JPH09240936A - Elevator control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator control device for judging it as brake abnormality when gap length between a brake shoe and a brake drum is not maintained at the time of brake opening motion by a brake opening command. SOLUTION: A brake release confirmation relay 13 does not work and detects that there is a gap when brake shoe side electrodes 11a, 11b installed on a pair of brake shoes 1a, 1b and a brake drum side electrode 12 to make contact with the respective brake shoe side electrodes 11a, 11b in the state where the brake shoes 1a, 1b pressurize a brake drum 2 are non-contact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an elevator control device having a brake abnormality detecting function of a brake device directly connected to an electric motor for raising and lowering an elevator car.

[0002]

2. Description of the Related Art Generally, in a climbing elevator, an elevator car is driven by the rotation of an electric motor in a hoisting machine, but a braking device is directly connected to the electric motor. For example, the drum-type electromagnetic brake includes a brake drum that is directly connected to the electric motor and rotates together with the rotation of the electric motor, and a pair of brake shoes that actuate the brake by pressing the brake drum from both sides. When the brake release command is the on command, the brake shoe is separated from the brake drum to open the brake drum. On the other hand, when the brake release command is the off command, the brake shoe is pressed to press the brake drum. I try to prevent the rotation of.

FIG. 8 shows such a brake device. The brake shoe 1 presses the brake drum 2 to prevent the rotation of the brake drum 2 or separates from the brake drum 2 to open the brake drum 2 in response to an ON command or an OFF command of a brake release command (not shown). . The brake shoe 1 is attached to a fixed portion so that the brake drum 2 is pressed from the left and right sides. Further, the brake drum 2 is directly connected to the rotating shaft 3 of the electric motor, and rotates together with the electric motor. The rotary shaft 3 is a rotary shaft of a hoisting machine including an electric motor,
The elevator car speed is determined by the rotation speed of the rotary shaft 3.

Next, the brake coil 4 draws a current when the brake release command is an on command and attracts the brake shoe 1 by its electromagnetic force, whereby the brake shoe 1 and the brake drum 2 are connected. The gap between them is maintained and the brake drum 2 is opened. The braking force adjusting spring 5 is for adjusting the contact pressure between the brake shoe 1 and the brake drum 2, and is a safe deceleration that does not injure passengers when the brake release command is set to the off command during high speed operation. The mechanical braking force is adjusted by 5 adjustment springs so that it can be stopped.

In the brake device having such a brake structure, the brake release confirmation circuit as shown in FIG. 9 or FIG. 10 confirms the release of the brake and protects against an abnormal brake release. The protection logic when the brake is abnormal is omitted in FIGS. 9 and 10.

In FIG. 9, the brake release command is given by the brake release contactor 6, and when the brake release command is an on command, the brake release contactor 6 is turned on. When the brake release contactor is turned on, power is supplied to the brake coil 4 via the resistors 7a and 7b. The resistors 7a and 7b are brake limiting resistors, and limit the current flowing through the brake brake coil 4. A forcing control contactor 8 is provided on the resistor 7b. This is for shorting the resistor 7b to flow a large amount of brake current in order to shorten the brake suction time. That is, in order to shorten the brake suction time, it is necessary to quickly raise the magnetic flux in the brake coil. Therefore, the brake resistor 7b is short-circuited and a large amount of brake current is passed. Therefore, the forcing control contactor 8 is turned off again after the forcing time ends.

The brake release confirmation detection switch 9 is opened when the brake release command becomes an ON command and a current flows through the brake coil 4 to mechanically operate the brake shoe 1. Therefore, the brake release confirmation relay 10
When the brake release command is the off command, it is in the operating state, and when it is the on command, it is in the non-operating state. That is, when the OFF command is issued, the brake release confirmation relay 10 is excited and in an operating state, and at that time, the brake shoe 1 and the brake 2 drum are pressed.

When the brake release command is turned on, the brake shoe 1 is operated by the brake coil 4, the brake shoe 1 and the brake drum 2 are separated, and the brake release confirmation detection switch 9 is opened. The relay 10 is turned off. From this, when the brake release confirmation detection switch 9 is opened, the brake release confirmation relay 10 becomes inoperative, whereby it is detected that the brake device is in the open state.

In FIG. 9, when the brake release command is an ON command, the brake release confirmation detection switch 9 does not open and the brake release confirmation relay 10 continues to be excited to detect a brake abnormality.

Next, the brake release confirmation detection circuit shown in FIG. 10 is for performing the brake release confirmation when the brake release confirmation switch 9 is not directly constructed like the brake release confirmation detection circuit shown in FIG.

That is, the brake release confirmation relay 10 is turned on when the brake release contactor 6 is turned on. FIG.
In 0, when power is supplied to the brake coil 4 to confirm the brake operation, it is detected that the brake is in the open state.
A brake abnormality is detected when the brake release confirmation relay 10 is not turned on even though the brake release command is an on command.

