CN105270953A - Control device of elevator device, and elevator device thereof - Google Patents

Abstract

The present invention suppresses the aggravation of wear of the friction member due to repeated emergency stops during high-speed running, and prevents the reduction in braking capability caused by this effect, thereby obtaining stable braking force. The control device of the elevator device of the present invention applies an operation signal to the braking device of the elevator device having a traction machine for lifting and lowering the elevator car and a braking device for applying a braking force to the traction machine. The control device includes: detecting An abnormality detection unit for abnormality of the elevator device; an action control unit for applying an emergency braking force to the traction machine via the braking device when an abnormality of the elevator device is detected; and a table for storing the reference value of the car speed and the reference value of the number of braking times, When the abnormality detection part detects that the car speed at the time of abnormality is above the reference value of the car speed, an emergency braking force is applied to the hoisting machine via the brake device, and the cumulative value of the times of applying the emergency braking force is equal to the number of times of braking. When it exceeds the reference value, the car speed after limitation.

Description

Control devices for elevator installations and elevator installations

technical field

The present invention relates to a control device for an elevator device and the elevator device, and more particularly to a control device for an elevator device that performs an emergency stop operation stably and reliably by using a brake device provided on a hoisting machine, and an elevator device equipped with the same.

Background technique

As a brake device for a traction machine installed in an elevator device, there is known a structure in which a friction member is pressed against a body to be braked to perform braking. Generally, when an abnormality is detected, the control device is operated to decelerate the elevator device. . However, in an elevator whose car runs at a high speed, since the kinetic energy of the entire system is large, the sliding distance of the friction member increases during emergency braking. Therefore, there is a problem that the wear of the friction member is increased and the braking ability is reduced, and there is a need to prevent the elevator from continuing to run in a state where the braking ability is reduced.

In contrast, in Patent Document 1, a braking capability confirmation mode is provided as a detection function of the elevator apparatus. In this mode, when the elevator is running at the rated speed, the braking device installed on the traction machine is operated to perform an emergency stop, and the braking capacity of the braking device is checked by measuring the deceleration and braking distance of the car, thereby Determine whether the braking ability is abnormal.

In addition, Patent Document 2 discloses a brake device for an elevator traction machine that detects that the wear of the friction member has increased by measuring the distance between the holding surface and the braking surface of the friction member of the brake device and Notify monitoring station.

prior art literature

patent documents

Patent Document 1: Japanese Unexamined Patent Publication No. 2011-42480

Patent Document 2: Japanese Unexamined Patent Publication No. 2013-79121

Contents of the invention

The problem to be solved by the invention

Generally, in a braking device that presses a friction member against a body to be braked for braking, it is known that the braking capability decreases when the wear of the friction member increases.

However, in the case of an elevator device with a general inverter control method, the deceleration of the car during normal operation is completed by the speed control based on the inverter control of the traction machine, and the braking device is only used for the stop of the car. maintained, so the wear of the friction parts does not increase. However, when an abnormality occurs during operation and the car is stopped suddenly, since the car is decelerated and stopped, the brake device is used for emergency braking, so that the wear of the friction members increases. Therefore, when the elevator recovers, it is necessary to check whether the braking capacity of the braking device is reduced.

However, in the description of the above-mentioned Patent Document 1, since it is necessary to make the elevator run and make an emergency stop when judging the braking capacity, for the type of elevator whose car speed is high and the wear amount of the friction parts caused by emergency braking is large , there is a problem that the braking capability of the braking device is reduced when emergency braking is performed for the purpose of determining the braking capability. In addition, if the determination of the braking ability is limited to a speed at which the wear amount of the friction member is small in order to prevent this problem, there is a problem that the determination accuracy is low.

In addition, in the description of the above-mentioned Patent Document 2, since a switch for detecting the change in the distance between the holding surface and the braking surface needs to be provided outside the elevator braking device near the friction surface, there is an applicable brake structure that increases the overall size of the device. Restrictions and other issues.

The present invention is made in view of the above-mentioned problems in the prior art, and an object of the present invention is to provide a brake device for an elevator device and an elevator device that can be used without being affected by the brake structure, and can suppress the occurrence of emergency stop from high-speed operation. Repeatedly, the abrasion of the friction member increases, and the reduction of the braking ability due to this effect can be prevented, so that a stable braking force can be obtained.

