CN119263012A - Dynamic torque diagnosis device and dynamic torque diagnosis method for winch brake - Google Patents

Abstract

The present invention relates to a dynamic torque diagnostic device for a hoisting machine brake and a dynamic torque diagnostic method for a hoisting machine brake, which can detect dynamic torque by software without adding a new device for monitoring dynamic torque and can automatically measure periodically without applying load to elevator devices. When no user is in the car, the car is held by a brake, a hoist torque is applied in a balance weight direction in this state, a fine speed running control is performed, the hoist torque when the hoist rotates beyond a static holding torque of the brake is detected, a dynamic torque of the hoist is calculated by adding a balance torque for compensating for a load imbalance to the detected hoist torque, and a braking force of the hoist brake is diagnosed based on whether the calculated dynamic torque exceeds a reference value.

Description

Dynamic torque diagnostic device and dynamic torque diagnostic method for hoist brake

Technical Field

The embodiment of the invention relates to a dynamic torque diagnostic device and a dynamic torque diagnostic method for a winch brake.

Background

When the elevator is stopped in an emergency due to power failure or abnormality detection during running, power to a hoist driving the elevator is cut off, and a brake is closed to apply emergency braking. At this time, if the brake force is strong, a strong impact is applied to the user in the car, and therefore, the deceleration is legally set to 1G (G: gravitational acceleration) or less. On the other hand, if the brake force is too weak, the car may collide with the pit or the hoistway top without stopping, and therefore, an appropriate dynamic torque of the brake must be maintained.

Conventionally, dynamic torque is often detected manually by an operator. Further, there is a method in which rotation of the sheave is detected by a magnetic detector, and vibration of the sheave is detected by an acceleration detector, thereby determining brake wear and sheave wear when emergency braking is applied. Further, a method is known in which, when the car is not occupied, a high-speed ascent operation is automatically performed and an emergency stop is performed, and a brake force is calculated from the deceleration.

However, in the above conventional example, a new device for monitoring dynamic torque is required. In addition, in the conventional example in which emergency braking is intentionally performed during high-speed ascending traveling, there is a problem in that the load on elevator equipment such as ropes is large, and if the elevator equipment is routinely operated, the life of various equipment is shortened.

Disclosure of Invention

The invention provides a dynamic torque diagnostic device and a dynamic torque diagnostic method for a hoisting machine brake, which can detect dynamic torque by software without adding a new device for dynamic torque monitoring and can automatically measure periodically without applying load to elevator devices.

In an elevator in which a car is suspended by a main rope and a counterweight is balanced by a main rope and the car is driven by rotation of a hoist, a dynamic torque diagnostic device for a hoist brake according to an embodiment is provided with a brake control unit, a motor control unit, and a brake dynamic torque determination unit.

The brake control unit holds the car by the hoisting machine brake when no user is present in the car. The motor control unit applies a hoist torque in a counterweight direction in a state where the car is held by a hoist brake, and performs a fine speed running control. A brake dynamic torque determination unit detects a winch torque when the winch rotates beyond a static holding torque of the brake, calculates a dynamic torque of the winch by adding a balance torque for compensating for load unbalance to the detected winch torque, and diagnoses a braking force of the winch brake based on whether the calculated dynamic torque exceeds a reference value.

According to the above-described dynamic torque diagnostic device for a hoisting machine brake, a dynamic torque diagnostic device for a hoisting machine brake and a dynamic torque diagnostic method can be provided, and the dynamic torque can be detected by software without adding a new device for dynamic torque monitoring, and automatic measurement can be performed periodically without applying a load to the elevator device.

Drawings

Fig. 1 is a block diagram showing the structure of an embodiment.

Fig. 2 is a flowchart showing the processing steps of the embodiment.

Fig. 3 is a flowchart showing processing steps of other embodiments.

Detailed Description

< Constitution of embodiment >

Fig. 1 is a block diagram showing a system configuration according to an embodiment of the present invention.

As shown in the figure, a car 1 is connected to a counterweight 3 via a main rope 2, and is lifted (UP running) or lowered (DN running) by a hoist 4. The hoisting machine 4 is provided with two brakes (double brake) of a first brake 5 and a second brake 6. A rotation detector 7 for detecting the rotation speed of the motor for driving the hoist 4 and a current detector 8 for detecting the current flowing through the motor of the hoist 4 are provided, and the detected rotation speed and current detection value are output to the elevator control device 10.

