Elevator emergency stop test device and emergency stop test method

Abstract

Disclosed are a device and a method for testing emergency stop of an elevator, with which it is possible to enhance the reliability or accuracy of an operation check performed on an emergency stop device. This device for testing emergency stop of an elevator comprises: a motor control unit (101) that checks the operating condition of an emergency stop device provided to an elevator and causes a motor installed in a hoisting machine (50) to generate a prescribed torque in a state where the emergency stop device is in operation; and an emergency-stop-device operation detection unit (103) that checks the operating condition of the emergency stop device on the basis of a rotational movement amount (dS) of a sheave installed in the hoisting machine and a movement amount (dC) of an elevator car during generation of the prescribed torque by the motor.

Description

[Technical Field]

[0001] The present invention relates to an elevator emergency stop test device and an emergency stop test method for verifying the operation of an emergency stop device provided in an elevator. [Background technology]

[0002] Elevator systems are equipped with a governor and an emergency stop device to bring the elevator car to an emergency stop if it falls into a predetermined overspeed condition. The elevator car and governor are connected by a governor rope, and when an overspeed condition is detected, the governor restrains the governor rope, activating the emergency stop device on the elevator car side and bringing the elevator car to an emergency stop.

[0003] For such emergency stop devices, operational tests are conducted during elevator installation and maintenance inspections to confirm their functioning.

[0004] Regarding prior art related to emergency stop tests, the technology described in Patent Document 1 is known.

[0005] In this conventional technology, the emergency stop device is activated by intentionally operating the governor remotely, regardless of the elevator car's overspeed condition. Furthermore, by lifting the counterweight with a hydraulic jack, slack is created in the main rope between the drive sheave and the counterweight. Next, by releasing the brake and rotating the drive sheave, the slack in the main rope on the counterweight side is transferred to the main rope between the drive sheave and the elevator car. At this time, the descent of the elevator car is suppressed, and the slack in the main rope on the elevator car side is confirmed visually from the landing side. [Prior art documents] [Patent Documents]

[0006] [Patent Document 1] Japanese Patent Publication No. 2008-189430 [Overview of the project]

Problems to be Solved by the Invention

[0007] In the above prior art, the descent inhibition of the car and the loosening of the main rope are confirmed by visual inspection or the like, and it is difficult to perform highly reliable or highly accurate operation confirmation.

[0008] Therefore, the present invention provides an elevator emergency stop test device and an emergency stop test method that can improve the reliability or accuracy of the operation confirmation of the emergency stop device.

Means for Solving the Problems

[0009] In order to solve the above problems, an elevator emergency stop test device according to the present invention is for confirming the operating state of an emergency stop device provided in an elevator, and includes a motor control unit that generates a predetermined torque in a motor provided in a hoist in a state where the emergency stop device is operated, and an emergency stop device operation detection unit that confirms the operating state of the emergency stop device based on the rotational movement amount of a sheave provided in the hoist and the movement amount of the car when the motor generates a predetermined torque. Furthermore, it comprises one of the following means 。 The first means is for the emergency stop device operation detection unit to determine the operation status of the emergency stop device by comparing the rotational movement of the sheave with the movement of the elevator car. The second means is for the motor control unit to increase the torque generated by the motor in multiple stages up to a predetermined torque.

[0010] In order to solve the above problems, an elevator emergency stop test method according to the present invention is a method for confirming the operating state of an emergency stop device provided in an elevator, which operates the emergency stop device, and then generates a predetermined torque in a motor provided in the hoist, and based on the rotational movement amount of the sheave and the movement amount of the car when the motor generates a predetermined torque, confirms the operating state of the emergency stop device. By comparing the rotational movement of the sheave equipped in the hoisting machine with the movement of the elevator car, the operating status of the emergency stop device is determined. Based on the rotational movement amount of the sheave and the movement amount of the car, the operating state of the emergency stop device is confirmed.

Effects of the Invention

[0011] According to the present invention, the reliability or accuracy of the operation confirmation of the emergency stop device is improved.

[0012] Problems, configurations, and effects other than those described above will be clarified by the description of the following embodiments.

Brief Description of the Drawings

[0013] [Figure 1] This is a schematic diagram of an elevator system, which is one embodiment of the design. [Figure 2] This is a functional block diagram showing the configuration of the elevator control device in the embodiment. [Figure 3] This waveform diagram shows the torque command values ​​in the torque control performed by the motor control unit 101 (Figure 2) during the operation test of the emergency stop device. [Figure 4] This flowchart shows the operation of the elevator control device in the embodiment during an operation test of the emergency stop device. [Modes for carrying out the invention]

[0014] Embodiments of the present invention will be described below with reference to the following examples and drawings. In each figure, elements with the same reference number represent the same or similar functional elements.