As described above, the detection method of the brake release confirmation is carried out by confirming the operation of the brake shoe 1 or confirming the power supply to the brake coil 4 as shown in FIGS.

[0013]

However, there are the following problems in the conventional device as described above. That is, in the case of FIG. 9, it can be confirmed that the current flows through the brake coil 4 and the brake shoe 1 operates.
It cannot be monitored until it is confirmed whether the gap length between the brake shoe 1 and the brake drum 2 is maintained.

For example, when the suction of the brake shoe 1 is insufficient due to insufficient brake current due to poor adjustment of the gap or an increase in the resistance values of the brake resistors 7a and 7b, the vehicle may travel in a state in which the gap cannot be properly obtained. In such a case, the brake shoe 1 and the brake drum 2 may be damaged due to the friction between the brake shoe 1 and the brake drum 2 and need to be replaced. Also, brake shoe 1
When the frictional force between the brake drum 2 and the brake drum 2 is added to the actual required torque for driving the elevator, the torque becomes insufficient and the elevator suddenly stops during the acceleration operation, which gives passengers a feeling of discomfort and anxiety.

On the other hand, in the case of FIG. 10, only the fact that the power is supplied to the brake coil 4 is confirmed, so that the condition is further required as compared with the case of FIG. That is, in the case of FIG. 9, it is not possible to confirm whether or not the brake shoe 1 has been operated, so that the above-mentioned problem may occur further.

It is an object of the present invention to provide an elevator control device capable of determining a brake abnormality when the gap length between the brake shoe and the brake drum is not maintained during the brake release operation according to the brake release command. .

[0017]

According to a first aspect of the present invention, a brake state monitoring device for monitoring whether or not a gap is maintained between a brake shoe and a brake drum, and an on-command brake release command are output. After a lapse of a predetermined time after the operation, a brake abnormality detection circuit that outputs a brake abnormality signal when the brake state monitoring device detects that there is no gap between the brake shoe and the brake drum is provided.

According to the first aspect of the present invention, when the brake state monitoring device detects that the brake shoe and the brake drum are attracted in a contact state without a gap when the brake is released, the brake abnormality detection circuit detects a brake abnormality. judge. Then, based on the abnormal signal, the fact is displayed as necessary and the elevator is stopped.

According to a second aspect of the present invention, in the first aspect of the present invention, the brake condition monitoring device is attached to the brake shoe side electrode attached to each brake shoe of the pair of brake shoes and the circumference of the brake drum. When the brake shoe presses the brake drum, the brake drum side electrode that comes into contact with each brake shoe side electrode and the brake shoe side electrode and the brake drum side electrode operate when the brake shoe side electrode and the brake drum side electrode are in contact. The brake release confirmation relay for detecting that there is no gap and for detecting that there is a gap when the brake shoe side electrode and the brake drum side electrode are not in contact with each other. Elevator controller.

According to the second aspect of the present invention, in addition to the operation of the first aspect of the invention, when the brake release command is an on command, the brake release abnormality occurs when the brake release confirmation relay continues to operate. To detect.

According to a third aspect of the present invention, in the first aspect of the present invention, the brake condition monitoring device includes a brake shoe side electrode attached to each brake shoe of a pair of brake shoes and connected in parallel with each other, and a brake drum side electrode. It is mounted on the circumference and operates when the brake shoe side electrode and the brake shoe side electrode are in contact with the brake shoe side electrode that contacts the brake shoe side electrode when the brake shoe presses the brake drum. To detect that there is no gap, and when the brake shoe side electrode and the brake drum side electrode are not in contact, it becomes inoperative and detects a gap.The brake release confirmation relay and the motor speed are set to a specified low speed. Equipped with an operation prevention relay that stops the operation of the brake release confirmation relay when it exceeds the value Those were.

According to the third aspect of the invention, in addition to the operation of the first aspect of the invention, the brake release confirmation is made even though the brake release command is the on command and the speed of the electric motor is equal to or lower than the low speed set value. If the relay continues to operate, a brake release error is detected. Then, the operation blocking relay blocks the operation of the brake release confirmation relay when the speed of the electric motor exceeds a predetermined low speed set value. As a result, when one of the pair of brake shoes becomes non-contact, it is prevented that the brake is released.

According to a fourth aspect of the invention, in the third aspect of the invention, the predetermined low speed set value is a zero speed detection signal (3 m / min or less).

According to the invention of claim 4, in addition to the action of the invention of claim 3, the operation of the brake release confirmation relay is blocked when the speed of the electric motor exceeds the zero speed detection signal (3 m / min or less).

The invention of claim 5 is the invention of claim 2 or claim 3.
In the invention of claim 1, a strut for varying the length of the brake shoe side electrode so that the gap when the brake shoe and the brake drum are opened and the gap between the brake shoe side electrode and the brake drum side electrode are equal. Is provided.

