Clearance measuring device

Abstract

To provide a clearance measuring device capable of reducing the burden of movement on a maintenance worker when measuring the clearance between an elevator counterweight and a buffer. [Solution] The clearance measurement device calculates the number of measured pulses output during the period from when the door zone detection device detects the car entering the top floor door zone entry position until the car stops at a position above the top floor door zone entry position, converts the number of measured pulses to the measured distance traveled by the car, and then calculates the calculated distance from the top floor level position to the complete stop position from the reference distance from the top floor door zone entry position to the top floor level position and the measured distance. The clearance measurement device also accepts input of a measured value of the clearance when the car is stopped at the complete stop position, and calculates the clearance when the car is stopped at the top floor level position from the accepted measured value and the calculated distance.

Description

Technical Field

[0001] The present disclosure relates to a clearance measuring device for measuring the clearance of a counterweight of an elevator.

Background Art

[0002] Patent Document 1 describes a method for measuring the clearance between a balance weight and a buffer of an elevator. According to this method, a maintenance worker installs a measuring instrument for measuring the distance from the buffer to the balance weight in the pit of the hoistway. Then, the maintenance worker exits the hoistway, sets the elevator to the automatic mode, and registers a call for the car to the top floor to stop the car at the landing on the top floor. And the maintenance worker performs the measurement by the measuring instrument and receives the measurement result on a mobile terminal.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technique of Patent Document 1, in the operation of measuring the clearance between the balance weight and the buffer, after the maintenance worker performs the operation in the pit of the hoistway, it is necessary to exit the hoistway to operate in order to automatically operate the elevator. For this reason, there is a problem that the moving burden of the maintenance worker during clearance measurement is large.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to provide a clearance measuring device capable of reducing the moving burden of a maintenance worker when measuring the clearance between a balance weight and a buffer of an elevator.

Means for Solving the Problems

[0006] The clearance measuring device of this disclosure is a clearance measuring device for measuring the clearance between a buffer and a counterweight located in a pit of an elevator shaft, and comprises: a pulse generator that generates pulses corresponding to the distance traveled by the elevator car; a storage device that stores position information of the top floor door zone entry position, which is the entry position into the top floor door zone, and the top floor level position, which is the floor level of the top floor; a door zone detection device that detects the entry of the elevator car into the top floor door zone entry position; an elevator control device that performs complete stop control during elevator inspection, stopping the elevator car, which is ascending by manual operation, at a position above the top floor door zone entry position; and a calculation device that calculates the clearance when the elevator car is stopped at the top floor level position. The calculation unit is configured to perform the following: a first process which calculates the number of actual pulses output from the pulse generator during the period from when the door zone detection device detects the entry of the elevator car into the top floor door zone until the elevator car comes to a complete stop due to complete stop control; a second process which converts the number of actual pulses into the actual distance the elevator car has traveled; a third process which calculates the calculated distance from the top floor level to the complete stop position due to complete stop control based on the reference distance from the top floor door zone entry position to the top floor level position obtained from the position information and the actual distance; a fourth process which receives input of the clearance measurement value measured in the pit when the elevator car is stopped at the complete stop position; and a fifth process which calculates the clearance when the elevator car is stopped at the top floor level position based on the measurement value received in the fourth process and the calculated distance. [Effects of the Invention]

[0007] For maintenance personnel to move the elevator car from the pit in the hoistway, manual operation is required. However, manual operation from within the pit makes it difficult to accurately stop the car at the top floor level. The clearance measuring device of this disclosure makes it possible to measure the clearance when the elevator car is stopped at the top floor level without having to operate the elevator car to stop at the top floor level. As a result, the clearance can be measured while the maintenance personnel are in the pit, thereby reducing the burden of movement on the maintenance personnel when measuring the clearance. [Brief explanation of the drawing]

[0008] [Figure 1] This diagram schematically shows an elevator system to which the clearance measuring device according to the embodiment is applied. [Figure 2] This is a block diagram showing the configuration of the clearance measuring device according to the embodiment. [Figure 3] This is a diagram illustrating how to measure CWT clearance. [Figure 4] This is a flowchart of the routines executed by the elevator control system during elevator inspection. [Figure 5] This is a block diagram showing the functions of the computing device according to the embodiment. [Figure 6] This is a flowchart showing the routine for the CWT clearance measurement process executed in the computing unit. [Figure 7] This figure shows an example of the CWT clearance measurement screen displayed on a maintenance terminal. [Figure 8] This figure shows an example of hardware resources for a computing device. [Figure 9] This figure shows another example of hardware resources for the computing unit. [Modes for carrying out the invention]

[0009] The embodiments will be described below with reference to the drawings. In each drawing, elements common to all parts are denoted by the same reference numerals, and redundant explanations are omitted.