Technical solutions for solving problems

In order to achieve the above object, the present invention provides a control device for an elevator device, which applies a brake to the brake device of the elevator device having a traction machine for raising and lowering the elevator car and a brake device for applying a braking force to the traction machine. action signal,

Wherein, the above-mentioned control device includes: an abnormality detection unit that detects an abnormality of the above-mentioned elevator device; an operation control unit that applies an emergency braking force to the above-mentioned hoisting machine via the above-mentioned braking device when an abnormality of the above-mentioned elevator device is detected; and a storage car A table of reference values of speed and number of braking times, when the abnormality detection unit detects that the car speed at the time of abnormality is equal to or greater than the reference value of the car speed, an emergency is applied to the hoisting machine via the braking device. As for the braking force, when the cumulative value of the number of times of application of the emergency braking force is equal to or greater than the reference value of the number of times of braking, the above-mentioned car speed after that is limited.

Invention effect

According to the present invention, it is possible to provide a braking device and an elevator device for an elevator device that suppress the increase in wear of friction members due to repeated emergency stops from high-speed operation and prevent a decrease in braking capability due to the influence.

Description of drawings

Fig. 1 is a schematic diagram showing the structure of an elevator apparatus and its control device.

FIG. 2 is a flowchart showing a determination process of an emergency operation control unit.

detailed description

Embodiments of the present invention will be described below based on the drawings.

(Example)

As shown in Figure 1, an elevator device 1 includes: a car 3 that is lifted and lowered in a lift passage 2 formed in a building; a counterweight 5 connected to the car 3 through a main sling 4; In the machine room installed on the top, the traction machine 11 that lifts the car 3 and the counterweight 5 by winding the main rope 4;

Furthermore, the hoisting machine 11 of the elevator device 1 includes: a sheave 12 around which the main rope 4 is wound; an unillustrated motor that rotates the sheave 12; a rotating braked body 13 ; and a braking device 14 that brakes the rotation of the braked body 13 .

In the embodiment of FIG. 1 , the braking device 14 applies a braking force to the braked body 13 of the traction machine 11 when the operation stops. The braking device 14 is provided on the hoisting machine 11, and is constituted by an electromagnetic brake that applies a braking force to the motor of the hoisting machine 11 when stopped. In addition, the specific structures of the hoisting machine 11, the braked body 13, and the braking device 14 are omitted since they are not directly related to the present invention.

On the other hand, the control device 7 of the elevator apparatus 1 includes a computer on which a CPU, ROM, RAM, etc. are mounted, and is installed in a machine room or the like together with the hoisting machine 11 . The control device 7 has a function of operation control during normal operation of the elevator apparatus 1, and functions of an abnormality detection unit 22, an operation control unit 23, and a meter unit 24 for stop control in an emergency.

The control device 7 of the elevator apparatus 1 takes in the running speed of the car 3 as its input for operation control during normal operation and stop control in an emergency. Therefore, a governor 15 that is driven by a governor rope 16 in conjunction with the operation of the car 3 is provided on the side of the elevator apparatus 1 . The speed governor 15 is provided for detecting and adjusting the running speed of the car 3 , and the speed governor 15 is provided with a speed detection device 21 . This speed detection device 21 detects the rotation speed of the governor 15 and outputs it to the operation control unit 23 of the control device 7 .

The operation control unit 23 in the control device 7 first calculates the speed of the car 3 from the number of revolutions of the governor 15 . On top of this, during normal operation, a drive signal S1 is applied to a motor (not shown) that rotates the sheave 12 of the hoisting machine 11 to control the rotational speed of the motor to a desired value. In addition, since the present invention focuses on control during emergency, detailed description of operation control during normal operation will be omitted.

The abnormality detection unit 22 in the control device 7 detects an equipment abnormality and a control abnormality that must stop the operation of the elevator device 1 in order to respond to the control device 7 in an emergency. When an abnormality is detected by the abnormality detection unit 22, the operation control unit 23 applies the emergency stop signal S2 to the braking device 14 provided in the hoisting machine 11, and controls its operation by applying an emergency braking force. In addition, when the emergency stop signal S2 is issued, the driving signal S1 to the traction machine is also rapidly reduced based on the emergency stop signal S2. Quick stop operation of the device These two stop operations.

In addition, in FIG. 1, in order to perform the judgment process of the operation control part 23 in an emergency, the reference speed etc. of the car speed at the time of emergency stop are memorize|stored in the table 24. The operation control unit 23 refers to the table 24, and when the number of times of emergency braking in the running state of a predetermined car speed or higher reaches a certain value, limits the rated speed of the elevator thereafter.

FIG. 2 is a flowchart showing the processing operation of the control device 7 when an emergency stop occurs. Using this figure, the flow of processing performed by the operation control unit 23 when an emergency stop occurs will be described. In addition, the processing shown in each of the following flowcharts is executed by reading a predetermined program into the control device 7 of the computer.

