EP2261161A1 - Elevator device and method of testing the same - Google Patents

Elevator device and method of testing the same Download PDF

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Publication number
EP2261161A1
EP2261161A1 EP08740031A EP08740031A EP2261161A1 EP 2261161 A1 EP2261161 A1 EP 2261161A1 EP 08740031 A EP08740031 A EP 08740031A EP 08740031 A EP08740031 A EP 08740031A EP 2261161 A1 EP2261161 A1 EP 2261161A1
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EP
European Patent Office
Prior art keywords
car
counterweight
suspension means
retention force
drive sheave
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP08740031A
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German (de)
French (fr)
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EP2261161B1 (en
EP2261161A4 (en
Inventor
Atsushi Mitsui
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Priority to PCT/JP2008/056928 priority Critical patent/WO2009125473A1/en
Publication of EP2261161A1 publication Critical patent/EP2261161A1/en
Publication of EP2261161A4 publication Critical patent/EP2261161A4/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/16Braking or catch devices operating between cars, cages, or skips and fixed guide elements or surfaces in hoistway or well
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B66HOISTING; LIFTING; HAULING
    • B66BELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/0087Devices facilitating maintenance, repair or inspection tasks
    • B66B5/0093Testing of safety devices

Abstract

In an elevator apparatus, a car is suspended by suspension means on one side of a drive sheave. A counterweight is suspended by the suspension means on the other side of the drive sheave. A safety device, which is engaged with car guide rails to cause the car to make an emergency stop, is mounted to the car. For conducting a test for verifying actuation of the safety device, a retention force application device applies a retention force less than an unbalanced load of the car and the counterweight to the suspension means on a counterweight side of the drive sheave.

Description

    Technical Field
  • The present invention relates to an elevator apparatus including a car to which a safety device is mounted, and to a testing method for verifying actuation of the safety device.
  • Background Art
  • Generally, in a traction-type elevator apparatus, for conducting a test for verifying actuation of a safety device, a hoisting machine is operated in a direction in which a car descends while the safety device is being actuated. When a drive sheave rotates idly and therefore the car does not descend, it is determined that the safety device actuates normally (for example, see Patent Document 1).
  • In the method for testing the safety device as described above, it is necessary to rotate the drive sheave until a rope exceeds a traction limit to make a complete slip. Therefore, a condition expressed by the following equation is required to be satisfied. W 2 / W 1 Γs
    Figure imgb0001

    Where W1 is a weight of the car, W2 is a weight of a counterweight, and Ts is a traction capacity at the traction limit.
  • Further, assuming that diameter of the drive sheave be D. Then, a torque Ts1 at the drive sheave, which is required to cause the rope slip, is expressed by the following equation. Ts 1 = D / 2 × W 2 - W 1
    Figure imgb0002

    By substituting Equation (1) into Equation (2), the following equation is obtained. Ts 1 = D / 2 × W 2 × 1 - 1 / Γs
    Figure imgb0003

    Therefore, it is understood that the torque required for rotating idly the drive sheave is increased as the weight of the counterweight becomes larger.
  • For example, assuming that a rated load of the elevator apparatus be CAP. Then, an unbalanced torque TO is calculated according to the following equation where W2=W1+0.5CAP. T 0 = D / 2 × W 1 + CAP - W 2 = 0.25 CAP × D
    Figure imgb0004
  • On the other hand, for example, assuming that a shape factor of a rope groove shape (assuming a V-shaped groove at 40°) of the drive sheave be K2=1/sin(40/2)=2.92, a friction coefficient between the drive sheave and the rope be µ=0.2, and a contact angle between the drive sheave and the rope be θ=150°. Then, the following equation is established. Ts 1 = D / 2 × W 2 1 - 1 / e 2.92 × 0.2 × 150 / 180 × n
    Figure imgb0005
    = 0.783 × W 2 × D / 2
    Figure imgb0006
  • Here, assuming that the weight W1 of the car be 1.5×CAP. Then, W2=2.0CAP is obtained (the weight of the rope and the like is not taken into consideration). Therefore, the following equation is established. Ts 1 = 0.783 CAP × D
    Figure imgb0007
  • In comparison between Equation (4) and Equation (6), the torque Ts1 required for rotating idly the drive sheave is about three times as large as the unbalanced torque T0. Thus, even if a torque required for acceleration and deceleration of the car (in general, about twice as large as the unbalanced torque T0) is taken into consideration, a large motor torque is required only for a test for verifying the actuation of the safety device.
  • Moreover, the traction-type elevator apparatus is required to have such performance that the counterweight or the car is not lifted up any more even if the drive sheave is rotated while the car or the counterweight is on a buffer on the bottom of a hoistway after reaching there. As a testing method for verifying the satisfaction of the aforementioned performance condition, there is a method of verifying that the drive sheave rotates idly relative to the rope in the most severe conditions, that is, when the drive sheave is rotated in a direction in which the car ascends after the car is brought into an unloaded state and the counterweight is placed on the buffer.
  • A torque Ts2 required for rotating idly the drive sheave in this test is obtained by the following equation. Ts 2 = D / 2 × W 1 - W 2 = D / 2 × W 1 × 1 - 1 / Γs
    Figure imgb0008

