JP7042184B2 - Elevator, elevator maintenance and inspection system and elevator abnormality diagnostic device - Google Patents

Description

The present invention relates to an elevator abnormality diagnosis technique.

There is a technology to detect brake drag among the abnormalities that occur in elevators. For example, in Patent Document 1, "the load in the car is detected as a ratio to the rated load capacity in the car at the start of operation, and the detected load in the car, the rated load capacity L in the car, and the ratio of the counterweight to the rated load capacity in the car". By determining the brake drag judgment value in relation to the balance point BP indicating, the rope wheel diameter D, the constant K determined by roping, and the rated torque Tm of the motor, and comparing the torque command value during steady running with the brake drag judgment value. , Detects brake drag as an abnormality in the braking device (abstract excerpt). ”The technology is disclosed.

Japanese Unexamined Patent Publication No. 2014-227233

In the technique disclosed in Patent Document 1, a determination value is set for the motor torque command value during steady running of the elevator, and the two are compared to detect a brake drag abnormality. Therefore, the brake drag during steady running can be detected. However, there is also a need for detection of brake drag in a travel mode other than steady travel, such as when accelerating immediately after the start of elevator travel.

Brake drag is not the only cause of elevator abnormalities that appear as abnormal motor torque command values. For example, there are a state in which an overload state cannot be detected due to deterioration of the anti-vibration rubber, and a defect in the end-floor speed reducer installed near the end-floor such as the top floor and the bottom floor to decelerate the car.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique for accurately detecting the occurrence of an abnormality in an elevator and estimating the cause of the abnormality regardless of the traveling mode of the elevator. ..

INDUSTRIAL APPLICABILITY The present invention comprises a motor for driving a rope wheel around which a main rope with a car attached to one end and a counterweight connected to the other end is wound, a load detecting device for detecting the load of the car, and the motor. An elevator including a current detector that detects a motor current that is a current flowing through the vehicle, a rotary encoder, and a position / speed detection device that detects the speed and position of the car based on the output pulse of the rotary encoder. , The load, the motor current, the position and speed of the car, and the torque limit value previously held in the storage device are used to calculate a torque command value which is a torque to be applied to the motor. When the torque calculation unit, the abnormality presence / absence determination unit for determining the presence / absence of an abnormality in the elevator using the torque command value and the torque threshold held in advance, and the abnormality presence / absence determination unit determine that there is an abnormality, the load is loaded. An abnormality cause estimation unit that estimates the cause of the abnormality that is the cause of the abnormality using the load and the load determination value that is held in the storage device in advance, and an output unit that outputs the abnormality cause estimated by the abnormality cause estimation unit. If the torque command value is equal to or greater than the torque threshold value for a predetermined period or longer in one run of the car, the abnormality determination unit determines that there is an abnormality and determines that the abnormality is present. The cause estimation unit compares the load with the load determination value, and if the load is equal to or greater than the load determination value, estimates that the cause of the abnormality is an overload undetectable state, and the load is the load. If it is less than the determination value, the cause of the abnormality is presumed to be a brake drag, which is an abnormality of the braking device that restrains the driving of the rope wheel .

According to the present invention, it is possible to accurately detect the occurrence of an abnormality in the elevator and estimate the cause of the abnormality regardless of the traveling mode of the elevator. Issues, configurations and effects other than those described above will be clarified by the description of the following embodiments.

It is a schematic diagram which shows the structural example of the elevator of 1st Embodiment. It is a functional block diagram of the control panel of the elevator of 1st Embodiment. (A) is an explanatory diagram for explaining the stored data of the determination value storage unit of the first embodiment, and (b) is a diagram showing an example of the hardware configuration of the control panel of the first embodiment. Is. It is a figure which shows the state of the change of the speed and torque command value at the time of normal running of an elevator of 1st Embodiment. It is a figure which shows the state of the change of the speed and torque command value at the time of an abnormal running of an elevator of 1st Embodiment. It is a flowchart of the torque command value calculation processing of 1st Embodiment. It is a flowchart of the abnormality diagnosis processing of 1st Embodiment. It is a flowchart of the abnormality diagnosis processing of the 2nd Embodiment. It is explanatory drawing for demonstrating the torque threshold value of the modification of this invention.

<< First Embodiment >>
Hereinafter, the first embodiment of the present invention will be described with reference to the drawings.

In the present embodiment, the torque command value, which is the command value of the torque required for the motor, is calculated by using the output of the load detection sensor installed in the elevator, the current detector of the motor, and the rotary encoder. Then, the torque command value is compared with a predetermined torque limit value, and when the torque command value exceeds the torque limit value, it is determined that there is an abnormality. Then, the cause of the abnormality is estimated using the output of the load detection sensor at that time.

[Elevator]
First, the configuration of the elevator 100 of the present embodiment will be described. FIG. 1 is a schematic diagram showing a configuration example of the elevator 100 of the present embodiment.

As shown in this figure, the elevator 100 of the present embodiment includes a car 101, a load detection sensor 102, a motor 103, a rotary encoder 104, a control panel 107, a sheave 108, a brake device 109, and the like. The balance weight 110, the main rope 111, and the end floor deceleration detection switch 112 are provided.

