JPS6113663Y2 - - Google Patents

Description

[Detailed description of the invention] This invention prevents equipment damage or burnout accidents even when the revolving door is overloaded or under restricted load operation, and also prevents the revolving door from occurring during frequent intermittent starts and acceleration/deceleration. There is little impact on
The present invention also relates to a rotary drive device that can continuously generate smooth rotational force even under such operating conditions without causing electrical problems caused by excessive currents that occur in ordinary rotary electric motors.

Conventionally, known rotary drive devices for revolving doors include those that combine a complicated slip and clutch brake mechanism with a reduction motor, and those that combine a special torque motor and a reduction gear. However, these types of rotary drive devices are expensive, and if they are frequently started, stopped, or rotated in forward and reverse directions, their mechanical and electrical lifespans are significantly shortened, and they are also prone to breakdowns. Variable speed ones have drawbacks such as being more mechanically complex.

This idea effectively utilizes the thrust-sliding droop characteristic of a linear motor, advantageously solving the above-mentioned drawbacks, increasing the safety of people passing through the revolving door, and making it easier to handle. The object of the present invention is to provide a rotation drive device for a revolving door.

Next, this invention will be explained in detail using illustrated examples.

As shown in FIG. 1, an upper support stand 12 and a lower support stand 13 are fixed to the upper and lower parts of the spacer 11 with bolts to constitute a support frame 2, and the support frame 2 is fixed to a building and A plurality of flat plate-shaped single-sided linear motors 5 are arranged and fixed in the lower part around the support base 12 and the upper part around the lower support base 13, and a steel disc is installed in the space between the opposing linear motors. A secondary conductor 4 made of copper or aluminum thin plates bonded to both sides is arranged with a narrow gap in between.

The center of the secondary conductor 4 is fixed through the input shaft 3, and the input shaft 3 is supported by a bearing fixed to the center of the upper support 12 and a bearing fixed to the center of the lower support 13, An excitation-activated electromagnetic brake 10 is fixed to the upper center of the upper support base 12 with a bolt (not shown), and an armature hub 14 of the electromagnetic brake 10 is slidably and rotatably attached to the upper end of the input shaft 3. The lower end of the input shaft 3 is fitted and connected to an eccentric collar in the reducer 6 fixed to the center of the bottom of the lower support 13.

When the linear motor 5 is energized, the secondary conductor 4 receives thrust due to electromagnetic induction and rotates together with the input shaft 3 (approximately 150 revolutions per minute when no load is applied), and the rotation is input to the speed reducer 6 . This reducer 6 rotates two spur gears eccentrically in a balanced manner through an eccentric collar that is fitted to the input shaft 3 and rotates inside the rotating internal gear, and reduces the speed by reducing the number of teeth between the gears. It is a speed reducer (internal structure not shown) that obtains rotation, and the rotational force reduced to about 6 rotations/minute connects the disk-shaped driving member 15 and the disk-shaped driven member 16 and their surroundings. A joint 9 consisting of a pin 17 transmits power from the output shaft 7 to the vertical main shaft 8 of the revolving door 1 . Further, the input shaft 3, output shaft 7, and main shaft 8 are arranged on the same vertical line.

In addition, the rotational force of this device can be adjusted by increasing or decreasing the number of linear motors 5 used and by increasing or decreasing the supply voltage.Furthermore, the rotational speed can be adjusted by providing a gap with respect to the secondary conductor 4 whose spacing can be adjusted. This is done by using a known braking action in which permanent magnets 18 are placed opposite each other and eddy currents generated inside the secondary conductor 4 rotate by the magnetic flux of the permanent magnets 18 to consume kinetic energy as heat. Since this braking force is proportional to the rotational speed of the secondary conductor 4 and the density of the magnetic flux of the permanent magnet 18, an effect is exerted to keep the rotational speed constant against fluctuations in the rotational speed of the door. An appropriate rotation speed can be obtained by adjusting the distance. To explain the basic operation example of this device with reference to FIGS. 2 and 3, each door 19A
When any of the four sets of door switches 20A to 20D installed in the push plate of 19D and connected in parallel is turned on, a starting signal is input to the control device 22 via the current collector ring 21, and the linear The revolving door 1 starts rotating by applying voltage to the motor.

At the time of starting, the circuits of each linear motor 5 are connected in parallel and the full power supply voltage is applied to the linear motors, thereby inducing in the secondary conductor 4 the required starting rotational force that matches the load conditions of the revolving door. During steady rotation after starting, two linear motors are connected in series by circuit switching using time relay TR1, and multiple sets of them are connected in parallel to reduce the voltage applied to the linear motor by half. Gives a relatively weak rotational force.