[0015] Figure 1 is a schematic diagram of an elevator device according to one embodiment of the present invention.

[0016] As shown in Figure 1, the elevator car 3 and counterweight 4 are connected to one end and the other end of the main rope 2, respectively. The main rope 2 is wound around the sheave 51 and the direction change pulley 52 of the hoisting machine 50. As a result, the elevator car 3 and counterweight 4 are suspended within the elevator shaft 1.

[0017] The motor of the hoisting machine 50 is driven and controlled by the elevator control device 100, and when the sheave 51 rotates, the main rope 2 is driven by the sheave 51. As a result, the elevator car 3 and the counterweight 4 move in opposite directions within the hoistway 1. The elevator car 3 moves while being guided by the elevator car guide rail 5, and the counterweight 4 also moves while being guided by the counterweight guide rail (not shown).

[0018] In this embodiment, a three-phase synchronous motor, such as a permanent magnet synchronous motor, is used as the motor. Therefore, the motor is driven by three-phase AC power supplied from the elevator control device 100 via the power cable 300.

[0019] The hoisting machine 50 is equipped with an electromagnetic brake 53. When stopping the elevator car 3, the electromagnetic brake 53 brakes the rotation of the hoisting machine 50. For example, a disc-type electromagnetic brake is used as the electromagnetic brake 53.

[0020] In this embodiment, the hoisting machine 50 is equipped with multiple (two in Figure 1) electromagnetic brakes 53. The multiple electromagnetic brakes 53 are all in constant operation and constitute a multi-system brake (a dual-system brake in Figure 1).

[0021] An emergency stop device 11 is provided at the bottom of the elevator car 3. The emergency stop device 11 activates when the elevator car 3 is traveling at excessive speed, and uses a pair of brakes (not shown) to grip the guide rail 5. The frictional force acting between the brakes and the guide rail 5 slows down the elevator car 3, bringing it to an emergency stop.

[0022] The machine room located above the hoistway 1 houses a hoisting machine 50 and an elevator control device 100, as well as a governor 8 for activating the emergency stop device 11. An endless governor rope 10 is wound around the pulley of the governor 8. The governor rope 10 is also wound around a tension pulley 9 located at the bottom of the hoistway 1, which applies tension to the governor rope 10.

[0023] The governor rope 10 is engaged with the emergency stop device 11 via the operating mechanism 12. Therefore, the movement of the elevator car 3 drives the governor rope 10, causing the pulley of the governor 8 to rotate. The governor 8 is equipped with a gripping mechanism that grips the governor rope 10 and stops its movement when the descent speed of the elevator car 3 exceeds a predetermined value (for example, a speed not exceeding 1.4 times the rated speed). The governor 8 is equipped with a pendulum mechanism that rotates together with the pulley. The pendulum mechanism is driven by centrifugal force and operates the gripping mechanism when the descent speed of the elevator car 3 exceeds a predetermined value.

[0024] When the governor rope 10 stops moving due to the governor 8, the operating mechanism 12, being engaged with the governor rope 10, also stops moving along with the governor rope 10. At this time, the elevator car 3 continues to descend. Therefore, the operating mechanism 12 moves upward relative to the elevator car 3. This causes the operating mechanism 12 to operate and activate the emergency stop device 11. Consequently, the elevator car 3 slows down and comes to an emergency stop.

[0025] When performing an operational test of the emergency stop device 11 as described above, the elevator control device 100 operates the emergency stop device 11 and controls the motor of the hoisting machine 50 to generate a predetermined torque. At this time, the elevator control device 100 controls the motor to generate a predetermined torque greater than the rated torque in the direction in which the elevator car 3 descends, that is, in the direction in which the pair of brakes (not shown) in the emergency stop device 11 engage with the guide rail 5.

[0026] The elevator control device 100 determines the operating state of the emergency stop device 11 based on the amount of downward movement of the elevator car 3 and the amount of rotational movement of the sheave 51 when the motor generates torque.

[0027] The elevator control device 100 calculates the rotational movement of the sheave 51 based on the rotational position detection signal from the motor encoder 201. The elevator control device 100 also calculates the movement of the elevator car 3 based on the rotational position detection signal from the governor encoder 202.