[0010] Embodiment. 1. Elevator System Configuration Figure 1 is a schematic diagram showing an elevator system to which the clearance measuring device according to the embodiment is applied. The elevator system comprises a car 1 and a counterweight 2. The car 1 moves up and down in the hoistway 3. The car 1 and the counterweight 2 are suspended in the hoistway 3 by a main rope 4. The counterweight 2 moves in the hoistway 3 in the opposite direction to the direction in which the car 1 moves. The counterweight is also denoted as "CWT".

[0011] The main rope 4 is wound around the drive sheave 6 of the hoisting machine 5. The cage 1 and counterweight 2 move in accordance with the rotation of the drive sheave 6. That is, the cage 1 and counterweight 2 are driven by the hoisting machine 5. The hoisting machine 5 is controlled by the control panel 10. That is, the movement of the cage 1 is controlled by the control panel 10. Figure 1 shows an example in which the hoisting machine 5 and control panel 10 are installed in the pit 3a of the hoistway 3. The hoisting machine 5 and control panel 10 may also be installed at the top of the hoistway 3.

[0012] In Figure 1, the elevator car 1 stopped at landing 8a on the top floor is shown by a solid line. The counterweight 2 when the elevator car 1 is stopped at landing 8a is also shown by a solid line. In Figure 1, the elevator car 1 stopped at landing 8b on the lowest floor and the elevator car 1 moving toward the top floor are shown by dashed lines. In the following, if it is not necessary to specify which floor the landing is on, the landing will be denoted by the symbol 8.

[0013] A buffer 9 for the counterweight 2 is provided in the pit 3a of the elevator shaft 3. The buffer 9 is positioned directly below the counterweight 2. Figure 1 shows an example where the buffer 9 is spring-type. The buffer 9 may also be hydraulic.

[0014] A speed governor 12 is installed above the hoistway 3. The speed governor 12 has a speed governor sheave 14. A speed governor rope 16 is wound around the speed governor sheave 14. The speed governor rope 16 is laid annularly in the hoistway 3 and is connected to the car 1. Also, the speed governor rope 16 is wound around a tension pulley (not shown) disposed at the lower part of the hoistway 3.

[0015] The speed governor sheave 14 rotates as the car 1 moves up and down. That is, when the car 1 moves up and down, the speed governor rope 16 moves circularly, and the speed governor sheave 14 rotates at a rotational speed corresponding to the running speed of the car 1. A pulse generator 20 for generating a pulse corresponding to the moving distance of the car 1 is provided on the speed governor sheave 14. The moving distance of the car 1 is, for example, proportional to the number of pulses generated during that period. As the pulse generator 20, for example, an encoder or a resolver that generates a pulse signal according to the rotation of the speed governor sheave 14 is used. The pulse generator 20 may be installed on the hoisting machine 5 as a device that generates a signal according to the rotation of the drive sheave 6 of the hoisting machine 5. The pulses output from the pulse generator 20 are sent to the control panel 10 and counted.

[0016] The elevator device includes a door zone detection device 22. The door zone detection device 22 is a device that detects the presence of the car 1 in the door zone at each landing 8. The door zone here is a range where the door opening of the car 1 is permitted, and is a range that extends upward and downward from the position of the floor level of each landing 8. The door zone detection device 22 includes, for example, a plate 24 and a sensor 26. The plate 24 is provided on a fixed body of the hoistway 3. The sensor 26 is provided on the car 1. The sensor 26 outputs a landing signal when it detects the plate 24. The plate 24 is an example of a detected object detected by the sensor 26. The plate 24 is disposed at a position where it is detected by the sensor 26 in the door zone of each landing 8.

