Elevator emergency stop test device and elevator emergency stop test method

Abstract

The invention discloses an elevator emergency stop test device and an emergency stop test method capable of improving reliability or precision of action confirmation of an emergency stop device. The elevator emergency stop test device confirms the working state of an emergency stop device of an elevator, and comprises a motor control part (101) which enables a motor of a traction machine (50) to generate a specified torque in a state of enabling the emergency stop device to work, and a motor control part (102) which enables the motor of the traction machine (50) to generate a specified torque in a state of enabling the emergency stop device to work; and an emergency stop device operation detection unit (103) that confirms the operation state of the emergency stop device on the basis of the rotational movement amount (dS) of a sheave provided in the hoist and the movement amount (dC) of the car when the motor generates a predetermined torque.

Description

Technical Field

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

[0002] In order to make an emergency stop of the car that falls into a specified overspeed state, a speed governor and an emergency stop device are provided in the elevator device. The car and the speed governor are coupled through the speed governor rope. When an overspeed state is detected, the speed governor tightens the speed governor rope to operate the emergency stop device on the car side, thereby making the car stop urgently.

[0003] Such an emergency stop device is subjected to an operation test during installation of the elevator or during maintenance and inspection to confirm the operating status.

[0004] As a conventional technology related to the emergency stop test, the technology described in Patent Document 1 is known.

[0005] In this prior art, the speed governor is intentionally operated by remote control or the like, regardless of the overspeed state of the car, so that the emergency stop device is actuated. In addition, the counterweight is lifted by a hydraulic jack, so that the main rope between the drive sheave and the counterweight is loosened. Then, the brake is released to rotate the drive sheave, so that the slack in the main rope on the counterweight side is transferred to the main rope between the drive sheave and the car. At this time, it is visually confirmed from the landing side that the descent of the car is suppressed and the main rope on the car side is loosened. Prior art literature Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2008-189430 Summary of the invention Technical problem to be solved by the invention

[0007] In the above-mentioned prior art, the descent suppression of the car and the slack of the main rope are confirmed by visual inspection or the like, and it is difficult to confirm the operation with high reliability or high accuracy.

[0008] Therefore, the present invention provides an elevator emergency stop test device and an emergency stop test method which can improve the reliability or accuracy of the action confirmation of the emergency stop device. Technical means for solving technical problems

[0009] In order to solve the above-mentioned problem, the elevator emergency stop test device of the present invention is used to confirm the working status of the emergency stop device of the elevator, including: a motor control unit, which makes the motor of the traction machine generate a specified torque when the emergency stop device is in operation; and an emergency stop device operation detection unit, which confirms the working status of the emergency stop device based on the rotational movement of the rope wheel of the traction machine and the movement of the car when the motor generates the specified torque.

[0010] In order to solve the above-mentioned problem, the elevator emergency stop test method of the present invention is used to confirm the working status of the emergency stop device of the elevator. It makes the emergency stop device work, and then makes the motor of the traction machine generate a specified torque. Based on the rotational movement of the rope wheel of the traction machine and the movement of the car when the motor generates the specified torque, the working status 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, structures, and effects other than those described above will become more apparent from the following description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a simplified structural diagram of an elevator device according to an embodiment. Figure 2 This is a functional block diagram showing the structure of the elevator control device in the embodiment. Figure 3 is a figure showing the motor control unit 101 ( Figure 2 ) Waveform diagram of the torque command value in the torque control performed during the working test of the emergency stop device. Figure 4 This is a flow chart showing the operation of the elevator control device in the embodiment during the operation test of the emergency stop device. DETAILED DESCRIPTION

[0014] Hereinafter, the embodiments of the present invention will be described with reference to the accompanying drawings. In each of the drawings, components with the same reference numerals represent the same components or components having similar functions.

[0015] Figure 1 This is a schematic structural diagram of an elevator device as one embodiment of the present invention.

[0016] like Figure 1As shown, a car 3 and a counterweight 4 are connected to one end and the other end of a main rope 2, respectively. The main rope 2 is wound around a sheave 51 and a direction conversion pulley 52 of a traction machine 50. Thus, the car 3 and the counterweight 4 are suspended in the hoistway 1.

[0017] The motor provided in the traction 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 car 3 and the counterweight 4 move in the vertically opposite directions in the hoistway 1. The car 3 moves guided by the car guide rail 5, and the counterweight 4 also moves 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 applied as the motor. Therefore, the motor is driven by the three-phase alternating current supplied from the elevator control device 100 via the cable 300.

[0019] The hoisting machine 50 includes an electromagnetic brake 53. When the car 3 is stopped, the electromagnetic brake 53 brakes the rotation of the hoisting machine 50. As the electromagnetic brake 53, for example, a disc type electromagnetic brake is suitable.