The braking device 109 restrains the sheave 108 and brakes the car 101 that moves up and down in the hoistway 114. The balance weight 110 reduces the load when the car 101 is raised and lowered. The main rope 111 is wound around a sheave 108 to connect the car 101 and the balance weight 110.

The motor 103 drives the sheave 108. A current detector (see FIG. 2) 113 for detecting a current flowing through the motor 103 (hereinafter referred to as a motor current) is attached to the motor 103. The motor current detected by the current detector 113 is output to the elevator control device 105.

The load detection sensor 102 is installed at the lower part of the car 101, for example, and outputs a signal proportional to the load capacity of the car 101 (hereinafter referred to as a load). The signal from the load detection sensor 102 is output to the elevator control device 105.

The load detection sensor 102 is composed of, for example, a non-contact current sensor mounted under the car 101, a detection plate, and an anti-vibration rubber under the car. The load detection sensor 102 captures the amount of deflection of the anti-vibration rubber under the car when loaded in the car 101 with a non-contact current sensor, and outputs this as an output value (signal) to the elevator control device 105.

The rotary encoder 104 is attached to the motor 103, and outputs an output pulse corresponding to the rotation of the motor 103 to the elevator control device 105.

The end floor deceleration detection switch 112 is attached in front of the end floors such as the top floor and the bottom floor in the hoistway 114, and detects the passage of the car 101. When the car 101 passes in front of the end floor deceleration detection switch 112, for example, a passing signal indicating passing is output to the elevator control device 105.

The control panel 107 controls the operation of the entire elevator 100. In the present embodiment, the traveling of the car 101 is controlled, and the cause of the abnormal load on the motor 103 that drives the car 101 is estimated and diagnosed.

The control panel 107 of the present embodiment includes an elevator control device 105 and an elevator abnormality diagnosis device 106. FIG. 2 is a functional block diagram of the elevator control device 105 and the elevator abnormality diagnosis device 106 of the present embodiment, mainly focusing on the functions of the present embodiment.

The elevator control device 105 controls the operation of the elevator 100 in response to instructions from users, maintenance personnel, and the like, and outputs from various detection devices included in the elevator 100.

The elevator abnormality diagnosis device 106 monitors the operating state of the elevator 100 and diagnoses the abnormality. In the present embodiment, it is determined whether the torque limiter of the motor 103 has been operated while the car 101 is running, and during one running, for a predetermined period or longer (for example, 120 ms or longer, continuously or intermittently). If it works, it is judged to be abnormal. Then, the abnormality of the elevator is diagnosed by estimating the cause of the abnormality according to the load capacity (load load) at that time.

[Elevator control device]
As shown in FIG. 2, the elevator control device 105 includes a torque calculation unit 151, a motor control unit 152, a storage unit 153, a load calculation unit 154, a position speed calculation unit 155, and an end floor deceleration detection unit 156. , Equipped with.

The storage unit 153 stores data necessary for realizing each process of the elevator control device 105, data generated during each process, and data generated by executing the process. In the present embodiment, for example, the torque limit value which is the maximum value of the torque command value is stored.

The load calculation unit 154 calculates the load capacity (load load) of the car 101 using the output value of the load detection sensor 102. The calculation result is output to the torque calculation unit 151. In the present embodiment, the load detection sensor 102 and the load calculation unit 154 constitute a load detection device.

As described above, the load of the car 101 is calculated based on the amount of bending of the anti-vibration rubber under the car. The load calculation unit 154 sets the initial value when the elevator 100 is installed. In this initial value set, first, the car 101 is set to a no-load state (loading 0%), and the output value of the load detection sensor 102 at that time is acquired. Then, it is stored in the storage unit 153 in association with the non-loading state (loading 0%). Next, a weight with a rated load capacity is loaded on the car 101 to bring it into a rated load state (loading 100%), and the output value of the load detection sensor 102 at that time is acquired. Then, it is stored in the storage unit 153 in association with the rated sanction state (loading 100%). Based on these two points, the relationship between the amount of deflection of the anti-vibration rubber under the car and the output value of the load detection sensor 102 is determined, and thereafter, using that relationship, the load capacity of the car 101 is determined from the output value of the load detection sensor 102. Is calculated.

If the load calculation unit 154 exceeds a predetermined value equal to or greater than the rated load capacity of the car 101, the load calculation unit 154 determines that the load is overloaded, notifies the user with a buzzer, or the like, and stops the vehicle. The determination value (overload detection value) used when detecting the overload is set to, for example, about 105% of the rated load. The overload detection value is stored in the storage unit 153 in advance.

The position / speed calculation unit 155 calculates the position and speed of the car 101 using the output pulse of the rotary encoder 104. The calculation result is output to the torque calculation unit 151. In the present embodiment, the rotary encoder 104 and the position / speed calculation unit 155 constitute a position / speed detection device.

The position of the car 101 is calculated by creating a table in which the number of output pulses is associated with the position of the car when the elevator 100 is installed, and by counting the number of output pulses during operation. do. Velocity is obtained, for example, by counting the number of output pulses per unit time.

