JP2018165194A - Counter weight clearance diagnosis device for elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a counter weight clearance diagnosis device for an elevator, which is capable of appropriately measuring the clearance of a counter weight even when a clearance size is large.SOLUTION: This counter weight clearance diagnosis device measures a clearance size (Lc) between a buffer 11 and a counter weight 2 by diagnostic-operating a car 1, and is provided with: a safety control device (20) that limits rising of the car on the basis of comparison of a car position with a first limit switch position (Lu1) during a normal operation, the first limit switch which is larger than a top floor level 14 being set as a rising limit value for limiting the rising of the car exceeding the top floor level; and a limit switch operation switching unit (33) that changes the rising limit value to a second limit switch position (Lu2) larger than the first limit switch position during a diagnostic operation.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an elevator counterweight clearance diagnostic apparatus for measuring an elevator counterweight clearance dimension using an electronic safety system.

  In recent years, the limit switch that restricts excessive lift or lowering of the elevator car has been replaced with electronic limit switch position data from the conventional mechanical switch, and the car can be lifted or lowered based on the governor encoder pulse. An elevator that improves reliability and maintainability by applying a restricted electronic safety system is known (see, for example, Patent Document 1).

  On the other hand, in general, in the elevator, when the length of the main rope increases due to a change over time, the clearance between the counterweight (balanced weight) and the shock absorber installed in the pit becomes short. If this clearance becomes abnormally short and disappears, the counterweight may collide with the shock absorber, resulting in emergency stop of the car, idling of the hoist, abnormal landing level, and the like. For this reason, the clearance is required to be managed accurately.

  When measuring the clearance, one expert engineer drives the car to the top floor, and another expert enters the hoistway pit to clear the clearance between the counterweight and the shock absorber. Measure. Thus, the clearance measurement operation is complicated.

  On the other hand, a conventional technique is known in which a specialist engineer automatically measures the clearance between the counterweight and the shock absorber without entering the pit (see, for example, Patent Document 2).

  In this prior art, a rotary encoder is attached to the shaft end of the rotating shaft of the drive motor, and an ammeter is provided in the power supply circuit of the drive motor. Then, the limit switch for limiting the rise is disconnected, the car is raised from the top floor, and when the contact of the counterweight with the shock absorber is determined based on the measured value of the driving current from the ammeter, the car is To stop. Then, the clearance is measured by calculating the ascending movement distance from the starting point of the top floor ascending to the stopping point of the car from the output of the rotary encoder.

International Publication No. 2011/148411 JP 2007-39240 A

  In the prior art described in Patent Document 2 described above, when the clearance size is large, the final limit switch operates to stop the operation function of the elevator, or the car rises excessively and interferes with the ceiling of the hoistway. The clearance may not be measured properly.

  Therefore, the present invention provides an elevator counterweight clearance diagnostic apparatus capable of appropriately measuring the counterweight clearance even when the clearance dimension is large.

  In order to solve the above-mentioned problems, an elevator counterweight clearance diagnosis apparatus according to the present invention performs a diagnostic operation on a car and measures a clearance dimension between a shock absorber and a counterweight, and is used during normal operation. , The first limit switch position that is larger than the top floor level is set as the rising limit value that limits the climb of the car exceeding the top floor level, and the position of the car is compared with the first limit switch position. And a limit switch operating position switching unit that changes the ascent limit value to a second limit switch position that is larger than the first limit switch position in diagnostic operation. .

  According to the present invention, even when the clearance dimension is large, the clearance of the counterweight can be appropriately measured.

  Problems, configurations, and effects other than those described above will become apparent from the following description of embodiments.

It is a block diagram of the counterweight clearance diagnostic apparatus which is one Embodiment. The driving pattern of the car during diagnostic driving is shown. The driving pattern of the car during diagnostic driving is shown. The driving pattern of the car during diagnostic driving is shown. The driving pattern of the car during diagnostic driving is shown. The driving pattern of the car during diagnostic driving is shown. It is a flowchart which shows the processing operation at the time of the clearance dimension measurement by diagnostic driving | operation. It is a flowchart which shows the processing operation after the clearance dimension measurement by diagnostic driving | operation.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a configuration diagram of an elevator counterweight clearance diagnosis apparatus according to an embodiment of the present invention.

