JPS5842392B2 - drive mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a drive mechanism, and more particularly to a drive mechanism suitable for driving a transport device for continuous glass strips withdrawn from a melting furnace.

After the continuously produced sheet glass strip is pulled out of the glass melting furnace, it is slowly cooled while being transferred by transfer rolls, and then sent to the cutting process.

Since the sheet glass is thus fed in a continuous band until it is cut, accidental stoppage of the conveying device is not allowed.

In other words, if the transfer rolls stop due to a small problem during the transfer of the plate glass strip, the part of the roll near the exit of the glass melting furnace that is in contact with the glass strip will be excessively heated due to the high temperature glass, causing deformation due to thermal stress. becomes unusable.

In addition, as the amount of glass drawn from the melting furnace becomes zero, it is necessary to stop feeding raw materials and adjust the burner to prevent corrosion of the refractory bricks. Even if it reopens, it will not be possible to produce products for a while.

Therefore, the equipment for transporting continuous sheet glass strips up to the cutting process cannot be allowed to stop accidentally due to accidents, etc., and must be equipped with an uninterruptible device to deal with power outages, as well as mechanical and electrical accidents. A backup drive mechanism is provided to allow for

Conventionally, such a pre-drive mechanism is stopped while the main drive mechanism is in operation, and when an abnormality occurs in the main drive mechanism, it is detected and an automatic clutch is activated, which activates the pre-drive mechanism and switches the drive. It was configured.

However, in this conventional system, it is difficult to adjust the switching timing, and if the switching timing is not appropriate, a sudden change in the transfer speed occurs at the time of switching, which has a negative effect on the articles being transferred.

In addition, the automatic clutch and its control device have become complicated, and their maintenance and inspection require a great deal of manpower and time.

An object of the present invention is to eliminate the above-mentioned drawbacks of the prior art, and to provide a drive mechanism that can quickly switch to a backup drive mechanism without causing a sudden speed change to the driven device when an abnormality occurs in the main drive mechanism. It is about providing.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a drive mechanism 11 applied to a sheet glass band transfer device 10. As shown in FIG.

In FIG. 1, the main motor 1 connects the counters of the driven rollers 6 . It is connected to the shaft 7.

The standby electric motor 11 has the same drive transmission mechanism as the main electric motor 1, that is, a reduction gear 2/, a connecting shaft 9/1, an overrunning cam clutch 3/.

A manual switching pawl clutch is connected to a countershaft 7 via a 4/1 chain reduction gear 5.

It is preferable that the motors 1 and 11 are drive DC motors controlled by the Ward Leonard method (armature voltage control method).

In such a drive mechanism 11, the dual-chamber motor 1°11 is constantly rotating, and the rotational speed of the main motor 1 must be set to be faster than the rotational speed of the standby motor 11 under normal conditions. .

The speed setting control system 20 for the electric motors 1, 11 will be explained according to FIG.

In FIG. 2, the operating speed setter 21 sends a voltage signal r corresponding to a predetermined rotational speed R to the armature of the main motor 1.

At the same time, the signal r is sent to the difference signal generation circuit 22, where it is subtracted by the signal α corresponding to a predetermined speed difference ΔR from the speed difference setter 23, and then sent to the armature of the standby motor 11.

The main motor 1 rotates at a rotation speed R, and the standby motor 11 rotates at a rotation speed (R-ΔR) slower than the main motor 1.

The speed difference ΔR set by the speed difference setter 23 needs to be larger than the rotational speed fluctuation range of the electric motors 1 and 11 due to load fluctuations.

With this configuration, during normal operation, the power of the main motor 1 is transmitted to the countershaft 7 via the overrunning cam clutch 3, but the power of the standby motor 11 is transmitted because the overrunning cam clutch 31 is overrunning. Not communicated.

However, if the rotational speed of the connecting shaft 9 becomes lower than that of the connecting shaft 9' on the side of the standby electric motor 11 due to a mechanical failure of the main motor 1 or reduction gear 2 or an electrical failure of the main motor 1, the overrunning cam clutch 3 open up,
At the same time, the overrunning cam clutch 31 is engaged and the power source is switched from the main motor 1 to the standby motor 11.

In this way, the switching to the standby motor 1' is performed when the rotational speed of the main motor 1 is synchronized with the rotational speed of the standby motor 11, which has been operated with no load, so the switching is smooth.
No sudden speed fluctuations of the transfer device 10 occur.

After switching to the standby motor 11, it is desirable to make the rotational speed of the standby motor 11 equal to the rotational speed R of the main motor 1 during normal operation.

An example of a control system for this purpose is shown in FIG.

That is, the detector 24 detects the rotation speed of the main motor 1,
A comparison circuit 25 compares the signal r' corresponding to the detected speed and the rotational speed setting signal r-α of the standby motor 11.

The rotational speed of the main motor 1 is set to the set speed R- of the standby motor 11.
When it becomes lower than ΔR, that is, when the detection signal rl becomes smaller than the signal R-α, the timer 28 is activated via the amplifier 27, and after a predetermined period of time, the contact 29 is opened to cut off the output α of the speed difference setting device 23. do.

As a result, the signal r from the speed setter 21 is input to the standby motor 11, and the rotational speed of the standby motor 11 becomes equal to the rotational speed R of the main motor 1 during normal operation.

As described above, the present invention provides an excellent drive mechanism that does not cause sudden speed fluctuations to the driven mechanism and can switch to the preliminary drive mechanism without requiring a complicated electrical control device. be.

In addition, as in the embodiment explained along the drawings, the main motor 1
Although it is preferable that the power transmission mechanism combined with the standby electric motor 11 and the power transmission mechanism combined with the standby electric motor 11 have the same structure, different transmission mechanisms may be used.

Furthermore, it is clear that the speed setting control system 20 is not limited to the configuration shown in FIG. 2, but may have other configurations having similar functions.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a drive mechanism according to the present invention applied to a continuous glass strip conveying device. FIG. 2 is a diagram showing an example of a speed setting control system. Explanation of symbols, 1... Main motor, 11...
...Spare motor, 2,21...Reduction gear, 3,3
1...Overrunning cam clutch, 10
...Transfer device, 11... Drive mechanism.

Claims (1)

[Scope of Claims] 1. A main electric motor connected to the driven mechanism via a first overrunning clutch, a standby electric motor connected to the driven mechanism via a second overrunning clutch, and a main electric motor connected to the driven mechanism via a second overrunning clutch; and means for setting the rotational speeds of both the electric motors so that the driving speed of the driven mechanism is slower than the driving speed of the main electric motor. 2. A main electric motor connected to the driven mechanism via a first overrunning clutch, a standby electric motor connected to the driven mechanism via a second overrunning clutch, and driving of the driven mechanism by the standby electric motor. means for setting the rotational speeds of the two electric motors so that the speed is slower than the driving speed of the main motor, and the rotational speed setting means is configured to set the rotational speed of the driven mechanism by the main motor due to some abnormality. a detecting means for outputting an output when the driving speed has decreased to the driving speed by the standby motor; and a detecting means for outputting an output when the driving speed has decreased to the driving speed by the standby motor; and means for varying the rotational speed.