Drive member 1 fixed to the lower end of the output shaft 7
Four angle detection pieces 23A to 2 are installed on the outer peripheral side of 5.
A non-contact proximity sensor 24 that faces the angle detection piece is fixed near the ceiling of the building, and is fixed at angular intervals of 90° as the door rotates. A counting signal is input to the control device 22, and at the position where the linear motor has rotated 180 degrees after starting, the power supply to the linear motor is cut off, the revolving door rotates by inertia for the time set in time relay TR2, and then the time relay After the set time, TR3 and TR4 generate a smooth braking force through reverse phase control, inertia rotation, and reenergization by power supply to the linear motor, and the rotation speed is reduced to 90%.
゜Stopped at the rotated position.

If the door switches 20A to 20D are turned on during the above basic rotation operation, that is, before the door completes its 270° rotation, the proximity sensor will turn the 90° angle again from that position.
It rotates steadily until it counts the 270° angle twice, then moves to the detected speed rotation from the 180° passing position, and stops at the position where it counts and senses the 270° rotation. Therefore, when the revolving door is being rotated by the linear motor being energized, if the door switches 20A to 20D are turned on intermittently or continuously, the door will continue to rotate steadily.

As mentioned above, the known excitation actuated electromagnetic brake 10 is fixed to the center of the upper support base 12.
Normally, the electromagnetic brake 10 is energized except when the door is rotated by energization of the linear motor, and the armature of the armature hub fitted to the upper end of the input shaft 3 is attracted to the friction plate of the electromagnetic brake 10, so that the input shaft 3 To improve the accuracy of a predetermined stopping position of a revolving door, and to restrain the door from rotating due to external forces such as wind pressure.

The load of the main shaft 8 and the four doors 19A to 19D held upright in a cross shape around the main shaft 8 is supported by a thrust bearing 25 embedded in the floor surface, and rotates on a vertical line of the thrust bearing. The drive device is fixed near the ceiling of the building, and the upper end of the main shaft 8 is connected to the output shaft 7 of the rotation drive device via the joint 9, so that the rotation drive device can also be used as the upper bearing of the revolving door 1. Ru.

When implementing this invention, a known arbitrary structure may be used as the speed reducer 6.

According to this invention, since the synchronous speed of the linear motor 5 that rotates the secondary conductor 4 fixed to the input shaft 3 is low, the reduction gear 6 has a low reduction ratio to obtain the required rotation speed. Moreover, since the force transmission by the thrust of the linear motor is performed without contact, the revolving door can be easily rotated in either the forward or reverse direction by human power by turning off the power to the linear motor 2 and the electromagnetic brake 10. In addition, this device has a small number of components, and its durability against seizure of bearings etc. is greatly extended.
Moreover, since it is extremely thin and has an integrated structure, it requires only a small installation space, and provides advantages such as easy installation, adjustment, maintenance, and inspection.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional side view showing a rotation drive device for a revolving door according to an embodiment of this invention, Fig. 2 is a schematic plan view showing a part thereof, and Fig. 3 shows the strength of the rotational force and rotation of the revolving door. It is a basic operation diagram showing the trend of numbers. In the figure, 1 is a revolving door, 2 is a support frame,
3 is the input shaft, 4 is the secondary conductor, 5 is the linear motor,
6 is a reducer, 7 is an output shaft, 8 is a main shaft, 9 is a joint,
10 is an electromagnetic brake, 12 is an upper support base, 13 is a lower support base, 14 is an armature hub, 15 is a driving member, 16 is a driven member, 17 is a pin, 18 is a permanent magnet, 19A to 19D are each door, 20A to 20D
is a door switch, 21 is a current collector ring, 22 is a control device, 23A to 23D are angle detection pieces, and 24 is a proximity sensor.

Claims (1)

[Scope of utility model registration request] A vertical input shaft 3 is rotatably supported by a support frame 2 provided above the revolving door 1, and the peripheral portion of the disk-shaped secondary conductor 4 fixed to the input shaft 3 The lower part of the input shaft 3 is connected to the input part of a reducer 6, and the output part of the reducer 6 has an output shaft 7 perpendicular to the output part of the reducer 6. The lower end of the output shaft 7 and the upper end of the main shaft 8 of the revolving door 1 are connected via a joint 9, and an electromagnetic brake 10 is connected between the input shaft 3 and the support frame 2. A rotation drive device for a revolving door, characterized in that: