KR100901229B1 - Elevator device - Google Patents

Abstract

In the elevator device, the traveling of the car is braked by the first and second brake devices. The operation of the first and second brake devices is controlled by the brake control unit. When the emergency stop command of the car is issued, the brake control unit first brakes the first brake device, and brakes the second brake device when the deceleration of the car after a predetermined time elapses is less than or equal to the predetermined value.

Description

Elevator device {ELEVATOR DEVICE}

The present invention relates to an elevator device having first and second brake devices for braking travel of a car.

In the conventional elevator apparatus, several brake apparatuses for making an emergency stop of a cage | basket | car are provided in the hoisting machine. If an emergency stop signal is issued during retrograde operation, the emergency stop torque TS required to stop the car at the remaining distance from the current position of the car to the end floor ahead of the driving direction and the car are stopped. The required stop holding torque TL is calculated to maintain the state. The larger one of TS and TL is selected as the required braking torque T, and the car is emergency stopped by generating the required braking torque T with the minimum number of brake devices (see Patent Document 1, for example). .

Patent Document 1: Japanese Patent Application Laid-Open No. 2001-278572

However, in the conventional elevator apparatus as described above, arithmetic processing and system configuration become complicated.

This invention is made | formed in order to solve the above subjects, Comprising: It aims at obtaining the elevator apparatus which can prevent excessive deceleration at the time of a sudden stop command generation by a simple structure.

An elevator apparatus according to the present invention includes a brake control unit for controlling the operation of a car, first and second brake devices for braking the car, and first and second brake devices, wherein the brake control unit is an elevator. When the stall stop command is issued, the first brake device is first braked, and the second brake device is braked when the deceleration of the car after a predetermined time elapses is less than or equal to the predetermined value.

BRIEF DESCRIPTION OF THE DRAWINGS The block diagram which shows the elevator apparatus by Embodiment 1 of this invention.

FIG. 2 is a circuit diagram illustrating a control circuit of the first and second brake devices of FIG. 1. FIG.

FIG. 3 is a flowchart showing the operation of the brake control unit of FIG. 1. FIG.

4 is a timing chart showing the relationship between car speed, car acceleration, first contact state, and second contact state when a sudden stop command occurs during the regenerative operation of the elevator apparatus of FIG. 1;

FIG. 5 is a timing chart showing the relationship between car speed, car acceleration, a first contact state, and a second contact state when a sudden stop command occurs during retrograde operation of the elevator apparatus of FIG. 1; FIG.

6 is a timing chart showing a relationship between a car speed, a car acceleration, a first contact state, and a second contact state when an emergency stop command of the elevator apparatus of FIG. 1 occurs.

EMBODIMENT OF THE INVENTION Hereinafter, preferred embodiment of this invention is described with reference to drawings.

Embodiment 1.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the elevator apparatus by Embodiment 1 of this invention. The car 1 and the counterweight 2 are suspended in the hoistway by the main rope 3, and the hoist 1 lifts the inside of the hoistway by the driving force of the hoisting machine 4. The hoist 4 has a drive sheave 5 in which the main rope 3 is wound, a motor 6 for rotating the drive sheave 5, and a braking means 7 for braking the rotation of the drive sheave 5. have.

The brake means 7 includes a brake pulley 8 which is integrally rotated with the drive sheave 5 and first and second brake devices 9 and 10 that brake the rotation of the brake pulley 8. Have The first brake device 9 includes a first brake shoe 11 which is folded to the brake pulley 8 and a first brake shoe 11 to the brake pulley 8. First brake spring (not shown) which presses, and 1st brake release which opens the 1st brake shoe 11 from the brake pulley 8 in opposition to a 1st brake spring. (release) has a coil (12).

The second brake device 10 includes a second brake shoe 13 folded on the brake pulley 8 and a second brake spring for pressing the second brake shoe 13 onto the brake pulley 8 ( Not shown) and a second brake release coil 14 which opens the second brake shoe 13 from the brake pulley 8 as opposed to the second brake spring.