    Here, assuming that W1=1.5CAP. Then, the following equation is established. Ts 2 = 0.587 CAP
    Figure imgb0009
  • The maximum torque required in a state in which the elevator apparatus is operating is a torque expressed by Equation (8) even in consideration of an emergency operation state. The maximum torque is about 75% of the torque required for the test for verifying the actuation of the safety device.
  • Patent Document 1: JP 2007-8611 A
  • Disclosure of the Invention Problem to be solved by the Invention
  • In the conventional elevator apparatus as described above, a large motor torque is required for the test for verifying the actuation of the safety device. Thus, the hoisting machine is disadvantageously increased in size.
  • The present invention has been made to solve the problem described above, and therefore has an object to provide an elevator apparatus capable of reducing a motor torque required for a test for verifying actuation of a safety device to reduce a hoisting machine in size and a testing method for the same.
  • An elevator apparatus according to the present invention includes: a hoisting machine including a drive sheave; suspension means wound around the drive sheave; a car suspended by the suspension means on a first side of the drive sheave; a counterweight suspended by the suspension means on a second side of the drive sheave; a car guide rail for guiding ascent and descent of the car; a safety device mounted to the car, the safety device being engaged with the car guide rail to cause the car to make an emergency stop; and a retention force application device for applying a retention force less than an unbalanced load of the car and the counterweight to the suspension means on the counterweight side of the drive sheave when a test for verifying actuation of the safety device is conducted.
    Further, a method for testing an elevator apparatus, according to the present invention includes: a step of operating a hoisting machine in a direction in which a car ascends while applying a retention force less than an unbalanced load of the car and a counterweight to suspension means suspending the car and the counterweight, on a counterweight side of a drive sheave; a step of actuating a safety device mounted to the car; and a step of operating the hoisting machine in a direction in which the car descends so as to verify whether the drive sheave rotates idly.
  • Brief Description of the Drawings
    • FIG. 1 is a side view illustrating an elevator apparatus according to a first embodiment of the present invention;
    • FIG. 2 is a configuration diagram illustrating a retention force application device illustrated in FIG. 1 in an enlarged manner;
    • FIG. 3 is a side view illustrating an elevator apparatus according to a second embodiment of the present invention;
    • FIG. 4 is a side view illustrating a counterweight illustrated in FIG. 3 in an enlarged manner; and
    • FIG. 5 is a side view illustrating an elevator apparatus according to a third embodiment of the present invention.
    Best Modes for carrying out the Invention
  • Hereinafter, preferred embodiments of the present invention are described with reference to the drawings.
  • First Embodiment
  • FIG. 1 is a side view illustrating an elevator apparatus according to a first embodiment of the present invention. In the drawing, a machine room 2 is provided above a hoistway 1. In the machine room 2, a machine table 3 is provided. A hoisting machine 4 is supported on the machine table 3. The hoisting machine 4 includes a drive sheave 5 and a hoisting machine main body 6. The hoisting machine main body 6 includes a hoisting machine motor for rotating the drive sheave 5 and a hoisting machine brake for braking the rotation of the drive sheave 5.
  • A deflector sheave 7 is mounted on the machine table 3. A plurality of main ropes 8 serving as to suspension means are wound around the drive sheave 5 and the deflector sheave 7. A part of each of the main ropes 8, which is situated on a counterweight 10 side of the drive sheave 5, is wound around the deflector sheave 7. As each of the main ropes 8, for example, a rope having a circular cross section, a belt-like rope, or the like is used.
  • A car 9 is suspended from one end of each of the main ropes 8. In other words, the car 9 is suspended in the hoistway 1 by the main ropes 8 on a first side of the drive sheave 5. The counterweight 10 is suspended from the other end of each of the main ropes 8. In other words, the counterweight 10 is suspended by the main ropes 8 on a second side of the drive sheave 5.