In step S101 at the beginning of Fig. 2, the abnormality that must make the operation of elevator device 1 stop is detected by abnormality detection part 22, action control part 23 receives this information and sends control device action instruction S2 (emergency stop signal S2) in step S102, In step S103, the braking device 14 is activated. In addition, in the process of step S102, it is also effective to rapidly decrease the drive signal S1 sent to the hoisting machine side based on the emergency stop signal S2 simultaneously with the emergency stop signal S2.

In the process of step S104, the speed value Vc (detected speed) of the car 3 detected by the speed detection device 21 is read at the time when the operation of the brake device 14 is confirmed (braking start time). In addition, regarding this reading timing, this reading may be performed in conjunction with the abnormality detection by the abnormality detection part 22, for example, it may be performed at the time of step S102 or step S103. The speed measured in step S102 and step S103 may have some errors, but the difference can be expected in advance.

Next, in step S105, the speed data V0 (reference speed) set in advance in the table part 4 is taken in. In step S106, the magnitude relationship between the detected speed Vc and the reference speed V0 is determined. Here, the detected speed Vc, which is the speed value of the car 3 detected when the braking device 14 operates, is the braking start speed.

If the result of the comparison in step S106 is that the braking start speed Vc is equal to or greater than the reference speed V0, the cumulative number of emergency braking times N is counted by +1 in step S107Y, and if the braking start speed Vc is lower than the reference speed V0 Next, in step S107Y, the value of the cumulative number of emergency braking times N is maintained without being changed. The number of emergency braking times since the high-speed operation above the reference speed is thus stored.

Next, in step S108, the emergency braking times data N0 (cumulative emergency braking reference number) set in the table 24 is read out, and in step S109, the magnitude relationship between the cumulative emergency braking number N and the cumulative emergency braking reference number N0 is determined. .

If the result of determination in step S109 is that the accumulated number of emergency braking times N is equal to or greater than the accumulated emergency braking reference number N0, the process proceeds to step S110Y. When step S110Y is selected, the operation control unit 23 restricts the rated speed Vmax to V' after the elevator recovers from this point in time. And in step S111, a notification is made to the maintenance company, thereby reminding the maintenance personnel to perform readjustment of the brake device.

On the other hand, if the result of determination in step S109 is that the accumulated number of emergency braking times N is smaller than the accumulated emergency braking reference number of times N0, the operation of the elevator is continued without changing the value of the rated speed in step S110N.

In this way, when the number of times of emergency braking above the rated car speed reaches a certain value, the operation control unit 23 will limit the rated speed to run after the elevator recovers, thereby preventing repeated emergency stops during high-speed operation from causing frictional parts The increased wear of the brakes prevents the reduction of braking ability caused by its influence.

In addition, the reference speed V0 at this time and the reference value of the cumulative reference number of emergency braking N0 are set in the system according to the applied elevator specification, the structure of the braking device, the rated braking torque and the wear rate data of the friction parts. within the range in which the braking capacity of the actuator will not be reduced.

Through the above-mentioned processing flow in Fig. 2, the elevator device only counts and accumulates the number of times of emergency braking during high-speed operation (speed range exceeding the reference speed V0). run at rated speed. At this time, the limited rated operating speed may be lower than the reference speed V0. As a result, even if emergency braking occurs at the rated operating speed, the influence on the wear of the braking device can be minimized.

In addition, the degree of wear of the brake device can be confirmed by contacting the maintenance company (step S111). As a result, the limited rated operating speed state is continued until safe operation such as replacement of the brake device is confirmed. Return to the original high-speed operation state.

In addition, in the actual design, the reference speed V0 and the cumulative emergency braking reference number N0 are set in consideration of the wear of the brake device. The reference number of times N0 of braking is about 10 times. In addition, it is preferable to set the car speed at the time of limited operation when the cumulative emergency braking reference number N0 is greater than or equal to about 50% of the reference speed V0 or less.

In the present invention thus constituted, it is possible to suppress an increase in wear of friction members due to repeated emergency stops during high-speed running, and to prevent a reduction in braking capability due to the influence. In addition, compared with the method of providing a switch for detecting the change of the distance between the friction surface and the braking surface near the friction surface, the present invention does not need to install other devices in the braking device, so the overall size of the device can be realized.

The effects of the present invention and its embodiments are further described in detail. Generally, it is known that the wear rate of the resin friction member used in the brake device of the elevator tends to increase as the temperature increases, and the wear amount of the friction member of the brake device is related to the pushing force on the braked body. The pressing surface pressure is related to the sliding distance.

The sliding distance of the friction member during emergency braking is related to the kinetic energy of the entire system of the elevator apparatus. When the rated speed of the elevator is doubled, the sliding distance of the friction member is approximately quadrupled. In addition, the friction heat generated during braking makes the friction surface become high temperature, so the wear rate of the friction parts increases, and the wear is intensified.