The motor 6 is provided with a speed detector 15 for generating a signal corresponding to the rotational speed of the rotary shaft, that is, the rotational speed of the drive sheave 5. As the speed detector 15, an encoder is used, for example.

The control panel 16 is provided with a power converter 17 such as an inverter for supplying electric power to the motor 6 and an elevator control device 18. The elevator control device 18 has a running control unit 19 and a brake control unit 20. The driving control unit 19 controls the power converter 17 and the brake control unit 20 in accordance with the signal from the speed detector 15. The brake control unit 20 controls the first and second brake devices 9 and 10 according to the command from the travel control unit 19 and the signal from the speed detector 15.

Specifically, the brake control unit 20 normally brakes the first and second brake devices 9 and 10 when the car 1 is stopped on the stationary floor, thereby stopping the car 1. Keep it. When the brake devices 9 and 10 issue a command to suddenly stop the car 1, first, the brake device 9 is braked and the deceleration of the car 1 after a predetermined time elapses ( When the absolute value of negative acceleration) is less than or equal to the predetermined value, the second brake device 10 is braked.

In addition, the brake control unit 20 immediately brakes both of the first and second brake devices 9 and 10 when an emergency stop command with a higher emergency level than the sudden stop command is issued. The emergency stop command and the emergency stop command are issued by a safety monitoring device or the like for monitoring the safety of the elevator device and input to the brake control unit 20.

Here, the sudden stop command is issued when, for example, a failure of the speed detector 15, a failure of the power converter 17, an excessive speed of the car 1, or the like is detected. That is, the sudden stop command is issued when the motor 6 cannot be controlled, but the control of the brake devices 9 and 10 is possible. Therefore, when the sudden stop command is issued, the power supply to the motor 6 is cut off quickly. The emergency stop command is issued when, for example, the car 1 has reached the end of the hoistway.

The elevator control apparatus 18 is comprised by the computer which has an arithmetic processing unit (CPU), a memory | storage part (ROM, RAM, a hard disk, etc.), and a signal input / output part. The functions of the travel control unit 19 and the brake control unit 20 are realized by a computer. That is, a program for realizing the functions of the driving control unit 19 and the brake control unit 20 is stored in the storage unit of the computer.

FIG. 2 is a circuit diagram illustrating a control circuit of the first and second brake devices 9 and 10 of FIG. 1. The first and second brake release coils 12 and 14 are connected in parallel to the power supply 21. The first contact 22 is connected in series to the first brake release coil 12. By closing the first contact 22, electric power is supplied to the first brake release coil 12, and the first brake device 9 is released. By opening the first contact 22, the power supply to the first brake release coil 12 is cut off, and the first brake device 9 brakes.

The second contact 23 is connected in series to the second brake release coil 14. By closing the second contact 23, electric power is supplied to the second brake release coil 14, and the second brake device 10 is released. By opening the second contact 23, the power supply to the second brake release coil 14 is cut off, and the second brake device 10 brakes.

The first diode 24 and the first electrical resistor 25 are connected in parallel to the first brake release coil 12. The circuit composed of the first diode 24 and the first electrical resistance 25 is adapted to control the brake control unit 20 from the counter electromotive force generated in the first brake release coil 12 upon opening of the first contact 22. To protect.

The second diode 26 and the second electrical resistance 27 are connected in parallel to the second brake release coil 14. The circuit composed of the second diode 26 and the second electrical resistor 27 is adapted to control the brake control unit 20 from the counter electromotive force generated in the second brake release coil 14 upon opening of the second contact 23. To protect.

Next, the operation will be described. 3 is a flowchart illustrating an operation of the brake control unit 20 of FIG. 1. The brake control unit 20 repeatedly executes the operation shown in FIG. 3 at a predetermined cycle.

The brake control unit 20 monitors whether the car 1 is stopped (step S1), whether an emergency stop command has been issued (step S2), and whether a sudden stop command has been issued (step S3). . And if the cage | basket | car 1 is stopped, the counter value shall be 0 (step S4). When an emergency stop command is issued, a command to turn off the first and second contacts 22 and 23 is output (step S5). If neither the emergency stop instruction nor the sudden stop instruction is issued while the car 1 is traveling, the meeting processing ends. In other words, the car 1 continues to travel.

If the emergency stop command is not issued while the car 1 is traveling and a sudden stop command is issued, a command to turn off the first contact 22 is output (step S6), and 1 is added to the counter value. (Step S7). Thereafter, it is determined whether or not the counter value reaches a preset set value t1, that is, whether a predetermined time has elapsed after outputting a command to turn off the first contact 22 according to the sudden stop command (step) S8). If the counter value does not reach the set value t1 (cnt < t1), the processing is terminated.

t1), 엘리베이터 칸(1)의 가속도가 문턱값 αL 이상인지의 여부를 판정한다(단계 S9). 바꾸어 말하면, 엘리베이터 칸(1)의 감속도가 소정값 이하인지의 여부를 판정한다. 엘리베이터 칸(1)의 가속도는 속도 검출기(15)로부터의 신호에 의해 구한 속도를 차분(差分) 처리 또는 하이패스 필터 처리함으로써 구할 수 있다.When the counter reaches the set value t1 (cnt

t1), It is determined whether the acceleration of the cage | basket | car 1 is more than the threshold value (alpha) L (step S9). In other words, it is determined whether the deceleration of the cage | basket | car 1 is below a predetermined value. The acceleration of the cage | basket | car 1 can be calculated | required by the differential process or the high pass filter process the speed calculated | required by the signal from the speed detector 15.

When the acceleration of the cage | basket | car 1 is smaller than the threshold value (alpha) L (acceleration <alpha), the meeting process is complete | finished. In other words, the first contact 22 is opened, and the second contact 23 continues to be monitored in a closed state. When the acceleration of the cage | basket | car 1 is more than the threshold value alpha L, ie, when the deceleration of the cage | basket | car 1 is below a predetermined value, the command which turns off the 2nd contact point 23 is output (step S10).

4 shows the relationship between the car speed, the car acceleration, the state of the first contact 22 and the state of the second contact 23 when a sudden stop command occurs during the regenerative operation of the elevator apparatus of FIG. This is a timing chart. The speed is shown by making the traveling direction of the car 1 positive. During the regenerative operation of the elevator device, the gravity acceleration in a direction where it is difficult to stop the car 1, such as when the car 1 is rising to no load or when the car 1 is lowered to the full load. It's working.

When the sudden stop command occurs at time tO, the first contact point 22 is immediately opened. At that time, since the power supply to the motor 6 is cut off, the speed of the cage | basket | car 1 becomes high by the gravity acceleration only for one instant until the braking force by the 1st brake apparatus 9 actually arises. However, when the 1st brake shoe 11 is pressed by the brake pulley 8 and a braking force generate | occur | produces, the cage | basket | car 1 will begin to decelerate.

Then, at time t1, since the acceleration of the cage | basket | car 1 is more than the threshold value αL, the 2nd contact 23 is opened and the braking force by the 2nd brake apparatus 10 is also applied. As mentioned above, since it is difficult to stop the cage | basket | car 1 at the time of regenerative operation, even if it brakes both the 1st and 2nd brake devices 9 and 10, deceleration will not become excessive.

FIG. 5 shows the relationship between the car speed, the car acceleration, the first contact 22 state, and the second contact 23 state when a sudden stop command occurs during retrograde operation of the elevator apparatus of FIG. 1. This is a timing chart. During the retrograde operation of the elevator device, the gravity acceleration in the direction in which the car 1 is easy to stop, such as when the car 1 descends without load or when the car 1 rises to a full circle. It's working.

When the sudden stop command occurs at time tO, the first contact point 22 is immediately opened. At that time, the power supply to the motor 6 is cut off, and the deceleration of the cage | basket | car 1 starts by gravity acceleration. Then, when the 1st brake shoe 11 is pressed by the brake pulley 8 and a braking force generate | occur | produces, the deceleration of the cage | basket | car 1 becomes further large.

