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

Abstract

The present invention relates to a dynamic torque diagnostic device for a winch brake and a dynamic torque diagnostic method for a winch brake, which can detect a dynamic torque through software without adding a new device for monitoring the dynamic torque, and can periodically perform automatic measurement without applying a load to an elevator device. When there is no user in the car, the car is held by the brake, and in this state, a winch torque is applied in the direction of the balance weight to implement a low-speed travel control, and the winch torque when the winch rotates beyond the static holding torque of the brake is detected. The dynamic torque of the hoist is calculated by adding the detected hoist torque to a balance torque that compensates for the load imbalance, and the braking force of the hoist brake is diagnosed on the basis of whether the calculated dynamic torque exceeds a reference value.

Description

Technical Field

[0001] Embodiments of the present invention relate to a dynamic torque diagnosis device and a dynamic torque diagnosis method for a winch brake. Background Art

[0002] When an elevator stops in an emergency due to a power outage or abnormality detection during operation, the power to the hoist that drives the elevator is cut off, closing the brake and applying emergency braking. At this time, if the brake force is strong, it will exert a strong impact on the users in the car, so the deceleration is legally stipulated to be less than 1G (G: gravitational acceleration). On the other hand, if the brake force is too weak, the car may not stop and collide with the pit or the top of the shaft, so it is necessary to maintain an appropriate dynamic torque of the brake.

[0003] In the past, the dynamic torque detection was mostly performed manually by the operator. In addition, there is a method that detects the rotation of the sheave by a magnetic detector and the vibration of the sheave by an acceleration detector, thereby judging the wear of the brake and the wear of the sheave when the emergency brake is applied. In addition, there is also a known method that automatically performs high-speed ascending operation and emergency stop when there is no one in the car, and calculates the brake force based on the deceleration.

[0004] However, in the above-mentioned previous examples, a new device for monitoring dynamic torque is required. In addition, in the previous examples of intentionally making emergency braking when traveling at high speed, the load on elevator equipment such as ropes is large, and if it is carried out on a daily basis, there is a disadvantage that the life of various equipment is shortened. Summary of the invention

[0005] The problem to be solved by the present invention is to provide a dynamic torque diagnosis device and a dynamic torque diagnosis method for a hoisting machine brake, which can detect dynamic torque by software without adding new equipment for dynamic torque monitoring and can automatically measure it regularly without applying load to the elevator equipment.

[0006] A dynamic torque diagnostic device for a hoisting machine brake according to an embodiment includes a brake control unit, a motor control unit, and a brake dynamic torque determination unit in an elevator in which a car and a counterweight are suspended by main ropes and the car is driven by rotation of a hoisting machine to travel.

[0007] The brake control unit holds the car by the hoisting machine brake when there is no user in the car. The motor control unit applies a hoisting machine torque in the direction of the counterweight to implement slow speed travel control while the car is held by the hoisting machine brake. The brake dynamic torque determination unit detects the hoisting machine torque when the hoisting machine rotates in excess of the static holding torque of the brake, adds a balancing torque for compensating for load imbalance to the detected hoisting machine torque to calculate the dynamic torque of the hoisting machine, and diagnoses the braking force of the hoisting machine brake based on whether the calculated dynamic torque exceeds a reference value.

[0008] According to the dynamic torque diagnostic device for the hoisting machine brake, a dynamic torque diagnostic device and a dynamic torque diagnostic method for the hoisting machine brake can be provided, and dynamic torque can be detected by software without adding new equipment for dynamic torque monitoring, and automatic measurement can be performed regularly without applying load to the elevator equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a block diagram showing the structure of an embodiment.

[0010] Figure 2 It is a flowchart showing the processing steps of the implementation mode.

[0011] Figure 3 It is a flowchart showing the processing steps of other embodiments. DETAILED DESCRIPTION

[0012] <Configuration of Embodiment>

[0013] Figure 1 It is a block diagram showing the system configuration according to the embodiment of the present invention.

[0014] As shown in the figure, the car 1 is connected to the counterweight 3 through the main rope 2, and is raised (UP travel) or lowered (DN travel) through the hoist 4. The hoist 4 is provided with two brake systems (double brake), namely, the first brake 5 and the second brake 6. In addition, a rotation detector 7 for detecting the rotation speed of the motor driving the hoist 4 and a current detector 8 for detecting the current flowing in 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.

[0015] The elevator control device 10 of the embodiment constitutes a dynamic torque diagnosis 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 diagnosis command output unit 14 , and a determination result output unit 15 .

[0016] The motor control unit 11 receives the rotation speed from the rotation detector 7 that detects the rotation speed of the hoisting machine 4 and controls the driving of the motor of the hoisting machine 4 based on the current detection value fed back from the hoisting machine 4 .

[0017] The brake control unit 12 controls braking of the first brake 5 and the second brake 6 .

[0018] When the dynamic torque diagnosis 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 to perform a determination process of the brake dynamic torque.