The elevator control device 10 according to the embodiment constitutes a dynamic torque diagnostic device for a hoisting machine brake, and includes a motor control unit 11, a brake control unit 12, a brake dynamic torque determination unit 13, a dynamic torque diagnostic command output unit 14, and a determination result output unit 15.

The motor control unit 11 receives the rotation speed from the rotation detector 7 that detects the rotation speed of the hoist 4, and controls the driving of the motor of the hoist 4 based on the current detection value fed back from the hoist 4.

The brake control unit 12 controls braking of the first brake 5 and the second brake 6.

When the dynamic torque diagnostic command is input, the brake dynamic torque determination unit 13 outputs a determination command to the motor control unit 11 and the brake control unit 12, and performs a determination process of the brake dynamic torque.

The dynamic torque diagnostic command output unit 14 outputs a dynamic torque diagnostic command to the brake dynamic torque determination unit 13 in consideration of the passenger presence information and the call registration information.

The determination result output unit 15 outputs the determination result of the calculated dynamic torque of the hoisting machine 4 to a monitoring center or the like.

< Processing step of embodiment >

Measurement treatment

Fig. 2 shows the steps of the "measurement process" according to the embodiment, and fig. 3 shows the steps of the "determination process" according to the embodiment.

In the measurement process shown in fig. 2, it is determined whether or not a certain time has elapsed since the previous measurement, for example, when 3 days have elapsed since the previous measurement, it is determined that the measurement time has come (step S1). The "3 days" for a certain period of time is an example of a case where daily monitoring is desired, and can be arbitrarily set. Further, since the braking force of the hoisting machine brake varies depending on the ambient temperature and the season, the measurement cycle may be changed depending on the ambient temperature and the season.

Next, if the stopped state of the car 1 continues for a certain period of time, for example, "3 minutes" (step S2), it is confirmed that there is no user in the car by a load signal, a monitoring camera, or the like (step S3). Here, the "3 minutes" as a certain time is only an example, and may be a period of time in which no user is present, such as late night or early morning. When it is assumed that there is no user, the elevator control device 10 confirms that there is no user in the car 1 based on the load signal and the image information from the monitoring camera or the like. In addition, the case where no call registration information is confirmed. When the confirmation is obtained, the dynamic torque diagnostic command output unit 14 outputs a dynamic torque diagnostic command to the brake dynamic torque determination unit 13. The brake dynamic torque determination unit 13 outputs a brake control command to the brake control unit 12. Then, a process (1) of calculating the torque of the balance weight (balance torque) in order to compensate for the load unbalance is performed (step S4). The calculation of the balance torque is performed by measuring the torque of the balance weight when the car 1 is driven at a constant speed.

The brake control unit 12 can perform opening and closing control of a brake that is one system of a double brake individually. The brake control unit 12 opens the second brake 6, for example, and holds the car 1 only by the first brake 5 of the other system (step S5). In this state, the hoist torque is applied in the direction (ascending direction) of the counterweight (C/W) 3, and the fine speed running control is performed (step S6). When the static holding torque of the brake is exceeded, the sheave of the hoisting machine 4 rotates while pulling the brake, and it is determined whether or not a constant speed is detected (step S7). A process (2) of detecting and recording the winding machine torque at the time of the low-speed running is executed (step S8).

The dynamic torque of the brake is calculated by adding ((1) + (2)) the detected hoist torque and the balance torque (the torque compensating for the load imbalance) (step S9). The calculation is also carried out in the second brake 6 of the other system.

Determination processing

Fig. 3 shows a process for determining the measured dynamic torque.

When the measured dynamic torque is equal to or less than the reference value (step S11), the dynamic torque measurement process shown in fig. 2 is repeated a predetermined number of times, for example, 3 times (step S12). The "reference value" refers to a case where the reference value is predetermined or a case where the decrease amount from the last measured value exceeds a predetermined decrease amount although the reference value is within.

