JP6049902B2 - Elevator diagnostic equipment - Google Patents

Description

  The present invention relates to an elevator diagnostic apparatus for diagnosing deterioration of an elevator rope.

  Wire ropes used in elevators are constructed by twisting multiple steel wires (hereinafter referred to as “element wires”), and due to deterioration over time, such as fatigue and wear associated with the use of elevators, wire ropes are used. The wire forming the wire may become thin, leading to a decrease in the diameter of the wire rope or breakage of the wire. On the other hand, in periodic inspections by elevator maintenance personnel, it has been confirmed that the orthogonality of the wire rope is not less than a predetermined value and that the number of broken wires is not more than a predetermined number. When a defect is found in these periodic inspections, it is determined that the wire rope has exceeded its life and is replaced.

  In contrast, conventional elevator diagnostic devices detect wire rope breaks in order to reduce maintenance work and to easily grasp whether wire rope damage is minor or severe. A wire breakage detection unit is provided, and the damage level of the wire rope is detected based on the level calculated from the correlation between the output of the strand breakage detection unit and the number of outputs exceeding the threshold value. (For example, see Patent Document 1)

JP 2009-249117 A

  However, there is a problem that it is difficult to detect the damage of the wire rope until the wire breakage of the rope is noticeable, and it is difficult to detect the rope deterioration at an early stage.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide an elevator diagnostic apparatus that detects an abnormality associated with deterioration of an elevator rope with high accuracy and early detects the rope deterioration. .

Elevator diagnostic apparatus according to the present invention, the rope in an elevator diagnostic apparatus for diagnosing the deterioration of the rope is the car is suspended, a position sensor for detecting the position of the suspended car on the ropes, the output of the position sensor The car natural frequency calculation means for determining the car natural frequency for vibration of the car suspended in the car and the car generating the vibration pattern for vibrating the car at the car natural frequency for vibration A vibration pattern generating means, a vibration device that vibrates the car so that the car suspended on the rope based on the output of the car vibration pattern generating means swings in the vertical direction, and the vibration device a vibration sensor for detecting the vibration of the suspended car to the rope, and your natural frequency estimation means or to estimate the car the natural frequency from the output of the vibration sensor, the car the natural frequency In which and an abnormality judging means for detecting an abnormality by comparing the estimated squirrel natural frequency and the car eigenfrequency reference value by a constant means.

  According to the present invention, the position sensor for detecting the position of the car, the vibration car natural frequency calculating means for obtaining the vibration car natural frequency from the output of the position sensor, and the vibration car natural frequency A car vibration pattern generating means for generating a vibration pattern for vibrating the car, a vibration device for vibrating the car based on the output of the car vibration pattern generating means, and a vibration apparatus A vibration sensor for detecting the vibration of the car, a car natural frequency estimating means for estimating the car natural frequency from the output of the vibration sensor, a car natural frequency and a car natural frequency estimated by the car natural frequency estimating means. Since the abnormality determining means for detecting an abnormality by comparing with a reference value is provided, an abnormality accompanying the deterioration of the elevator rope can be detected with high accuracy, and the rope deterioration can be detected at an early stage.

