JPH0455178Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a brake malfunction detection device for an automatic door, and more particularly to a device for detecting malfunction of a brake means for decelerating the door speed in an automatic door.

"Prior Art and Problems" The operation of an automatic door is to first move the door to a predetermined position at a relatively high speed, then activate the braking means to reduce the speed, and finally open the door completely or completely at a relatively low speed. 3. Close and move.
Generally, it is carried out based on steps; for example, in Japanese Patent Application Laid-open No. 58-80082, such three
A preferred method of controlling the actuation of the braking means in a stepwise manner is disclosed.

By the way, if a failure occurs in the operation of the braking means, the deceleration stage will not be performed among the three stages mentioned above, and the door will suddenly shift from high speed to low speed, or will remain at high speed and will not fully open or close completely. position, impacting the door mechanism,
The failure may also spread to components other than the brake means.

Therefore, it is preferable to discover defects in the braking device at an early stage, but because conventional automatic door devices do not have a device to detect defects in the braking device, it is always too late for people to notice that the braking device is defective. There's a problem.

[Object of the invention] An object of the invention is to provide a device that can immediately detect and notify malfunction of the brake means in an automatic door device.

"Structure of the Invention" The automatic door brake defect detection device of the present invention drives the motor at a relatively high speed until shortly before the door moved by the motor is fully opened or completely closed, and then the brake means is at least activated. 1
In an auto door that operates the door twice, decelerates, fully opens or completely closes and drives the motor at a relatively low speed to open or close the door, the speed pulse outputs a speed pulse signal at time intervals inversely proportional to the door speed. a signal output means, a pulse interval detection means for detecting the time interval of the speed pulse signal, a time interval storage means for storing the time interval detected by the pulse interval detection means, a time interval of the pulse signal obtained at a certain time and the time interval thereof. Brake failure signal output means that compares the time interval of the pulse signal previously obtained and stored for the period during which the brake is operated and outputs a brake failure signal when the former becomes smaller than the latter or remains equal. , and an alarm means for issuing an alarm when the brake failure signal is output.

In the above configuration, the braking means includes not only an independent braking device such as a brake shoe, but also a case where the motor functions as a brake by dynamic braking.

Further, in the above configuration, the speed pulse signal output means may be configured to output a pulse signal by magnetically or optically detecting the teeth of a gear that rotates due to the movement of the door, for example.
Alternatively, it may be configured to output pulses in synchronization with the rotation of a motor that drives the door. Furthermore, other known means may be used. In short, it is sufficient if the door outputs more pulses as the speed of the door increases. In addition, the pulse waveform is
Not particularly limited.

The pulse interval detection means can be configured as a digital circuit using a clock circuit and a counter circuit, for example, or can be configured as an analog circuit using an integrating circuit. Furthermore, instead of using such hardware, it may be configured as software using a computer.

The time interval storage means may be constituted by a latch circuit, for example, or may be constituted by using a part of the memory of the computer.

The brake failure signal output means may be configured in hardware by combining a comparison circuit and a gate circuit, or may be configured in software by a computer.

Alarm means include lamps, buzzers, and CRTs.
One example is the display. Particularly preferred is one that can identifiably notify that the brake is defective.

Note that for the components of the automatic door device other than those mentioned above, such as a visitor sensor, a door position sensor, a motor, and a motor drive control means, conventionally known means used in this field can be used.

If the braking means is operating normally, the door speed should decrease and the time interval of the speed pulse signals should increase. The time intervals of the speed pulse signals are then compared, and if they become shorter during the braking period or remain the same, it can be determined that the braking means is abnormal. The brake defect detection device of the present invention is configured to suitably perform this determination.

``Example'' This invention will be further explained in detail below based on an example of the invention shown in the drawings. Here, Fig. 1 is an explanatory diagram of the configuration of an automatic door device including a brake defect detection device according to an embodiment of this invention, Fig. 2 is a circuit diagram of the central control section of the auto door device shown in Fig. 1, and Fig. 3 is an operational diagram. This is a flowchart.