[0017] Note that in each landing 8, the upward door zone where the upward car 1 enters does not coincide with the downward door zone where the downward car 1 enters. Therefore, in each landing 8, a plate 24 corresponding to the upward door zone and a plate 24 corresponding to the downward door zone are provided respectively. In FIG. 1, the plate 24 corresponding to the upward door zone of the top floor is illustrated. In the following description, the entry position into the upward door zone of the top floor is referred to as the "top floor door zone entry position", and the position of the top floor level is referred to as the "top floor level position". The landing signal output from the door zone detection device 22 is sent to the control panel 10.

[0018] The elevator device includes a first limit switch 30 and a second limit switch 32. The first limit switch 30 outputs an ON signal when detecting the car 1 that has traveled to a first position above the top floor level position. The second limit switch 32 outputs an ON signal when detecting the car 1 that has traveled to a second position below the top floor door zone entry position. The first limit switch 30 and the second limit switch 32 are installed on a fixed body of the hoistway 3. The signals output from the first limit switch 30 and the second limit switch 32 are sent to the control panel 10 respectively.

[0019] 2. Configuration of the Clearance Measuring Device FIG. 2 is a block diagram showing the configuration of the clearance measuring device according to the embodiment. The clearance measuring device includes the above-described control panel 10, a pulse generator 20, a door zone detection device 22, a first limit switch 30, a second limit switch 32, and a maintenance terminal 40. The control panel 10 includes a maintenance switch 52, an elevator control device 54, a storage device 56, and an arithmetic device 60. The pulse generator 20, the door zone detection device 22, the first limit switch 30, and the second limit switch 32 are electrically connected to the control panel 10.

[0020] The maintenance switch 52 is a switch used by maintenance personnel to switch the elevator's operating mode between normal mode and maintenance mode. The maintenance signal from the maintenance switch 52 is sent to the elevator control device 54. During normal elevator operation, the maintenance switch 52 is set to normal mode. When maintenance personnel perform inspections or checks on the elevator, they first operate the maintenance switch 52 to set the operating mode to maintenance mode. When the operating mode is maintenance mode, the elevator control device 54 does not trigger an alarm to indicate an abnormality, even if it detects elevator operation that would normally be judged as abnormal.

[0021] The elevator control device 54 controls the landing position of the elevator car 1 at each landing 8 based on the landing signal and the pulse count value. The elevator control device 54 also switches the elevator's operating mode based on maintenance signals. Furthermore, the elevator control device 54 has a function to switch the elevator's operating mode between automatic operation mode and manual operation mode. Automatic operation mode is an operating mode in which the elevator car 1 automatically responds to registered calls. Manual operation mode is an operating mode in which maintenance personnel or others manually move the elevator car 1 by operating dedicated equipment. In manual operation mode, a landing call is not registered even if a direction button (not shown) is pressed at the landing 8. Similarly, a car call is not registered even if a destination button (not shown) is pressed inside the elevator car 1. Switching between operating modes is performed, for example, from an operation panel (not shown) inside the elevator car 1.

[0022] During elevator inspection using the inspection mode described later, if the elevator control device 54 receives an ON signal from the first limit switch 30, it executes a complete stop control that decelerates the car 1 and forces it to stop. When the car 1 stops due to the complete stop control, the car 1 will not restart even if maintenance personnel operate specialized equipment. Also, during elevator inspection using the inspection mode described later, if the elevator control device 54 receives an ON signal from the second limit switch 32, it executes a pause control that decelerates the car 1 and forces it to temporarily stop. When the car 1 temporarily stops due to the pause control, the car 1 will restart if maintenance personnel operate specialized equipment.

[0023] The memory device 56 is a device that stores various data related to elevator control. The elevator control device periodically learns the top floor level position (mm) and the top floor door zone entry position (mm), and stores this position information in the memory device 56.

[0024] The maintenance terminal 40 is a maintenance computer used by elevator maintenance personnel during inspection work. The maintenance terminal 40 transmits and receives information with the elevator control device 54 and the computing device 60 by connecting to the control panel 10, for example. The maintenance terminal 40 may also be connected to the control panel 10 via a public telephone line, for example.