According to the invention of claim 5, in addition to the operation of the invention of claim 2 or claim 3, the gap between the brake shoe side electrode and the brake drum side electrode is adjusted by the column.

The invention of claim 6 is the invention of claims 1 to 3.
In the invention of (1), the brake abnormality detection circuit has an abnormality detection relay that operates when the brake release command is an ON command and the brake release confirmation relay is operating, and a lapse of a predetermined time after the abnormality relay operates. And a timer that outputs a brake abnormality signal later.

According to the invention of claim 6, in addition to the operation of the invention of claims 1 to 3, the output signal of the abnormality detecting relay is
Prevent the malfunction by operating the timer only for the set time.

In the invention of claim 7, in the invention of claim 6, the predetermined time in the timer is set to be longer than the time from the output of the brake release command of the on command to the completion of the operation of the brake shoe. It is a thing.

In the seventh aspect of the invention, in addition to the operation of the sixth aspect of the invention, the timer is set at least as long as the time required for the mechanical opening operation of the brake shoe.

According to an eighth aspect of the invention, in the invention of the sixth aspect, the brake abnormality detecting circuit detects the brake shoe performing a mechanical opening operation by an ON command of a brake opening command instead of the timer. The release confirmation detection switch is provided so that the output of the brake abnormality signal is blocked until the brake release confirmation signal from the brake release confirmation detection switch is established.

According to the invention of claim 8, in addition to the operation of the invention of claim 6, the output of the output signal of the abnormality detecting relay is blocked until the mechanical opening operation of the brake shoe is completed, thereby preventing a malfunction.

According to a ninth aspect of the present invention, in the invention of the sixth aspect, the brake abnormality detection circuit operates when the brake release command is an off command and the brake release confirmation relay is inoperative. It is equipped with.

In the ninth aspect of the invention, in addition to the operation of the sixth aspect of the invention, the brake release confirmation relay for monitoring the contact between the brake shoe and the brake drum is turned off, even though the brake opening command is the off command. In this case, the free fall detection relay detects that it is a free fall. This prevents the car from moving and stops the elevator if necessary.

According to a tenth aspect of the present invention, in the brake abnormality detection circuit according to the sixth to ninth aspects, the brake release command becomes an off command when the speed of the electric motor exceeds a predetermined intermediate speed set value. And a brake slip detection relay that operates when the brake shoe is no longer in the mechanical opening state, and a counter that counts when the brake slip detection relay operates and outputs an output signal when the count value reaches the set value. And a wear detecting relay operated by the output signal of the counter.

According to the tenth aspect of the invention, in addition to the actions of the sixth to ninth aspects, the brake shoe side electrode and the brake drum side when the electric motor releases the brake at a high speed exceeding the intermediate speed set value. Wear with the electrodes is detected with a wear detection relay. Thereby, the replacement time information of the brake shoe side electrode and the drum side electrode is clearly indicated.

An eleventh aspect of the present invention is applied to the disc brake device according to any one of the first to tenth aspects, wherein the brake drum is a rotating portion of the disc brake device and the brake shoe is a stopping portion of the disc brake device. Is.

In the eleventh aspect of the present invention, even in a disc brake device having a different braking system, electrodes are provided respectively on the rotating portion and the stopping portion to detect a brake abnormality.

[0039]

Embodiments of the present invention will be described below. FIG. 1 is an explanatory diagram of a brake device showing a first embodiment of the present invention. In this first embodiment, FIG.
In contrast to the conventional example shown in (1), a brake state monitoring device is provided. This brake state monitoring device includes brake shoe side electrodes 11a and 11b attached to the brake shoes 1a and 1b of a pair of brake shoes 1, and a brake drum side electrode 12 attached to the circumference of the brake drum 2. A brake release confirmation relay 13 for confirming whether or not the brake is in the released state.

In FIG. 1, the brake drum side electrode 12
Is provided on the surface of the brake drum 2 that actually contacts the brake shoes 1a and 1b during braking operation. That is, the brake drum side electrode 12 is constructed by providing a groove on the entire circumference of the brake drum 2, insulating the inside of the groove once, and then attaching a conductor serving as an electrode to the insulator.

On the other hand, the brake shoe side electrodes 11a, 11
In the structure b, columns 14 made of an insulating material are erected on the brake shoes 1a and 1b, and the electrodes are fixed to the sides opposite to the brake shoes 1a and 1b. As for the mounting positions of the brake shoe side electrodes 11a and 11b, the brake opening command is an off command and the brake shoes 1a and 1b are attached.
When the brake drum 2 and the brake drum 2 are pressed, the brake drum side electrode 12 and the brake shoe side electrode 11a,
When the brake release command is an ON command and the brake shoes 1a and 1b are attracted, the brake drum side electrode 12 and the brake shoe side electrodes 11a and 11b are It is installed at a position where a set gap is secured and separated.