In the automatic door device 1 shown in FIG. 1, the door 2 is fixed to a belt 3 and is moved by a motor 4 via the belt 3. Movement to the left in the drawing is the opening direction of the door 2, and movement to the right is the closing direction of the door 2. The first limit switch LS ₁ is turned on when the door 2 is between a little before the door 2 is fully open and when the door is fully open. 2, the second limit switch LS ₂ is turned on. When these limit switches LS ₁ or LS ₂ are turned on, the door position signal
L ₁ or L ₂ becomes "1". Matsuto Switch MS
When stepped on by a visitor, the mat signal M ₁ =
Outputs "1".

The speed pulse signal output means 5 outputs a speed pulse signal _Q1 in synchronization with the rotation of the motor 4,
In other words, the speed pulse signal _Q1 is output every predetermined amount of door movement. So the speed pulse
The time interval _Q1 is inversely proportional to the moving speed of door 2. Now, in this automatic door device 1, the interval between adjacent pulses of the speed pulse signal _Q1 corresponds to the movement of the door 2 by 3 mm.

The speed pulse signal output means 5 also outputs a speed pulse signal _Q2 . This speed pulse signal Q ₂ is basically the same signal as the above speed pulse signal Q ₁ ,
However, the phases are different, and when the motor 4 is rotating in the door opening direction, it rises later than the rise of _Q1 , and conversely, when the motor 4 is rotating in the door closing direction, it starts before the rise of _Q1 . It rises to "1".

The motor drive control unit 6 receives a motor rotation direction signal f ₁ and a speed signal f ₂ from the central control unit 10,
Based on this, motor 4 is opened at high speed (door speed
V ₁ ), slow opening (door speed V ₂ ), fast closing (door speed
V ₃ ), low-speed closing (door speed V ₄ ), pressing (generating a weak pressing torque T in the closing direction), or free (torque 0) mode, outputs the motor drive signal d. It is something. Now, in this automatic door device 1, V ₁ = 200 mm/sec, V ₂ = 67 mm/sec, V ₃ = 143
mm/sec, V ₄ = 48 mm/sec, T = 16 Kgcm, and as a result, the time interval of the speed pulse signal Q ₁ is 15 msec when opening at high speed, 45 msec when opening at low speed, and 21 msec when closing at high speed. , 63msec when closing at low speed.

Further, the motor drive control section 6 includes a central control section 10.
It has the function of receiving a brake signal f ₃ from the motor 4, outputting a braking signal b based on this signal, and applying a brake to brake the rotation of the motor 4.

The alarm 7 is a means for receiving the alarm signal _a1 from the central control unit 10 and issuing a warning to the operator by flashing a lamp or intermittent buzzer.

FIG. 2 shows a detailed circuit of the central control unit 10. In this circuit, the rising one-shot circuit 12 to which the speed pulse signal _Q1 is input and the output of the rising one-shot circuit 12 are input through delay circuits 26 and 27. The speed counter 13 constitutes a pulse interval detection means for detecting the time interval of the speed pulse signal _Q1 , and the maximum output value of the speed counter 13 is the quotient obtained by dividing the time interval of _Q1 by the clock period. Therefore, the clock period is
Assuming that it is set to 1 msec, the maximum value will be output from the speed counter 13 as ``15'' when opening at high speed, ``45'' when opening at low speed, ``21'' when closing at high speed, and ``63'' when closing at low speed. becomes.

The decoders 14, 15 and 16 set the output to ``1'' when the output value of the speed counter 13 reaches ``45'', ``63'' and ``300'', respectively, and set the corresponding flip-flops, that is, low speed open flags.
7. Set the low speed close flag 18 and stop flag 19 to "1". These three pairs of decoders and flags constitute low-speed signal output means for detecting whether the door is opened at low speed, closed at low speed, or substantially stopped. In other words, low speed open flag 1
7 being set to "1" indicates that the door speed has fallen below the slow opening speed. Similarly, the low speed close flag 18 is “1”
indicates that the door speed has fallen below the slow closing speed. "1" in the stop flag 19 indicates that the door speed has become less than 10 mm/sec, but since the door speed during normal movement will never become less than 10 mm/sec, this indicates that the door speed has become less than 10 mm/sec. This is done to detect the stoppage of movement. As will be described later, the stop flag 19 also serves as a flag for abnormally low speed detection, and together with the microcomputer 11 constitutes abnormally low speed detection signal output means.

The output of the speed counter 13 is input to the current value latch 28, the output of the current value latch 28 is input to the previous value latch 29, and the output of the current value latch 28 is input to the previous value latch 29.
The output signal of 2 first becomes the latch input of the previous value latch 29, then becomes the latch input of the current value latch 28 with a slight delay in the delay circuit 26, and then becomes the latch input of the current value latch 28 with a slight delay in the delay circuit 27.
3 reset input. As a result, the current value latch 28 stores the maximum output value of the immediately preceding speed counter 13, and the previous value latch 29 stores the maximum output value of the immediately preceding speed counter 13. In this sense, these latches 28, 29 constitute time interval storage means.

Comparator 30 outputs the output value of current value latch 28.
Compare Y ₁ and the output value Y ₂ of the previous value latch 29, and Y ₁
Outputs “1” when ≦Y ₂ . This means that the time interval of the speed pulse signal Q ₁ becomes smaller or does not change, that is, the speed of the door 2 increases or does not change. As described later,
This comparator 30 and the microcomputer 11 constitute brake failure signal output means.

The cutting counter 31 is an up-down counter that counts up the speed pulse signal _Q1 when the output of the rotation direction flag 34 is "0";
When the output of the rotation direction flag 34 is "1", it counts down to the speed pulse signal _Q1 . As mentioned above, when the motor 4 is rotating in the door opening direction, _Q2 rises later than the rise of _Q1 , so the output of the rotation direction flag 34 is "0", and conversely, the motor 4 is rotating in the door closing direction. Q ₁ when rotating to
Since _Q2 rises before Q2 rises, the output of the rotation direction flag 34 is "1". In other words, the cutting counter 31 is a pulse counting means that counts up the speed pulse signal Q1 while the motor 4 is rotating in the opening direction, and counts down the speed pulse signal _Q1 while the motor 4 is rotating in the closing direction.

The decoders 32, 32' output an output and set the disconnection flag 33 to "1" when the output value of the disconnection counter 31 reaches a corresponding predetermined value. The predetermined value corresponding to the decoder 32 is the door 2
The output value of the cutting counter 31 is set to a value larger than the output value of the cutting counter 31 when the cutting counter 31 moves to the fully closed or fully opened position. Further, the predetermined value corresponding to the decoder 32' is set to the complement of the predetermined value corresponding to the decoder 32 (meaning that the sign is negative). As a specific example, the stroke from fully closed to fully open door 2 is, for example, 3000 mm.
If the speed pulse signal _Q1 is output every 3 mm of movement of the door 2, the count value of the cutting counter 31 will be "1000", so the decoder 32,
The predetermined values of 32' are, for example, "1200" and "-1200".
are set respectively. The cutting counter 31 counts up when the door opens, but counts down when the door closes, so its output value is always between "-1000 and 1000" in the above-described specific example.
Therefore, if it becomes “-1200” or “1200”
If this happens, it means that the motor 4 is rotating regardless of the movement of the door 2, and the cause is considered to be a break in the belt 3. In this way, the decoders 32, 32' and the cutting flag 33 constitute abnormality signal output means that outputs a signal when the belt is abnormally cut.

The output value of the cutting counter 31 is input to the microcomputer 11, and the microcomputer 11 detects a slip in the belt 3 from the output value, as will be described later. That is, the cutting counter 31 and the microcomputer 11 are
It constitutes an abnormality signal output means that detects belt slip and outputs a signal.

The visitor flag 20 is a flip-flop that is set when the mat signal M ₁ = "1", and is set for a predetermined period of time, for example, 2 after the mat signal M ₁ becomes "0" via a rise one shot circuit 21 and a delay circuit 22. It will be reset after a delay of seconds.

The speed counter 13 and each flag 17,1
8 and 19 as well as the cutting counter 31 and cutting flag 33 are arbitrarily reset by the output pulses m and u of the microcomputer 11. Further, the visitor flag 20 is arbitrarily set by the output pulse m. Furthermore, microcomputer 11
The visitor flag 20 and the delay circuit 22 are arbitrarily reset by the output pulse n.

The microcomputer 11 is the central part of the automatic door device 1, and in addition to inputting and outputting with the peripheral circuits mentioned above, it reads door position signals L ₁ and L ₂ and also sends a motor rotation direction signal f ₁ to the motor drive control unit 6. , speed signal f ₂ , and brake signal f ₃ are output.

Also, there is an abnormality counter 11a that counts when the closing operation of the door 2 is interrupted, and a close register 1 that stores the output value of the disconnection counter 31 at the fully closed position of the door.
1c and the cutting counter 31 in the fully open position of the door.
The open register 11b stores the output value of . Also, alarm signal to alarm 7
a Outputs ₁ .

Hereinafter, the operation of the microcomputer 11 will be explained as follows.
This will be explained with reference to the figures.

When the initial position of the door 2 is set to the fully closed position and the operation of the device 1 is started as shown in FIG.
A sufficiently large value such as "2000" is set for b, and its complement "-2000", that is, a sufficiently small value, is set in the closed register 11c. Next, the rotational direction of the motor 4 is set to the "opening direction" by the signal f ₁ , the speed is set to "0" by the signal f ₂ , and the brake is set to "off" by the signal f ₃ , so that the door 2 in the initial state is set to the free state. do. Next, the output pulse n is outputted to reset the visitor flag 20 and the delay circuit 22, and in this state, it waits for the visitor flag 20 to be set.

When a visitor steps on the mat switch MS and the mat signal _M1 becomes "1", a visitor flag 20 is set. When this is detected, output signals m and u are output to reset the speed counter 13 and flags 17, 18, 19, cutting counter 31 and cutting flag 33. At this time, the output signal m is also input to the OR gate 24, but since the mat signal " _M1 " is "1", it has no effect. After output signal m is output, door position signal L ₁
If L ₁ =0, the mode shifts to the high-speed opening mode, and if L ₁ =1, the door 2 is already at a position closer to fully open than the first limit switch _LS1 , so the mode shifts to the low-speed opening mode. However, since door 2 is initially started from the fully closed position,
Always in high-speed opening mode.

As shown in Figure 3b, in the high-speed opening mode, the motor rotation direction is the "opening direction" and the speed is "V ₁ ".
and turn the brake off. As a result, the door 2 starts opening at a speed of V _1. The high-speed opening mode ends when it is detected that the door 2 has opened to the first limit switch LS ₁ with L ₁ = 1, or when the visitor leaves the Matsuto switch MS. There are four cases: when the visitor flag 20 is detected as "0", or when the stop flag 19 becomes "1", or when the disconnection flag 33 becomes "1". It is done either way. In the first case, since the opening stroke of door 2 is near the end,
In the second case, since there is no longer a visitor, there is no need to continue the opening operation, so the opening braking mode is entered. In the third case, it is abnormal for the speed of door 2 to be less than 10 mm/sec during high-speed open mode, and it is determined that something is preventing door 2 from moving, so the system switches to abnormal free mode. Transition. In the fourth case, it is determined that the belt 3 has been cut and the motor 4 is idling, so the mode shifts to the abnormal cutting mode.