[0025] The distance L formed between the counterweight 2 and the buffer 9 must be within a reference range for elevator safety when the car 1 is stopped at the top floor level position on the top floor landing 8a. The distance L when the car 1 is stopped at the top floor level position on the top floor landing 8a is also hereinafter referred to as the "CWT clearance". The calculation device 60 is a device that performs calculation processing related to the measurement of the CWT clearance when the elevator mode is set to periodic inspection mode. This calculation processing is hereinafter referred to as the "CWT clearance measurement processing". Figure 3 is a diagram illustrating the method of measuring the CWT clearance. The method of measuring the CWT clearance using the functions of the calculation device 60 will be explained in detail below, with reference to Figure 3.

[0026] 3. Measurement operation of CWT clearance CWT clearance is measured, for example, during a periodic inspection of an elevator. A maintenance worker boards the elevator car 1 and stops it at landing 8, one floor above the lowest floor. Before exiting the elevator car 1, the maintenance worker switches the operating mode from automatic to manual mode while inside the car 1. The maintenance worker enters the pit 3a from landing 8b on the lowest floor. The maintenance worker then sets the maintenance switch 52 to maintenance mode. The maintenance worker also connects the maintenance terminal 40 to the control panel 10 and sets the elevator mode to periodic inspection mode from the maintenance terminal 40. In periodic inspection mode, the travel speed of the elevator car 1 by manual operation is limited according to the car's position. The calculation unit 60 performs the CWT clearance measurement process during the inspection of the elevator, which is set to periodic inspection mode.

[0027] The maintenance worker manually operates a dedicated device to instruct the elevator control device 54 on the elevator operation necessary for the CWT clearance measurement process to be performed in the calculation unit 60. Figure 4 is a flowchart of the routine executed by the elevator control device during elevator inspection. The routine shown in Figure 4 starts, for example, when the elevator is being inspected with various settings such as manual operation mode, maintenance mode, and periodic inspection mode, and the elevator car 1 is stopped at the lowest floor level.

[0028] In step S100, the elevator control device 54 determines whether there is a manual operation instruction. During periodic inspection, the maintenance worker in pit 3a first instructs the elevator to move in the upward direction. Here, the process in step S100 is repeatedly executed until an operation instruction is received from the maintenance worker, at which point the process proceeds to step S102.

[0029] In step S102, the elevator control device 54 causes the elevator car 1 to travel upward at a predetermined first set speed. The first set speed here is, for example, 30 m / min. Once the process in step S102 is completed, the process proceeds to step S104.

[0030] When car 1, which is traveling in the upward direction, reaches the second position, the second limit switch 32 detects an ON signal. In step S104, the elevator control device 54 determines whether it has detected the ON signal of the second limit switch 32. If the determination is unsuccessful, it is determined that car 1 has not reached the second position, and the process returns to step S102, and the elevator continues to travel.

[0031] On the other hand, if the determination in step S104 is successful, it is determined that the car 1 has reached the second position, and the process proceeds to step S106. In step S106, the elevator control device 54 performs a pause control. As a result, the car 1 is forced to decelerate from the second position and pauses at the pause position. As a result, the counterweight 2 pauses before descending into the pit 3a. After the process in step S106 is completed, the process proceeds to step S108.

[0032] When the elevator car 1 and counterweight 2 are temporarily stopped, the maintenance worker performs a safety check and then issues a restart instruction by manual operation. Here, while the maintenance worker continues to press the instruction button for restarting, the restart instruction is sent to the elevator control device 54. In step S108, the elevator control device 54 determines whether there is a restart instruction. If the determination is not true, the process returns to step S106 and the elevator car 1 is temporarily stopped. If the determination is true, the process proceeds to step S110.

[0033] In step S110, the elevator control device 54 causes the elevator car 1 to travel upward at a specified second set speed. This second set speed is lower than the first set speed, for example, 4 m / min. Once step S110 is completed, the process proceeds to step S112.

[0034] In step S112, the elevator control device 54 determines whether it has detected an ON signal from the first limit switch 30. When the car 1 reaches the first position, the first limit switch 30 detects an ON signal. Therefore, if the determination in step S112 is not true, it is determined that the car 1 has not reached the first position, and the process returns to step S108. Thus, according to the process from step S106 to step S112, while the car 1 is traveling, the car 1 travels at the second set speed when the travel button is pressed by a maintenance worker until the car 1 reaches the first position, and the car 1 is temporarily stopped when the travel button is released.

