JPH0543196Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a descent control device for a self-weight descent shutter installed in an opening of a building.

[Problems to be solved by the prior art and the invention] Conventionally, self-weight-lowering shutters have been designed to control the deceleration of the dead-weight descent of the shutter curtain by braking with a centrifugal brake to gently lower the shutter curtain. There is.

However, in the above-mentioned centrifugal brake, a governor weight that rotates integrally with the drive shaft presses against the inner wall of the drum case due to centrifugal force, thereby applying braking to the drive shaft, thereby decelerating the drive shaft. Therefore, if the governor weight or drum case is damaged due to wear, the centrifugal brake will not operate. This caused the shutter curtain to fall rapidly, which was extremely dangerous and posed a safety problem.

[Means for solving the problem] In view of the above-mentioned circumstances, the present invention was created with the aim of providing a descent control device for a self-weight descent shutter that can eliminate these drawbacks. The shutter curtain is configured to include a hoisting means for raising the shutter curtain, a lock brake means for locking the shutter curtain from falling under its own weight, and a deceleration control means for applying a brake to the downward movement of the shutter curtain under its own weight to reduce the rate of descent. In the self-weight dropping shutter, the deceleration control means is composed of a centrifugal brake and an electromagnetic powder brake,
The descending speed at which the electromagnetic powder brake applies braking is set to be slower than the descending speed at which the centrifugal brake applies braking, and when the electromagnetic powder brake does not work, the centrifugal brake is used to control the deceleration of the shutter curtain's descending speed. It is characterized by being configured so that braking is activated.

With this configuration, the present invention uses an electromagnetic powder switch to control deceleration at all times, and the centrifugal brake to control deceleration only during infrequent power outages to ensure that the shutter curtain does not fall quickly. This system significantly improves safety by preventing

[Example] Next, an example of the present invention will be described based on the drawings. In the drawing, reference numeral 1 denotes a shutter curtain of a self-weight dropping shutter, and the shutter curtain 1 is guided by guide rails 2 provided on both the left and right sides of the opening, and is guided by a winding drum 4 in a shutter case 3.
The opening can be opened and closed by moving up and down between a stored position in which it is wrapped around the body and a closed position in which it hangs down.

Reference numeral 5 denotes an opening/closing control mechanism for the dead weight drop shutter, and a drive shaft 6 protrudes from the opening/closing control mechanism 5, and a drive side sprocket 6a on which the drive shaft 6 is attached and a support shaft of the winding drum 4 are connected to each other. An electric chain 7 is suspended between the driven sprocket 4a and the driven sprocket 4b. The driving force of the electric motor 7 installed in the opening/closing control mechanism 5 is transmitted to the reducer 8.
The winding operation of the shutter curtain 1 is performed by being transmitted to the winding drum 4 via the winding drum 4.

On the other hand, 9 is a centrifugal brake, and the centrifugal brake 9 rotates integrally with a drum case 9a forming an outer shell and a rotation shaft 10 passing through the drum case 9a, and is directed toward the drum case 9a. It is composed of various member devices such as a governor weight 9b that is provided to move forward and backward, and a bullet 9c that biases the governor weight 9b in a direction to separate it from the drum case 9a. In this case, the governor weight 9b presses against the inner wall of the drum case 9a due to centrifugal force against the urging force of the bomber 9c, and the sliding resistance at this time acts as a braking force to prevent the rotation. The rotating shaft 10 is decelerated.

Further, reference numeral 11 denotes an electromagnetic powder brake, which is actuated by an excitation current inputted through a power supply device 11a shown in FIG. 4 to brake the rotating shaft 10 and decelerate it. However, in this device, the electromagnetic powder brake 11 is adjusted by increasing or decreasing the excitation current with the power supply 11a.
The speed at which the brakes are applied can be adjusted. That is, the rotating shaft 10 passes through the case 12 that constitutes the electromagnetic powder brake 11.
A cylinder 14 filled with magnetic iron powder 13 is fixed to the shaft end of the rotating shaft 10 . Furthermore, a rotor 15 is installed inside the cylinder 14, and the rotor 15 is fixed to the case 12 via a fixed shaft 16 that is fixed to the case 12 by spline fitting or the like. When the rotating shaft 10 and the cylinder 14 rotate as the shutter curtain 1 descends, the magnetic iron powder 13 is pressed against the inner wall of the outer peripheral part of the cylinder 14 by centrifugal force. When the excitation coil 17 provided on the outer periphery of the rotor 15 is energized, the magnetic iron powder 13 becomes magnetic and becomes coupled, and at this time, the frictional force generated between the rotor 15 and the magnetic iron powder 13 becomes a positive force. The rotation of the rotation shaft 10 is braked and decelerated. In this case, the speed at which the electromagnetic powder brake 11 applies braking is slower than the speed at which the centrifugal brake 9 applies braking, that is, the electromagnetic powder brake 11 is set to apply braking at an earlier stage. . In addition, 18 is OFF
This is an electromagnetic lock brake that locks the rotation of the rotating shaft 10 in the ON state to restrict the fall of the shutter curtain 1 under its own weight, and releases this lock in the ON state.