This mounting position is adjusted by the column 14. That is, the support shoe 14 allows the brake shoe 1 to
a, 1b and the gap when the brake drum 2 is opened and the gap between the brake shoe side electrodes 11a and 11b and the brake drum side electrode 12 are equal to each other.
The length of the brake shoe side electrodes 11a and 11b is variable. In FIG. 1, the brake shoe side electrodes 11a, 1
Two brake shoes 1a are attached to each of the brake shoes 1a and 11b. And the same brake shoe 1a
The brake shoe side electrodes 11a (11b) attached to (1b) are connected by electric wires and are connected in parallel.

The brake release confirmation relay 13 operates when the brake shoes 1a, 1b and the brake drum 2 are pressed and are in contact with each other. That is, when the brake shoe side electrodes 11a and 11b and the drum side electrode 12 are in contact with each other, they are excited and operate.
That is, the brake release confirmation relay 13 operates when the brake shoe side electrodes 11a and 11b are in contact with the brake drum side electrode 12 to detect that there is no gap, and at the same time to detect the brake shoe side electrodes 11a and 11b. When the brake drum side electrode 12 is not in contact with the brake drum side electrode 12, the operation is not performed and it is detected that there is a gap.

Next, the brake abnormality detection circuit will be described. FIG. 2 is a circuit diagram of the brake abnormality detection circuit according to the first embodiment. In FIG. 2, the contacts 15b are the brake shoe side electrode 11 and the brake drum side electrode 12.
The contact b is closed when the contact is made and is opened when the contact is not made, the contact 13a is an a contact that is closed when the brake release confirmation relay 13 is excited, and 16a is a brake release command relay (not shown) outputs an on command. Closed when a
It is a contact point.

The brake abnormality detecting relay 17 is for detecting an abnormality of the brake, and has a contact 16a which is closed when the brake opening / closing command signal is an ON command and a contact 13a of the brake release confirming relay 13. Both are closed, and a brake abnormality signal is output after the set time set by the timer 18 has elapsed.

That is, after the brake release command is output and the contact 16a is closed, if the brake shoe 1 cannot be completely sucked and the brake shoe 1 and the brake drum 2 are in contact with each other, the brake release confirmation relay 13 Continues to be excited. Therefore, Ontray timer 1
When the set time set in 8 has elapsed, the brake abnormality detection relay 17 outputs a brake abnormality signal. Here, the predetermined set time in the timer 18 is longer than the time from the output of the brake release command of the on command to the completion of the operation of the brake shoe 1. This prevents malfunction of the brake abnormality detection circuit.

Now, assume that the elevator is stopped and the brake release command is not output. At this time, since the brake shoe 1 and the brake drum 2 are pressed and are in contact with each other, the brake shoe side electrode 11 and the brake drum side electrode 12 are also in contact with each other. Therefore, the following circuit is formed. That is, a loop of the control power source Vcc, the brake shoe side electrode 11a, the brake drum side electrode 12, the opposite brake shoe side electrode 11b, the brake release confirmation relay 13, and the zero potential 0v is formed. This allows
Power is supplied from the control power supply Vcc to the brake release confirmation relay 13, and the brake release confirmation relay 13 is excited and is in an operating state, so that its contact 13a is closed. In this state, the brake release command is an off command, so the contact 16a is open.

In this state, when the brake release command becomes the ON command, the contact 13a remains closed, so that the on-delay timer 18 starts operating. However, when the brake shoe is completely sucked, the electrode 11 on the brake shoe side 11
Since the drum side electrode 12 is separated from the drum side electrode 12 and the contact 15b is opened, the brake release confirmation relay 13 is turned off and becomes inoperative. Therefore, the brake abnormality detection circuit does not output the brake abnormality signal. This causes the elevator to continue normal operation.

If the suction of the brake shoe 1 is not complete and the brake shoe side electrode 11 and the brake drum side electrode 12 remain in contact with each other, the contact points 16a and 13a remain established. Therefore, the on-delay timer 18 continues to operate, and after the set time, the brake abnormality signal is output from the brake abnormality detection relay 17. In this case, the abnormality signal is output and the operation of the elevator is stopped as needed.

As described above, according to the first embodiment, when the suction of the brake shoe 1 is not perfect and the brake shoe 1 and the brake drum 2 are still in contact with each other, it is actually Since it is possible to reliably detect the brake abnormality before the elevator starts moving, it is possible to prevent the passenger from feeling uneasy due to the damage caused by the friction between the brake shoe 1 and the brake drum 2 or the sudden stop during high-speed operation.

Next, a second embodiment of the present invention will be described. FIG. 3 is an explanatory diagram of a brake device according to the second embodiment of the present invention. In the first embodiment shown in FIG. 1, when one of the pair of brake shoes 1a and 1b is in non-contact and the other is in contact, the control power supply Vcc and the brake shoe side electrode 11a are provided. , Brake drum side electrode 12, opposite brake shoe side electrode 11b, brake release confirmation relay 13, zero potential 0
Since the loop of v is not formed, the brake abnormality signal is not output.

In the second embodiment, the brake abnormality signal can be output even in such a case. That is, in contrast to the first embodiment shown in FIG.
The brake shoe side electrodes 11a and 11b are attached to the pair of brake shoes 1a and 1b, respectively, and the control power source V
cc are connected in parallel with each other. Further, an operation preventing relay 19 is provided, and its contact 19a is provided so as to open and close with respect to the brake drum side electrode 12. Other configurations are the same as those of the first embodiment shown in FIG. 1, and therefore, the same components are denoted by the same reference symbols and description thereof will be omitted.

In FIG. 3, the operation blocking relay 19 blocks the operation of the brake release confirmation relay 13 when the speed of the electric motor exceeds a predetermined low speed set value.
The contact 19a is a limit switch contact that comes into contact with the brake drum side electrode 12 when the operation prevention relay 19 is excited and separates from the brake drum side electrode 12 when the excitation is stopped. The contact 19a is constructed so as to satisfy the operation condition of the brake release confirmation relay 13.

FIG. 4 is a circuit diagram of a brake abnormality detection circuit according to the second embodiment. A contact 20b is a b contact of a low speed detection relay, and the contact 20b is a low speed detector whose motor speed is low. When it is less than the low speed set value of, it is closed, and when it exceeds the low speed set value, it is opened. Also,
The contacts 15b1 and 15b2 are used for the brake shoe side electrode 11
Since a and 11b are connected in parallel to each other with respect to the control power supply Vcc, they are connected in parallel, and the contact 15
b1 is a b contact which is closed when the brake shoe side electrode 11a and the brake drum side electrode 12 are in contact with each other and which is opened when the brake shoe side electrode 11a is not in contact, and a contact point 15b2 is a contact point between the brake shoe side electrode 11b and the brake drum side electrode 12 It is a b contact that is sometimes closed and opens when not in contact.

The contact 13a is an a contact that is closed when the brake release confirmation relay 13 is excited, and 16a is an a contact that is closed when a brake release command relay (not shown) outputs an on command.

It is assumed that the elevator is stopped now.
At this time, the brake shoe 1 and the brake drum 2 are pressed, and the contacts 15b1 and 15b2 are both closed,
Further, since the speed of the electric motor is zero, the contact 20b is closed. Therefore, the operation preventing relay 19 is in the operating state and its contact 19a is closed. That is, contact 1
9a is in contact with the brake drum side electrode 12. As a result, in this state, the following circuit is formed. Control power supply Vcc, brake shoe side electrode 11a,
A brake drum side electrode 12, a contact 19a, a brake release confirmation relay 13, and a loop of zero potential 0V are formed. As a result, the brake release confirmation relay 13 is excited.

In this state, when the brake release command becomes the ON command, the contact 13a remains closed as in the first embodiment, so that the on-delay timer 18 starts operating. However, when the brake shoes 1a, 1b are completely sucked, the brake shoe side electrodes 11a, 11b are separated from the drum side electrode 12 and the contacts 15b1, 15b2 are opened, so that the brake release confirmation relay 13 is turned off and becomes inoperative. Therefore, the brake abnormality detection circuit does not output the brake abnormality signal. This causes the elevator to continue normal operation.

Then, the speed of the elevator increases,
When the low speed set value is exceeded, the operation prevention relay 19 operates and opens the contact 19a, so that the brake release confirmation relay 13 is turned off and the subsequent brake abnormality detection operation is stopped.

On the other hand, the suction of one of the brake shoes 1a, 1b is not perfect and the brake shoe side electrodes 11a, 1b
If any of the electrodes 1b and the brake drum side electrode 12 are kept in contact with each other, the contacts 15b1 and 15b2
And are connected in parallel, the brake release confirmation relay 13 is in the operating state and the contact 13a is closed.

From this, the contact 16a and the contact 13a
Since the above are still established, the on-delay timer 18 continues to operate, and after the set time, the brake abnormality signal is output from the brake abnormality detection relay 17. In this case, the abnormality signal is output and the operation of the elevator is stopped as needed. In this way, even if only one side of the brake shoes 1a, 1b becomes inadequately suctioned and comes into contact with the brake shoes 1a, 1b, it is also detected as a brake abnormality.

Further, the reason why the excitation of the brake release confirmation relay 13 is stopped and the brake abnormality detection operation is stopped when the low speed is detected is to protect the contact 19a of the operation preventing relay 19. That is, in the high speed operation state of the electric motor,
If the contact 19a of the operation prevention relay 19 is in contact with the electrode 12 on the brake drum side, the contact portion will be worn out and must be replaced immediately. Therefore, the brake abnormality detection should be stopped above the low speed set value. ing. The predetermined low speed set value is a zero speed detection signal (3 m / min or less), and the operation of the brake release confirmation relay 13 is performed when the speed of the motor exceeds the zero speed detection signal (3 m / min or less). Block.

As described above, according to the second embodiment, the brake abnormality can be detected even when only one side or a part of the brake shoe 1 is pressed and in contact with the brake drum 2. For example, if only one of the plurality of brake shoe side electrodes 11a provided on the brake shoe 1a is in contact, the brake abnormality can be detected. As a result, the brake shoe 1 and the brake drum 2
The detection accuracy of contact with can be improved significantly.

Next, a third embodiment of the present invention will be described. FIG. 5 shows a circuit diagram of an abnormality detection circuit according to the third embodiment of the present invention. This third embodiment is shown in FIG.
In the brake abnormality detection circuit according to the second embodiment shown in FIG. 7, a brake release confirmation detection switch for detecting that the brake shoe 1 has performed a mechanical release operation by an ON command of a brake release command instead of the timer 18. Until the brake release confirmation signal from 9 is established, the output of the brake abnormality signal is blocked. This prevents malfunction of the brake abnormality detection circuit.

In FIG. 5, the brake release command is given by the brake release contactor 6, and the brake release contactor 6 is turned on when the brake release command is an on command. When the brake release contactor is turned on, power is supplied to the brake coil 4 via the resistors 7a and 7b. The resistors 7a and 7b are brake limiting resistors, and limit the current flowing through the brake brake coil 4. A forcing control contactor 8 is provided on the resistor 7b. This is for shorting the resistor 7b to flow a large amount of brake current in order to shorten the brake suction time. That is, in order to shorten the brake suction time, it is necessary to quickly raise the magnetic flux in the brake coil. Therefore, the brake resistor 7b is short-circuited and a large amount of brake current is passed. Therefore, the forcing control contactor 8 is turned off again after the forcing time ends.

The brake release confirmation detection switch 9 is opened when the brake release command becomes an ON command and a current flows through the brake coil 4 to mechanically operate the brake shoe 1. Therefore, the brake release confirmation relay 10
When the brake release command is the off command, it is in the operating state, and when it is the on command, it is in the non-operating state. That is, when the OFF command is issued, the brake release confirmation relay 10 is excited and in an operating state, and at that time, the brake shoe 1 and the brake 2 drum are pressed.

When the brake release command is turned on, the brake shoe 4 is operated by the brake coil 4, the brake shoe 1 and the brake drum 2 are separated, and the brake release confirmation detection switch 9 is opened. The relay 10 is turned off. From this, when the brake release confirmation detection switch 9 is opened, the brake release confirmation relay 10 becomes inoperative, whereby it is detected that the brake device is in the open state.

In the third embodiment, the b contact 10b opened when the brake release confirmation relay 10 operates.
Is included in the operating conditions of the brake abnormality detection relay 17. Therefore, the brake release confirmation relay 10 continues to be excited until the brake release command is turned on and the brake shoe 1 mechanically operates and the brake release confirmation detection switch 9 is opened. The state is maintained and the operation of the brake abnormality detection relay 17 is blocked. After the brake shoe 1 mechanically operates, the brake release confirmation relay 10 becomes inoperative, so
The contact 10b is closed to enable detection of a brake abnormality.

As described above, in the third embodiment,
Instead of the timer 18, the b contact 1 of the brake release confirmation detection switch 9 for detecting that the brake shoe 1 has performed the mechanical release operation by the ON command of the brake release command.
Since the signal 0b is used, the on-delay timer is used to start the brake abnormality detection, and the detection start time is set by estimating the operation time of the brake shoe. Therefore, it is possible to prevent the malfunction of the brake abnormality detection circuit due to the error or the error in the set time of the timer 18, and the malfunction of the brake abnormality detection circuit due to the error in the low speed detection timing.

FIG. 6 is a circuit diagram of the free fall detection circuit. It is also possible to incorporate this free fall detection circuit into each of the brake abnormality detection circuits shown in the above-described first to third embodiments.

In FIG. 6, the contact point 16b is the b contact point of the brake release command relay (not shown), and the contact point 13b is the b contact point of the brake release confirmation relay 13. The free-fall detection relay 21 detects that the brake release confirmation relay 13 is inoperative and the brake is in the open state even though the brake release command is the OFF command.

Now, when the elevator is stopped and the brake release command is the off command, the contact 16b is closed. If the brake is normal, the brake shoe 1 and the brake drum 2 are pressed and brought into contact with each other, so that the brake release confirmation relay 13 is excited. Therefore, the b contact 13b is open, and the free fall detection relay 21 is not excited.

However, if power is supplied to the brake coil 4 due to some brake abnormality and the brake shoe 1 is attracted, the brake release confirmation relay 13 becomes inoperative,
The b contact 13b is closed, and the brake abnormality detection relay 21
Is excited.