[0035] If the determination in step S112 is successful, it is determined that the elevator car 1 has reached the first position, and the process proceeds back to step S114. In step S114, the elevator control device 54 executes a complete stop control to forcibly decelerate and stop the elevator car 1. The position where the elevator car 1 stops due to the complete stop control is hereafter referred to as the "complete stop position". After the elevator car 1 has come to a complete stop, the elevator control device 54 will not allow the car to move even if it receives a restart instruction by operating the travel button. Once the processing in step S114 is completed, the processing of this routine is terminated.

[0036] The arithmetic unit 60 performs CWT clearance measurement processing while the periodic inspection routine shown in Figure 4 is being executed. Figure 5 is a block diagram showing the functions of the arithmetic unit according to the embodiment. The arithmetic unit 60 includes a first processing unit 61, a second processing unit 62, a third processing unit 63, a fourth processing unit 64, a fifth processing unit 65, and a sixth processing unit 66 as functional blocks for performing CWT clearance measurement processing. The CWT clearance measurement processing performed in these functional blocks will be described below with reference to the flowchart.

[0037] Figure 6 is a flowchart showing the routine for CWT clearance measurement processing executed in the computing unit. The routine shown in Figure 6 is executed when the elevator is set to periodic inspection mode.

[0038] The processing from step S120 to step S128 corresponds to the first processing performed in the first processing unit 61. In the first processing, the first processing unit 61 of the arithmetic unit 60 calculates the measured number of pulses, which is the measured number of pulses output from the pulse generator 20 during the period when the elevator car 1 moves from the position entering the top floor door zone to the position of complete stop.

[0039] Specifically, in step S120, it is determined whether the elevator car 1 has entered the door zone of the top floor. Here, the calculation unit 60 determines whether the door zone detection device 22 has detected a landing signal indicating that the car 1 has entered the top floor door zone entry position. If the determination is unsuccessful, it is determined that the car 1 is below the top floor door zone entry position, and the process in step S120 is repeatedly executed until the determination is successful.

[0040] If the determination is successful in step S120, the process proceeds to step S122. In step S122, at the entry position into the top floor door zone, the counter value of the pulse output from the pulse generator 20 is latched as the first counter value. Once the process in step S122 is completed, the process proceeds to step S124.

[0041] In step S124, it is determined whether the elevator has stopped. If the determination is unsuccessful, the process in step S124 is repeated until the determination is successful. Once the determination is successful, the process proceeds to step S126.

[0042] In step S126, at the complete stop position, the counter value of the pulse output from the pulse generator 20 is latched as the second counter value. Once the processing in step S126 is complete, the process proceeds to step S128.

[0043] In step S128, the number of measured pulses during the period of movement from the top floor door zone entry position to the complete stop position is calculated according to the following equation (1). Once the processing in step S128 is completed, the process proceeds to step S130. [Measured pulse count] = [Second counter value] - [First counter value] ... (1)

[0044] The processing in step S130 corresponds to the second processing performed in the second processing unit 62. In the second processing of step S130, the second processing unit 62 of the arithmetic unit 60 converts the measured number of pulses into the measured distance (mm) that the cage 1 has moved. Once the processing in step S130 is completed, the process proceeds to step S132.

[0045] The processing from step S132 to step S134 corresponds to the third processing performed in the third processing unit 63. In the third processing, the third processing unit 63 of the arithmetic unit 60 calculates the calculation distance (mm), which is the distance from the top floor level position to the complete stopping position of the elevator car 1. Specifically, in step S132, the reference distance from the top floor door zone entry position to the top floor level position is calculated according to the following equation (2). Here, the top floor door zone entry position and the top floor level position utilize learned values ​​stored as position information in the storage device 56. After the processing in step S132 is performed, the process proceeds to step S134. [Reference distance (mm)] = [Top floor level position] - [Top floor door zone entry position] ... (2)

[0046] In step S134, the calculated distance is calculated by substituting the measured distance calculated in step S130 and the reference distance calculated in step S132 into the following equation (3). Once the process in step S134 is completed, the process proceeds to step S136. [Calculated distance (mm)] = [Measured distance] - [Reference distance] ... (3)

[0047] The process in step S136 corresponds to the fourth process executed in the fourth processing unit 64. In the fourth process of step S136, the fourth processing unit 64 of the arithmetic unit 60 determines whether it has received a measurement of the distance L formed between the counterweight 2 and the buffer 9 when the car 1 is stopped at the complete stop position from the maintenance terminal 40. The measurement of distance L is a value measured by a maintenance worker inside the pit 3a and is therefore also called the "pit measurement value". Figure 7 shows an example of the CWT clearance measurement screen displayed on the maintenance terminal. The maintenance worker measures the pit measurement value at the complete stop position of the elevator. When the pit measurement value is entered into the pit measurement value field on the CWT clearance measurement screen and the "Calculate" button on the screen is pressed, the determination in step S136 is met and the process proceeds to step S138.