It is a block diagram of the elevator system provided with the elevator diagnostic apparatus by Embodiment 1 of this invention. It is a block diagram of the elevator diagnostic apparatus by Embodiment 1 of this invention. It is a flowchart which shows the process of the elevator diagnostic apparatus by Embodiment 1 of this invention. It is a figure which shows the example of the vibration pattern in the elevator diagnostic apparatus by Embodiment 1 of this invention. It is a figure which shows the example of the natural frequency estimation result in the elevator diagnostic apparatus by Embodiment 1 of this invention. It is an example of a diagnostic result at the time of making into an elevator natural frequency the whole primary natural vibration used for a rope deterioration diagnosis in the elevator diagnostic apparatus by Embodiment 1 of this invention. It is an example of a diagnostic result in case the car side primary natural vibration is made into the car natural frequency used for rope deterioration diagnosis in the elevator diagnostic apparatus according to Embodiment 1 of the present invention. It is a figure which shows the example which has degraded only a part of rope in the elevator diagnostic apparatus by Embodiment 1 of this invention. It is an example of a diagnostic result in case the car side primary natural vibration is made into the car natural frequency used for rope deterioration diagnosis in the elevator diagnostic apparatus according to Embodiment 1 of the present invention. It is a flowchart which shows the process which memorize | stores a reference value in the elevator diagnostic apparatus by Embodiment 1 of this invention. It is an example of a diagnostic result at the time of memorize | storing a reference value in the elevator diagnostic apparatus by Embodiment 1 of this invention. It is a figure which shows the time response example of the current sensor in the elevator diagnostic apparatus by Embodiment 1 of this invention. It is a block diagram of the elevator system provided with the elevator diagnostic apparatus by Embodiment 1 of this invention. It is a block diagram of the elevator system provided with the elevator diagnostic apparatus by Embodiment 2 of this invention. It is a block diagram of the elevator diagnostic apparatus by Embodiment 2 of this invention. It is a flowchart which shows the process of the elevator diagnostic apparatus by Embodiment 2 of this invention. It is a figure which shows the example of the running pattern in the elevator diagnostic apparatus by Embodiment 2 of this invention. It is a figure which shows the example of the car acceleration detected in the elevator diagnostic apparatus by Embodiment 2 of this invention. It is a block diagram of the elevator diagnostic apparatus by Embodiment 2 of this invention.

Embodiment 1
FIG. 1 shows an example of an elevator system including an elevator diagnostic apparatus according to Embodiment 1 of the present invention. In the elevator system equipped with the elevator diagnostic apparatus according to Embodiment 1 of the present invention, the hoisting machine 1 is installed at the upper part of the elevator hoistway, and at both ends of the hoisting rope 2 wound around the hoisting machine 1, In each case, a car 3 and a counterweight 4 are suspended. The hoisting rope 2 and the car 3 are connected via a shackle spring 5, and the hoisting rope 2 and the counterweight 4 are connected by a shackle spring 6. The hoisting machine 1 is driven by driving means 12 in the control panel 7. The hoisting machine 1 is based on information on the current sensor 13 that detects the current input to the driving means 12 and information on the position sensor 11 that is installed in the hoisting machine 1 and detects the position of the car 3. Raise and lower the car 3. The scale device 8 measures the weight of the car 3 including passengers. The elevator diagnostic apparatus 20 is installed, for example, at the upper part of the elevator travel path.

  FIG. 2 shows an example of the elevator diagnostic apparatus 20 according to Embodiment 1 of the present invention. The elevator diagnosis apparatus 20 according to the first embodiment of the present invention includes an excitation car natural frequency calculation means 21, a car vibration pattern generation means 22, a car natural frequency estimation means 23, a storage means 24, and an abnormality determination means 25. I have. When the abnormality determination unit 25 determines that the condition is “abnormal”, the signal is output to the notification unit 26, and the notification unit 26 notifies the “abnormality” by turning on a warning lamp or by voice notification.

  FIG. 3 is a flowchart showing processing of the elevator diagnostic apparatus according to Embodiment 1 of the present invention. In step S <b> 1, it is confirmed from the output of the scale device 8 that there is no passenger in the car 3. In step S2, a signal is output to the driving means 12, and the car 3 is moved to a predetermined position for performing elevator diagnosis. In step S3, the position of the car 3 is acquired from the position sensor 11, the car natural frequency for vibration corresponding to the position of the car 3 is calculated by the car natural frequency calculating means 21 for vibration, and the result is calculated. It outputs to the vibration pattern generation means 22. In step S4, the car vibration pattern generation means 22 generates a car vibration pattern from the inputted information on the vibration car natural frequency and operates the hoisting machine 1 through the driving means 12 to thereby move the car 3 Vibrates.

