JPH0437194Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a speed control device for a revolving door that applies a brake to decelerate the door when the rotation speed exceeds a certain level.

[Prior Art] Generally, as shown in Fig. 1, a revolving door has four doors 2 mounted radially on a rotatable support 1 at intervals of 90 degrees, and when entering and exiting, the doors are placed on the right side in the direction of travel. The user enters and exits while pushing the door 2 while rotating along the arcuate walls 3 on both sides.

[Problems to be solved by the invention] However, in the conventional revolving door, when the door 2 is pushed hard, it rotates at a rapid speed, and the rotation is connected by inertia, making it difficult for the door to slow down.
If the timing of entry and exit is off, there is a drawback that bodies or luggage can get caught, leading to unexpected accidents.

[Means for solving the problem] The present invention was made to solve the above-mentioned drawbacks.A rotation speed sensor is installed on the rotating column, and when the rotation speed exceeds a certain level, an electromagnetic brake is applied. , to reduce the speed to a safe level.

[Example] Hereinafter, an example of the present invention will be described based on the drawings.

In FIG. 1, a speed control device 4 fixed to a ceiling or the like is provided at the upper end of a rotating support 1. As shown in FIG. As shown in FIG. 2, this speed control device 4 has a shaft 6 vertical to the center of a cylindrical case 5 rotatably provided by upper and lower bearings 7, 8, and a downward protrusion of this shaft 6. Part 9 is fixed to said rotating column 1. A core 12 and a coil 13 of an electromagnetic brake 11 are provided on the bottom plate 10 of the case 5 and around the outer periphery of the lower bearing 8. Further, a support disk 14 is fixed to the shaft 6, and a disk-shaped brake plate 15 is attached to the lower surface of the support disk 14 by a leaf spring 16. This leaf spring 16 has a ring shape as shown in FIG.
It is fixed to the supporting disk 14 by screws 17 at intervals of 100 degrees, and also at an intermediate position between these screws 17.
Brake plate 15 by screws 18 at 120 degree intervals
By supporting the core 12 and the brake plate 15, a gap d is normally formed between the core 12 and the brake plate 15. Two detection disks 19 and 20 that rotate together are provided on the upper surface of the support disk 14.

As shown in FIG.
80 and reverse rotation detection hole group 22 are arranged at equal intervals (4 degrees).
30 minutes) and slightly shifted (1 degree 7 minutes 30 seconds). When the lower detection disk 19 rotates to the left (forward rotation), the rotation speed and the forward rotation detection hole 21 are slightly higher than the reverse rotation detection hole 22 (1 degree 7 minutes 30 seconds), as shown in FIG. 4b. Because of this, the detection pulses from these holes 21 and 22 are overlapped with each other and detected as shown in Fig. 4b, c and d, and the first reverse rotation detection hole 22 and the second rotation speed and positive The rotation detection holes 21 are provided apart from each other to the extent that they do not overlap with each other.

Further, the upper detection disk 20 is provided with four fixed position detection holes 23 at intervals of 90 degrees, as shown in FIG. Three photosensors 24, 25, 26 are provided within the cover 5 at 90 degree intervals, and a first
A photo sensor 24 for detecting the rotation speed and forward rotation is provided with a light emitting diode 27 and a phototransistor 28 facing above and below the rotation speed and forward rotation detection hole 21 of the lower detection disc 19, and a photo sensor 24 for detecting the second reverse rotation. The photo sensor 25 has a light emitting diode 29 and a phototransistor 30 facing the reverse rotation detection hole 22 of the lower detection disc 19, and a third fixed position detection photo sensor 26 has a light emitting diode 31 and a phototransistor 32. It is installed facing the fixed position detection hole 23 of the upper detection disk 20.

Next, in the control circuit of FIG. 6, 24 is
The rotation speed and forward rotation detection photosensor, 2
5 is the photo sensor for detecting the reverse rotation, 26 is the photo sensor for detecting the fixed position, and each light emitting diode 2
7, 29, 31 and phototransistors 28, 30,
It consists of 32. Further, the lower detection disk 20 is an upper detection disk 19.

Photosensor 2 for detecting the rotational speed and forward rotation
The phototransistor 28 of No. 4 is a waveform shaping circuit 33
It is coupled to a data input terminal D of a flip-flop circuit 35 serving as a forward/reverse discriminator and a smoothing circuit 34 through a forward/reverse discriminator. The output side of the smoothing circuit 34 is connected via an integration circuit 36 and a buffer circuit 37 to the positive sides of two comparison circuits 38 and 39. A rotation speed setting circuit 40 made of a variable resistor is connected to the negative side of one comparison circuit 38, and a low speed setting circuit 41 for holding a fixed position is connected to the negative side of the other comparison circuit 39. The output side of the comparator circuit 39 is coupled via an inverter circuit 42 to a data input terminal D of a flip-flop circuit 43 serving as a stop signal output circuit.