The end-floor deceleration detection unit 156 detects whether or not the car 101 is decelerating the end-floor based on the output of the end-floor deceleration detection switch 112. When it is detected that the end-floor deceleration is in progress, an end-floor deceleration signal indicating that the end-floor deceleration is in progress is output. The end-floor deceleration detection switch 112 and the end-floor deceleration detection unit 156 constitute an end-floor deceleration detection device.

In the present embodiment, the end-floor deceleration detection unit 156 detects that the car 101 has passed the installation position of the end-floor deceleration detection switch 112 in the hoistway 114, and outputs an end-floor deceleration signal. More specifically, after the car 101 passes the position of the end floor deceleration detection switch 112 installed in front of the top floor when ascending, until it stops, and when the car 101 descends, it is in front of the bottom floor. The end-floor deceleration signal is output to the torque calculation unit 151 until the switch passes through the installed end-floor deceleration detection switch 112 position and stops.

The end floor deceleration detection unit 156 detects the speed of the car 101 from the position speed calculation unit 155 at the timing when it detects that the car 101 has passed the installation position of the end floor deceleration detection switch 112. , May be configured to be output together. Further, at this time, if the detected speed of the car 101 is equal to or higher than a predetermined value, a signal for forcibly stopping the car 101 or decelerating to a normal speed is sent by the elevator control device 105. It may be configured to output to a processing unit that controls the traveling of the car 101. Further, in the present embodiment, the end-floor deceleration detection unit 156 and the end-floor deceleration detection switch 112 may not be provided.

The torque calculation unit 151 calculates a torque command value, which is a command value of torque (motor torque) applied to the motor 103 when the car 101 is running. The motor torque during running is determined according to the running command and the load capacity (load load), position, and speed of the car 101. The torque calculation unit 151 of the present embodiment includes a load that is the output of the load calculation unit 154, a detection current that is the output of the current detector 113, and a position and speed of the car 101 that is the output of the position / speed calculation unit 155. And the torque limit value stored in the storage unit 153 are used to calculate the torque command value.

In the present embodiment, the torque calculation unit 151 first uses the outputs of the load calculation unit 154, the position / speed calculation unit 155, and the current detector 113, and at that time, the optimum torque value applied to the motor 103 ( Required torque) is calculated. Here, the torque calculation unit 151 converts the output value of the load detection sensor 102 obtained via the load calculation unit 154 into a current value that can be compared with the current value that is the output value of the current detector 113. Further, the pulse waveform of the rotary encoder 104 obtained via the position / velocity calculation unit 155 is converted into a current value that can be compared with the current value obtained from the current detector 113 and the load detection sensor 102, respectively. Then, these are combined and calculated to calculate the optimum torque value (required torque) to be applied to the motor 103.

Then, the torque calculation unit 151 calculates the required torque, and then compares the calculated required torque with the torque limit value stored in the storage unit 153. When the required torque is less than the torque limit value, the required torque is output as the torque command value. On the other hand, when the required torque is equal to or greater than the torque limit value, the torque limit value is output as the torque command value.

The calculated torque command value is output to the motor control unit 152 and the elevator abnormality diagnosis device 106. It is transmitted to the elevator abnormality diagnosis device 106 together with the load used when calculating the torque command value. At this time, the torque limit value may also be transmitted.

When the motor control unit 152 receives the torque command value from the torque calculation unit 151, the motor control unit 152 controls the drive of the motor 103 so that the torque value generated by the motor 103 matches the torque command value.

[Elevator abnormality diagnostic device]
The elevator abnormality diagnosis device 106 includes an abnormality presence / absence determination unit 161, an abnormality cause estimation unit 162, an output unit 163, and a determination value storage unit 164.

The determination value storage unit 164 stores a determination value used for determining whether or not an abnormality has occurred. In the present embodiment, as shown in FIG. 3A, a torque limit value 164a, a counter determination value 164b, and a load determination value 164c are stored.

The torque limit value 164a is the same value as the torque limit value used in the elevator control device 105. For example, the value set in the elevator control device 105 is received from the elevator control device 105 and stored.

The counter determination value 164b is a determination value used for determining a period in which the required torque exceeds the torque limit value 164a in the abnormality diagnosis process described later. It is set in advance and stored in the determination value storage unit 164.

The load determination value 164c is a determination value used for determining whether or not an overload cannot be detected in the abnormality diagnosis process described later. It is set in advance and stored in the determination value storage unit 164.

The abnormality presence / absence determination unit 161 determines the presence / absence of an abnormality in the elevator 100 by using the torque command value calculated by the torque calculation unit 151, the torque limit value 164a, and the counter determination value 164b. In particular, in the present embodiment, it is determined whether or not an abnormality has occurred in the running of the motor 103, that is, the car 101. The determination result is output to the abnormality cause estimation unit 162.

In the present embodiment, the abnormality presence / absence determination unit 161 determines that there is an abnormality when the period in which the torque limit value is set in the torque command value becomes a predetermined period or more during one running of the car 101. The counter determination value 164b is used to determine whether or not the period is a predetermined period.

In this embodiment, the torque command value is used to determine the presence or absence of abnormality in this way. The torque command value of the motor 103 in the normal state changes as shown in FIG. 4, for example.