  FIG. 4 shows an example of the car vibration pattern. In FIG. 4, the time change of the rotational speed of the hoisting machine 1 is shown. Therefore, when the car 3 is vibrated by this car vibration pattern, the car 3 is shaken in the vertical direction. In addition, the car vibration pattern shown in FIG. 4 is a vibration in which the car 3 is vibrated for a predetermined time t1 with a sine wave of the vibration car natural frequency output from the vibration car natural frequency calculation means 21. The vibration pattern is combined with a zero speed pattern that holds the car 3 at zero speed.

  As shown in FIG. 4, after the car 3 is shaken by the vibration pattern until a predetermined time t1, when the movement of the hoist 1 is suppressed by the zero speed pattern, the car 3 whose vibration is excited by the vibration pattern is obtained. In order to continue to swing in the vertical direction, the hoisting machine 1 receives a disturbance of the natural frequency. At this time, the hoist 1 tries to follow the zero speed pattern, and thus exhibits a current response that cancels the disturbance. This current response is detected by the current sensor 13 and transmitted to the car natural frequency estimating means 23.

  In step S5, the car natural frequency estimating means 23 estimates the car natural frequency from the output of the car vibration pattern generating means 22 and the output of the current sensor 13. Specifically, the timing of the zero speed pattern of FIG. 4 in step S4 is acquired from the output of the car vibration pattern generation means 22, and the output of the current sensor 13 at this time is acquired. FIG. 5 shows the result of frequency analysis of the output of the current sensor 13 at this time. The car natural frequency estimating means 23 outputs the frequency fr having the largest gain as a result of the frequency analysis to the storage means 24 and the abnormality determining means 25 as the “estimated value” of the car natural frequency.

  In step S6, the abnormality determination means 25 compares the estimated value of the car natural frequency with a reference value. First, the storage means 24 stores a “reference value” that is a car natural frequency when the elevator rope is in a normal state at each stop position of the car 3. The method for creating the reference value will be described in detail later. In step S 6, the “reference value” of the natural frequency at the stop position of the car 3 corresponding to the position information from the position sensor 11 and the “estimated value” of the natural frequency that is the output of the car natural frequency estimating means 23. And calculate the difference.

  In step S7, when the difference calculated in step S6 exceeds a predetermined value, it is determined that “the rope has deteriorated”, and in step S10, the reporting unit 26 reports an abnormality and ends the diagnosis.

  When the difference calculated in step S6 does not exceed the predetermined value, it is determined that “the rope has not deteriorated”. At this time, in step S8, it is confirmed whether or not the diagnosis has been performed at all the stop positions of the car 3. If the diagnosis has not been completed, the car 3 is moved to a position where the diagnosis has not been performed in step S9. Then, the processes from step S3 to step S7 are performed. In step S8, when it is confirmed that the diagnosis has been performed at all the stop positions of the car 3, the diagnosis is terminated.

  Next, a method for calculating the car natural frequency for vibration according to the position of the car 3 in the car natural frequency calculating means 21 for vibration will be described. When the configuration of the elevator system is as shown in FIG. 1 and the car 3 and the counterweight 4 are likely to swing in the vertical direction, the car natural frequency (hereinafter referred to as the overall primary natural frequency) is as follows. It can be expressed by a formula.

Here, f _a is the overall primary natural frequency, and k is the rope stiffness. m is an equivalent mass, and can be obtained by the following equation, where m ₁ is the mass of the car 3 and m ₂ is the mass of the counterweight 4.

The rope stiffness k in equation (1) is determined by the total length of the rope on the side of the car 3 and the counterweight 4 and the shackle spring 5 and the shackle spring connected to the side of the car 3 and the side of the counterweight 4 respectively. A stiffness of 6 is given as an equivalent spring stiffness connected in series. In this way, the car is excited with the overall primary natural frequency f _a calculated by the expressions (1) and (2) as the car natural frequency for vibration.