As shown in FIG. 3c, in the open braking mode, the brake is turned on without changing the state of the motor 4. The open braking mode ends when the low speed open flag 17 becomes "1" or when the disconnection flag 33 becomes "1".
This is done in one of three cases when the comparator 30 becomes "1". In the first case,
This is when the brake is operating normally and the speed decreases, but when the low speed opening flag 17 detects that the door speed has reached V ₂ , the visitor flag 20 is checked to see if there are any visitors. If there is, it will shift to low speed opening, and if it is not there, it will shift to reverse closing braking mode since there is no longer a need to continue the opening operation. In the second case, it is determined that the belt 3 is cut, and the mode shifts to the abnormal cutting mode. In the third case, door 2 during braking
This means that the speed of the vehicle has increased or does not change, which means that the brakes are not working properly and the brake abnormality mode is entered.

Note that braking control is performed as follows. That is, the microcomputer 11 outputs the brake signal _f3 at a predetermined duty ratio, reads the output value of the cutting counter 31 in that state, reads the output value of the cutting counter 31 again after a predetermined time, and
The difference is compared with a preset reference value, and if the former is larger than the latter, it is determined that the brake effect is small and the duty ratio is increased.
Conversely, if the former is smaller than the latter, it is determined that the brake effect is greater and the duty ratio is reduced.
As a result, the braking effect is automatically and appropriately adjusted even when the situation changes, so that the desired smooth movement of the door 2 can always be obtained.

Now, as shown in Fig. 3d, in the low speed opening mode, the brake is turned off and the door 2 moves at a speed of V ₂
The motor 4 is controlled so as to open the door at . On the other hand, in the reverse closed braking mode, the motor 4 is stopped and the brake continues to be "on". As a result, in the normal case, the opening stroke of the door 2 is completed in the low speed opening mode, while the movement of the door 2 is stopped due to the brake in the reverse closing braking mode. When this is detected by the stop flag 19, the system shifts to the normal free mode. However, if the belt 3 is cut, the motor 4 continues to idle and the output value of the cut counter 31 becomes large, and the stop flag 19
is not "1" and the disconnection flag 33 becomes "1". At this time, the mode shifts to disconnection abnormality mode.

As shown in FIG. 3e, in the normal free mode, the motor 4 is stopped, the brake is turned off, and the door 2 is placed in a free state. In this state, door 2 has normally reached the fully open position, so
The output value of the cutting counter 31 represents the number of speed pulse signals Q ₁ corresponding to the full stroke of the door 2 from fully closed to fully opened. Therefore, the value of the disconnection counter 31 at this time is read, and this is compared with the value previously stored in the open register 11b. If the read value is smaller, a value larger than the read value by a predetermined value is set in the open register 11b. . This predetermined value can be determined based on the allowable slip length of the belt 3. For example, if the allowable slip length is 9 mm and the speed pulse signal _Q1 is output every 3 mm of movement of the door 2. Then, it becomes "3". Therefore, if the read value of the cutting counter 31 is "1000", it will be "1003".
is set in the open register 11b.

Since the value initially stored in the open register 11b is a sufficiently large value as described above, the first read value is always smaller than that value. The comparison between the stored open register 11b value and the read disconnection counter 31 value is meaningless the first time. However, it becomes meaningful after the second time. That is, in the second comparison, the previously stored value of the open register 11b, for example, the above-mentioned example value "1003", is compared with the value of the cutting counter 31, but at this time, it is assumed that the belt 3 has slipped by 9 mm or more. In this case, the value of the disconnection counter 31 becomes "1003" or more, and the state shifts to the opening slip abnormality mode. In this way, by comparing the value of the open register 11b and the value of the cutting counter 31, it is possible to detect a slip abnormality in the belt 3.