  In FIG. 1, 1 is an elevator car, 2 is a counterweight (balanced weight), 3 is a main rope, and both ends of the main rope 3 are connected to the car 1 and the counterweight 2. Reference numeral 4 denotes an electric hoist, and 5 is an electric hoist pulley. The main rope 3 is wound around the sheave of the electric hoist 4 and the pulley 5 for the electric hoist so that the car 1 and the counterweight 2 are suspended in the hoistway. When the sheave of the electric hoist 4 is rotationally driven, the main rope 3 is frictionally driven, whereby the car 1 and the counterweight 2 are raised and lowered in the hoistway in opposite directions.

  6 is a governor (speed governor) for stopping the elevator by detecting a speed abnormality by rotating in conjunction with the raising and lowering of the car 1, and 7 is a governor for generating a pulse in proportion to the amount of rotation of the governor 6. It is an encoder, and the movement amount of the car 1 is measured by the governor encoder 7. Reference numeral 8 denotes an endless governor rope, 9 denotes a coupler between the car 1 and the governor rope 8, and 10 denotes a governor pulley.

  11 is a shock absorber installed immediately below the counterweight 2 in the pit, 12 is a counterweight contact detector which is a sensor for detecting contact between the counterweight 2 and the shock absorber 11, and 13 is a car interior of the car 1. A load detector 14 for detecting the load load is at the highest level.

  As the counterweight contact detector 12, a pressure sensitive sensor, a pressure sensor, or the like can be applied. In addition, it is not restricted to these sensors, The change of the motor current or motor torque of the electric hoist 4, the difference between the speed command for controlling the electric hoist 4 and the feedback speed, the stop of the car 1 by the governor encoder 7 The contact between the counterweight 2 and the shock absorber 11 may be detected by detection or the like.

  Reference numeral 20 denotes a safety controller CPU (Central Processing Unit) constituting an electronic safety control system. The safety controller CPU 20 detects the position of the car 1 and the amount of movement based on the pulse signal from the governor encoder 7. Detection unit 21, floor detection unit 22 that detects the floor on which the car 1 is located based on the car position data from the car position detection unit 21, and limit switch based on the car position data from the car position detection unit 21 It has a limit switch function execution unit 23 that executes the function. In the present embodiment, the safety controller CPU 20 functions as each unit (21, 22, 23) by executing a predetermined program.

  In addition, the floor detection part 22 applies a well-known technique, and the position detector mounted in the car 1 detects the shielding board provided in a hoistway, and thereby the floor where the car 1 is located is detected. It may be detected.

  Here, the limit switch function execution unit 23 uses the first ascent limit limit switch function operation position (Lu1) for normal operation, counterweight clearance diagnosis as the car position in order to limit the excessive rise of the car 1. When the second rise limit limit switch function operation position for operation (Lu2) and the final limit switch function operation position (Lf) for stopping all the operation functions and stopping the car are detected, each switch function is executed. . That is, the limit switch function execution unit 23 compares the car position detected by the car position detection unit 21 with Lu1, Lu2, and Luf, and executes each switch function based on the comparison result. This switch function is as follows.

  When the car position reaches Lu1, the brake of the electric hoist 4 is actuated (the power is not shut off), and the car 1 is stopped. At this time, only the descending direction may be permitted as the operable direction of the car 1 after stopping. When the car position reaches Lf, the brake of the electric hoisting machine 4 is activated, the power supply to the electric hoisting machine 4 is cut off, and the car 1 is stopped in an emergency. This prevents the car 1 from rising excessively and coming into contact with the hoistway ceiling. At the time of diagnosis, Lu1 is changed to Lu2, as will be described later.

  The values of Lu1, Lu2, and Lf are preset in the limit switch function execution unit 23. In the present embodiment, the values of Lu1, Lu2, and Lf are stored in a storage device such as a semiconductor memory (not shown).

  Such a safety control function of the safety controller CPU 20 is preset in the safety controller CPU 20 in advance as rise limit value data for limiting the rise of the car where the limit switch exceeds the top level 14 instead of the mechanical limit switch. This is based on Lu1, Lu2 and Lf, which is electronic safety control. Here, the limit switch function operation position Lu1 (Lu2 after the change) and Lf correspond to the limit switch position of the mechanical limit switch. Note that the safety controller CPU 20 is independent of a control device CPU described later in order to improve the reliability of safety control.