FIG. 6 shows reference values and estimated values of the overall primary natural frequency with respect to the stop position of the car 3. In FIG. 6, the value of the entire primary natural frequency stored in the storage unit 24 is indicated as “reference value: f _a1 ”. This reference value is the same as the car natural frequency for excitation, which is the overall primary natural frequency f _a calculated by the equations (1) and (2). The value is almost constant regardless of the position.

Further, in FIG. 6, an example of an “estimated value” of the car natural frequency that is the output of the car natural frequency estimating means 23 is shown as “estimated value: f _a2 ”. For example, when the cross-sectional area of the rope decreases due to wear or the like, the rope stiffness decreases. As a result, the estimated value of the car natural frequency which is the output of the car natural frequency estimating means 23 is lowered. In the example shown in FIG. 6, when the “estimated value” of the car natural frequency, which is the output of the car natural frequency estimating means 23, decreases and the car 3 is on the third floor, the “estimated value” is “reference value”. ”By“ natural frequency difference ”. In step S6 in FIG. 3, the “natural frequency difference” in FIG. 6 is obtained for each floor. In step S7 in FIG. 3, when the “natural frequency difference” exceeds a predetermined value, it is determined that the rope has deteriorated beyond a predetermined level, and an abnormality is reported.

  Regarding the determination of the deterioration of the rope, it was determined that the rope had deteriorated even when one natural frequency difference at each stop position of the car 3 exceeded the predetermined value. What kind of processing is used to compare the natural frequency difference with the predetermined value, such as comparing with a predetermined value different for each position, or comparing the average value of the natural frequency difference of all stop positions with the predetermined value? But it doesn't matter.

  Further, when the elevator system has a configuration as shown in FIG. 1 and the car 3 is likely to swing in the vertical direction when the hoisting machine 1 is a fixed point, the car natural frequency (hereinafter referred to as car side 1) Is called the next natural frequency).

Here, f _b is the car-side primary natural frequency. k ₁ is the car-side rope rigidity, and the rigidity determined by the entire rope length on the car 3 side and the rigidity of the shackle spring 5 connected to the car 3 side are given as equivalent spring rigidity connected in series. In this way, car vibration is performed using the car-side primary natural frequency f _b calculated by the equation (3) as the car natural frequency for vibration.

FIG. 7 shows reference values and estimated values of the car-side primary natural frequency with respect to the stop position of the car 3. In FIG. 7, the value of the car-side primary natural frequency stored in the storage unit 24 is indicated as “reference value: f _b1 ”. This reference value is the same as the car natural frequency f _b which is the car-side primary natural frequency f _b calculated by the expression (3), and the mass m ₁ of the car 3 is related to the position of the car 3. Although it is constant, the rope length on the side of the car 3 becomes shorter as the car 3 rises from the lowest floor, so that the car-side rope rigidity k ₁ increases. As a result, when the position of the car 3 rises as shown in FIG. 7, the reference value f _{b1 of} the car-side primary natural frequency increases.

In FIG. 7, an example of an “estimated value” of the car natural frequency that is the output of the car natural frequency estimating means 23 is shown as “estimated value: f _b2 ”. For example, when the cross-sectional area of the rope decreases due to wear or the like, the rope stiffness decreases. As a result, the estimated value of the car natural frequency which is the output of the car natural frequency estimating means 23 is lowered. In the example shown in FIG. 7, when the “estimated value” of the car natural frequency, which is the output of the car natural frequency estimating means 23, decreases on all floors, and the car 3 is on the fourth floor, the “estimated value” Is lower than the “reference value” by the “natural frequency difference”. In step S6 in FIG. 3, the “natural frequency difference” in FIG. 7 is obtained for each floor. In step S7 in FIG. 3, when the “natural frequency difference” exceeds a predetermined value, it is determined that the rope has deteriorated beyond a predetermined level, and an abnormality is reported. As described above, the car natural frequency used for the rope deterioration diagnosis may be the entire primary natural frequency or the car-side primary natural frequency.