[0028] The elevator control device 100 compares the calculated rotational displacement of the sheave 51 with the displacement of the elevator car 3, and determines that the emergency stop device 11 is functioning correctly if the rotational displacement of the sheave 51 is greater. The rotational displacement of the sheave 51 corresponds to the displacement of the main rope 2 toward the elevator car 3. Therefore, if the rotational displacement of the sheave 51 is greater, the displacement of the main rope 2 is greater than the displacement of the elevator car. In other words, the main rope 2 is slack on the elevator car side. Such slack in the main rope 2 indicates that the elevator car 3 is being properly stopped by the emergency stop device 11.

[0029] The elevator control device 100 normally controls the operation of the elevator car 3 based on the rotational position detection signal of the motor encoder 201. In this embodiment, the governor encoder 202 is normally used for detecting overspeed of the elevator car, etc. A safety control device (not shown) detects the speed of the elevator car 3 based on the rotational position detection signal of the governor encoder 202, and if the detected speed exceeds a predetermined overspeed (for example, a speed not exceeding 1.3 times the rated speed), it cuts off the power supply and brings the elevator car 3 to an emergency stop. The governor encoder 202 may also be attached to the governor 8 during the operation test of the emergency stop device 11.

[0030] Figure 2 is a functional block diagram showing the configuration of the elevator control device in this embodiment.

[0031] The elevator control device 100 includes a motor control unit 101, an emergency stop device operation confirmation mode activation unit 102, an emergency stop device operation detection unit 103, a sheave movement amount calculation unit 104, a car movement amount calculation unit 105, and an initial position storage unit 106.

[0032] The motor control unit 101 controls the operation of the motor of the hoisting machine 50 and the operation of the electromagnetic brake 53. In normal operation mode, the motor control unit 101 controls the motor of the hoisting machine 50 and the electromagnetic brake 53 so that the elevator car moves and stops in response to a call registered by an elevator user.

[0033] The emergency stop device operation confirmation mode activation unit 102 switches the operating mode of the motor control unit 101 from the normal operating mode to the emergency stop device operation confirmation mode when conducting an operation test of the emergency stop device 11. In the emergency stop device operation confirmation mode, the motor control unit 101 releases the electromagnetic brake 53 when the emergency stop device 11 is activated and performs torque control of the motor so that the motor of the hoisting machine 50 generates a predetermined torque according to the torque command value described later. The torque command value is either given to the motor control unit 101 by the emergency stop device operation confirmation mode activation unit 102, or is a value that the motor control unit 101 has in advance and is activated in the emergency stop device operation confirmation mode.

[0034] The emergency stop device operation confirmation mode activation unit 102 is activated when a maintenance technician operates a maintenance switch on the elevator control device 100 or a maintenance terminal that is communicatively connected to the elevator control device 100, thereby setting the operating mode of the motor control unit 101 to the emergency stop device operation confirmation mode.

[0035] The sheave movement amount calculation unit 104 calculates the rotational movement amount d of the sheave 51 based on the rotational position detection signal S1 output by the motor encoder 201. S Calculate.

[0036] The car movement amount calculation unit 105 calculates the amount of movement d of the elevator car 3 based on the rotational position detection signal S2 output by the governor encoder 202. C Calculate.

[0037] The emergency stop device activation detection unit 103 detects the rotational movement amount d of the sheave 51 calculated by the sheave movement amount calculation unit 104. S And the amount of movement d of the elevator car 3 calculated by the elevator car movement calculation unit 105. C Based on this, it is detected that the emergency stop device 11 is activated.

[0038] The initial position storage unit 106 stores the initial value P of the rotational position of the sheave 51. S0 and the initial value P of the basket position C0Record these. These initial values P S0 , P C0 are the values just before the operation test of the emergency stop device 11. At the start of the operation test, the values recorded by the motor control unit 101 are recorded in the initial position storage unit 106.

[0039] The emergency stop device operation detection unit 103 uses these initial values P S0 , P C0 , as well as the rotational movement amount d of the sheave 51 S and the movement amount d of the car 3 C to calculate and store the rotational position of the sheave 51 and the car position during the operation test of the emergency stop device 11. In this embodiment, each movement amount is detected by the difference between each position of the sheave 51 and the car 3 detected by the encoder during the emergency stop test and each initial position.

[0040] FIG. 3 is a waveform diagram showing the torque command value in the torque control executed by the motor control unit 101 (FIG. 2) during the operation test of the emergency stop device 11.

[0041] In the embodiment of FIG. 3, the torque T is represented by a pu value with the rated torque as the reference (= 1).

[0042] As shown in FIG. 3, the torque command value increases stepwise in a plurality of stages (T1 → T2 → T3) from the rated torque T1 (= 1). In this embodiment, T2 = 1.5 and T3 = 2.