At the time t1, since the acceleration of the car 1 is smaller than the threshold value αL, the monitoring of the acceleration is continued as it is. At the time point t2, the second contact 23 is opened at the point where the acceleration becomes equal to or greater than the threshold αL, and a braking force by the second brake device 10 is also applied.

Here, the back driving is driving in the direction in which the car 1 is easy to stop, so the acceleration of the car 1 is monitored, and the car 1 is mainly driven only by the braking force of the first brake device 9. By slowing down, the deceleration of the cage | basket | car 1 can be prevented from becoming excessive, and the unpleasant feeling to give to the passenger in the cage | basket | car 1 can be reduced. Moreover, since a braking force is applied to the 2nd brake apparatus 10 at the point which fully decelerated, when the cage | basket | car 1 stops completely, the elevator by the 1st and 2nd brake apparatuses 9 and 10 will lift. The compartment 1 can be stopped more reliably. That is, according to the elevator apparatus of Embodiment 1, it can prevent that the deceleration at the time of a sudden stop command generation becomes excessive by a simple structure.

In addition, when the resin-coated rope whose outer peripheral part is covered with resin is used as the main rope 3, since the frictional force between the main rope 3 and the drive sheave 5 becomes large, when the deceleration becomes excessive, the main rope 3 There is a possibility that the resin may be damaged due to the slippage of). However, according to the configuration of the embodiment 1, excessive reduction speed does not occur, so that damage to the resin is prevented.

FIG. 6 is a timing chart showing the relationship between the car speed, the car acceleration, the state of the first contact 22 and the state of the second contact 23 when the emergency stop command of the elevator apparatus of FIG. 1 occurs. . When an emergency stop command occurs at time t0, the first and second contacts 22, 23 are simultaneously opened immediately. Thereby, the braking force by the 1st and 2nd brake apparatuses 9 and 10 generate | occur | produces simultaneously, and the cage | basket | car 1 is stopped quickly.

For example, when the car 1 has reached the end of the hoistway, when the first and second brake devices 9 and 10 are braked at the same time to collide with the shock absorber (not shown) provided at the end. It is possible to stop the car 1 with an impact smaller than the impact generated.

In addition, although the acceleration of the cage | basket | car 1 was calculated | required from the output of the speed detector 15 attached to the hoisting machine 4 in the said example, the output of the speed detector installed in another position, such as a governor or a cage | basket | car, for example. The acceleration of the car may be obtained from the equation.

In addition, although the brake control part 20 was provided as a part of the function of the elevator control apparatus 18 in the said example, you may install in other apparatuses, such as the safety monitoring apparatus which monitors safety of an elevator apparatus, for example.

The brake control unit may be configured as an independent device from the elevator control device and the safety monitoring device.

Moreover, the function of a brake control part can also be implement | achieved by the electric circuit which processes an analog signal.

Moreover, in the above example, although the 1st and 2nd brake apparatuses 9 and 10 were provided in the hoisting machine 4, you may install in the other position. That is, the first and second brake devices may be, for example, a car brake mounted on a car, a rope brake that holds the main rope and brakes the car.

Moreover, you may arrange | position a 1st brake apparatus and a 2nd brake apparatus in another place.

In the above example, two brake devices 9 and 10 are used, but three or more brake devices may be used. In this case, the brake device may be divided into first and second groups, and the same control as in the first embodiment may be performed.

According to this invention, the elevator apparatus which has the 1st and 2nd brake apparatus which brakes running of a cage | basket | car can be provided.

Claims (2)

Elevator Car, First and second brake devices for braking driving of the car, and A brake control unit for controlling operations of the first and second brake devices, When the emergency stop command of the car is issued, the brake controller first brakes the first brake device, and when the deceleration of the car after a predetermined time elapses is equal to or less than a predetermined value, the second brake device. Elevator device, characterized in that for braking operation. The method of claim 1, And the brake control unit immediately brakes the first and second brake devices when an emergency stop command with a higher emergency level is issued than the emergency stop command.

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