In the embodiment of the present invention constructed as described above, the closing push button switch 19 is pressed to lower the open shutter curtain 1 and close the opening.
When the electromagnetic brake 18 is turned ON, the lock of the electromagnetic brake 18 is released and the shutter curtain 1 is lowered by its own weight.
1 has priority over the centrifugal brake 9, and
As a result, the shutter curtain 1 is controlled to descend at a predetermined speed. On the other hand, when the electromagnetic powder brake 11 does not operate due to a power outage or the like, the centrifugal brake 9 applies braking to the descending speed of the shutter curtain 1 instead, thereby controlling the descending speed.

In cases where the present invention is implemented in this way,
Although the shutter curtain 1 is lowered by its own weight to close the opening, the lowering speed of the shutter curtain 1 is controlled by an electromagnetic powder brake 11 which has no mechanical contact and has excellent durability.
When the electromagnetic powder brake 11 fails or there is a power outage due to a disaster, etc., the centrifugal brake 9 with mechanical contact is used, so the frequency of use of the centrifugal brake 9 is drastically reduced. Therefore, it is possible to reliably prevent the danger of the shutter curtain 1 not being able to decelerate due to wear or damage of the governor weight 9b of the centrifugal brake 9 or the drum case 9a, resulting in a rapid descent. It has extremely high safety. Moreover, the electromagnetic brake 11 can be operated by operating the power supply device 11a.
Since the braking force of the shutter curtain 1 can be freely adjusted, the descending speed of the shutter curtain 1 can be easily adjusted.

[Operations and Effects] In summary, the present invention is constructed as described above, and although the shutter curtain is lowered under its own weight to close the opening, the lowering speed of the shutter curtain cannot be normally controlled. Sometimes this is done using an electromagnetic powder brake, which has no mechanical contact and has excellent durability, but when the electromagnetic powder brake does not work, such as during a power outage, a centrifugal brake is used instead, which has problems with durability. The frequency of use of the centrifugal brake can be significantly reduced, and there is no longer a situation where the shutter curtain falls rapidly due to wear or damage to the centrifugal brake, which makes it impossible to control the descending speed and causes the shutter curtain to descend rapidly. can be significantly improved. Moreover, since the electromagnetic powder brake can easily change the deceleration speed by adjusting the input excitation current, the lowering speed of the shutter curtain can also be adjusted with a simple operation.

[Brief explanation of the drawing]

The drawing shows one embodiment of the descent control device for a self-weight descent shutter according to the present invention, and shows the first embodiment.
The figure is a schematic front view of the self-weight drop shutter.
3 is a longitudinal sectional view of the centrifugal brake, FIG. 3 is a longitudinal sectional view of the electromagnetic powder brake, and FIG. 4 is a circuit diagram of the opening/closing control mechanism. In the figure, 1 is a shutter curtain, 5 is an opening/closing control mechanism, 7 is an electric motor, 9 is a centrifugal brake, 10
11 is an electromagnetic powder brake, and 18 is an electromagnetic brake.

Claims (1)

[Scope of utility model registration request] The shutter curtain is configured to include a hoisting means for raising the shutter curtain, a lock brake means for locking the shutter curtain from falling under its own weight, and a deceleration control means for applying a brake to the downward movement of the shutter curtain under its own weight to reduce the rate of descent. In the self-weight descending shutter, the deceleration control means is composed of a centrifugal brake and an electromagnetic powder brake, and the descending speed at which the electromagnetic powder brake applies braking is set to be slower than the descending speed at which the centrifugal brake applies braking. A descent control device for a dead weight descent shutter, characterized in that the deceleration control of the shutter curtain descent speed is configured such that when braking by an electromagnetic powder brake does not work, braking by a centrifugal brake is activated.