By using the brake abnormality detection circuit incorporating the free fall detection circuit as described above, even if the suction state of the brake shoe 1 is normal, the brake release command is not issued due to some abnormality in the brake circuit. Nevertheless, the brake shoe 1 is sucked and the brake drum 2
It can detect that is opened. Therefore, by the operation of the free fall detection relay 21, it becomes possible to cut off the power supply to the brake circuit before the car actually starts to move due to the free fall. As a result, the brake drum 2 is pressed again by the brake shoe 1 to prevent the elevator from starting to move, which is effective from a safety standpoint.

Next, FIG. 7 is a circuit diagram of the electrode wear detection circuit. It is also possible to incorporate this electrode wear detection circuit into each of the brake abnormality detection circuits shown in the above-described first to third embodiments.

In FIG. 7, a contact 22a is an a contact of an intermediate speed detection relay (not shown), a contact 16b is a b contact of a brake release command relay (not shown), and a contact 10a is an a contact of the brake release confirmation relay 10. The brake slip detection relay 23 detects that the brake device is in the brake open state in a high speed operation state where the speed of the electric motor is an intermediate speed or higher, and the contact 23a is the a contact.

The counter 24 counts the operating time of the brake slip detection relay 23. When the count value of the counter 24 exceeds a predetermined set value, a
It operates to close the contact 24a. The wear detecting relay 25 is a relay that is excited when the count value of the counter 24 exceeds a set value and the contact 24a is closed, and detects wear of the brake shoe 1 and the brake drum side electrode 12. . By the operation of the wear detecting relay 25, the maintenance staff will check the replacement of the brake contacts (each electrode and the contact 19a).

Now, when the elevator is started and the speed of the electric motor becomes higher than the intermediate speed, the contact 22a of the intermediate speed detection relay is closed, but the brake release command continues the ON command while the elevator is in operation. Therefore, the point 16b of the brake release command relay (not shown) is open, and the brake release confirmation detection relay 10 is not operating, so its a contact 10a is open. Therefore, the brake slip relay 23 is not excited and the counter 24 is not counted.

However, due to some reason (for example, the operation of the protection circuit), the brake opening command becomes an OFF command during high speed operation of the elevator, or the brake opening command is an ON command, but due to an abnormality in the brake device or the like. When the suction of the brake shoe 1 is stopped, the contact 16b or the contact 10a is closed. As a result, the brake slip detection relay 23 is excited. Therefore, the counter 24 operates to count. When the count value exceeds the set value, the wear detecting relay 25 is excited to notify the wear of the electrode and prompt the replacement.

As described above, by using the brake abnormality detection circuit incorporating the electrode wear detection circuit, there is no problem in detecting the brake abnormality during the stop, and the brake release command during the high speed operation can be issued even if the brake abnormality is not generated. It is possible to understand the wear condition of the electrodes that occurs when the brake slip occurs, such as when an off command is issued. Therefore, the replacement time of the electrodes can be clearly displayed if necessary. That is, contact failure due to electrode wear can be prevented, and the accuracy of the brake abnormality detection circuit can be further improved.

In the above description, only the slip of which the speed of the electric motor is the intermediate speed or higher is detected, but the slip of the low speed or higher may be detected.

Further, in the above description, the drum type electromagnetic brake device having the brake shoe 1 and the brake drum 2 has been described, but in the case of a disc brake having a different brake structure, the brake drum is used as a rotating part of the disc brake device. It is also possible to apply the brake shoe to the disc brake device as a stopping part of the disc brake device.

[0082]

As described above, according to the present invention, when the brake shoe suction operation is performed when the brake release command is the ON command due to insufficient suction of the brake shoe or poor adjustment, the gap between the brake shoe and the brake drum is reduced. Since the monitoring is performed, even if the ON command is output as the brake release command and the elevator is about to start moving, the elevator can be immediately stopped when the contact due to the insufficient gap between the brake shoe and the brake drum occurs.

Further, it is possible to prevent damage due to friction between the brake shoe and the brake drum and anxiety caused by a sudden stop during high-speed operation, and to provide a safe and highly reliable elevator brake device.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a brake device according to a first embodiment of the present invention.

FIG. 2 is a circuit diagram of a brake abnormality detection circuit according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a brake device according to a second embodiment of the present invention.

FIG. 4 is a circuit diagram of a brake abnormality detection circuit according to a second embodiment of the present invention.

FIG. 5 is a circuit diagram of an abnormality detection circuit according to a third embodiment of the present invention.

FIG. 6 is a circuit diagram of a free fall detection circuit incorporated in the brake abnormality detection circuit according to the present invention.

FIG. 7 is a circuit diagram of an electrode wear detection circuit incorporated in the brake abnormality detection circuit according to the present invention.

FIG. 8 is an explanatory diagram of a conventional brake device.

FIG. 9 is a circuit diagram showing an example of a conventional brake release confirmation detection circuit.

FIG. 10 is a circuit diagram showing another example of a conventional brake release confirmation detection circuit.