FIG. 4 is a diagram showing changes in the speed 210 and the torque command value 220 when the car 101 is traveling, and the relationship between the torque command value 220 and the torque limit value 230. The horizontal axis indicates time, and the vertical axis indicates speed 210 and the corresponding torque command value 220. Here, the case of ascending operation under heavy load on the car is shown.

The torque command value 220 changes according to the change of the speed 210 in each traveling phase of the accelerating traveling 211, the steady traveling 212, and the decelerating traveling 213 of the car 101. The torque command value 220 during the steady running 212 is substantially constant. On the other hand, the absolute value of the torque command value 220 becomes large at the time of acceleration running 211 and at the time of deceleration running 213. However, as long as the vehicle is running normally, the torque command value 220 does not exceed the torque limit value 230.

FIG. 5 is a diagram showing a state of change in the torque command value 221 when there is an abnormality in the elevator 100 (when the elevator is abnormally traveling). When the elevator 100 has an abnormality such as an overload state or a brake abnormality, the motor 103 requires a large torque. Therefore, the torque calculation unit 151 calculates a value equal to or greater than the torque limit value as the required torque. However, the torque calculation unit 151 has a torque limiter function and controls so as not to output a torque command value exceeding the torque limit value. Therefore, the torque limit value is output as the torque command value.

The abnormality presence / absence determination unit 161 of the present embodiment utilizes this characteristic to output a torque limit value as a torque command value during one running, that is, during acceleration running 211, steady running 212, and deceleration running 213. If the period to be applied is longer than the specified period, it is determined that there is an abnormality.

When the abnormality presence / absence determination unit 161 determines that there is an abnormality, the abnormality cause estimation unit 162 estimates the abnormality cause that is the cause of the abnormality by using the load received from the elevator control device 105 and the load determination value 164c. .. The estimation result is output to the output unit 163.

As described above, for example, when the overload cannot be detected in the load detection device or the brake device 109 is dragged (brake drag), the calculated required torque exceeds the torque limit value 230 and the torque command value 221. The torque limit value 230 is calculated as.

The abnormality cause estimation unit 162 estimates the cause of the torque limit value 230 being output as the torque command value 221 based on the calculation result of the load calculation unit 154. Specifically, when the loaded load is the load determination value 164c or more, it is estimated that the overload cannot be detected. On the other hand, when the load is less than the load determination value 164c, it is presumed that the brake drag is an abnormality of the brake device 109.

Normally, when the load of the car 101 is equal to or less than the above-mentioned overload detection value (for example, 105%), the torque command value does not reach the torque limit value. Therefore, when the torque command value reaches the torque limit value, it is possible that the car 101 has been driven without being able to detect such an overload with a load larger than the overload detection value. Is high.

As described above, the load capacity of the car 101 is calculated by the amount of bending of the anti-vibration rubber under the car. However, the anti-vibration rubber under the car hardens due to deterioration over time. In such a state, a difference occurs between the actual load capacity of the car 101 and the load capacity calculated by using the load detection device. For example, if the actual load capacity of the car 101 is 108% of the rated load capacity, it should be calculated as 108%, but it may be calculated as less than 105%.

For example, if the overload detection value is set to 105% of the rated load capacity, and the original load capacity is 108%, it should be detected as an overload, but the anti-vibration rubber under the car deteriorates. If so, it will not be detected. That is, the overload cannot be detected.

In the present embodiment, when the load is at least a predetermined value and the torque command value reaches the torque limit value, it is estimated that the overload cannot be detected. In order to make such an estimation, the load determination value 164c is set to a value lower than the overload detection value. For example, 90% of the rated load is set.

That is, when the abnormality cause estimation unit 162 of the present embodiment is in a state where the torque limit value is output as the torque command value even though only 90% of the rated load is loaded, for example, vibration isolation under the car. It is presumed that the overload cannot be detected due to deterioration of the rubber.

In the case where the overload cannot be detected, the elevator control device 105 tries to apply more motor torque during traveling because the load is heavier than the assumed car load capacity. However, when the torque command value has reached the torque limit value, no more torque can be applied. Therefore, at the start of traveling of the elevator 100, there is a possibility that an abnormal state may occur, such as reversing with respect to the traveling direction.

The brake dragging state is a state in which the brake device 109 of the elevator travels while operating for some reason.

The output unit 163 receives the abnormality cause estimated by the abnormality cause estimation unit 162 and outputs it to the outside. In the present embodiment, the output is output to the maintenance terminal 120 carried by the maintenance staff via the network 130.

As shown in FIG. 3B, the control panel 107 includes a CPU (Central Processing Unit) 171 that performs various operations, a ROM (Read Only Memory) that stores a program for executing the operations by the CPU 171 and the like. A storage device 173 such as an HDD (Hard Disk Drive), a memory 172 such as a RAM (Random Access Memory) which is a work area when a CPU executes a program, an input / output interface (I / F) 175, and a communication interface. It is composed of hardware including (I / F) 174 and software stored in the storage device 173 and executed by the CPU 171.

Each of the above functions is realized by the software and the hardware working together by reading the program or the like stored in the storage device 173 into the memory 172 and operating according to the control of the CPU 171.

Further, various data used for processing each function, various data generated during processing, and data generated by each function are stored in a memory or a storage device.