If there is no belt slip, open register 11b
The value is updated to a value larger than the read value of the disconnection counter 31 by a predetermined value. While the visitor flag 20 is "1", it means that the visitor is still on the Matsuto switch MS, so the door 2 remains free.

When the visitor flag 20 becomes "0" and it is detected that there is no visitor, output pulses m, u, n are continuously output in this order, and the flag 1 is
7, 18, 19, 20, speed counter 13, cutting counter 31, cutting flag 33, and delay circuit 22 are reset. Then the door position signal
When L ₂ is read, if L ₂ = 0, the mode shifts to high-speed opening mode, and if L ₂ = 1, the door 2 is closer to the position of the second limit switch LS ₂ , so the mode shifts to low-speed closing mode. . However, since it is initially assumed that the opening is fully opened to set the open register 11b, the high-speed opening mode is always set.

As shown in Fig. 3f, in the high-speed opening mode, the motor rotation direction is set to the "closing direction" and the speed is set to "V ₃ ".
and turn the brake off. As a result, the door 2 starts its closing operation at a speed _V3 . The high-speed opening mode ends when it is detected that the door 2 has been closed to the second limit switch LS ₂ by L ₂ = 1, or when it is detected by the visitor flag 20 being "1" that a visitor has stepped on the Matsuto switch MS. This is performed in one of four cases: 1, when the stop flag 19 becomes "1", or when the disconnection flag 33 becomes "1". In the first case, the closing stroke of the door 2 is near the end, and in the second case, the door 2 is opened because a visitor has arrived, so the closing braking mode is entered. In the third case, it is abnormal for the speed of door 2 to be less than 10 mm/sec during high-speed closing mode, and it is determined that something is blocking the movement of door 2, so the mode is set to abnormal reversal mode. Transition. In the fourth case, it is determined that the belt 3 has been cut and the motor 4 is idling, so the mode shifts to the abnormal cutting mode.

As shown in FIG. 3g, in the closed braking mode, the brake is turned "on" without changing the state of the motor 4. The closed braking mode ends when the low speed close flag 18 becomes "1" or when the disconnection flag 33 becomes "1".
This is done in one of three cases when the comparator 30 becomes "1". In the first case,
When the brake operates normally, the door speed decreases, but when the slow closing flag 18 detects that the door speed has reached _V4 , the visitor flag 20 checks whether there are any visitors and If there is no one, the mode shifts to low-speed closing mode, and if there is, it shifts to reverse opening braking mode since it is necessary to open door 2. In the second case, it is determined that the belt 3 is cut, and the mode shifts to the abnormal cutting mode. The third case means that the speed of the door 2 increases or does not change during braking, and it is determined that the brake is not working normally, so the brake abnormality mode is entered.

As shown in FIG. 3h, in the slow closing mode, the brake is turned off and the motor 4 is controlled so that the door 2 closes at a speed _V4 . On the other hand, in the reverse open braking mode, the motor 4 is stopped and the brake continues to be "on". As a result, in the normal case, the closing stroke of the door 2 is completed in the low-speed closing mode, and on the other hand, the movement of the door 2 is stopped due to the brake in the reverse opening braking mode. When this is detected by the stop flag 19, the presence or absence of a visitor is checked by the visitor flag 20, and if there is no visitor, the mode shifts to the pressing mode, and if there is, the mode shifts to the halfway opening mode shown in FIG. 3a in order to open the door 2 again. Transition. However, if the belt 3 is cut, the motor 4 continues to idle and the output value of the cut counter 31 increases, and the stop flag 19 does not become "1" but the cut flag 33 becomes "1". At this time, the mode shifts to disconnection abnormality mode. Note that in the mid-open mode, the same process as when a visitor is detected in the start mode is repeated, so a description thereof will be omitted.