[0043] Based on the torque command value shown in FIG. 3, the motor control unit 101 executes control. During the period when the motor generates torque, that is, at t1 to t3 in FIG. 3 respectively, the sheave movement amount calculation unit 104 (FIG. 2) calculates the rotational movement amount d of the sheave 51 S and the car movement amount calculation unit 105 (FIG. 2) calculates the movement amount d of the car 3 C .

[0044] The emergency stop device operation detection unit 103 (FIG. 2) calculates the rotational movement amount d of the sheave 51 when the motor generates torque T3 S and the movement amount d of the car 3C Based on this, it is determined whether the emergency stop device 11 is functioning correctly. The emergency stop device operation detection unit 103 (Figure 2) detects the rotational displacement d of the sheave 51 when the motor generates torques T1, T2, and T3. S and the amount of movement d of the elevator car 3 C The calculated values ​​are stored. These calculated values ​​allow for the analysis of the operating state of the emergency stop device 11.

[0045] As shown in Figure 3, the torque generated by the motor is increased in multiple stages to a torque T3 that confirms the operation of the emergency stop device 11, thereby suppressing the sheave pulsation associated with the torque increase. This makes it possible to confirm the operation of the emergency stop device 11 in a stable manner. Also, as shown in Figure 3, the torque T is equal to the time t 12 The voltage increases in a ramp-like manner from T1 to T2 over time t 23 The torque is increased in a ramp-like manner from T2 to T3. This further suppresses the pulsation of the sheave associated with the increase in torque.

[0046] Figure 4 is a flowchart showing the operation of the elevator control device 100 in this embodiment during an operational test of the emergency stop device 11.

[0047] In this embodiment, the elevator control device 100 includes a computer system such as a microcomputer, and the computer system executes a predetermined program to perform the processing in the operation test of the emergency stop device 11.

[0048] Steps S2 to S8, described below, are processes performed by the elevator control device 100. Steps S1, S9, and S10 are processes performed by maintenance technicians.

[0049] In step S1, the maintenance technician operates the governor manually or remotely to activate the emergency braking device regardless of whether the elevator car is overspeeding. For example, the maintenance technician operates the governor while the elevator car is stopped, and then lowers the elevator car at a low speed in maintenance operation mode to activate the emergency braking device.

[0050] Next, in step S2, the elevator control device 100 sets the automatic operation mode to the emergency stop device operation confirmation mode using the emergency stop device operation confirmation mode activation unit 102.

[0051] Next, in step S3, the elevator control device 100 uses the initial position storage unit 106 to set an initial value P for the rotational position of the sheave 51. S0 and the initial value P of the basket position C0 Record it.

[0052] Next, in step S4, the elevator control device 100 sets the initial value P of the rotational position of the sheave 51. S0 and the initial value P of the basket position C0 The system determines whether the recording is complete. If the elevator control device 100 determines that it is complete (YES in step S4), it then executes step S5. If it determines that it is not complete (NO in step S4), it executes step S3 again.

[0053] In step S5, the elevator control device 100 starts constant torque control of the motor of the hoisting machine 50 by the motor control unit 101, thereby generating torque in the motor.

[0054] Next, in step S6, the elevator control device 100 calculates the rotational movement d of the sheave 51 for torques T1, T2, and T3 shown in Figure 3, using the sheave movement amount calculation unit 104 and the car movement amount calculation unit 105, respectively. S and the amount of movement d of the elevator car 3 C Calculate.

[0055] Next, in step S7, the elevator control device 100 operates in the emergency stop device operation confirmation mode, that is, it generates torque up to torque T3 to confirm the operation of the emergency stop device 11, and the rotational displacement d of the sheave 51. S and the amount of movement d of the elevator car 3 C The system determines whether the calculation is complete. If the elevator control device 100 determines that it is complete (YES in step S7), it then executes step S8. If it determines that it is not complete (NO in step S7), it executes step S5 again.

[0056] In step S8, the elevator control device 100, using the emergency stop device activation detection unit 103, detects a torque greater than the rated torque for confirming the activation of the emergency stop device, which in this embodiment is the torque T3 (Figure 3), and the rotational displacement d of the sheave 51 calculated in step S6. S and the amount of movement d of the elevator car 3 C Regarding rotational displacement d, S The amount of movement is d C Determine if it is greater than [a certain value].