  Reference numeral 30 denotes a control device CPU that executes a series of processes related to the counterweight clearance diagnosis in the present embodiment. Control device CPU30 is provided with each part (31-39) demonstrated below. In the present embodiment, the control device CPU functions as each unit (31 to 39) by executing a predetermined program.

  The in-car load detector 31 detects the load in the car compartment of the car 1 based on the signal from the load detector 13. The control device CPU 30 controls the operation of the car 1 even during normal operation.

  The diagnostic operation command unit 32 commands a counterweight clearance diagnosis when the car load detection unit 31 detects no load, that is, the unoccupied car room is unattended during a callless pause.

  The limit switch operation position switching unit 33 changes the ascent limit position from the first ascent limit limit switch function operating position Lu1 to the second ascent limit limit switch function operating position Lu2 according to a command from the diagnostic operation command unit 32. The value of Lu2 is preset in the limit switch operation position switching unit 33, but data preset in the safety controller CPU may be used.

  The diagnostic speed switching unit 34 switches the diagnostic operation speed of the car 1 according to a command from the diagnostic operation command unit 32, a limit switch operation state from the limit switch function execution unit 23, and the like.

  The travel command unit 35 commands the electric hoist 4 to travel speed and travel stop according to the command from the diagnostic speed switching unit 34 and the limit switch operation state from the limit switch function execution unit 23.

  The counter contact detector 36 detects contact between the counterweight 2 and the shock absorber 11 based on a signal from the counterweight contact detector 12.

  Based on the detection data from the counter contact detection unit 36 and the car position data from the car position detection unit 21, the clearance dimension measurement unit 37 starts to raise the car 1 from the top floor level, and the counterweight 2 and the shock absorber The moving distance of the car 1 until it comes into contact with the car 11 is measured as the counterweight clearance dimension.

  The clearance dimension recording unit 38 records and saves the value of the counterweight clearance measured by the clearance dimension measuring unit 37.

  The abnormality diagnosis unit 39 determines whether the counterweight clearance dimension recorded in the clearance dimension recording unit 38 is within the determination reference value.

  Reference numeral 40 denotes a communication line (for example, a telephone line or the Internet), and reference numeral 41 denotes a monitoring center located at a location geographically away from the elevator installation location. If the abnormality diagnosis unit 39 determines that the counterweight clearance dimension is outside the determination reference value and detects an abnormality, the abnormality diagnosis unit 39 issues an abnormality to the monitoring center 41 via the communication line 40.

  The above-mentioned Lu1, Lu2 and Lf are respectively the distance dimension from the highest floor level 14 to the first rising limit limit switch function operation position (normal time), and the second rising limit limit switch function from the highest floor level 14. The distance dimension to the operation position (during diagnostic operation) and the distance dimension from the top floor level 14 to the final limit switch function operation position are shown. In the present embodiment, by setting Lu2 to be greater than or equal to Lu1 and less than Lf (Lu1 ≦ Lu2 <Lf), it is possible to raise the car 1 over Lu1 and perform the car 1 during diagnostic operation. Is prevented from rising excessively.

  Moreover, Lc in FIG. 1 shows a counterweight clearance dimension. Lc is based on the car position when the car 1 is stopped at the top floor level 14, and the counterweight contact detector 12 detects the contact between the counterweight 2 and the buffer 11 by performing the ascending operation at a low speed. It is measured by the moving distance of the car 1 until it is done.

  Next, the driving pattern of the car 1 during the counterweight clearance diagnosis operation will be described with reference to FIGS. Although FIGS. 2-6 differ in a driving | running pattern, all show the relationship between the moving distance of the car 1 at the time of diagnostic driving | operation, and a moving speed. In the following, “low speed” represents the driving speed of the car 1 during diagnostic operation, which is lower than the rated speed during service operation. Moreover, the magnitude | sizes of V1 and V2 in a figure are the same in each figure.

  First, FIGS. 2 to 5 each show a case where the car 1 is driven up from the top floor level during the diagnostic operation.

  In the case of FIG. 2, the car 1 has a steady traveling speed (maximum speed) when performing ascending operation from the top floor level 14 until the first ascending limit switch function operating position Lu1 (normal time). The vehicle travels at a low speed V1 (for example, 5 m / min). Further, the car 1 has a second low speed V2 (for example, 2 m / second) that is lower than the first low speed V1 at a steady running speed from Lu1 to the second ascent limit switch function operating position Lu2 (during diagnostic operation). min).