The phototransistor 30 of the reverse rotation detection photosensor 25 is connected to the clock input terminal CK of the flip-flop circuit 35 via the waveform shaping circuit 44.
The output terminal Q of the flip-flop circuit 35 is connected to the flip-flop circuit 35 via a timer circuit 45, a comparator circuit 46, and a differentiator circuit 47.
A time setting circuit 48 is connected to the negative side of the comparison circuit 46.

The phototransistor 32 of the fixed position detection photosensor 26 is connected to the clock input terminal CK of the flip-flop circuit 43 via a waveform shaping circuit 49.
is combined with

Next, a human body sensor 50 is installed on the floor or ceiling in front of the door 2 and includes a pine switch, an ultrasonic sensor, a capacitance sensor, a phototube, etc. coupled to the reset terminal R of the flip-flop circuit 43 and to the timer circuit 52;
This timer circuit 52 is coupled to one output terminal Q of the flip-flop circuit 43.

Next, 53 is a commercial power supply, and this commercial power supply 53
is coupled to power transistors 56 and 57 and a voltage regulator 58 via a transformer 54 and a full-wave rectifier 55. The control end of the voltage regulator 58 is coupled to a switching transistor 60 via a brake regulating variable resistor 59, and the base of this transistor 60 is coupled to the output side of the comparator circuit 38. Further, at the output end of the voltage regulator 58, voltage dividing resistors 61 and 62 for high-speed stopping when the door 2 rotates in reverse, transistors 63 and 64,
Furthermore, Darlington connected transistors 65, 6
6 to the coil 13 of the electromagnetic brake 11. Further, the base of the transistor 63 is connected to the output side of the comparator 38, the other output terminal Q of the flip-flop circuit 43, and the output terminal Q of the flip-flop circuit 35, which are connected to diodes 68, 69, which form an OR gate 67, respectively.
70.

Next, the operation of the present invention will be explained.

First, an explanation will be given of the effect of deceleration when the rotational speed of the door 2 exceeds a certain level. Since the speed of the lower detection plate 19 also increases or decreases in accordance with the rotational speed of the door 2, a pulse signal having a period corresponding to the speed is outputted from the phototransistor 28. This pulse signal is waveform-shaped by a waveform shaping circuit 33 , smoothed by a smoothing circuit 34 , sent to an integrating circuit 36 , and further input to the positive side of a comparing circuit 38 via a buffer circuit 37 . Since the reference value is input from the rotation speed setting circuit 40 on the negative side, these two input signals are compared. When the input signal on the positive side is large, that is, when the rotation speed of the door 2 exceeds a certain level, an output is output from the comparator circuit 38, which turns on the transistor 60 and turns on the transistor 63 via the diode 68. Make it. When the transistor 60 is turned on, the voltage regulator 58 is activated, and the voltage is lowered so that the electromagnetic brake 11 can be operated slowly. Further, when the transistor 63 is turned on, the transistor 64 is turned off, and the Darlington-connected transistors 65 and 66 are turned on, so that the coil 13 is energized, and the brake plate 15 is moved against the leaf spring 1.
6, the brake 11 is applied, and the door 2
slows down. When the rotational speed of the door 2 decreases, the positive input of the comparator circuit 38 also decreases, so the output of the comparator circuit 38 disappears, and the transistors 60,
63 is turned off, the electromagnetic brake 11 is released and the door 2 rotates at a reduced speed.

Next, the revolving door is usually the door 2 on the right side in Figure 1.
Press and turn left in the diagram to enter and exit. If you accidentally push the door 2 on the left side in Figure 1 and try to rotate it to the right in the Figure, the rise of the output pulse of the phototransistor 30 due to the reverse rotation detection hole 22 will be more accurate as shown in Figure 4c. Since the rising edge of the output pulse of the phototransistor 28 of the rotation detection hole 21 is approximately 90 degrees ahead of the rising edge, an output appears in the flip-flop circuit 35, and this output is passed through the diode 70 to turn on the transistor 63, turn off the transistor 64, and turn off the transistor. 65 and 66 are turned on, and the electromagnetic brake 11 is activated. At this time, since the transistor 60 is off, the output voltage of the voltage regulator 58 is high, and the door 2 stops quickly. The output of the flip-flop circuit 35 simultaneously outputs the timer circuit 45.
is activated and, for example, after 3 to 10 minutes, when the time set by the setting circuit 48 has elapsed, an output is output from the comparator 46 and one pulse is output from the differentiating circuit 47.
The flip-flop circuit 35 is reset by the pulse signal, and the electromagnetic brake 11 is released. In addition,
When the motor rotates in the normal direction, the output of the flip-flop circuit 35 is reversed, so that the electromagnetic brake 11 is immediately released.

