KR100295879B1 - Method for controlling brake of elevator and detection apparatus thereof - Google Patents

Abstract

The present invention relates to a brake control device of the elevator and a detection method thereof. In the related art, when the braking force of the brake is lost and the emergency stop is not performed, there is a problem in that passenger safety cannot be secured. Accordingly, the present invention provides an elevator having an elevator drive motor, a cage driven up and down by the motor, a brake device for stopping the elevator drive system, the brake abnormality detecting unit detecting that the braking force of the brake device is lost; An actuator that operates when the brake device loses braking force, an emergency speed command generation unit that outputs an emergency speed command when the brake abnormality detection unit detects that the brake braking force is lost, and the motor by an emergency speed command outputted above. Emergency torque control to control and auxiliary brake means when the actuator is operated, even if the mechanical braking force of the brake is lost by forcibly driving the elevator to the door opening position by the torque control of the electric motor after the auxiliary brake By continuously braking the elevator by means, it is possible to completely prevent the elevator from falling freely in the direction of rising or falling, so as to enhance the safety of the passengers and stop the elevator completely by stopping the elevator completely by controlling the electric motor. By using this method, no damage to equipment such as hoisting ropes or hoistway rails occurs.

Description

Brake control device of elevator and its detection method {METHOD FOR CONTROLLING BRAKE OF ELEVATOR AND DETECTION APPARATUS THEREOF}

The present invention relates to an elevator brake control device for detecting the elevator mechanically and a method for detecting the elevator, and in particular, when the brake device of the hoisting machine installed in the elevator machine room to drive the elevator loses or weakens its braking force, the elevator moves upward or downward. An elevator brake control apparatus for preventing a collision accident and a detection method thereof.

The drive system of the elevator is generally in the form of elevating the cage and the balance weight suspended in a rim shape to the sheave coupled to the motor shaft.

Therefore, the unbalanced torque due to the weight difference between the cage and the counterweight is acting on the sheave, and a high safety is required for the brake device that stops it when the elevator stops.

Problems of the elevator brake device that requires such a high safety are as follows.

That is, while driving the elevator, current flows to the coil for operating the brake device, and the driving force is insufficient due to some reason, and the brake drum and the lining are in contact with each other, and the wear of the lining deepens and stops at a predetermined position. It can't be done, which will cause human accidents.

An effective way to solve this problem is to use a rope brake device which is a device for holding a rope wound on the sheave and hoisting the elevator.

Another technique is Korean Patent Publication No. 97-6580.

This invention describes a technique relating to abnormality detecting means for detecting that the rotating body of the brake device and the holding portion are in half contact, and a method of detecting that a predetermined force is applied to the holding portion in a state where the cage is moving. It is used.

However, in the prior art as described above, the technique of Korean Patent Publication No. 97-6580 detects that the rotating body and the holding portion of the brake device are in contact with each other to emergencyly stop the elevator. If not, there is a problem that does not ensure the safety of the passengers.

Therefore, an object of the present invention for solving the conventional problems as described above is to separate the auxiliary brake means after evacuating the cage safely to a predetermined position even if the brake device is weakened or the braking force is lost by any cause It is to provide an elevator brake control device and a method of detecting the same so that the cage can be kept stationary.

Another object of the present invention is to provide an elevator brake control device and a detection method thereof for preventing an accident in which the elevator collides to the upper or lower side when the brake device loses or weakens the braking force.

Still another object of the present invention is to provide an elevator brake control apparatus and a method of detecting the same, which completely stops the elevator by controlling the electric motor and prevents the elevator from moving, thereby preventing any equipment damage such as hoisting ropes or hoistway rails. In providing.

1 is a block diagram of a brake control apparatus of the present invention elevator,

2 is a flowchart illustrating a brake detection method of an elevator of the present invention.