[0020] In this embodiment, the traction machine 50 includes a plurality of ( Figure 1 The plurality of electromagnetic brakes 53 are always in operation and constitute a multi-system brake ( Figure 1 (The middle one is a dual system brake).

[0021] The emergency stop device 11 is provided at the lower part of the car 3. The emergency stop device 11 is operated when the car 3 becomes overspeed, and clamps the guide rail 5 with a pair of brakes (not shown), and decelerates the car 3 by the friction force acting between the brakes and the guide rail 5, thereby making it an emergency stop.

[0022] In the machine room installed on the hoistway 1, in addition to the traction machine 50 and the elevator control device 100, a speed governor 8 is also installed to operate the emergency stop device 11. An endless speed governor rope 10 is wound around the pulley of the speed governor 8. The speed governor rope 10 is also wound around a tensioning wheel 9 located at the lower part of the hoistway 1 and applying tension to the speed governor rope 10.

[0023] The speed governor rope 10 is engaged with the emergency stop device 11 via the operating mechanism 12. Therefore, since the speed governor rope 10 is driven by the movement of the car 3, the pulley of the speed governor 8 rotates. The speed governor 8 includes a holding mechanism that holds the speed governor rope 10 and stops the movement of the speed governor rope 10 when the descending speed of the car 3 exceeds a specified value (for example, a speed not exceeding 1.4 times the rated speed). The speed governor 8 includes a vibrator mechanism that rotates together with the pulley. The vibrator mechanism is driven by centrifugal force, and when the descending speed of the car 3 exceeds a specified value, the holding mechanism is operated to operate.

[0024] When the movement of the speed governor rope 10 is stopped by the speed governor 8, the operating mechanism 12 engages with the speed governor rope 10, and thus stops moving together with the speed governor rope 10. In addition, at this time, the car 3 continues to descend. Therefore, the operating mechanism 12 moves upward relative to the car 3. As a result, the operating mechanism 12 operates the emergency stop device 11 to operate. Therefore, the car 3 is decelerated and stopped in an emergency.

[0025] When the operation test of the emergency stop device 11 is performed as described above, the elevator control device 100 controls the motor provided in the traction machine 50 to generate a predetermined torque while the emergency stop device 11 is in operation. At this time, the elevator control device 100 controls the motor so that a predetermined torque greater than the rated torque is generated in the direction in which the car 3 descends, that is, in the direction in which a pair of brakes (not shown) in the emergency stop device 11 engage 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 movement of the car 3 in the descending direction 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 amount of the sheave 51 based on the rotational position detection signal of the motor encoder 201. In addition, the elevator control device 100 calculates the movement amount of the car 3 based on the rotational position detection signal of the speed governor encoder 202.

[0028] The elevator control device 100 compares the calculated rotational movement amount of the sheave 51 and the movement amount of the car 3. When the rotational movement amount of the sheave 51 is larger, it is determined that the emergency stop device 11 is operating normally. The rotational movement amount of the sheave 51 is equivalent to the movement length of the main rope 2 to the car 3 side. Therefore, when the rotational movement amount of the sheave 51 is larger, the movement length of the main rope 2 is greater than the movement amount of the car. In other words, the main rope 2 is slack on the car side. Such slackness of the main rope 2 indicates that the car 3 is normally stopped by the emergency stop device 11.

[0029] The elevator control device 100 usually controls the operation of the car 3 according to the rotation position detection signal of the speed governor encoder 201. In the present embodiment, the speed governor encoder 202 is usually used for overspeed detection of the car. The safety control device not shown detects the speed of the car 3 based on the rotation position detection signal of the speed governor encoder 202. When the detected speed exceeds the specified overspeed (for example, a speed not exceeding 1.3 times the rated speed), the power supply is cut off to make the car 3 stop urgently. The speed governor encoder 202 can also be installed on the speed governor 8 during the working test of the emergency stop device 11.

[0030] Figure 2 This is a functional block diagram showing the structure 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 input 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 the normal operation mode, the motor control unit 101 controls the motor of the hoisting machine 50 and the electromagnetic brake 53 to run and stop the car according to the call registered by the elevator user.

[0033] When the emergency stop device operation confirmation mode access unit 102 implements the operation test of the emergency stop device 11, the operation mode of the motor control unit 101 is switched from the normal operation mode to the emergency stop device operation confirmation mode. In the emergency stop device operation confirmation mode, the motor control unit 101 releases the electromagnetic brake 53 while the emergency stop device 11 is operating, and performs torque control of the motor according to the torque command value described later, so that the motor of the traction machine 50 generates a specified torque. The torque command value is provided to the motor control unit 101 by the emergency stop device operation confirmation mode access unit 102, or the motor control unit 101 holds it in advance and is activated in the emergency stop device operation confirmation mode.