  FIG. 8 shows an example in which only one part of the rope has deteriorated. In FIG. 8, the hoisting machine 1, the rope 2, the car 3, the counterweight 4, the shackle spring 5, and the shackle spring 6 are the same as the example shown in FIG. 1. In FIG. 8, the rope degradation part 100 is a part of the rope 2, and is a part where the rope stiffness is lowered due to aging degradation. FIG. 8A shows a state in which the car 3 is stopped on the first floor, and FIG. 8B shows a state in which the car 3 is stopped on the fourth floor. When the first floor is stopped as shown in FIG. 8A, the rope deterioration portion 100 is on the car 3 side, but when the fourth floor is stopped as shown in FIG. Has moved to the side.

  Thus, when the rope degradation part 100 is a part of the rope 2 and moves from the side of the car 3 to the side of the counterweight 4 as the car 3 moves, the car 3 side when stopping on the first floor As the rope stiffness of the car decreases, the "estimated value" of the car-side primary natural frequency drops, but when the car stops on the fourth floor, there is no change in the rope rigidity of the car 3 side. The “estimated value” is the same as the “reference value”.

FIG. 9 shows reference values and estimated values of the car-side primary natural frequency with respect to the stop position of the car 3 in the example shown in FIG. In FIG. 9, the reference value is shown as f _c 1 and the estimated value is shown as f _c 2. In FIG. 9, in the lower floors such as the first floor and the second floor, the difference between the estimated value and the reference value is determined to be “deteriorated”. Since the difference is small at the floor, it is determined that there is no deterioration.

  Thus, the value of the “natural frequency difference” for each stop position of the car 3 varies depending on the length, number, and position of the rope degradation portion 100. Therefore, the abnormality determination means 25 may determine that there is an abnormality when there are one or more locations where the “natural frequency difference” exceeds a predetermined value at a plurality of car positions to be diagnosed. You may determine abnormality using the tendency of the difference with the reference value in a cage position.

  The elevator operation after judging the abnormality and reporting the abnormality may be immediately stopped according to the degree of abnormality, or the car position where the `` natural frequency difference '' exceeds the predetermined value is set as the rope deterioration range Then, the operation may be performed such that the position of the car 3 whose difference from the reference value is within a predetermined value range is set as the rope normal range, and the elevator travel range after the abnormality determination is limited to the rope normal range. In the example of FIG. 9, the 1st to 3rd floors are rope degradation ranges, limited to traveling from the 4th to 5th floors, and bending ropes are not subject to bending fatigue due to sheaves such as hoisting machines. The service may be continued for operation. Here, an example has been described in which the car natural frequency for excitation is calculated using a predetermined formula in accordance with the position of the car. However, the reference value stored in the storage unit 24 is determined according to the position of the car. It may be used as the natural frequency of the car for vibration.

  Next, the procedure for storing the “reference value” for diagnosing deterioration in the elevator diagnostic apparatus according to Embodiment 1 of the present invention in the storage means 24 will be described with reference to the flowchart of FIG. The procedure for memorizing the “reference value” is basically the same as the procedure for diagnostic processing, but it is confirmed that the elevator rope is normal, for example, immediately after installation of the elevator or inspection by a specialist engineer. Immediately after that, the “reference value” is stored.

  In step S21, it is confirmed from the output of the scale device 8 that there are no passengers in the car 3. In step S22, a signal is output to the driving means 12, and the car 3 is moved to a predetermined position for storing the reference value. In step S23, the position of the car 3 is acquired from the position sensor 11, and the car natural frequency calculating means 21 is used to calculate the car natural frequency for vibration from the output of the position sensor 11, and the result is the car vibration. Output to the pattern generation means 22. In step S24, the car vibration pattern generation means 22 generates a car vibration pattern from the input information on the natural frequency of the car for vibration and operates the hoisting machine 1 through the driving means 12 to thereby move the car 3 Vibrates.