As shown in Figure 3i, in the pressing mode,
Let the motor rotation direction be the "opening direction", the torque be "T", and the brake be "off". As a result, the motor drive control unit 6 lowers the voltage supplied to the motor 4, thereby causing the motor 4 to generate a weak torque T in the door closing direction. As a result, the door 2 is pressed against the door stop with such force that it can be easily opened by hand, and the sealed state of the door 2 is maintained. Although the motor 4 cannot rotate, only enough power is supplied to generate a weak torque T, so there is no risk of burning out due to overload. In this state, the door 2 has normally reached the fully closed position, so the output value of the cutting counter 31 is the number of speed pulse signals Q ₁ corresponding to the full stroke of the door 2 from fully open to fully closed. It represents. However, it is a negative number for countdown, and is expressed as a complement. Therefore, the value of the cutting counter 31 at this time is read and compared with the value previously stored in the close register 11c. If the read value is smaller, a value smaller than the read value by a predetermined value is set in the close register 11c. do. This predetermined value can be determined based on the allowable slip length of the belt 3. For example, if the allowable slip length is 9 mm and the speed pulse signal _Q1 is
If it is output every mm movement, it will be 3. Therefore, the read value of the disconnection counter 31 is "-"
1000”, “-1003” is the closed register 11c
is set to

Since the value initially stored in the closed register 11c is a sufficiently small value as described above, the first read value is always larger than that value. Therefore, the comparison between the previously stored value of the close register 11c and the read value of the disconnection counter 31 is meaningless the first time. However, it becomes meaningful after the second time. That is, in the second comparison, the previously stored value of the close register 11c, for example, the above-mentioned example value "-1003", is compared with the value of the cutting counter 31, but at this time, if the belt 3 slips by 9 mm or more, If so, the value of the disconnection counter 31 will be "-1003" or less, and the state will shift to the slip-on-close abnormality mode. Close register 1 like this
A slip abnormality in the belt 3 can be detected by comparing the value of 1c and the value of the cutting counter 31.

If there is no belt slip, close register 11c
The value of is updated to a value smaller by a predetermined value than the read value of the cutting counter 31, and the state shifts to the open standby mode shown in FIG. 3a. Since the open standby mode is the same as the process of waiting for a visitor in the start mode, the explanation will be omitted.

Figure 3j shows the processing in the abnormal free mode and abnormal reversal mode. In the abnormal free mode, the motor rotation direction is set to the "opening direction," the speed is set to "0," the brake is set to "off," and the door 2 is turned off.
to a free state. Next, the alarm signal _a1 is outputted, and the alarm 7 is caused to repeatedly emit a warning sound. In this state, wait until the visitor flag 20 is reset once, and then the third
Shifts to the open standby mode shown in Figure a. This is to ensure that customers are asked to leave the Matsuto Switch MS for safety in the event that something goes wrong.

On the other hand, in the abnormality reversal mode, the abnormality counter 11
a is incremented, and if the number of abnormalities is less than a predetermined number, for example, three, an output pulse m is output and the mode shifts to the halfway open mode shown in FIG. 3a. As a result, the door 2 is reversed into an opening operation. Since the output pulse m falls instantaneously, the door 2 will close again after a delay time in the delay circuit 22, but if the cause of the previous abnormality has not been resolved at this time, it will go into the abnormal reversal mode again and the same operation will occur. things are repeated. When the repetition reaches a certain number of times,
Repeating opening and closing any further is pointless, so
Shift to abnormal free mode. In other words, after the abnormal reversal is repeated a predetermined number of times, the door 2 becomes free. If the cause of the abnormality is resolved before the predetermined number of times is reached, the door 2 will return to its normal closing position as shown in Figure 3a.
Since the abnormality counter 11a is reset at this time, an initial normal standby state is entered.

FIG. 3k shows processing in the abnormal cutting mode, in which the motor 4 is immediately stopped and the brake is turned off. Next, the alarm signal _a1 is output, the alarm 7 repeatedly emits a warning sound, and the operation of the automatic door device 1 is stopped in this state.