In addition, all or a part of the functions may be realized by hardware such as ASIC (Application Specific Integrated Circuit) and FPGA (field-programmable gate array).

[Maintenance terminal]
The maintenance terminal 120, which has received the cause of the abnormality from the elevator abnormality diagnosis device 106, notifies the maintenance personnel of the cause of the abnormality by outputting the output to the user interface.

The user interface is, for example, a display device or an audio output device. In the maintenance terminal 120, the cause of the abnormality is displayed on the display device, and the cause of the abnormality is output from the audio output device.

The maintenance terminal 120 is realized by, for example, a portable information processing device including a CPU, a memory, a storage device, a user interface, and a communication interface. The maintenance terminal 120 constitutes an elevator maintenance / inspection system by transmitting / receiving data to / from the control panel 107.

[Torque command value calculation processing]
Next, the flow of torque command value calculation processing by the torque calculation unit 151 of the elevator control device 105 will be described. FIG. 6 is a processing flow of the torque command value calculation processing of the present embodiment. This process is started when the car 101 starts traveling. The start of travel is notified to the torque calculation unit 151 from the processing unit that controls the travel of the car 101 inside the elevator control device 105. Further, this process is repeated at predetermined time intervals until the car 101 reaches the destination floor and stops. The processing unit also notifies that the car 101 is stopped.

When the torque calculation unit 151 detects the start of traveling of the car 101 (step S1001), the torque calculation unit 151 calculates the required torque by the above method (step S1002).

Next, the torque calculation unit 151 compares the calculated required torque with the torque limit value (step S1003). That is, it is determined whether or not the required torque is equal to or greater than the torque limit value.

Then, when the required torque is equal to or greater than the torque limit value (S1003; Yes), the torque limit value is set as the torque command value (step S1004).

On the other hand, when the required torque is less than the torque limit value (S1003; No), the calculated required torque is set as the torque command value (step S1005).

Then, the torque calculation unit 151 outputs the set torque command value (step S1006). In this embodiment, the output is output to the motor control unit 152 and the elevator abnormality diagnosis device 106. At this time, the torque calculation unit 151 also outputs the output from the load calculation unit 154 used for the required torque calculation to the elevator abnormality diagnosis device 106.

After that, the torque calculation unit 151 determines whether or not the car 101 has stopped (step S1007), and when it has stopped, that is, when it detects that the vehicle has stopped running (S1007; Yes), the process ends. On the other hand, in the case of traveling (S1007; No), the process returns to step S1002 and the process is repeated.

[Abnormal diagnosis processing]
Next, the flow of the abnormality diagnosis process by the elevator abnormality diagnosis device 106 will be described with reference to the flowchart of FIG. As described above, the elevator abnormality diagnosis device 106 of the present embodiment determines the presence or absence of an abnormality in the running of the car 101 based on the torque command value, and estimates the cause from the load.

The abnormality diagnosis process of the present embodiment is started when the car 101 starts running, as in the torque command value generation process. The start of travel is notified via the elevator control device 105. Further, this process is continued until the car 101 reaches the destination floor and stops, or the determination of abnormality is confirmed.

When the abnormality presence / absence determination unit 161 detects the start of traveling (step S1101), first, the detection time counting counter (hereinafter, counter) is initialized (step S1102). Here, 0 is cleared.

Next, when the abnormality presence / absence determination unit 161 receives the torque command value and the load from the elevator control device 105 (step S1103), the torque command value and the torque limit value 164a are compared (step S1104). Here, it is determined whether or not the torque command value is the torque limit value 164a or more. The torque limit value 164a is stored in the determination value storage unit 164.

If the value of the counter is less than the counter determination value 164b (S1104; No), the elevator control device 105 determines whether the abnormality presence / absence determination unit 161 has received the travel stop signal (step S1111). That is, it is determined whether or not the running stop is detected.

Here, if the traveling stop is not detected (S1111; No), the process returns to step S1103 and waits for the reception of the next torque command value and the load. On the other hand, if the traveling stop is detected (S1111; Yes), the process is terminated. It should be noted that the result of no abnormality may be output to the output unit 163 before the processing is completed.

On the other hand, as a result of comparison, if the torque command value is the torque limit value 164a or more (S1104; Yes), the counter is counted up (step S1105). The count-up amount is predetermined and stored in, for example, the determination value storage unit 164. For example, it may be configured to increment by one. Further, it may be configured to add by a predetermined time interval Δt.

Next, the abnormality presence / absence determination unit 161 determines whether or not the period in which the torque command value is the torque limit value 164a or more is the predetermined period or more during one running (step S1106). Specifically, the abnormality presence / absence determination unit 161 determines whether or not the value of the counter after the count-up is the counter determination value 164b or more. The counter determination value 164b is predetermined and stored in the determination value storage unit 164 according to the count-up amount.

Here, if the value of the counter is less than the counter determination value 164b (S1106: No), the process proceeds to step S1111. On the other hand, when the value of the counter is the counter determination value 164b or more (S1106; Yes), the abnormality presence / absence determination unit 161 determines that there is an abnormality, and the process is taken over by the abnormality cause estimation unit 162.