3 is a flowchart illustrating an operation of an elevator control method when a brake is detected in FIG. 2;

*** Explanation of symbols for main parts of drawing ***

1: Operation control unit 2: Brake error detection unit

3: Speed command generator in emergency 4: Speed command generator in normal

5: Emergency Torque Control Unit 6: Normal Torque Control Unit

7: motor 8: signal generator

9: Stopper Coupling 10: Actuator

11 deceleration device 12 brake device

13: brake drum 14: sheave

15: cage 16: counterweight

17: rope 18: shaft

The present invention for achieving the above object is a cage driven by the elevator drive motor, the sheave for changing the rotational movement of the motor to the linear movement of the cage through a rope wound directly connected to the motor shaft, and the cage and the balance A brake device for stopping an elevator drive system such as a weight, a deceleration device for slowing down the movement speed of the cage, an actuator operating when the brake device loses braking force, and controlling the elevator operation collectively by the actuator. An operation control unit, a brake abnormality detection unit for detecting that the braking force of the brake device is lost, an emergency speed command generation unit for outputting an emergency speed command when it is detected that the brake braking force is lost in the brake abnormality detection unit, and an emergency output from the above speed The emergency torque control unit for controlling the motor by the command, the normal speed command generation unit for outputting the normal speed command when the brake abnormality detection unit detects that there is no abnormality, and the normal speed command outputted above. It characterized in that it consists of a normal torque control unit for controlling the electric motor by, and a stopper coupling acting as an auxiliary brake when the actuator is operated.

The present invention also provides a first step of generating a brake command to stop the elevator at a predetermined position, a second step of checking whether the elevator is completely stopped by the brake command generated above, and if the elevator stops, If the elevator does not stop, the third step of checking whether the brake command is abnormal, and if the brake command is judged to be abnormal or there is no abnormality and the time required for the brake to operate has passed, the brake braking force is lost. And a fifth step of setting a signal indicating that a signal is generated, and a fifth step of operating the auxiliary brake means when the signal is input to stop the elevator on the lower floor in a low speed operation, and then resetting the brake braking force loss signal so as not to restart. As a feature do.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a configuration diagram of a brake control apparatus of an elevator of the present invention, as shown in this, through a cage 15 driven up and down by an elevator drive motor, and a rope wound directly connected to the motor shaft 18 Sheave 14 for changing the rotational motion of the electric motor 7 to the linear motion of the cage 15, and the brake device 12 for stopping the elevator drive system such as the cage 15 and the counterweight 16, and In addition, the deceleration device 11 for decelerating the movement speed of the cage 15, the actuator 10 which operates when the brake device 12 loses the braking force, and the actuator 10 collectively operates the elevator. The brake control unit 1 to control, the brake abnormality detecting unit 2 for detecting that the braking force of the brake device 12 is lost, and the brake abnormality detecting unit 2 detect that the brake braking force is lost. The emergency speed command generation unit 3 for outputting an emergency speed command, an emergency torque control unit 5 for controlling the electric motor 7 by the emergency speed command outputted above, and the brake abnormality detection unit 2 Normal speed command generation unit 4 which outputs normal speed command when detecting that the brake device has no abnormality, and normal torque control unit 6 which controls motor 7 by normal speed command output above. ), A stopper coupling 9 acting as an auxiliary brake when the actuator 10 operates, and a signal for providing the brake abnormality detecting unit 2 with a pulse signal proportional to the rotational speed of the electric motor 7. It consists of the generator (8).

2 is an operation flowchart of the brake detection method of the elevator of the present invention, as shown in the first step (S21) of generating a brake command to stop the elevator at a predetermined position, and the brake command generated above. The second step (S22) of checking whether the elevator is completely stopped by the above step; and the third step (S23) of checking whether the brake command is normal when the elevator stops (S26). ) And a fourth step (S25) of setting a signal indicating that the brake braking force is lost when sufficient time required for the brake to be operated (S24) is judged that there is an abnormality in the brake command or there is no abnormality. When the elevator stops on the near floor by low speed operation A fifth step (S27, S28) to reset the brake braking force loss signal after turning on so as not to restart.

FIG. 3 is an operation flowchart of an elevator control method when detecting a brake in FIG. 2. As shown in FIG. 2, when a brake braking force loss is detected as an output signal of an electric motor, a first step S32 of checking whether a brake is broken and If there is no brake failure as described above, if it is determined that the brake is broken, the second step (S33) of judging whether the elevator is running or stopped, and if the elevator is running, stops immediately at a low floor and stops the braking operation. Third step (S34) to be continued and the fourth step (S35) to evacuate the passenger by opening and closing the door when the elevator is stopped in the second step (S33) or stopped on the floor close to the third step (S34) After evacuating the passenger from above, operate the auxiliary brake means to mechanically fix the elevator and cut off the electric current of the motor. A ring made of a fifth step (S36-S38) indicate a failure.

Referring to the operation and effect of the present invention configured as described in detail as follows.

In FIG. 1, the elevator cage 15 and the counterweight 16 are connected by a rope 17 and suspended in a foil shape relative to the sheave 14.

The sheave 14 is coupled to the electric motor 7 via the brake drum 13 and the speed reduction device 11 by the electric motor shaft 18.

On the motor shaft 18, a stopper coupling 9 which is an auxiliary brake means and an actuator 10 which is engaged with the stopper coupling 9 are operated when the main brake device 12 loses the braking force. do.

As shown in FIG. 2, the operation control unit 1 generates a brake command to the brake device 12 to stop the elevator at a predetermined position. (S21)

Then, the brake device 12 stops the elevator cage 15 by using the brake drum 13 and the deceleration device 11, and thus the electric motor 7 coupled to the electric motor shaft 18 connected to the sheave 14. Will not run.

When the cage 15 is moved, the sheave 14 is rotated, and the electric motor 7 is also rotated by the motor shaft 18, where the signal generator 8 is a pulse proportional to the number of revolutions of the electric motor 7. A signal is generated to the brake abnormality detecting unit 2.

When the cage 15 is stopped, the signal generator 8 does not generate a pulse signal to the brake abnormality detector 2.

At this time, the brake abnormality detecting unit 2 determines that the elevator has not stopped when the pulse signal is input from the signal generator 8, and determines that the elevator has stopped when the pulse signal is not received, and informs the operation controller 1. .

Then, the driving control unit 1 determines whether the elevator is completely stopped or not by the signal provided by the brake abnormality detecting unit 2 (S22).

If it is determined that the elevator is stopped, it is determined that the elevator is in a normal state (S26). If it is determined that the elevator is not stopped, it is first checked whether or not the brake command is abnormal.

This is to confirm whether the braking force is lost due to a defect of the brake itself or whether the signal system is abnormal.

As a device for driving the brake device 12, a magnetic contactor is usually used. A case in which the contactor of the contactor is welded or the mover is locked during the opening and closing operation is reported.

In this case, a method of emergency stop of the elevator by blocking the elevator supply power is also considered, but the detailed description in the present invention will be omitted.

If there is an abnormality in the brake command in step S23 or after the brake command is applied, but the elevator continues to move despite sufficient time required for the brake to be operated (S24), it is determined that the braking force of the brake is immediately lost.

Accordingly, the driving control unit 1 generates a signal informing the speed command generation unit 3 of the emergency that the braking force of the brake is lost.

Accordingly, the emergency speed command generation unit 3 controls the driving of the electric motor 7 through the emergency torque control unit 5.

When the elevator is in normal operation, the driving controller 1 generates a driving signal to the speed command generator 4 when it is normal, and controls the motor 7 to be driven normally through the torque controller 6 when it is normal. .

When the brake braking force is lost, the torque control unit 5 operates the electric motor 7 at a low speed to stop the nearest floor.

Then, the operation control unit 1 stops the cage 15 of the elevator to the nearest floor by the low speed operation and continues to operate the stopper coupling 9, which is an auxiliary brake means.

This is because the elevator is automatically restarted when it stops after performing the brake operation.

After the brake check or troubleshooting is completed by an expert, the brake braking force loss signal is reset only by pressing the manual reset device mounted on the stopper coupling (S27, S28).

As described above, the state check signal for the loss of the brake braking force of the brake abnormality detecting unit 2 is executed at a predetermined period (usually 100 msec).

The process of detecting whether the braking force of the brake is lost in the same manner as described above and controlling the elevator when the braking force of the brake is lost will be described with reference to FIG. 3.