Next, when people have finished entering and exiting and the rotational speed of the door 2 has fallen below a certain level, it is desirable that the door 2 be stopped in a state substantially aligned with the end of the arcuate wall 3 as shown in FIG. To explain the effect at that time,
Every time the door 2 rotates 90 degrees, a pulse signal is output from the fixed position detection photosensor 26 installed on the upper detection disk 20, and the pulse signal is sent to the waveform shaping circuit 4.
The waveform is shaped in step 9 and input to the clock input terminal CK of the flip-flop circuit 43. Further, the pulses from the photosensor 24 for detecting rotational speed and forward rotation are integrated by the integrating circuit 36 as described above, and sent to one side of the comparator 39 via the buffer circuit 37.
A set value corresponding to the low speed at which the door 2 should be stopped is inputted to the other side of this comparator 39 by the low speed setting circuit 41, so it is compared with that value, and when the door 2 reaches the stopping speed, it is When the next output from the detection photosensor 26 is output and sent to the flip-flop circuit 43, an inverted output Q is output from the flip-flop circuit 43, transistor 63 is turned on, transistor 64 is turned off, transistors 65 and 66 are turned on, and the electromagnetic The brake 11 is activated and the vehicle stops at a fixed position. At the same time, the timer circuit 52 is set by the output of the flip-flop circuit 43. If there is no output from the body sensor 50 before the time-up time (for example, 8 minutes) of this timer circuit 52 elapses, a reset signal is sent via the diode 71 at the elapse of that time (8 minutes), and the output is used to reset the flip-flop circuit. 43. This timer circuit 52
When the output of the body sensor 50 appears before the time-up period elapses, the flip-flop circuit 43 is reset by the output via the diode 72 and the switching circuit 51, and the electromagnetic brake 11 is released.

In the above embodiment, as shown in FIG. 4, the lower detection disc 19 was provided with two rows of forward rotation detection hole group 21 and reverse rotation detection hole group 22, but as shown in FIG. There may be only the detection hole group 21a in the row,
In this case, when the forward rotation detection photosensor 24 is aligned with the detection hole 21a, the reverse rotation detection photosensor 25 is slightly (1 degree 7 minutes 30
sec) Install in an advanced position. If you do this,
The effect is similar to that shown in FIGS. 4b and 4c.

Next, another embodiment of the present invention will be described based on FIG. In the above embodiment, an electromagnetic brake is used,
This is directly connected to the rotating support 1, and the disc 1
9 and 20 were used, but in the example shown in Fig. 8,
A powder brake is used for the brake, and it is connected to the rotating column 1 through a gear, and the disc is made of a single piece. More specifically, a speed control device 4 is fixed to the upper end of the rotating support 1 of the door 2, and this speed control device 4 has a shaft 6 perpendicular to the case 5 supported by upper and lower bearings 7, 8.
The lower protruding portion 9 of the shaft 6 is fixed to the rotating support 1.
A bevel gear 76 is fixed to the shaft 6, and this bevel gear 76 meshes with a bevel gear 77 fixed to a shaft 82 of a powder brake 78, and the gear ratio of these bevel gears 76 and 77 is, for example, 4:1. Set. The powder brake 78 has magnetic iron powder 81 between a rotor 79 connected to the shaft 82 and rotating, and a stator 80 fixed opposite to the rotor 79.
, and an electromagnetic coil 13 is provided on the stator 80 side. A detection disk 83 is provided on the 82 so as to rotate together with the shaft 82, and this disk 83 is designed so that one disk is sufficient instead of the two disks 19 and 20 shown in FIGS. 4 and 5. A detection hole is drilled near the outer periphery. Incidentally, the detection hole can also be formed as shown in FIG. Three photosensors 2 are placed facing the outer periphery of this disk 83.
4, 25, and 26 are provided. These photosensors 24, 25, and 26 may be separate bodies or may be housed in the same housing.