The abnormality cause estimation unit 162 compares the loaded load with the load determination value 164c (step S1107). That is, it is determined whether or not the load is the load determination value 164c or more. The load determination value 164c is stored in the determination value storage unit 164 in advance.

When the load is the load determination value 164c or more (S1107; Yes), the abnormality cause estimation unit 162 estimates that the abnormality cause is in an overload undetectable state (step S1108), and outputs the estimation result to the output unit 163. Output.

On the other hand, when the load is less than the load determination value 164c (S1107; No), the abnormality cause estimation unit 162 estimates that the abnormality cause is the brake drag (step S1109), and outputs the estimation result to the output unit 163. do.

The output unit 163 that has received the estimation result outputs the estimation result to the outside (step S1110), and ends the process. In the present embodiment, the output unit 163 transmits to the maintenance terminal 120 via the network 130.

When the traveling stop is detected in step S1111, it may be configured to output to the output unit 163 that there is no abnormality. In this case, the output unit 163 may output to the maintenance terminal 120 that there is no abnormality.

As described above, in the present embodiment, the torque command value applied to the motor 103 is calculated using the load, the motor current, the output of the rotary encoder, and the torque limit value previously held in the storage device. The torque calculation unit 151, the abnormality presence / absence determination unit 161 for determining the presence / absence of an abnormality in the elevator 100 using the torque command value and the torque limit value, and the abnormality presence / absence determination unit 161 when it is determined that there is an abnormality, the load is used to determine the abnormality. The abnormality cause estimation unit 162 for estimating the cause of the above is provided.

As described above, according to the present embodiment, the presence or absence of abnormality in the elevator 100 is determined by the torque command value of the motor 103. For example, when the state in which the torque command value is the torque limit value exceeds a predetermined period, it is determined that the elevator 100 has an abnormality. Then, depending on the load of the car 101 received at that time, it is determined whether the cause of the abnormality is due to the inability to detect the overload or the brake drag.

According to the present embodiment, the presence or absence of an abnormality can be determined with high accuracy by using the relationship between the torque command value, which is a value directly linked to the drive of the motor 103, and the torque limit value. Further, by using the load, it is possible to estimate whether the overload cannot be detected or the brake drag is generated for the type of abnormality. As a result, the maintenance staff can know the cause of the abnormality in advance and can efficiently perform the maintenance and inspection work.

For example, the overload undetectable state is largely due to deterioration of the anti-vibration rubber. Therefore, if it is presumed that the overload cannot be detected, the maintenance personnel may determine that the anti-vibration rubber has deteriorated, inspect the anti-vibration rubber, or consider replacing the anti-vibration rubber. If it is determined that the brake dragging is abnormal, the brake may be readjusted.

As described above, according to the present embodiment, it is possible to notify the maintenance personnel of the specific inspection points that are likely to be the cause of the abnormality. Therefore, the efficiency of maintenance work can be further improved, and the on-site workability is also improved.

<< Second Embodiment >>
Next, a second embodiment of the present invention will be described. In the first embodiment, it is estimated that either the overload undetectable state or the occurrence of brake drag occurs as the cause of the abnormality of the elevator 100. In the present embodiment, an abnormality of the end-floor deceleration detection switch 112 is also estimated as the cause of the abnormality.

The elevator 100 of this embodiment is basically the same as that of the first embodiment. Hereinafter, this embodiment will be described with a focus on a configuration different from that of the first embodiment.

The configuration of the elevator 100 of this embodiment is basically the same as that of the first embodiment described with reference to FIGS. 1 and 2. However, in the present embodiment, as described above, an abnormality of the end-floor deceleration detection switch 112 is also estimated as a cause of the abnormality. Therefore, in the present embodiment, the end-floor deceleration detection unit 156 and the end-floor deceleration detection switch 112 are indispensable configurations.

Further, when the torque calculation unit 151 of the present embodiment notifies the elevator abnormality diagnosis device 106 of the torque command value, the end floor deceleration signal is also transmitted together with the load when the end floor deceleration signal is received.

Further, when the abnormality cause estimation unit 162 determines that there is an abnormality, the abnormality cause estimation unit 162 determines whether or not the end floor deceleration signal is received together with the torque command value used for the determination. Then, when the end-floor deceleration signal is received, it is determined that the end-floor deceleration is in progress, and it is estimated that the end-floor deceleration detection switch 112 is abnormal, that is, the end-floor deceleration detection switch is abnormal (hereinafter, also simply referred to as a switch abnormality). do.

If the mounting position of the end-floor deceleration detection switch 112 is installed on the end-floor side of the regular mounting position, or if the car 101 is not decelerated correctly due to a malfunction of the end-floor deceleration detection switch 112, the car 101 It is necessary to forcibly slow down in order to land safely. In such a case, the torque command value may reach the torque limit value.

In the present embodiment, during deceleration of the end floor, that is, after the car 101 has passed the position of the end floor deceleration detection switch 112 installed in front of the top floor when ascending, and before the bottom floor when the car 101 descends. If the torque command value reaches the torque limit value for a predetermined period or longer after passing through the position of the end floor deceleration detection switch 112 installed in the above, it is estimated that the end floor deceleration detection switch 112 is abnormal.

When the maintenance personnel are notified of such an abnormality, the maintenance personnel inspect the mounting position of the end floor deceleration detection switch 112.