[Explanation of symbols]

 1 Brake Shoe 2 Brake Drum 3 Rotating Shaft 4 Brake Coil 5 Braking Force Adjusting Spring 6 Brake Release Contactor 7 Resistance 8 Forcing Control Contactor 9 Brake Release Confirmation Detection Switch 10 Brake Release Confirmation Relay 11 Brake Shoe Side Electrode 12 Brake Drum Side Electrode 13 Brake Release Confirmation Relay 14 Strut 15b Electrode Contact Contact 16a Brake Release Command Contact 17 Brake Abnormality Detection Relay 18 Timer 19 Operation Blocking Relay 20b Low Speed Detection Contact 21 Free Fall Detection Relay 22a Intermediate Speed Detection Contact 23 Brake Slip Detection Relay 24 Counter 25 Wear detection relay

Claims (11)

[Claims] 1. A drum-type electromagnetic brake device comprising a brake drum that is directly connected to an electric motor that raises and lowers an elevator car and that rotates with the rotation of the electric motor, and a pair of brake shoes that actuate the brake by pressing the brake drum from both sides. On the other hand, when the brake release command is an on command, the brake shoe is separated from the brake drum to open the brake drum, and when the brake release command is an off command, the brake shoe presses the brake drum. In an elevator control device configured to prevent rotation of the brake drum, a brake state monitoring device that monitors whether or not a gap is maintained between the brake shoe and the brake drum, and the on-command brake At a predetermined time after the release command is output An elevator control device comprising: a brake abnormality detection circuit that outputs a brake abnormality signal when the brake state monitoring device detects that there is no gap between the brake shoe and the brake drum after a lapse of time. . 2. The brake condition monitoring device includes a brake shoe-side electrode attached to each brake shoe of the pair of brake shoes, and the brake shoe attached on the circumference of the brake drum so that the brake shoe covers the brake drum. The brake drum-side electrode that contacts each of the brake shoe-side electrodes when pressed and the brake shoe-side electrode that operates when the brake drum-side electrode and the brake drum-side electrode are in contact with each other are The brake release confirming relay, which detects the presence of the gap and is inoperative when the brake shoe side electrode and the brake drum side electrode are not in contact with each other. Elevator controller. 3. The brake condition monitoring device includes a brake shoe side electrode attached to each brake shoe of the pair of brake shoes and connected in parallel with each other, and the brake shoe attached on the circumference of the brake drum. When the brake drum is pressed, the brake drum side electrode that comes into contact with the brake shoe side electrode and the brake shoe side electrode and the brake drum side electrode operate when the gap is in operation. When the brake shoe side electrode and the brake drum side electrode are in non-contact with each other, the brake release confirmation relay detects the absence of the gap and the presence of the gap, and the speed of the electric motor is a predetermined low speed. When the set value is exceeded, the operation of the brake release confirmation relay is blocked. The elevator control apparatus according to claim 1, further comprising a relay. 4. The predetermined low speed set value is a zero speed detection signal (3 m / min or less).
3. The elevator control device according to claim 1. 5. The length of the brake shoe side electrode is set so that the gap when the brake shoe and the brake drum are opened and the gap between the brake shoe side electrode and the brake drum side electrode are equal. The elevator control apparatus according to claim 2 or 3, characterized in that a supporting column for making the variable is provided. 6. The brake abnormality detection circuit includes an abnormality detection relay that operates when the brake release command is an ON command and the brake release confirmation relay is operating, and after the abnormality relay operates. The elevator control apparatus according to claim 1, further comprising a timer that outputs the brake abnormality signal after a predetermined time has elapsed. 7. The predetermined time period of the timer is longer than the time period from the output of the brake opening command of the on command to the completion of the operation of the brake shoe. Elevator control device as described. 8. The brake abnormality detection circuit is provided with a brake release confirmation detection switch for detecting that the brake shoe has performed a mechanical release operation in response to an ON command of the brake release command, instead of a timer. 7. The elevator control device according to claim 6, wherein the output of the brake abnormality signal is blocked until the brake release confirmation signal from the release confirmation detection switch is established. 9. The brake abnormality detection circuit comprises a free fall detection relay that operates when the brake release command is an OFF command and the brake release confirmation relay is inoperative. The elevator control device according to item 6. 10. The brake abnormality detection circuit is configured such that, when the brake release command is an off command when the speed of the electric motor exceeds a predetermined intermediate speed set value, or when the brake shoe is in a mechanical release operation state. Brake slip detection relay that operates when it disappears, a counter that counts when the brake slip detection relay operates and outputs an output signal when the count value reaches a set value, and wear that operates according to the output signal of the counter The elevator control device according to claim 6, further comprising a detection relay. 11. The disc brake device according to claim 1, wherein the brake drum is a rotating part of the disc brake device, and the brake shoe is a stopping part of the disc brake device. Elevator control device.