[0034] The emergency stop device operation confirmation mode access unit 102 is activated by a maintenance technician operating a maintenance switch provided in the elevator control device 100 or a maintenance terminal communicatively connected to the elevator control device 100, and sets the operation 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 dS of the sheave 51 based on the rotational position detection signal S1 outputted from the motor encoder 201 .

[0036] The car movement amount calculation unit 105 calculates the movement amount dC of the car 3 based on the rotation position detection signal S2 output by the speed governor encoder 202 .

[0037] The emergency stop device operation detection unit 103 detects that the emergency stop device 11 is operating based on the rotational movement amount dS of the sheave 51 calculated by the sheave movement amount calculation unit 104 and the movement amount dC of the car 3 calculated by the car movement amount calculation unit 105 .

[0038] The initial position storage unit 106 records the initial value PS0 of the rotation position of the sheave 51 and the initial value PC0 of the car position. These initial values ​​PS0 and PC0 are the values ​​immediately before the working test of the emergency stop device 11 begins. When the working test begins, 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 calculates and stores the rotation position of the sheave 51 and the car position during the operation test of the emergency stop device 11 based on these initial values ​​PS0, PC0, the rotation movement amount dS of the sheave 51 and the movement amount dC of the car 3. In this embodiment, each movement amount is detected based on 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] Figure 3 is a figure showing the motor control unit 101 ( Figure 2 ) is a waveform diagram of the torque command value in the torque control performed during the operation test of the emergency stop device 11.

[0041] exist Figure 3 In the embodiment of FIG. 1 , the torque T is represented by a pu value based on the rated torque (=1).

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

[0043] The motor control unit 101 Figure 3 The torque command value shown in the figure is used to perform control, and during the period when the motor generates torque, that is, during Figure 3 In t1 to t3, the sheave movement amount calculation unit 104 ( Figure 2 ) calculates the rotational movement amount dS of the sheave 51, and the car movement amount calculation unit 105 ( Figure 2 ) Calculate the movement amount dC of car 3.

[0044] Emergency stop device operation detection unit 103 ( Figure 2) determines whether the emergency stop device 11 is operating normally based on the rotational movement amount dS of the sheave 51 and the movement amount dC of the car 3 when the motor generates the torque T3. The emergency stop device operation detection unit 103 ( Figure 2 ) stores the calculated values ​​of the rotational movement amount dS of the sheave 51 and the movement amount dC of the car 3 when the motor generates torques T1, T2, and T3. The operating state of the emergency stop device 11 can be analyzed through these calculated values.

[0045] according to Figure 3 By increasing the torque generated by the motor to the torque T3 for confirming the operation of the emergency stop device 11 in multiple stages, the pulsation of the rope wheel accompanying the increase in torque can be suppressed. Therefore, the operation of the emergency stop device 11 can be stably confirmed. Figure 3 As shown, the torque T increases from T1 to T2 in a ramp shape during time t12, and increases from T2 to T3 in a ramp shape during time t23. This can further suppress the pulsation of the sheave accompanying the increase in torque.

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

[0047] In the present 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 executed by the elevator control device 100. Steps S1, S9, and S10 are processes executed by a maintenance engineer.

[0049] In step S1, the maintenance technician activates the speed governor by manual or remote operation, so that the emergency stop device operates regardless of the overspeed state of the car. For example, after the maintenance technician activates the speed governor in the stopped state of the car, the emergency stop device is operated by descending the car at a low speed in the maintenance operation mode.

[0050] Next, in step S2, the elevator control device 100 sets its own operation mode to the emergency stop device operation confirmation mode via the emergency stop device operation confirmation mode input unit 102.

[0051] Next, in step S3, the elevator control device 100 records the initial value PS0 of the rotation position of the sheave 51 and the initial value PC0 of the car position in the initial position storage unit 106.

[0052] Next, in step S4, the elevator control device 100 determines whether the recording of the initial value PS0 of the rotation position of the pulley 51 and the initial value PC0 of the car position is completed. When the elevator control device 100 determines that it is completed (step S4 is "yes"), step S5 is then executed. When it is determined that it is not completed (step S4 is "no"), step S3 is executed again.

[0053] In step S5, the elevator control device 100 starts the constant torque control of the motor of the hoisting machine 50 by the motor control unit 101, and causes the motor to generate torque.

[0054] Next, in step S6, the elevator control device 100 Figure 3 The torques T1, T2, and T3 shown are used to calculate the rotational movement amount dS of the sheave 51 and the movement amount dC of the car 3 by the sheave movement amount calculation unit 104 and the car movement amount calculation unit 105, respectively.

[0055] Next, in step S7, the elevator control device 100 determines whether the operation in the emergency stop device operation confirmation mode, that is, the generation of torque until the torque T3 for confirming the operation of the emergency stop device 11 and the calculation of the rotational movement amount dS of the sheave 51 and the movement amount dC of the car 3 are completed. When the elevator control device 100 determines that it is completed (step S7 is "yes"), step S8 is then executed, and when it is determined that it is not completed (step S7 is "no"), step S5 is executed again.