  • In the hoistway 1, a pair of car guide rails 11 for guiding ascent and descent of the car 9 and a pair of counterweight guide rails 12 for guiding ascent and descent of the counterweight 10 are provided. A safety device 13, which is engaged with the car guide rails 11 to cause the car 9 to make an emergency stop, is mounted to the car 9.
  • A retention force application device 14, which applies a predetermined retention force to the main ropes 8 when a test for verifying actuation of the safety device 13 is conducted, is mounted to the machine table 3. The retention force which is applied by the retention force application device 14 to the main ropes 8 is less than an unbalanced load of the car 9 and the counterweight 10. Moreover, the retention force application device 14 applies the retention force to the main ropes 8 on the counterweight 10 side of the drive sheave 5. Further, the retention force application device 14 does not apply the retention force to the main ropes 8 while the elevator apparatus is in service except for a time during which the test for verifying the actuation of the safety device 13 is conducted.
  • FIG. 2 is a configuration diagram illustrating the retention force application device 14 illustrated in FIG. 1 in an enlarged manner. A support member 15 is fixed to the machine table 3. A fixed piece 16 is fixed to the support member 15. A fixed-side friction member 17, which is opposed to the main ropes 8, is fixed to the fixed piece 16. A plurality of guide rods 18a and 18b are provided vertically on the fixed piece 16.
  • A movable piece 19 is supported by the guide rods 18a and 18b. The movable piece 19 is displaceable in a direction in which the movable piece is brought into contact with and separated away from the fixed-side friction member 17 along the guide rods 18a and 18b. A movable-side friction member 20, which is opposed to the main ropes 8, is fixed to the movable piece 19. A plurality of retention force application springs (compression springs) 21a and 21b for biasing the movable piece 19 toward the fixed piece 16 are respectively provided to the guide rods 18a and 18b.
  • Further, stoppermeans (not shown) for keeping the movable-side friction member 20 away from the fixed-side frictionmember 17 against the retention force application springs 21a and 21b is provided between the fixed piece 16 and the movable piece 19. The retention force application device 14 functions as an application brake (rope brake) which releases the stopper means to directly grip (hold) the main ropes 8 between the fixed-side friction member 17 and the movable-side friction member 20 to frictionally brake the main ropes 8 so as to apply the retention force to the main ropes 8 at the time of the test for verifying the actuation of the safety device 13.
  • As described above, the retention force application device 14 is actuated at the time when the test for verifying the actuation of the safety device 13 is conducted or the operation is stopped, and is not operated at the time when a normal operation is performed or an emergency stop is made. Thus, a mechanism for electrical release and actuation, which is required in the case of a normal brake, is not required. Therefore, the stopper means may be configured with a mechanism which is simple enough to be manually operated.
  • Next, a method of conducting the test for verifying the actuation of the safety device 13 is described. First, the stopper means is released so that the retention force application device 14 applies the retention force to the main ropes 8. In this state, the hoisting machine 4 is manually operated in a direction in which the car 9 ascends. As a result, the amount of tension corresponding to the retention force applied by the retention force application device 14, which is included in a total tension of the main ropes 8 on the counterweight 10 side, the main ropes being wound around the drive sheave 5, is reduced.
  • Next, a rope catch of a speed governor is actuated to actuate the safety device 13. After that, the drive sheave 5 is rotated in a direction in which the car 9 descends. Then, it is verified if the drive sheave 5 rotates idly.
  • When the test for verifying the actuation of the safety device 13 is conducted in the procedure described above, the tension of the part of the main ropes 8, which is on the drive sheave 5, is reduced. Therefore, a motor torque required for idle rotation may be reduced. As a result, the hoisting machine 4 may be reduced in size.