Next, since the operation of the embodiment shown in FIG. 2 is the same as that of the first embodiment except for the powder brake 78, only the operation of the powder brake 78 will be explained. coil 1
3 is not excited, the magnetic iron powder 81 inserted between the rotor 79 and the stator 80 exists only as a powder and has no effect on the rotation of the rotor 79. The rotor 79 continues to rotate.
Next, when the electromagnetic coil 13 is excited, the magnetic iron powder 81 is connected in a chain between the rotor 79 and the stator 80, resistance is generated between the rotor 79 and the stator 80, and the brake is applied. It will be done. This resistance is coil 13
The braking force is approximately proportional to the excitation current, and the braking force can be easily controlled simply by controlling the excitation current. In the embodiment, holes 21, 22, 23 are used as signal generators.
are provided, whereby the photosensors 24, 25, 2
6, a pulse signal is generated, but the present invention is not limited to this, and any device that generates pulses, such as a magnet and a Hall element, may be used.

In the above embodiment, the case of a revolving door that is rotated manually has been described, but it can also be used as is for a revolving door that is rotated by a motor or the like.

[Effects of the invention] (1) When the rotational speed of the revolving door exceeds a certain level, the rotational speed is detected and the brakes are applied to reduce the speed, thereby preventing accidents such as bodies or luggage getting caught between the door and the wall. can be prevented.

(2) Since the detected speed is detected as a pulse by a photo sensor and the waveform is shaped, a change in speed is detected as a change in period with a constant pulse width. Furthermore, since this is smoothed and then output as an integral value of voltage, the change in speed is extremely accurate.

(3) When the detected value exceeds the reference voltage value, it is output from the comparison circuit, and the electromagnetic brake can be adjusted so that it responds quickly and yet gently.
The door will not suddenly stop and cause injury or property damage.

(4) The rotational speed detector is equipped with a detection disk on the rotating shaft with rotational speed detection holes provided at regular intervals around the entire circumference, a photo sensor facing this detection disk, and a photo sensor that detects the waveform. Since the circuit is connected in sequence to a shaping circuit, a smoothing circuit, and an integrating circuit, the circuit construction is simple and the circuit operates reliably.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the speed control device for a revolving door according to the present invention, FIG. 2 is a sectional view of an electromagnetic brake part and a rotational speed detection part, and FIG. 3 is a line A-A in FIG. 2. Line sectional view, Figure 4a is a plan view of the lower detection plate, Figure 4b is an explanatory diagram showing the relationship between the detection hole and output pulse during forward rotation, and Figure 4c is the detection hole and output during reverse rotation. FIG. 5 is a plan view of the upper detection plate, FIG. 6 is a block diagram of the control circuit, FIG. 7 is a partial plan view of another embodiment of the lower detection plate, and FIG. The figure is a sectional view showing another embodiment of the speed control device. 1... Pillar, 2... Door, 3... Arc-shaped wall, 6...
Shaft, 11... Electromagnetic brake, 19... Lower detection disc, 20... Upper detection disc, 21... Forward rotation detection hole, 22... Reverse rotation detection hole, 23... Fixed position detection hole, 24...Sensor for detecting rotation speed and forward rotation, 25...Sensor for detecting reverse rotation, 26...Sensor for detecting fixed position, 35...Flip-flop circuit as a discrimination section, 36...Integrator circuit, 38...
Comparator, 39...Comparator, 40...Rotation speed setting circuit, 41...Fixed position stop speed setting circuit, 43...
...Flip-flop circuit as a stop signal output circuit, 50...Human body sensing section, 52...Timer circuit,
53...Power supply, 60, 63...Transistor as a switching circuit.

Claims (1)

[Scope of utility model registration request] A plurality of doors are attached to a rotatable support in a radial manner with a predetermined center angle, and the doors rotate along the arcuate walls on both sides. A rotation speed detector and an electromagnetic brake are provided to detect the rotation speed of the shaft and output it as an electric signal, and the rotation speed detector detects the rotation speed around the entire circumference near the outer periphery of the shaft that rotates in conjunction with the column. A detection disk with holes arranged at regular intervals is provided, and a photo sensor is provided facing this detection disk.
This photo sensor is sequentially connected to a waveform shaping circuit, a smoothing circuit, and an integrating circuit, and this rotational speed detector and a separately provided rotational speed setting circuit are connected to a comparator, and on the output side of this comparator, A switching circuit is connected to control the electromagnetic brake voltage regulator and to excite the electromagnetic brake coil, and the voltage of the voltage regulator is applied to the electromagnetic brake when the rotation speed of the door exceeds a set value. A speed control device for a revolving door, characterized in that it adjusts and decelerates the speed of a revolving door.