor MC3 for starting the reverse rotation of the first motor M1, and a normally closed contact MC1 of the magnetic contactor MCI.
-4 is connected to the normally open contact MC of the electromagnetic contactor MC3.
3-1 is connected to the reversing circuit of the motor M1,
Similarly, the normally closed contact MC3-2 of the magnetic contactor MC3 is connected to the first circuit, and the normally open contact M of the magnetic contactor MC3 is also connected to the first circuit.
C3-3 is connected in parallel to the normally open contact MC1-3 of the second circuit E.

Also, the normally open contact R2 of the relay R of the second circuit E is connected to the third circuit F.
The third circuit F is connected in parallel to the push button switch BS2, and the third circuit F is connected to a changeover switch S for switching between the electromagnetic contactor MC3 and the normally closed contacts MC1-4 and the relay R.

The push button switch BS3 is connected between the three-phase terminal z1 and the first circuit.

Also, the first point above. Second motor M1. Thermal relay THI is installed in the M20 circuit.

TH2 and TH3 are connected, and their normally closed contact TH1-
1, TH2-L T'1f (3-1 is connected between the terminal z1 and the first circuit.

Next, the operation of the shutter opening/closing device constructed as described above will be explained.

Now, FIG. 2 shows a state in which the shutter is closed.

To open the shutter in this state, press the rising pushbutton switch BSI, which closes the first circuit, energizes the magnetic contactor MCI, closes the normally open contacts MC1-2, and self-holds the shutter. T is also activated and starts counting.

Then, the normally open liquid #Ic1-3 of the second circuit E is closed and the relay R is energized, its normally open contact R1 is closed and the electric brake B is released, and at the same time the normally open contact MC1- of the magnetic contactor MCI is closed. 1 is closed and the first motor M1 is started,
The shutter is raised slowly.

When the shutter is slightly released and the timer T times up and closes its normally open contact T1, the electromagnetic contactor MC2 is energized and its normally open contact MC2-1 is closed, so the second motor M2 is started and the shutter is activated. It is rolled up at high speed.

Even if the second motor M2 is started, the magnetic contactor MCI in the first circuit remains energized, so the first motor M1
However, due to the one-way clutch 5 (or the release of the electromagnetic clutch), the first motor M1 does not act as a load on the second motor M2.

The shutter is wound at high speed, and the limit switch L
When S2 is opened, the magnetic contactor MC2 is demagnetized, so the normally open contact MC2-1, which is in the closed state, is opened, and the current supply to the second motor M2 is stopped.

Therefore, the shutter is wound up at a low speed by the first motor M1.

When the shutter reaches the upper limit, the limit switch LSI is activated, so the first circuit is opened and the magnetic contactor MCI is demagnetized, stopping the current supply to the first motor M1. Open contacts MC1-3 are opened, relay R is demagnetized, and normally open contacts R are therefore closed.
1 is opened, the electromagnetic brake B is returned to the braking state, and the shutter is held in the released state.

By the way, FIG. 3a shows the above-mentioned shutter raising operation, with the horizontal axis showing the shutter raising position and the vertical axis showing the shutter raising speed above.

Push button switch BS3 to stop the shutter while it is rising at high speed
When you operate, the first and second circuits will be activated.

E is opened and the first and second motors M1. M2 is stopped and the shutter is stopped halfway, but from this state, when the raising pushbutton switch BSI is operated again, the first motor M1 winds up the shutter at a low speed in the same manner as the raising operation described above, and the shutter is wound up at a constant speed. It is wound up at high speed by the second timeless motor M2.

(See the two-dot chain line in Figure 3a) Next, to close the shutter from the open state, press the lowering pushbutton switch BS2, which will energize the electromagnetic contactor MC3 and make its normally open contact MC3-
3 activates the relay R of the second circuit, the electric brake B is released, and at the same time the normally open contact MC3-1 is closed, the first motor M1 is reversed, and the shutter is lowered at a low speed.

When the shutter is moved to the lower limit, the limit switch LS3 is opened, the third circuit F is opened, and the normally open contact MC3-1 of the magnetic contactor MC3 is opened, causing the first motor to reverse rotation. At the same time, the normally open contact MC3-3, which was also closed, is opened and the electromagnetic brake is returned to the braking state, so that the shutter is stopped in the closed state.

(Refer to Figure 3) When the changeover switch S is switched from the electromagnetic contactor MC3 to the relay R and the push button switch BS2 is pressed, the relay R is energized and its normally open contact R1 is closed, so the electromagnetic brake is released and the shutter is closed. It is rewound and closed by its own weight.

In the case of the shutter's own weight falling, the speed regulating mechanism 10 acts and the falling speed becomes almost the same as shown by the two-dot chain line in FIG.

In this way, in the embodiment of the present invention, the push button switch BS
1, the first motor M1 is activated by the magnetic contactor MCI, the shutter is raised at low speed, and after a certain period of time, the magnetic contactor MC2 is excited by the timer T, and the second motor M2 is activated.
The shutter is raised rapidly by activating the
Even if it is stopped in the middle of the high-speed climb area, when the climb is started, it can be started at a low speed and then switched to high speed, so that the impact at the start of the climb can be reduced in any case. The shutter can be opened safely and the durability of the shutter can be improved.

Note that the present invention can also be embodied in the following embodiments.

(b) In the above embodiment, when the high-speed motor M2 is rotating and the shutter is being wound at high speed, the normally closed contact of the electromagnetic contactor MC2 is connected to the first circuit so as to stop the first motor M1. to do.

(b) Use a two-stage, three-stage, etc. motor that can change the number of poles, and operate the motor at variable speeds using an electromagnetic contactor, timer, and relay.

(c) The timer T in the first circuit can be opened by a manual switch (not shown), so that the shutter can be wound up to its upper limit at a low speed.

As described in detail above, the present invention provides that even if the shutter is at the lowest position or stopped midway, when the shutter is started in the winding direction, the motor starts winding at a low speed and the timer is operated to set the shutter for a predetermined time. After the time has elapsed, the motor switches to high speed and winds up the shutter, allowing the shutter to start without shock even if it has been stopped mid-way, allowing the shutter to be opened safely and improving the durability of the shutter. There is an effect that can be used.

[Brief explanation of the drawing]

FIG. 1 is a front view showing an embodiment of a shutter opening/closing device embodying the present invention, FIG. 2 is a control circuit diagram, and FIG. 3 is a diagram illustrating the raising and lowering operation of the shutter. First and second motors M1. M2, timer T, magnetic contactor MCI, MC2゜

Claims (1)

[Claims] 1. Even if the shutter is at its lowest position or stopped midway, when it is started in the winding direction, the motor starts winding at a low speed and a timer is activated,
A method for opening a shutter, characterized in that when a predetermined period of time elapses, the motor is switched to high speed and winds up the shutter. 2. The opening of the shutter according to claim 1, in which the first low-speed motor is started to wind the shutter at a low speed, and the second high-speed motor is started to wind the shutter at a high speed when a timer times up. Method. 3. The shutter opening method according to claim 2, wherein the first motor is rotated even while the second motor is rotating. 4 A pole number changing motor capable of changing speeds in two stages is rotated at a low speed to wind up the shutter at a low speed, and when a timer times up, the pole number changing motor is rotated at a high speed to wind up the shutter at a high speed. The shutter opening method described in Section 1.