According to the output in step S31 of Fig. 3, it is detected whether the brake is broken (S32). If there is no brake failure, the process is terminated. If the brake is broken, it is first determined whether the elevator is running or stopped. (S33)

As a result of the determination, if the elevator is running, it is immediately decelerated to stop at the nearest floor where the elevator can stop at a low speed.

Then, even if the elevator stops at a predetermined position, the electric current continues to flow to the electric motor 7 to continue the elevator braking operation by the electric motor 7 (S34).

In this way, after stopping at the nearest floor, the door is opened and closed to evacuate passengers first. (S35)

Prior to evacuating the passenger, the actuator 10 is operated to engage the movable stopper coupling 9 attached to the actuator 10 with a stationary coupling coupled to the motor shaft 18. (S36)

It is preferable that the actuator 10 generally uses a solenoid device, and the stopper coupling 9 is suitably made of steel having a protrusion.

After the actuator 10, which is an auxiliary brake means, is operated, the elevator is mechanically locked, thereby ensuring passenger safety even when the braking force of the main brake is lost.

Therefore, at this time, the current of the electric motor 7 is cut off to prevent overheating of the electric motor 7.

Since the brake failure is a fatal failure, the manager informs the manager of the failure with an alarm sound (alarm) and waits for the elevator to stop until the troubleshooting is completed. (S38)

In another embodiment of the present invention, the method of the motor braking by the motor control and the auxiliary brake means are mixed, but any one of the methods may be considered.

For example, in the case of using only the method of stopping the elevator by braking by motor control, once the loss of brake braking force is detected to reduce the load torque applied to the motor to the maximum, the vehicle stops on a nearby floor to evacuate the passenger. After moving secondly to the middle of the floor and stopping the elevator on the floor, the electric current may be applied to the motor for a long time.

In the present invention, the auxiliary brake means uses a stopper coupling coupled to the motor shaft. However, the auxiliary brake means may be coupled around the sheave or the brake drum. In particular, in the case of using an elevator hoist with a flywheel structure, If the protrusion is formed on the flywheel to engage with the actuator, the auxiliary brake means can be simply formed.

Therefore, according to the present invention, even if the mechanical braking force of the brake is lost due to some reason, the elevator is forced to drive to the door opening position by the torque control of the electric motor, and then the brake is continuously braked by the auxiliary brake means to raise or lower the elevator. Free fall in the direction can be completely prevented, so as to improve the safety of the passengers and stop the elevator completely by controlling the electric motor, and then use the method to prevent the movement of the elevator. There is no effect.

Claims (5)

In an elevator equipped with an elevator drive motor, a cage driven up and down by the motor, a brake device for stopping the elevator drive system, a brake abnormality detection unit for detecting that the braking force of the brake device is lost, and the brake device includes: The motor is operated by an actuator operating when the braking force is lost, an emergency speed command generation unit for outputting an emergency speed command when the brake abnormality detection unit loses brake braking force, and an emergency speed command output from the emergency speed command generation unit. The elevator brake control apparatus, characterized in that further comprises a torque control for emergency control. 2. The brake control apparatus of an elevator according to claim 1, further comprising an auxiliary brake means which is operated when the actuator is operated. 3. The brake control apparatus of an elevator according to claim 2, wherein the auxiliary brake means is constituted by a stopper coupling. 4. The brake control apparatus of an elevator according to claim 3, wherein the stopper coupling has an engagement structure between members having protrusions. The first step of generating a brake command from the operation control unit to the brake device to stop the elevator at a predetermined position, and whether the elevator is completely stopped by the brake command generated by receiving the detection signal of the brake abnormality detection unit from the operation control unit. A second step of checking whether the brake stops and the brake is judged to be normal when the elevator stops. If the elevator does not stop, a third step of checking whether the brake command is normal and the brake command is abnormal. A fourth step of setting a signal indicating that the brake braking force is lost when there is enough time required for the brake to operate when it is determined or there is no abnormality, and through the emergency torque control unit according to the set of the emergency speed command generator. assistant And a fifth step of operating the brake means to stop the elevator on the lower floor in a low speed operation, and then resetting the brake braking force loss signal so as not to restart the elevator.