  The car vibration pattern generated by the car vibration pattern generation means 22 is, for example, as shown in FIG. In step S25, the car natural frequency estimating means 23 estimates the car natural frequency from the output of the car excitation pattern generating means 22 and the output of the current sensor 13. Specifically, the timing of the zero speed pattern of FIG. 4 in step S24 is acquired from the output of the car vibration pattern generation means 22, and the output of the current sensor 13 at this time is acquired. FIG. 5 shows the result of frequency analysis of the output of the current sensor 13 at this time. The car natural frequency estimation means 23 obtains the frequency fr having the largest gain as the result of the frequency analysis and the “reference value of the car natural frequency. "Is output. In step S <b> 26, the position information that is the output of the position sensor 11 and the “reference value” that is the output of the car natural frequency estimating means 23 are stored in the storage means 24.

  In step 27, it is confirmed whether or not the “reference value” has been stored at all the stop positions of the car 3. If the execution has not been completed, the process proceeds to a position in which “reference value” is not stored in step S28. After moving the car 3, steps S23 to S27 are performed. If it is confirmed in step S27 that the “reference value” has been stored at all the stop positions of the car 3, the storage operation of the “reference value” is terminated.

  FIG. 11 shows the “calculated value” that is the output of the car natural frequency calculating means 21 for excitation and the output of the car natural frequency estimating means 23 in the “reference value” storing procedure shown in FIG. An example of the “reference value” is shown. As shown in FIG. 11, the “calculated value” and the “reference value” may be different.

  In the process according to the flowchart for deterioration diagnosis shown in FIG. 3 and the process according to the flowchart for storing reference values shown in FIG. Although an example in which a frequency having a large gain is selected has been described, any method may be used as long as the natural frequency of the car is estimated without being limited thereto. For example, FIG. 12 shows an example of the output of the current sensor 13. As an operation of the car natural frequency estimating means 23, for example, a plurality of output peaks of the current sensor 13 shown in FIG. 12 are extracted, and average values of reciprocals of peak feeling times ta, tb, tc, and td are obtained. This may be used as the output of the car natural frequency estimating means 23.

  As described above, by using the elevator system including the elevator diagnostic apparatus shown in the first embodiment, the diameter of the rope is reduced when the steel wire constituting the rope is thinned or the strand of the rope is broken. For example, when the rope stiffness decreases, a decrease in the rope stiffness can be detected. Further, by detecting the rope deterioration for each stop position of the car 3, the rope deterioration position can be specified. Furthermore, by detecting the vibration of the car 3 by the hoisting machine 1 and estimating the natural frequency of the car from the excited vibration, it is possible to detect aged deterioration of the elevator rope that is difficult to detect in normal traveling of the elevator. Can do.

  Moreover, the position sensor 11, the drive means 12, the current sensor 13, and the scale device 8 are already provided in the conventional elevator apparatus. In the elevator diagnostic apparatus shown in FIG. It is possible to detect a decrease in rope stiffness.

  In the first embodiment, an explanation is given for an elevator with a roping of 1: 1 as shown in FIG. 1, but it is also applicable to an elevator with a roping of 2: 1 as shown in FIG. Can do. In the first embodiment, the car-side primary natural frequency determined by the equivalent spring stiffness of the car-side rope and the shackle spring 5 and the mass of the car 3 is described as an example using the formula (3). Instead of 3), the primary natural frequency of the counterweight side, which is determined by the mass of the counterweight 4 and the equivalent spring stiffness of the counterweight-side rope and shackle spring 6, which exists symmetrically with the hoisting machine 1, The car natural frequency may be used for deterioration diagnosis.