[Abnormal diagnosis processing]
The flow of the abnormality diagnosis process by the elevator abnormality diagnosis device 106 of the present embodiment will be described with reference to the flowchart of FIG. Hereinafter, in the description of this process as well, the points different from those of the first embodiment will be mainly described.

Similar to the abnormality diagnosis process of the first embodiment, the abnormality presence / absence determination unit 161 performs the processes from steps S1101 to S1106 until the traveling stop is detected (step S1111), and determines the presence / absence of an abnormality. Then, in step S1106, when the counter value is the counter determination value 164b or more (S1106; Yes), the abnormality presence / absence determination unit 161 determines that there is an abnormality, and the process is taken over by the abnormality cause estimation unit 162.

In the present embodiment, the abnormality cause estimation unit 162 determines whether or not the end-floor deceleration is in progress prior to the comparison between the load and the load determination value 164c (step S2101). As described above, the determination is made based on whether or not the end-floor deceleration signal is received.

Then, when it is determined that the end floor is decelerating (S2101; Yes), the cause of the abnormality is estimated to be a switch abnormality (step S2102), the estimation result is output to the output unit 163, and the process proceeds to step S1110.

On the other hand, if the end floor is not decelerating (S2101; No), the process proceeds to step S1107 and the process is continued.

As described above, the present embodiment further includes an end-floor deceleration detection unit in the first embodiment. Therefore, as in the first embodiment, the presence or absence of a running abnormality of the elevator 100 is determined by the torque command value of the motor 103, and the cause is estimated. Therefore, as in the first embodiment, it is possible to determine with high accuracy whether or not an abnormality has occurred.

Furthermore, whether or not the end floor is being detected, and by using it as the load, the type of abnormality is whether the end floor deceleration detection switch 112 is abnormal, the overload cannot be detected, or the brake is dragged. Can be estimated. As a result, the maintenance staff can know the cause of the abnormality in advance and can efficiently perform the maintenance and inspection work.

As described above, according to the present embodiment, when it is presumed that the end-floor deceleration detection switch 112 is abnormal, the maintenance personnel prepares for the position adjustment, replacement, etc. of the end-floor deceleration switch in advance, and heads for maintenance. Can be done. That is, according to the present embodiment, as in the first embodiment, the maintenance personnel can be notified of specific inspection points that are likely to be the cause of the abnormality. Therefore, the efficiency of maintenance work can be further improved. It also improves on-site workability.

<Modification example>
In each of the above embodiments, the presence or absence of an abnormality is determined, and if there is an abnormality, the cause is estimated and the estimation result is output to the outside via the output unit 163. However, the output is not limited to this. For example, the abnormality presence / absence determination unit 161 may determine the presence / absence of an abnormality, and the result may be output to the outside via the output unit 163 prior to the output of the cause. At this time, the output may be performed only when it is determined that there is an abnormality.

<Modification example>
In each of the above embodiments, the presence or absence of a running abnormality in the car 101 is determined based on whether or not the torque command value is the torque limit value for a predetermined period. However, the threshold value used for determining the presence or absence of an abnormality is not limited to this.

For example, as shown in FIG. 9, the value between the maximum value (steady maximum value) 223 of the torque command value during steady running and the torque limit value 230 is set to the threshold value (torque threshold value) 231 for determining the presence or absence of an abnormality. It may be used as. By setting the torque threshold value 231 to a predetermined value between the steady maximum value 223 and the torque limit value 230, a sign of abnormality occurrence can be obtained.

That is, if a state in which the torque threshold value 231 is exceeded continuously or intermittently occurs during one running and the cumulative period is longer than the period determined by the predetermined counter determination value, it is a sign of a running abnormality. Judge that there is. Then, after that, as in the above embodiment, the cause of the abnormality sign is determined.

A sign can be determined at various levels according to the set value of the torque threshold value 231. That is, by setting the torque threshold value 231 to a value closer to the steady maximum value 223, the sign of failure can be detected earlier. On the other hand, by setting the torque threshold value 231 to a value closer to the torque limit value 230, unnecessary warnings can be reduced.

Further, a plurality of values may be used for the discrimination. For example, the discrimination based on the torque threshold value 231 set as a value between the steady maximum value 223 and the torque limit value 230 may be combined with the discrimination based on the torque limit value 230.

In this case, for example, a counter is provided for each of a plurality of threshold values used for discrimination. Then, from a smaller threshold value, each counter is counted up by comparing with the torque command value. Then, when the determination value is exceeded for each counter, the cause is estimated. However, if the threshold value is other than the torque limit value, the cause is estimated and output, and then the determination for the threshold value larger than the threshold value is continued.

Further, in this case, when notifying the maintenance personnel, the notification is made in such a manner as to be able to determine which threshold value the torque command value exceeds.

The present invention is not limited to the above-described embodiment, and various other application examples and modifications can be taken as long as they do not deviate from the gist of the present invention described in the claims. In addition, the control lines and information lines indicate what is considered necessary for explanation, and do not necessarily indicate all the control lines and information lines in the product. In practice, it can be considered that almost all configurations are interconnected.