  As shown in FIG. 2, the contact between the counterweight 2 and the shock absorber 11 is detected by the counterweight contact detector 12 before Lu2, and at that time, the operation of the diagnostic device shifts to the stop process, and the counterweight A clearance dimension Lc is calculated. Thus, by switching the speed to the second low speed V2 lower than the first low speed V1, the impact at the time of contact between the counterweight 2 and the shock absorber 11 is alleviated and the diagnosis time can be shortened. .

  FIG. 3 shows a case where the car 1 rises to Lu2 without contact between the counterweight 2 and the shock absorber 11, that is, when the ascent limit switch function is in operation. Therefore, when the car 1 rises to Lu2, the operation of the diagnostic device shifts to a stop process. In this case, it is determined that Lc is equal to or greater than Lu2.

  FIG. 4 shows a case where the counterweight 2 and the shock absorber 11 are in contact before Lu1. In this case, even before the Lu1, the operation of the diagnostic device shifts to a stop process when the contact between the counterweight 2 and the shock absorber 11 is detected, and the counterweight clearance dimension Lc is calculated.

  FIG. 5 shows a case where the counterweight 2 and the shock absorber 11 are in contact with Lu1 before Lu1 during the previous diagnosis. That is, this is a case where the previously measured Lc is smaller than Lu1, and for example, a diagnostic operation pattern as shown in FIG. 4 is obtained. In FIG. 5, the steady speed from the highest floor level to Lu1 is changed from the low speed V1 to the low speed V2 (<V1). Thereby, the impact at the time of the contact of the counterweight 2 and the shock absorber 11 in the current diagnostic operation is alleviated based on the record that the counterweight 2 and the shock absorber 11 are in contact before the previous Lu1.

  FIG. 6 shows a case where the car 1 is lowered from the stop position (Lc or Lu2) to the highest floor level when returning to the diagnostic operation. As shown in FIG. 6, the car 1 travels from the stop position to Lu1 with the steady speed as the second low speed V2, and thereafter the steady speed is set to the first low speed V1 until the top floor level 14 is reached. Drive at (> V2). As a result, the car 1 slowly descends at the second low speed V2, then increases to V1 and returns to the top floor, thereby improving safety and shortening the diagnosis time.

  Next, the diagnostic processing operation of the counterweight clearance diagnostic apparatus according to the present embodiment will be described with reference to FIGS.

  FIG. 7 is a flowchart showing a processing operation at the time of measuring the counterweight clearance dimension Lc by the diagnostic operation in the present embodiment.

  First, in step S1 of FIG. 7, it is determined by the diagnostic operation command unit 32 whether or not a call is suspended (for example, 3 minutes have passed without a car call). If no call is paused (Y in step S1), the process proceeds to step S2. If no call is paused (N in step S1), step S1 is repeatedly executed.

  In step S <b> 2, the car load detection unit 31 determines whether the car interior is unloaded (load 0%), that is, unmanned. If unattended (Y in step S2), the process proceeds to step S3. If not unattended (N in step S2), the process returns to step S1. In addition, the safety | security at the time of clearance measurement improves by performing diagnostic driving | running | working in a car room unattended.

  In step S <b> 3, the travel command unit 35 causes the car 1 to travel toward the top floor level 14. Following step S3, step S4 is executed.

  In step S <b> 4, the floor detection unit 22 determines whether the car 1 has arrived at the top floor level 14. If it has arrived (Y in step S4), the process proceeds to step S5. If it has not arrived (N in step S4), the process returns to step S3.

  In step S5, the limit switch operating position switching unit 33 switches the operating position of the ascent limit switch function in the electronic safety system. That is, the limit switch operating position switching unit 33 changes the operating position of the ascent limit switch function from the first ascent limit switch function operating position Lu1 during normal operation to the second ascent limit switch function during diagnosis operation. Switch to the operating position Lu2. As a result, the car 1 can be driven up to Lu2 beyond Lu1 at normal times. Following step S5, step S6 is executed.