  In the first embodiment, the combination of the driving means 12 and the hoisting machine 1 is shown as the vibration device. However, the present invention is not limited to this, and the car 3 is operated based on a command from the car vibration pattern generation means 22. Anything that vibrates can be used. For example, the output of the car vibration pattern generation means 22 may be input to a self-vibration device that vibrates itself, and the car may be vibrated by installing the self-vibration device in the car 3. The self-vibration device may be brought into the car 3 at the time of elevator diagnosis or may be permanently installed in the car 3.

  Further, in the first embodiment, the current sensor 13 is shown as a vibration sensor for detecting the vibration of the car. However, the present invention is not limited to this, and the car 3 may be detected by a physical vibration sensor installed in the car 3. Any device can be used as long as it can detect vibrations.

Embodiment 2
FIG. 14 shows an example of an elevator system provided with an elevator diagnostic apparatus according to Embodiment 2 of the present invention. Compared with FIG. 1 which is an illustration of an elevator system provided with the elevator diagnostic apparatus according to the first embodiment of the present invention, FIG. 14 is changed to the elevator diagnostic apparatus 30, and This is the same except that a physical vibration sensor 40 for detecting vibration is added.

  FIG. 15 shows an example of the elevator diagnostic apparatus 30 according to the second embodiment of the present invention. The elevator diagnosis apparatus 30 according to the second embodiment of the present invention includes an emergency stop pattern generation unit 31, a car natural frequency estimation unit 23, a storage unit 24, and an abnormality determination unit 25. When the abnormality determination unit 25 determines that the condition is “abnormal”, the signal is output to the notification unit 26, and the notification unit 26 notifies the “abnormality” by turning on a warning lamp or by voice notification.

  FIG. 16 is a flowchart showing processing of the elevator diagnostic apparatus 30 according to the second embodiment of the present invention. In step S31, it is confirmed from the output of the scale device 8 that there is no passenger in the car 3. In step S32, a signal is output to the driving means 12, and the car 3 is moved to a predetermined position for performing elevator diagnosis. In step S33, a traveling instruction is output from the emergency stop pattern generating means 31 to the driving means 12, and the car 3 is driven in a traveling pattern as shown in FIG. Specifically, the emergency stop pattern generation unit 31 outputs an emergency stop pattern for performing an emergency stop operation at the predetermined position S <b> 1 to the drive unit 12 based on information from the position sensor 11. The car 3 is suddenly stopped by the emergency stop operation, and at this time, the car 3 is vibrated at a car-side primary natural frequency that is easily shaken in the vertical direction by receiving a step-like disturbance. At this time, vibration as shown in FIG. 18 is detected by the physical vibration sensor 40. In FIG. 18, t <b> 3 is the time when the emergency stop operation is performed, and the car vibration signal in the section from immediately after that to t <b> 4 after a predetermined time is output from the physical vibration sensor 40 to the car natural frequency estimating means 23. . In step 34, the car natural frequency estimating means 23 estimates the car natural frequency from the output of the physical vibration sensor 40. The specific method for estimating the car natural frequency in the car natural frequency estimating means 23 is the same as in the first embodiment. The car natural frequency which is the output of the car natural frequency estimating means 23 is output to the storage means 24 and the abnormality determining means 25 as an “estimated value” of the car natural frequency.

  Step S35 in FIG. 16 is step S6 in FIG. 3, step S36 in FIG. 16 is step S7 in FIG. 3, step S37 in FIG. 16 is step S8 in FIG. 3, and step S38 in FIG. Step S9 and step S39 in FIG. 16 are the same as step S10 in FIG.

  As described above, by using the elevator system including the elevator diagnosis apparatus shown in the second embodiment, the emergency car vibration frequency corresponding to the position of the car 3 can be calculated without calculating the vibration frequency at all positions. If the rope stiffness decreases due to a decrease in the diameter of the rope due to the steel wire constituting the rope becoming thin or the rope strand breaking, etc., simply by stopping the operation, a decrease in the rope stiffness is detected. be able to.