[0056] In step S8, the elevator control device 100 uses the emergency stop device operation detection unit 103 to detect the torque for confirming the operation of the emergency stop device which is larger than the rated torque, which is the torque T3 (in this embodiment). Figure 3 ), with respect to the rotational movement amount dS of the sheave 51 and the movement amount dC of the car 3 calculated in step S6, it is determined whether the rotational movement amount dS is greater than the movement amount dC.

[0057] When the elevator control device 100 determines that dS is greater than dC (step S8 is "yes"), that is, when it is confirmed that the main rope 2 on the car 3 side is slack, the maintenance technician then performs step S9. When the elevator control device 100 determines that dS is not greater than dC, that is, dS is less than dC (step S8 is "no"), that is, it cannot be confirmed that the main rope 2 on the car 3 side is slack, the maintenance technician then performs step S10.

[0058] In step S10, the maintenance technician did not confirm the slack of the main rope 2 in step S8 and believed that the emergency stop device 11 was not working properly, so the emergency stop device 11 was restored from the working state and checked, and the emergency stop device 11 was adjusted and other maintenance operations were performed. After executing step S10, the maintenance technician executes step S1 again.

[0059] In step S9, the maintenance technician confirms that the main rope 2 is loose in step S8 and believes that the emergency stop device 11 is working normally. Therefore, after the emergency stop device 11 is restored from the working state, the operation mode of the motor control unit 101 is returned to the normal operation mode, and the maintenance switch or the maintenance terminal is operated. Thus, the elevator control device 100 ends a series of processing.

[0060] According to the above embodiment, the operating state of the emergency stop device 11 is detected based on the rotational movement amount dS of the sheave 51 and the movement amount dC of the car 3, thereby improving the reliability or accuracy of the operation confirmation of the emergency stop device.

[0061] The present invention is not limited to the above-mentioned embodiments, but also includes various modifications. For example, the above-mentioned embodiments are detailed descriptions for the purpose of explaining the present invention in an understandable manner, and the present invention is not necessarily limited to including all the structures described. In addition, for a part of the structure of the embodiment, other structures can be added, deleted, or replaced.

[0062] For example, the elevator apparatus may be a so-called machine-room-less elevator in which a traction machine or an elevator control apparatus is installed in a hoistway. Description of symbols

[0063] 1 hoistway, 2 main rope, 3 car, 4 counterweight, 5 guide rail, 8 speed governor, 9 tensioning pulley, 10 speed governor rope, 11 emergency stop device, 12 operating mechanism, 50 traction machine, 51 sheave, 52 direction conversion pulley, 53 electromagnetic brake, 100 elevator control device, 101 motor control unit, 102 emergency stop device operation confirmation mode access unit, 103 emergency stop device operation detection unit, 104 sheave movement amount calculation unit, 105 car movement amount calculation unit, 201 motor encoder, 202 speed governor encoder, 300 cable.

Claims

1. An elevator emergency stop test device, which confirms the working status of the emergency stop device of the elevator, characterized in that: include: a motor control unit configured to cause the motor provided in the hoisting machine to generate a predetermined torque in a state where the emergency stop device is in operation; as well as An emergency stop device operation detection unit confirms an operation state of the emergency stop device based on a rotational movement amount of a sheave provided in the hoisting machine and a movement amount of a car when the electric motor generates the predetermined torque.

2. The elevator emergency stop test device according to claim 1, characterized in that: include: a sheave movement amount calculation unit for calculating the rotational movement amount of the sheave based on a signal output by a motor encoder provided on the motor; as well as A car movement amount calculation unit calculates the movement amount of the car based on a signal output from a speed governor encoder provided on the speed governor.

3. The elevator emergency stop test device according to claim 1, characterized in that: The emergency stop device operation detection unit determines the operation state of the emergency stop device by comparing the rotational movement amount of the sheave and the movement amount of the car.

4. The elevator emergency stop test device according to claim 3, characterized in that: The emergency stop device operation detection unit determines that the operation state of the emergency stop test device is normal when the rotational movement amount of the sheave is greater than the movement amount of the car.

5. The elevator emergency stop test device according to claim 1, characterized in that: The motor control unit increases the torque generated by the motor to the predetermined torque in a plurality of stages.

6. An elevator emergency stop test method, which confirms the working status of the emergency stop device of the elevator, characterized in that: The emergency stop device is operated. Next, the electric motor of the traction machine is caused to generate a predetermined torque. The operating state of the emergency stop device is confirmed based on the rotational movement amount of the sheave provided in the hoisting machine and the movement amount of the car when the electric motor generates the predetermined torque.

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