  In step S6, whether or not the counterweight clearance dimension Lc at the time of the previous diagnosis recorded in the clearance dimension recording unit 38 by the diagnostic speed switching unit 34 was before the first ascent limit switch function operating position Lu1 (stored). The previous Lc <Lu1) is determined. If it is not in front (N in Step S6), the process proceeds to Step S7. If it is in front (Y in Step S6), Steps S7 to S9 are skipped and the process proceeds to Step S10.

  In step S7, the diagnostic driving speed is set to the first low speed V1 (for example, 5 m / min) by the diagnostic speed switching unit 34, and the car 1 is set to the first low speed V1 by the command from the travel command unit 35. Driving up. Following step S7, step S8 is executed.

  In step S <b> 8, the counter contact detector 36 determines whether the counterweight contact detector 12 has been operated, that is, whether the counterweight 2 has contacted the shock absorber 11. When not in contact (N in Step S8), the ascending operation of the car 1 is continued, and the process proceeds to Step S9. When in contact (Y in Step S8), Steps S9 to S12 are skipped, and Step S13 is performed. move on.

  In step S9, based on the signal from the limit switch function executing unit 23, the diagnostic speed switching unit 34 determines whether the car 1 has reached the first ascent limit limit switch function operating position Lu1. If it has reached (Y in Step S9), the process proceeds to Step S10, and if it has not reached (N in Step S9), the process returns to Step S7 and the ascending operation of the car 1 at the first low speed V1 is performed. Will continue.

  In step S10, the diagnostic speed switching unit 34 sets the diagnostic driving speed to a second low speed V2 (for example, 2 m / min) that is lower than the first low speed V1. The car 1 is lifted at the second low speed V2 (<V1). Following step S10, step S11 is executed.

  In step S11, it is determined whether the counterweight 2 has contacted the shock absorber 11 as in step S8. If not in contact (N in Step S11), the process proceeds to Step S12. If in contact (Y in Step S11), Step S12 is skipped and the process proceeds to Step S13.

  In step S12, the diagnostic speed switching unit 34 determines whether or not the car 1 has reached the second ascent limit limit switch function operating position Lu2 based on the signal from the limit switch function executing unit 23. If it has reached (Y in Step S12), the process proceeds to Step S13, and if it has not reached (N in Step S12), the process returns to Step S10, and the car 1 is lifted at the second low speed V2. Will continue.

  In step S <b> 13, the diagnostic operation command unit 32 instructs the travel command unit 35 to stop traveling, and the traveling of the car 1 is stopped. Following step S13, step S14 is executed.

  In step S 14, the clearance dimension measurement unit 37 starts the counter contact detection unit 36 of the counter weight contact detector 12 in step S 11 from the top floor level 14 in step S 4 based on the car position data from the car position detection unit 21. The moving distance of the car 1 until the movement is detected is calculated as the counterweight clearance dimension Lc. Following step S14, step S15 is executed.

  In step S15, the counterweight clearance dimension Lc calculated in step S14 is recorded in the clearance dimension recording unit 38. Following step S15, step S16 is executed.

  In step S16, the abnormality diagnosis unit 39 determines whether the counterweight clearance dimension Lc is within a predetermined determination reference value. If the value is within the determination reference value (Y in step S16), a series of processing ends. If it is outside the criterion value (N in step S16), that is, if Lc is abnormal, the process proceeds to step S17.

  In step S17, an abnormality report is sent from the abnormality diagnosis unit 39 to the monitoring center. Following step S17, step S18 is executed.

  In step S18, in order to set the counterweight clearance dimension to an appropriate value, measures such as a rope trimming operation are performed by a professional engineer. When step S18 is executed, a series of processing ends.

  Here, the correspondence between the above-described operation patterns in FIGS. 2 to 5 and the processing operation in FIG. 7 will be described.

  In the process of FIG. 7, V1 is set (step S7), the car 1 reaches Lu1 (Y in step S9), V2 is set (step S10), and the car 1 does not reach Lu2 (step S10). When the counterweight 2 comes into contact with the shock absorber 11 (Y in step S11) and the car stops (step S13), the operation pattern of FIG. 2 is obtained. In this case, the measured Lc is a value between Lu1 and Lu2.