  In the second embodiment, the physical vibration sensor 40 is shown as the vibration sensor for detecting the vibration of the car 3 during the emergency stop operation. It doesn't matter. For example, as shown in FIG. 19, a speed governor 41 that monitors the speed of the car 3 and a speed governor encoder 42 that outputs the rotational speed of the speed governor 41 are installed. The vibration of the car 3 may be detected. Alternatively, in the elevator system as shown in FIG. 1, the vibration of the car 3 may be detected from the change in the detection result of the scale device 8 that measures the weight of the car 3. In the second embodiment, the driving means 12 is shown as the car rapid stop means. However, any means may be used as long as the car 3 is suddenly stopped based on the output of the emergency stop pattern generation means 31. .

DESCRIPTION OF SYMBOLS 11 Position sensor 12 Drive means 13 Current sensor 21 Excitation car natural frequency calculation means 22 Car excitation pattern generation means 23 Car natural frequency estimation means 25 Abnormality determination means

Claims (7)

In the elevator diagnostic device that diagnoses the deterioration of the rope on which the car is suspended,
A position sensor for detecting the position of the car suspended from the rope;
An exciting car natural frequency calculating means for obtaining an exciting car natural frequency of the car suspended from the output of the position sensor;
A car vibration pattern generating means for generating a vibration pattern for vibrating the car at the vibration car natural frequency;
A vibration device that vibrates the car so that the car suspended on the rope swings in the vertical direction based on the output of the car vibration pattern generation unit;
A vibration sensor for detecting vibration of the car suspended from the rope vibrated by the vibration device;
A car natural frequency estimating means for estimating a car natural frequency from the output of the vibration sensor;
An elevator diagnosis apparatus comprising: an abnormality determination unit that detects an abnormality by comparing the car natural frequency estimated by the car natural frequency estimation unit and a car natural frequency reference value. The vibration device is a drive circuit of a hoisting machine that winds up the rope connected to the car,
The elevator diagnostic apparatus according to claim 1, wherein the vibration sensor is a current sensor that detects a current input to the drive circuit. The vibration pattern generated in the car vibration pattern generation means is an excitation that vibrates the car with a sine wave of the vibration car natural frequency obtained by the vibration car natural frequency calculation means. The elevator diagnostic apparatus according to claim 1 or 2, wherein a pattern and a zero speed pattern for holding the car at zero speed are combined. The vibration car natural frequency is an overall primary natural frequency corresponding to the car natural frequency when the car and the counterweight suspended from both ends of the rope are likely to swing in the vertical direction. The elevator diagnostic apparatus according to any one of claims 1 to 3, wherein the elevator diagnostic apparatus is provided. The car's natural frequency for excitation corresponds to the car 's natural frequency when the car is likely to swing in the longitudinal direction when the hoist that winds the rope connected to the car is used as a fixed point. It is a side primary natural frequency. The elevator diagnostic apparatus of any one of Claim 1 to 3 characterized by the above-mentioned. In the elevator diagnostic device that diagnoses the deterioration of the rope on which the car is suspended,
A position sensor for detecting the position of the car suspended from the rope;
Emergency stop pattern generating means for generating an emergency stop pattern for performing an emergency stop operation at a predetermined position from the output of the position sensor;
Car sudden stop means for suddenly stopping the car suspended at the rope at the position based on the output of the emergency stop pattern generating means;
A vibration sensor for detecting vibrations of the car suspended on the rope after being stopped by the car sudden stop means;
A car natural frequency estimating means for estimating a car natural frequency from the output of the vibration sensor;
An abnormality determination for detecting an abnormality associated with the deterioration of the rope by comparing the car natural frequency estimated by the car natural frequency estimating means with a car natural frequency reference value when the rope is in a normal state. An elevator diagnostic apparatus comprising: means. The elevator diagnosis apparatus according to any one of claims 1 to 6, wherein the abnormality determination unit detects an abnormality by changing a plurality of positions of the car.

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