[0019] The dynamic torque diagnosis command output unit 14 outputs a dynamic torque diagnosis command to the brake dynamic torque determination unit 13 in consideration of the passenger presence information and the call registration information.

[0020] The determination result output unit 15 outputs the determination result on the calculated dynamic torque of the hoisting machine 4 to a monitoring center or the like.

[0021] <Processing steps of embodiment>

[0022] 《Measurement Processing》

[0023] Figure 2 The steps of the "measurement process" of the embodiment are shown. Figure 3 This section shows the steps of the “determination process” of the embodiment.

[0024] exist Figure 2 In the measurement process shown, it is determined whether a certain time has passed since the last measurement. For example, when 3 days have passed since the last measurement, it is determined that the measurement period has arrived (step S1). "3 days" as a certain time is an example of a situation where daily monitoring is desired, and it can be set arbitrarily. In addition, the braking force of the winch brake varies according to the ambient temperature and season, so the measurement cycle can also be changed according to the ambient temperature and season.

[0025] Next, if the stopped state of the car 1 continues for a certain period of time, such as "3 minutes" (step S2), the situation that there are no users in the car is confirmed by means of load signals, surveillance cameras, etc. (step S3). Here, "3 minutes" as a certain period of time is also just an example, for example, it can also be a time period when there are no users, such as late at night or early in the morning. When it is assumed that there are no users, the elevator control device 10 confirms that there are no users in the car 1 based on the load signal, image information from the surveillance camera, etc. In addition, it is also confirmed that there is no call registration information. If confirmation is obtained, the dynamic torque diagnosis instruction output unit 14 outputs a dynamic torque diagnosis instruction to the brake dynamic torque determination unit 13. The brake dynamic torque determination unit 13 outputs a brake control instruction to the brake control unit 12. Then, the process (1) of calculating the torque of the balancing weight (balancing torque) to compensate for the load imbalance is performed (step S4). Regarding the calculation of the balancing torque, it is calculated by measurement each time the torque of the balancing weight when the car 1 is traveling at a certain speed is measured.

[0026] The brake control unit 12 can independently perform opening and closing control on the brake of one system that becomes a dual brake. The brake control unit 12, for example, opens the second brake 6 and holds the car 1 only by the first brake 5 of the other system (step S5). In this state, a hoisting machine torque is applied in the direction (upward direction) of the counterweight (C / W) 3 to perform slow travel control (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 a certain speed is detected (step S7). The process (2) of detecting and recording the hoisting machine torque during the slow travel is performed (step S8).

[0027] The dynamic torque of the brake is calculated by adding the detected hoisting machine torque to the balancing torque (torque for compensating for load imbalance) ((1)+(2)) (step S9). This calculation is also performed in the second brake 6 of the other system.

[0028] 《Determination Processing》

[0029] Figure 3 The following shows the determination process of the measured dynamic torque.

[0030] When the measured dynamic torque is less than the reference value (step S11), Figure 2 The dynamic torque measurement process shown is repeated a predetermined number of times, for example, three times (step S12). Here, "reference value" refers to the following two cases: a case where it is a predetermined reference value, or a case where the value is within the reference value but the decrease from the last measurement value exceeds a predetermined decrease amount.

[0031] When the dynamic torque measurement process is repeated a predetermined number of times, the brake is pulled, and the brake that has been offset from the sheave returns to its original position and becomes a state of mutual friction, and the recovery of the brake torque is expected. When the dynamic torque is restored to a reference value or above (yes in step S13), the determination process is terminated.

[0032] If the dynamic torque is still 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 a monitoring center or the like (step S14 ).

[0033] As described above, according to the embodiment of the present invention, dynamic torque measurement can be automatically and regularly performed without placing a burden on the elevator equipment.

[0034] Furthermore, by regularly monitoring the hoisting machine torque, it is possible to perform a diagnosis of a sign of torque reduction, and to make a plan for maintenance such as brake adjustment or replacement in advance.

[0035] Conventionally, when periodic inspections are manually performed on an annual basis, the quality is determined based on a criterion based on the amount of reduction expected after one year. However, by increasing the inspection frequency, the criterion value can be relaxed.

[0036] <Example of Change>

[0037] In the above embodiment, if the reduction of dynamic torque is detected, the serviceability will be reduced if the elevator is stopped, so the rated speed can be reduced and the operation can be continued. Therefore, even if the emergency brake is applied in the state of reduced dynamic torque, it is possible to prevent the car 1 from running 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 running direction, or the speed can be reduced only near the end, instead of uniformly reducing the speed. In this way, safe operation can be maintained without compromising the serviceability to users.

[0038] Several embodiments of the present invention have been described above, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These new embodiments can be implemented in various other ways, and various omissions, substitutions and changes can be made without departing from the scope of the invention. These embodiments and their variations are included in the scope and purpose of the invention, and are included in the invention described in the claims and their equivalents.

Claims

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.

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