[0048] The process in step S138 corresponds to the fifth process executed in the fifth processing unit 65. In the fifth process in step S138, the CWT clearance is calculated by substituting the calculated distance calculated in step S134 and the pit measurement value received in step S136 into the following equation (4). Once the process in step S138 is completed, the process proceeds to step S140. [CWT clearance (mm)] = [Pit measurement] - [Calculated distance] ... (4)

[0049] The process in step S140 corresponds to the sixth process executed in the sixth processing unit 66. In the sixth process of step S140, the sixth processing unit 66 of the arithmetic unit 60 outputs the CWT clearance calculated in the fifth process of step S138 to the maintenance terminal 40. As a result, the calculation result of the CWT clearance is displayed on the CWT clearance measurement screen of the maintenance terminal 40, as illustrated in Figure 7. The maintenance worker checks the displayed CWT clearance value and inspects whether it falls within the reference range.

[0050] According to the CWT clearance measurement method described above, the following effects can be obtained.

[0051] In order for a maintenance worker to move the elevator car 1 from pit 3a, manual operation is required. However, manual operation from pit 3a makes it difficult to accurately stop the car 1 at the top floor level. According to the clearance measuring device of this embodiment, it is possible to measure the CWT clearance without having to accurately stop the elevator car 1 at the top floor level. As a result, it becomes possible for one maintenance worker to measure the CWT clearance by working in pit 3a, thereby improving the efficiency and ease of CWT clearance measurement.

[0052] Furthermore, during manual operation of the elevator, the speed to the first stop position is limited to the first set speed, thereby increasing safety during manual operation. In addition, above the first stop position, the travel speed of the car 1 is limited to a second set speed, which is even slower than the first set speed, thereby improving measurement accuracy and increasing safety by limiting the speed at which the counterweight 2 descends into the pit 3a.

[0053] 4. Variations The clearance measuring device of the embodiment may adopt the following modified form.

[0054] 4-1. Hardware resources of the arithmetic unit 60 Figure 8 shows an example of hardware resources for a computing unit. The computing unit 60 includes a processing circuit 74 as hardware resources, which includes a processor 70 and memory 72. The processing circuit 74 may include multiple processors 70. The processing circuit 74 may include multiple memory 72. The memory 72 may be configured as part or all of the storage device 56.

[0055] In this embodiment, the functions of the arithmetic unit 60 can be realized by software, firmware, or a combination of software and firmware, which are written as programs. The programs are stored in memory 72. The arithmetic unit 60 realizes each function by having the processor 70 (computer) execute the programs stored in memory 72.

[0056] The processor 70 is also called a CPU (Central Processing Unit), central processing unit, processing unit, arithmetic unit, microprocessor, microcomputer, or DSP. For memory 72, semiconductor memory, magnetic disks, flexible disks, optical disks, compact disks, minidiscs, or DVDs may be used. Possible semiconductor memories include RAM, ROM, flash memory, EPROM, and EEPROM.

[0057] Figure 9 shows another example of hardware resources for a computing unit. In the example shown in Figure 9, the computing unit 60 includes, for example, a processor 70, memory 72, and a processing circuit 78 including dedicated hardware 76. Figure 9 shows an example in which some of the functions of the computing unit 60 are realized by the dedicated hardware 76. All of the functions of the computing unit 60 may also be realized by the dedicated hardware 76. The dedicated hardware 76 can be a single circuit, a composite circuit, a programmed processor, a parallel programmed processor, an ASIC, an FPGA, or a combination thereof.

[0058] The hardware resources of the elevator control device 54 are the same as those shown in the example in Figure 8 or Figure 9. The elevator control device 54 includes a processing circuit that includes a processor and memory as hardware resources. The elevator control device 54 implements the function of executing the routine shown in Figure 3 by executing a program stored in memory using the processor. The elevator control device 54 may also include a processing circuit that includes a processor, memory, and dedicated hardware as hardware resources. Some or all of the functions of the elevator control device 54 may be implemented by dedicated hardware.