FIG. 3 shows processing in the brake abnormality mode, in which the motor 4 is immediately stopped and the brake is turned off. Next, the alarm signal _a1 is outputted to cause the alarm 7 to repeatedly emit a warning sound beep, and in this state, the operation of the automatic door device 1 is stopped.

Fig. 3m shows the processing in the slip-on-open abnormality mode, in which a beeping alarm is emitted for a predetermined period of time, but since there is no need to stop the operation of the automatic door device 1, the closed standby mode shown in Fig. 3e to move to.

FIG. 3n shows the processing in the slip-on-close abnormality mode, in which an alarm beep is emitted for a predetermined period of time, but since there is no need to stop the operation of the automatic door device 1, the open standby mode shown in FIG. 3a is used. to move to.

As described above, this automatic door device 1 detects the breakage of the belt 3, stops operation, and issues an alarm. Furthermore, a slip in the belt 3 is detected early and a warning is issued. Since the dial tone has a specific pattern determined depending on the cause of the abnormality, the operator can easily know the cause of the abnormality.

In another embodiment, the door position sensor LS ₁ determines the door position from the speed pulse signal;
Examples include those in which the LS ₂ is omitted, those in which a hot wire sensor or radar sensor is used in place of the Matsuto switch MS, and those in which the central control unit 10 is configured with a hardware circuit without using the microcomputer 11.

"Effect of the invention" As can be understood from the above explanation, the automatic door brake failure detection device of this invention operates at a relatively high speed until shortly before the door moved by the motor is fully opened or completely closed. In an automatic door, the motor is operated at least once to decelerate the door, and then the motor is driven at a relatively low speed to fully open or close the door to open or close the door. Speed pulse signal output means for outputting speed pulse signals at time intervals; pulse interval detection means for detecting the time intervals of the speed pulse signals; time interval storage means for storing the time intervals detected by the pulse interval detection means; and a certain time. Compare the time interval of the pulse signal obtained before with the time interval of the pulse signal obtained and stored earlier for the period during which the brake is applied, and when the former becomes smaller than the latter or remains equal. The system includes a brake failure signal output means for outputting a brake failure signal, and an alarm means for issuing an alarm when the brake failure signal is output. According to this, an alarm is issued immediately when a brake failure occurs. Since the information is sent, it is possible to take early action and improve reliability.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the configuration of an automatic door device including a belt abnormality detection device according to an embodiment of this invention;
This figure is a circuit diagram of the central control section of the automatic door device shown in FIG. 1, and FIG. 3 is a flowchart of the operation. Explanation of symbols: 1...Auto door device, 2...Door, 3...Belt, 4...Motor, 5...Speed pulse signal output means, 6...Motor drive control unit, 1
0...Central control unit, 11...Microcomputer, 11a...Abnormal counter, 11b...Open register, 11c...Closed register, 12...Rising one shot circuit, 13...Speed counter, 14~
16, 32, 32'...Decoder, 17-20,
33, 34...Flag, 21...Falling one shot circuit, 22, 26, 27...Delay circuit,
28, 29...Latch circuit, 30...Comparator, 31...Disconnection counter.

Claims (1)

[Claims for Utility Model Registration] The motor is driven at a relatively high speed until shortly before the door moved by the motor is fully opened or closed, and then the brake means is activated at least once to decelerate the door and completely close the door. In an automatic door that opens or closes the door by driving the motor at a relatively low speed when opening or completely closing the door, a speed pulse signal output means outputs a speed pulse signal at a time interval inversely proportional to the door speed; Pulse interval detection means for detecting the time intervals of the signals; time interval storage means for storing the time intervals detected by the pulse interval detection means; A brake failure signal output means compares the time interval of the pulse signal with the time interval during which the brake is operated and outputs a brake failure signal when the former becomes smaller than the latter or remains equal, and the brake failure signal outputs a brake failure signal. A brake defect detection device for an automatic door, characterized by comprising an alarm means that issues an alarm when an alarm is output.