When the dynamic torque measurement process is repeated a predetermined number of times, the brake is pulled, whereby the brake that has been shifted from the sheave returns to its original position and is brought into a state of friction with each other, and the recovery of the brake torque is expected. When the dynamic torque returns to the reference value or more (yes in step S13), the determination process ends.

When the dynamic torque is lower than the reference value even after the dynamic torque measurement process is repeated a predetermined number of times (no in step S13), an alarm is output from the determination result output unit 15 to the monitoring center or the like (step S14).

As described above, according to the embodiment of the present invention, it is possible to automatically and periodically perform dynamic torque measurement without applying a load to the elevator equipment.

Further, by periodically monitoring the hoisting machine torque, a predictive diagnosis of torque reduction can be performed, and maintenance such as brake adjustment and replacement can be planned in advance.

Conventionally, in the case where periodic checks are manually performed on an annual basis, the quality determination is performed on the basis of a criterion obtained by anticipating a decrease amount after 1 year, but the criterion can be relaxed by increasing the check frequency.

< Variant >

In the above embodiment, when the decrease in dynamic torque is detected, the service performance is reduced when the elevator is stopped, and therefore, the rated speed may be reduced and the operation may be continued. Thus, even if the emergency brake is applied in a state where the dynamic torque is reduced, the car 1 can be prevented from traveling to the end due to the deviation of the stop position caused by the reduction of the braking force. In addition, the speed can be reduced and varied according to the conditions of the load and the operation direction, or the speed can be reduced only in the vicinity of the end without uniformly reducing the speed. This can maintain safe operation without impairing the service for the user.

While the present invention has been described with reference to several embodiments, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other modes, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

Claims (4)

1. A dynamic torque diagnostic device for a hoisting machine brake, in an elevator in which a car and a counterweight are suspended by a main rope and the car is driven by rotation of a hoisting machine, the dynamic torque diagnostic device for a hoisting machine brake comprising: A brake control unit that holds the car by means of a hoisting machine brake when there is no user in the car; a motor control unit that applies a hoisting machine torque in a direction of a counterweight to implement a slow-speed travel control while the car is held by a hoisting machine brake; and The brake dynamic torque determination unit detects the hoist torque when the hoist rotates beyond the static holding torque of the brake, calculates the dynamic torque of the hoist by adding the detected hoist torque to the balancing torque that compensates for the load imbalance, and diagnoses the braking force of the hoist brake based on whether the calculated dynamic torque exceeds a reference value. 2. The dynamic torque diagnostic device for a winch brake according to claim 1, wherein: When the dynamic torque of the hoisting machine brake is lower than a reference value, the dynamic torque determination process is repeatedly performed a plurality of times. If the dynamic torque is still lower than the reference value even after the determination process is performed a plurality of times, an alarm is output to a monitoring center. 3. The dynamic torque diagnostic device for a winch brake according to claim 1 or 2, wherein: When the hoisting machine brake has two systems, namely, a first brake and a second brake, the brake control unit performs opening and closing control on the brakes of the two systems individually. The brake dynamic torque determination unit is: In the detection of the dynamic torque of the first brake, the winch torque is detected when the vehicle is controlled to travel at a slow speed in the direction of the balancing weight with the second brake open, and the dynamic torque of the first brake is calculated by adding the detected winch torque of the first brake to the balancing torque for compensating for the load imbalance. In the detection of the dynamic torque of the second brake, the hoisting machine torque when the vehicle is controlled to travel at a slow speed in the direction of the balancing weight with the first brake released is detected, and the dynamic torque of the second brake is calculated by adding the detected hoisting machine torque of the second brake to the balancing torque. The calculated dynamic torques of the first brake and the second brake are compared with a predetermined reference value, thereby diagnosing the braking forces of the first brake and the second brake. 4. A method for diagnosing dynamic torque of a winch brake, wherein: When there is no user in the car, the car is held by the brake. In this state, the hoisting machine torque is applied in the direction of the counterweight to implement slow speed travel control. Detects the hoist torque when the hoist rotates beyond the static holding torque of the brake, The dynamic torque of the winch is calculated by adding the balancing torque to compensate for the load imbalance to the detected winch torque. The braking force of the winch brake is diagnosed based on whether the calculated dynamic torque exceeds the reference value.