[0059] Furthermore, the control panel 10 may have all or part of the functions of the calculation unit 60 mounted on the elevator control device 54.

[0060] 4-2. Elevator control device 54 The complete stop control performed by the elevator control device 54 is not limited to the control performed when an ON signal is received from the first limit switch 30. That is, the complete stop control may be configured as a control performed when a maintenance worker releases the travel button and stops the manual operation instruction at a position above the top floor door zone entry position. Alternatively, a sensor for detecting the arrival of the car 1 may be installed at a position above the top floor door zone entry position, and the complete stop control may be performed when the sensor detects the arrival of the car. [Explanation of symbols]

[0061] 1. Car, 2. Counterweight, 3. Hoistway, 3a. Pit, 4. Main rope, 5. Hoisting machine, 6. Drive sheave, 8. Landing, 8a. Top floor landing, 8b. Bottom floor landing, 9. Buffer, 10. Control panel, 12. Governor, 14. Governor sheave, 16. Governor rope, 20. Pulse generator, 22. Door zone detection device, 24. Plate, 26. Sensor, 30. First limit switch, 32. Second limit switch, 40. Maintenance terminal, 52. Maintenance switch, 54. Elevator control device, 56. Memory device, 60. Processing unit, 61. First processing unit, 62. Second processing unit, 63. Third processing unit, 64. Fourth processing unit, 65. Fifth processing unit, 66. Sixth processing unit, 70. Processor, 72 Memory, 74 processing circuits, 76 dedicated hardware, 78 processing circuits

Claims

1. A clearance measuring device for measuring the clearance between a buffer and a counterweight located in the pit of an elevator shaft, A pulse generator that generates pulses corresponding to the distance traveled by the cage, A storage device that stores location information for the top floor door zone entry position, which is the entry position to the top floor door zone, and the top floor level position, which is the floor level of the top floor, A door zone detection device that detects the entry of the elevator car into the door zone entry position on the top floor, During the inspection of the aforementioned elevator, an elevator control device performs a complete stop control that stops the elevator car, which is ascending by manual operation, at a position above the entry point to the top floor door zone, and The system includes a calculation device that calculates the clearance when the elevator is stopped at the uppermost floor level, The aforementioned computing device is A first process that calculates the number of actual pulses output from the pulse generator during the period from when the door zone detection device detects the entry of the elevator car into the top floor door zone until the elevator car comes to a complete stop due to the complete stop control, A second process which converts the measured number of pulses into the measured distance traveled by the cage, A third process calculates the calculated distance from the top floor level position to the complete stop position due to the complete stop control, based on the reference distance from the top floor door zone entry position to the top floor level position obtained from the position information and the measured distance. A fourth process that receives input of the measured clearance value measured in the pit when the cage is stopped at the complete stop position, A fifth process, based on the measured value and calculated distance received in the fourth process, calculates the clearance when the elevator is stopped at the uppermost floor level, A clearance measuring device configured to perform the following.

2. The system includes a first limit switch that detects when the elevator car reaches a first position above the top floor level, The elevator control device executes the complete stop control when the first limit switch detects that the elevator car has reached the first position. The clearance measuring device according to claim 1, configured as described above.

3. The system includes a second limit switch that detects when the aforementioned elevator has reached a second position below the entry position into the top floor door zone, The elevator control device is During the inspection of the elevator, when the second limit switch detects that the elevator car has reached the second position, a temporary stop control is executed to stop the elevator car. The clearance measuring device according to claim 2, configured as follows.

4. The elevator control device is During the inspection of the elevator, the speed up to the second position is limited to the first set speed, and the speed from the second position to the first position is limited to a second set speed that is lower than the first set speed. The clearance measuring device according to claim 3, configured as described above.

5. The arithmetic unit, in the fourth process, The system receives input of the measured values ​​from a maintenance terminal that can communicate with the aforementioned computing device. A clearance measuring device according to any one of claims 1 to 4, configured as described above.

6. The aforementioned computing device is The sixth process is executed to output the calculation result from the fifth process to the maintenance terminal. The clearance measuring device according to claim 5, configured as described above.

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