  In the process of FIG. 7, V1 is set (step S7), the car 1 reaches Lu1 (Y in step S9), V2 is set (step S10), and the counterweight 2 is not in contact with the shock absorber 11 (N in Step S11) When the car 1 reaches Lu2 (Y in Step S12) and the car stops (Step S13), the operation pattern of FIG. 3 is obtained. In this case, the counterweight clearance dimension Lc calculated in step S14 is recorded in the clearance dimension recording unit 38 as being equal to or larger than the dimension from the highest floor level 14 to the second ascent limit switch function operating position Lu2. .

  In the process of FIG. 7, V1 is set (step S7), the car 1 does not reach Lu1 (N in step S9), the counterweight 2 comes into contact with the shock absorber 11 (Y in step S8), and the ride When the car stops (step S13), the operation pattern shown in FIG. 4 is obtained. In this case, the measured Lc is a value smaller than Lu1.

  In the process of FIG. 7, Lc at the time of the previous diagnosis is before Lu1, V1 is not set (Y in Step S6), V2 is set (Step S10), and counterweight 2 is placed in the buffer 11 before Lu1. When the car is touched (Y in Step S11) and the car stops (Step S13), the operation pattern shown in FIG. 5 is obtained. In this case, the measured Lc is a value smaller than Lu1.

  FIG. 8 is a flowchart showing the processing operation after the counterweight clearance dimension Lc is measured by the diagnostic operation in the present embodiment. By this processing operation, the car 1 is lowered and returned to the top floor level 14.

  First, in step S1 of FIG. 8, the diagnostic speed switching unit 34 causes the stop position of the car 1 to be equal to or higher than the first ascent limit limit switch function operating position Lu1 based on the signal from the limit switch function executing unit 23. Is determined. If it is greater than or equal to Lu1 (Y in step S1), the process proceeds to step S2, and if it is less than Lu1 (N in step S1), steps S2 and S3 are skipped and step 4 is executed.

  In step S2, the diagnostic speed switching unit 34 sets the diagnostic driving speed to the second low speed V2 (for example, 2 m / min), and the car 1 is set to the second low speed V2 by the command from the travel command unit 35. Descent operation is performed. Following step S2, step S3 is executed.

  In step S3, based on the signal from the limit switch function executing unit 23, the diagnostic speed switching unit 34 determines whether the car 1 is less than the first ascent limit switch function operating position Lu1. If it is less than Lu1 (Y in Step S3), the process proceeds to Step S4, and if it is not less than Lu1 (Lu1 or more) (N in Step S3), the process returns to Step S2 to get on at the second low speed V2. The descending operation of the car 1 is continued.

  In step S4, the diagnostic speed switching unit 34 sets the diagnostic operation speed to a first low speed V1 (for example, 5 m / min) that is larger than the second low speed. The descent operation is performed at the first low speed V1. Following step S4, step S5 is executed.

  In step S <b> 5, the floor detection unit 22 determines whether the car 1 has arrived (returned) to the top floor level 14. If it has arrived (Y in step S5), the process proceeds to step S6. If it has not arrived (N in step S5), the process returns to step S4 and the descending operation of the car 1 at the first low speed V1 continues. Is done.

  In step S <b> 6, the diagnostic operation command unit 32 instructs the travel command unit 35 to stop traveling, and the traveling of the car 1 is stopped. When the car 1 stops traveling, a series of processing ends.

  In the processing operation of FIG. 8, when it is determined in step S1 that the car position is Lu1 or more (Y of step S1), the processing of steps S2 to S6 corresponds to the operation pattern of FIG. Therefore, according to the processing in steps S2 to S6, the car 1 gradually descends at the second low speed V2 and then returns to the highest floor level by increasing the speed to V1. Thus, safety is improved. In addition, the diagnosis time can be shortened.

  In the processing operation of FIG. 8, when it is determined in step S1 that the car position is less than Lu1 (N in step S1), the diagnosis speed is not set to the second low speed V2, but from the start of descent. The first low speed V1 is set to be larger than the second low speed. In this case, the descending distance of the car 1 is short and there is little safety risk, and the diagnosis time can be shortened by setting the diagnosis speed to the first low speed V1.

  As described above, according to the present embodiment, in the case of diagnostic operation, the operation position of the ascent limit switch function in the electronic safety system is changed to an operation position that is larger than the normal operation position. As a result, it is possible to raise the vehicle to a higher position than during normal operation. Thereby, even if a clearance dimension is large, the clearance of a counterweight can be measured appropriately. In the present embodiment, since the operating position of the ascent limit switch function is changed to an operating position for diagnosis when the car is unattended, safety during clearance measurement is improved.