[0057] The elevator control device 100, S ga d C If it is determined to be greater (YES in step S8), that is, if slack is found in the main rope 2 on the elevator car 3 side, then the maintenance technician performs step S9. The elevator control device 100 then S ga d C Not greater than, i.e., d S ga d C If it is determined that the following is the case (NO in step S8), that is, if no slack is found in the main rope 2 on the elevator car 3 side, then the maintenance technician will perform step S10.

[0058] In step S10, the maintenance technician determines that no slack was found in the main rope 2 in step S8 and that the emergency stop device 11 is not functioning correctly. Therefore, the maintenance technician resets the emergency stop device 11 from its activated state, inspects it, and performs maintenance work such as adjustments on the emergency stop device 11. After performing step S10, the maintenance technician performs step S1 again.

[0059] In step S9, the maintenance technician, having confirmed in step S8 that the main rope 2 was loose and that the emergency stop device 11 was functioning correctly, returns the emergency stop device 11 from its activated state and then operates the maintenance switch or maintenance terminal to return the motor control unit 101 to its normal operating mode. As a result, the elevator control device 100 completes the series of processes.

[0060] According to the above embodiment, the rotational displacement d of the sheave 51 S and the amount of movement d of the elevator car 3 C Based on this, detecting the operating status of the emergency stop device 11 improves the reliability or accuracy of verifying the operation of the emergency stop device.

[0061] It should be noted that the present invention is not limited to the embodiments described above, and various modifications are included. For example, the embodiments described above are described in detail for the purpose of clearly illustrating the present invention, and are not necessarily limited to those having all the configurations described. Furthermore, it is possible to add, delete, or replace some of the configurations of the embodiments with other configurations.

[0062] For example, the elevator system could be a so-called machine-room-less elevator, where the hoisting machine and elevator control device are installed within the hoistway. [Explanation of symbols]

[0063] 1 Hoistway, 2 Main rope, 3 Elevator car, 4 Counterweight, 5 Guide rail, 8 Governor, 9 Tension pulley, 10 Governor rope, 11 Emergency stop device, 12 Operating mechanism, 50 Hoisting machine, 51 Sheave, 52 Direction change pulley, 53 Electromagnetic brake, 100 Elevator control device, 101 Motor control unit, 102 Emergency stop device operation confirmation mode activation unit, 103 Emergency stop device operation detection unit, 104 Sheave movement amount calculation unit, 105 Car movement amount calculation unit, 201 Motor encoder, 202 Governor encoder, 300 Power cable

Claims

1. An elevator emergency stop test device for checking the operating status of an emergency stop device provided by an elevator, With the emergency stop device activated, a motor control unit generates a predetermined torque in the motor of the hoisting machine, An emergency stop device operation detection unit confirms the operating state of the emergency stop device based on the amount of rotational movement of the sheave of the hoisting machine and the amount of movement of the elevator car when the motor generates the predetermined torque, Equipped with, An elevator emergency stop test device characterized in that the emergency stop device operation detection unit determines the operating state of the emergency stop device by comparing the amount of rotational movement of the sheave with the amount of movement of the elevator car.

2. In the elevator emergency stop test device according to claim 1, An elevator emergency stop test device characterized in that the emergency stop device operation detection unit determines that the operation state of the emergency stop device is normal when the amount of rotational movement of the sheave is greater than the amount of movement of the elevator car.

3. An elevator emergency stop test device for checking the operating status of an emergency stop device provided by an elevator, With the emergency stop device activated, a motor control unit generates a predetermined torque in the motor of the hoisting machine, An emergency stop device operation detection unit confirms the operating state of the emergency stop device based on the amount of rotational movement of the sheave of the hoisting machine and the amount of movement of the elevator car when the motor generates the predetermined torque, Equipped with, The elevator emergency stop test device is characterized in that the motor control unit increases the torque generated by the motor in multiple stages up to the predetermined torque.

4. In the elevator emergency stop test device according to Claim 1 or Claim 3, A sheave movement amount calculation unit calculates the rotational movement amount of the sheave based on a signal output by a motor encoder provided on the motor, A car movement amount calculation unit calculates the amount of movement of the elevator car based on a signal output by a governor encoder provided on the governor, An elevator emergency stop test device characterized by comprising the following:

5. In an elevator emergency stop test method for checking the operational status of the emergency stop device installed in an elevator, The emergency stop device is activated, Next, a predetermined torque is generated in the motor of the hoisting machine. An elevator emergency stop test method characterized by determining the operating state of the emergency stop device by comparing the amount of rotational movement of the sheave of the hoisting machine with the amount of movement of the elevator car when the motor generates the predetermined torque, and confirming the operating state of the emergency stop device based on the amount of rotational movement of the sheave and the amount of movement of the elevator car.

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