100: Elevator, 101: Car, 102: Load detection sensor, 103: Motor, 104: Rotary encoder, 105: Elevator control device, 106: Elevator abnormality diagnosis device, 107: Control panel, 108: Sheave, 109: Brake Equipment, 110: balance weight, 111: main rope, 112: end floor deceleration detection switch, 113: current detector, 114: hoistway, 120: maintenance terminal, 130: network,
151: Torque calculation unit, 152: Motor control unit, 153: Storage unit, 154: Load calculation unit, 155: Position speed calculation unit, 156: End-floor deceleration detection unit, 161: Abnormality determination unit, 162: Abnormality cause estimation Unit, 163: Output unit, 164: Judgment value storage unit, 164a: Torque limit value, 164b: Counter judgment value, 164c: Load judgment value,
171: CPU, 172: Memory, 173: Storage device, 174: Communication I / F, 175: Input / output I / F,
210: Speed, 211: Accelerated running, 212: Steady running, 213: Decelerated running, 220: Torque command value, 221: Torque command value, 223: Steady maximum value, 230: Torque limit value, 231: Torque threshold

Claims (6)

A motor that drives a sheave around which a main rope is wound with a car on one end and a balance weight on the other end.
A load detection device that detects the load of the car, and
A current detector that detects the motor current, which is the current flowing through the motor,
With rotary encoders
An elevator including a position speed detecting device for detecting the speed and position of the car based on the output pulse of the rotary encoder.
A torque for calculating a torque command value, which is a torque to be applied to the motor, using the load, the motor current, the position and speed of the car, and the torque limit value previously held in the storage device. The calculation unit and
An abnormality presence / absence determination unit that determines the presence / absence of an abnormality in the elevator using the torque command value and a torque threshold value held in advance,
When the abnormality presence / absence determination unit determines that there is an abnormality, the abnormality cause estimation unit that estimates the cause of the abnormality that is the cause of the abnormality by using the load and the load determination value previously held in the storage device, and the abnormality cause estimation unit.
An output unit that outputs the abnormality cause estimated by the abnormality cause estimation unit is provided .
The abnormality presence / absence determination unit determines that there is an abnormality when the torque command value is equal to or greater than the torque threshold value for a predetermined period or longer in one running of the car.
The abnormality cause estimation unit compares the load with the load determination value, and if the load is equal to or greater than the load determination value, estimates the cause of the abnormality as an overload undetectable state, and the load is increased. An elevator characterized in that if it is less than the load determination value, the cause of the abnormality is presumed to be a brake drag, which is an abnormality of the brake device that restrains the drive of the rope wheel . The elevator according to claim 1 .
Further equipped with an end-floor deceleration detection device for detecting that the car is decelerating on the end-floor.
Prior to the comparison between the load and the load determination value, the abnormality cause estimation unit determines whether or not the end-floor deceleration detection device has detected that the car is decelerating the end-floor. An elevator characterized in that when it is detected that the end-floor deceleration is in progress, the cause of the abnormality is presumed to be an abnormality of the end-floor deceleration detection switch included in the end-floor deceleration detection device. The elevator according to claim 1 or 2 .
An elevator characterized in that the torque threshold value used by the abnormality presence / absence determination unit is the torque limit value. The elevator according to claim 1 or 2 .
An elevator characterized in that the torque threshold value used by the abnormality presence / absence determining unit is a value equal to or more than the maximum value of the torque command value during steady running and less than the torque limit value. The elevator according to any one of claims 1 to 4 and
An elevator maintenance / inspection system including a maintenance terminal capable of communicating with the elevator.
The output destination of the output unit is the maintenance terminal.
When the maintenance terminal receives the cause of the abnormality, the maintenance terminal displays the cause of the abnormality on a display device. A motor that drives a sheave around which a main rope is wound with a car on one end and a balance weight on the other end.
A load detection device that detects the load of the car, and
A current detector that detects the motor current, which is the current flowing through the motor,
With rotary encoders
A position / speed detection device that detects the speed and position of the car based on the output pulse of the rotary encoder.
A torque that calculates a torque command value, which is a torque to be applied to the motor, using the load, the motor current, the position and speed of the car, and the torque limit value previously held in the storage device. An elevator abnormality diagnosis device that diagnoses an abnormality in an elevator equipped with a calculation unit.
An abnormality presence / absence determination unit that determines the presence / absence of an abnormality in the elevator using the torque command value and a torque threshold value held in advance.
When the abnormality presence / absence determination unit determines that there is an abnormality, the abnormality cause estimation unit that estimates the cause of the abnormality that is the cause of the abnormality by using the load and the load determination value held in advance, and the abnormality cause estimation unit.
An output unit that outputs the abnormality cause specified by the abnormality cause estimation unit is provided .
The abnormality presence / absence determination unit determines that there is an abnormality when the torque command value is equal to or greater than the torque threshold value for a predetermined period or longer in one running of the car.
The abnormality cause estimation unit compares the load with the load determination value, and if the load is equal to or greater than the load determination value, estimates the cause of the abnormality as an overload undetectable state, and the load is increased. If the load is less than the determination value, the elevator abnormality diagnostic device is characterized in that the cause of the abnormality is estimated to be a brake drag, which is an abnormality of the brake device that restrains the drive of the rope wheel .

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