Therefore, when there is concern about damage to the friction members due to repeated emergency braking during high-speed operation, temporarily limiting the rated speed of the elevator to run has a great effect on suppressing the aggravation of wear of the friction members. Furthermore, stable braking force can be obtained by preventing a reduction in braking ability due to its influence.

Next, modifications and alternative embodiments of the present invention will be described. The present invention is not limited to the above-described embodiments, and includes various conceivable forms without departing from the gist of the present invention. For example, in this embodiment, the speed detection device 21 is provided in the speed governor 15, but it may also be provided in other devices such as a motor of a traction machine.

In addition, multiple reference speeds V0 and cumulative emergency braking reference times N0 can also be set separately. After the determination of the number of times of emergency braking N (step S109), the determination of the next reference speed V0' and the accumulated reference number of times of emergency braking N0' is repeated (steps S105-S109). At this time, it is also possible to judge the two kinds of count data N1 and N2 by using the respective cumulative count counts (step S109 ).

In addition, the control device 7 of the present invention is not limited to be applied to an elevator apparatus in which a traction machine is arranged in a machine room at the top of the hoistway 2, but can also be applied to an elevator apparatus in which a hoistway is arranged in the hoistway. At this time, the control device 7, the traction machine 11 and the governor are arranged in the lifting passage 2, and other structures are the same as those of the embodiment of the present invention.

Explanation of reference signs

1...Elevator device

2...lifting passage

3... car

4...Main sling

5...counterweight

6...Steering wheel

7...control device

11... Traction machine

12...Rope pulley

13...Actuated body

14...Brake device

15...Governor

16...Governor rope

21...Speed detection device

22... Abnormal detection device

23...Motion control device

24... table.

Claims (9)

1. A control device for an elevator apparatus, which applies an actuation signal to the braking apparatus of the elevator apparatus having a traction machine for raising and lowering an elevator car and a braking apparatus for applying a braking force to the traction machine, the The control device of described elevator installation is characterized in that: The control device includes: an abnormality detection unit that detects an abnormality of the elevator apparatus; an operation control unit that applies an emergency braking force to the hoisting machine via the brake device when an abnormality in the elevator apparatus is detected; and a table storing the reference value of the car speed and the reference value of the number of braking times, When the abnormality detecting unit detects that the car speed at the time of abnormality is equal to or higher than the reference value of the car speed, an emergency braking force is applied to the hoisting machine via the brake device, and the number of times the emergency braking force is applied When the cumulative value of is greater than or equal to the reference value of the number of braking times, the speed of the car after limitation is determined. 2. The control device of the elevator device according to claim 1, characterized in that: The limited car speed is set lower than the reference value of the car speed. 3. The control device of the elevator device as claimed in claim 1 or claim 2, characterized in that: The reference value of the speed of the car and the reference value of the number of times of braking are determined according to the degree of wear of the braking device. 4. An elevator device, comprising: a traction machine for lifting and lowering the elevator car; a braking device for applying a braking force to the traction machine; and a control device for applying an action signal to the braking device, the elevator The device is characterized by: The control device includes: an abnormality detection unit that detects an abnormality of the elevator; an operation control unit that applies an emergency braking force to the traction machine via the braking device when the abnormality detection unit detects an abnormality in the elevator; and a storage car A table of reference values of speed and number of braking times, When the abnormality detecting unit detects that the car speed at the time of abnormality is equal to or higher than the reference value of the car speed, an emergency braking force is applied to the hoisting machine via the brake device, and the number of times the emergency braking force is applied When the cumulative value of is greater than or equal to the reference value of the number of braking times, the speed of the car after limitation is determined. 5. The elevator device according to claim 4, characterized in that: The limited car speed is set lower than the reference value of the car speed. 6. The elevator device according to claim 4 or claim 5, characterized in that: The reference value of the speed of the car and the reference value of the number of times of braking are determined according to the degree of wear of the braking device. 7. An elevator device, comprising: a traction machine for lifting and lowering the elevator car; and a brake device for applying a braking force to the traction machine, the elevator device is characterized in that: When the speed of the car at the time of abnormal detection of the elevator is greater than or equal to the reference value, an emergency braking force is applied to the hoisting machine via the braking device, and when the number of times the emergency braking force is applied is more than a predetermined number of times, the subsequent car is limited. speed. 8. The elevator device according to claim 7, characterized in that: The traction machine is driven by an inverter drive motor, and when an abnormality of the elevator is detected, the inverter drive motor is used to perform deceleration control of the traction machine. 9. The elevator apparatus according to claim 8, characterized in that: When the speed of the car at the time of abnormal detection of the elevator is lower than the reference value, the deceleration control of the hoisting machine is performed by the inverter drive motor.