  Moreover, in this embodiment, the safety at the time of a measurement improves by making a diagnostic driving speed lower than usual. Further, by switching from the first low speed V1 to the second low speed V2 (<V1) during the ascending operation, the impact at the time of contact between the counterweight and the shock absorber is alleviated and the diagnosis time is reduced. The Further, by switching from the first low speed V2 to the first low speed V1 (> V2) during the descent operation, safety is improved and diagnosis time can be shortened.

  In addition, this invention is not limited to embodiment mentioned above, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of the embodiment.

  For example, at the time of diagnostic operation, it is preferable that the car room is unmanned as in the above-described embodiment, but even if a professional engineer who performs maintenance work is on a car with no general passengers good.

  Further, the position of the car is not limited to the governor encoder, and may be detected using a rotary encoder connected to an electric motor that drives the hoisting machine or an encoder connected to a guide roller provided in the car.

  Further, the unmanned state of the car may be determined based on an image in the car room acquired by a camera provided in the car room.

  The elevator may have a machine room in which a hoisting machine and a control device are installed, or may be a so-called machine room-less elevator in which the hoisting machine and the control device are installed in a hoistway.

DESCRIPTION OF SYMBOLS 1 ... Riding car 2 ... Counterweight 3 ... Main rope 4 ... Electric hoisting machine 5 ... Electric hoisting machine pulley 6 ... Governor 7 ... Governor encoder 8 ... Governor rope 9 ... Coupler 10 ... Governor pulley 11 ... Shock absorber 12 ... Counterweight contact detector 13 ... Load detector 14 ... Top floor level 20 ... Safety controller CPU
30 ... Control device CPU
40 ... Communication line 41 ... Monitoring center

Claims (7)

A counter weight clearance diagnostic device for an elevator that performs a diagnostic operation of a car and measures a clearance dimension between a shock absorber and a counter weight,
During normal operation, a first limit switch position that is larger than the top floor level is set as a rise limit value that limits the rise of the car beyond the top floor level, and the position of the car and the first A safety control device that limits the ascent of the car based on a comparison with the limit switch position of
In the diagnostic operation, a limit switch operation position switching unit that changes the increase limit value to a second limit switch position that is larger than the first limit switch position;
An elevator counterweight clearance diagnostic apparatus comprising: The elevator counterweight clearance diagnostic apparatus according to claim 1,
In the diagnostic operation, when the shock absorber and the counterweight contact before the car reaches the second limit switch position, and when the car reaches the second limit switch position. The elevator counterweight clearance diagnostic apparatus according to any one of the preceding claims, wherein the car is stopped and the clearance dimension is measured based on a moving distance of the car from the top floor level. The elevator counterweight clearance diagnosis apparatus according to claim 1 or 2,
In the safety control device, a final limit switch position larger than the first limit switch position is set,
The elevator counterweight clearance diagnostic apparatus, wherein the second limit switch position is less than the final limit switch position. The elevator counterweight clearance diagnostic apparatus according to claim 1,
The elevator counterweight clearance diagnostic apparatus, wherein the limit switch operating position switching unit changes the increase limit value when the car is unattended. The elevator counterweight clearance diagnostic apparatus according to claim 2,
In the diagnostic operation, the car is lifted from the top floor level to the first limit switch position with a first low speed as a steady speed, and from the first limit switch position to the second limit switch position. Up to the limit switch position, the elevator counterweight clearance diagnosis apparatus is characterized in that the second low speed lower than the first low speed is set to the steady speed and the lift operation is performed. The elevator counterweight clearance diagnostic apparatus according to claim 5,
When the clearance dimension measured at the time of the previous diagnosis is smaller than the dimension from the top floor level to the first limit switch position, in the diagnostic operation, the car has the second low speed. An elevator counterweight clearance diagnostic apparatus, wherein the elevator is operated at the steady speed. The elevator counterweight clearance diagnostic apparatus according to claim 5 or 6,
In the diagnostic operation, when the car is lowered to the top floor level, the first limit switch position is lowered with the second low speed as the steady speed, and the first limit switch position is reached. The elevator counterweight clearance diagnostic apparatus, wherein the first lower speed is lowered to the steady speed from the switch position to the uppermost floor level.

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