  • For example, when it is assumed that the retention force application device 14 has the retention force corresponding to 90% of the unbalanced load (generally corresponding to 50% of a rated load when no passenger is present in the car 9) and a weight of the car 9 is 1.5×CAP, W2=2.0CAP (a weight of the ropes or the like is not taken into consideration) is obtained. Therefore, the torque required for idle rotation is calculated as expressed by the following equation, which shows that the torque may be reduced to 77% as compared with the case where the retention force application device 14 is not used. Ts 1 ʹ = D / 2 × W 2 ʹ × 1 - 1 / Γs = D / 2 × W 2 - 0.5 CAP × 0.9 × 1 - 1 / Γs = 0.607 CAP × D
    Figure imgb0010
  • Note that, if the retention force application device 14 has the retention force equal to or larger than the unbalanced load, there is a likelihood that the car 9 may be prevented from falling with the retention force of the retention force application device 14 even when the safety device 13 does not actuate normally. On the other hand, if the retention force of the retention force application device 14 is less than the unbalanced load, the counterweight 10 moves downward when the hoisting machine brake is released. Therefore, it is proved that the car 9 is not retained by the retention force application device 14.
  • Second Embodiment
  • Next, FIG. 3 is a side view illustrating the elevator apparatus according to a second embodiment of the present invention, and FIG. 4 is a side view illustrating the counterweight 10 illustrated in FIG. 3 in an enlarged manner. In this example, retention force application devices 22 are mounted to an upper part and a lower part of the counterweight 10. A configuration of each of the retention force application devices 22 is the same as that of the retention force application device 14 illustrated in FIG. 2. However, the fixed piece 16 is fixed to the counterweight 10. In addition, the fixed-side friction member 17 and the movable-side friction member 20 hold the counterweight guide rails 12 therebetween.
  • The retention force application devices 22 of the second embodiment hold the counterweight guide rails 12 to frictionally brake the counterweight 10 when the test for verifying the actuation of the safety device 13 is conducted. In this manner, the retention force less than the unbalanced load is applied to the main ropes 8 on the counterweight 10 side of the drive sheave 5. The remaining structure and testing method are the same as those described in the first embodiment.
  • Even with the structure and testing method described above, the tension of the part of the main ropes 8, which is on the drive sheave 5, is reduced. Therefore, the motor torque required for idle rotation may be reduced. As a result, the hoisting machine 4 may be reduced in size.
  • Third Embodiment
  • Next, FIG. 5 is a side view illustrating the elevator apparatus according to a third embodiment of the present invention. In the drawing, a retention force application device 23 is provided to the deflector sheave 7. The retention force application device 23 brakes the rotation of the deflector sheave 7 so as to apply the retention force less than the unbalanced load to the main ropes 8 on the counterweight 10 side of the drive sheave 5 when the test for verifying the actuation of the safety device 13 is conducted. The remaining structure and testing method are the same as those described in the first embodiment.
  • Even with the structure and testing method described above, the tension of the part of the main ropes 8, which is on the drive sheave 5, is reduced. Therefore, the motor torque required for idle rotation may be reduced. As a result, the hoisting machine 4 may be reduced in size.
  • Note that, in some cases, the required effects are not obtained because the main ropes 8 slip due to a small contact angle of the main ropes 8 with respect to the deflector sheave 7 even when the rotation of the deflector sheave 7 is braked. In such cases, a groove surface of the deflector sheave 7, into which the main ropes 8 are inserted, may be made of a highly frictional material. Alternatively, the deflector sheave 7 may be braked directly at a portion with which the main ropes 8 are brought into contact. Specifically, the main ropes 8 may be held between the retention force application device 23 and the deflector sheave 7. Further, for conducing the test for verifying the actuation of the safety device 13, a highly frictional material may be wound around the part of the main ropes 8, which is in contact with the deflector sheave 7.
  • Although the 1:1 roping elevator apparatus has been described in the aforementioned examples, the elevator apparatus is not limited thereto. The present invention is also applicable to, for example, a 2:1 roping elevator apparatus.

Claims (8)

  1. An elevator apparatus, comprising:
    a hoisting machine including a drive sheave;
    suspension means wound around the drive sheave;
    a car suspended by the suspension means on a first side of the drive sheave;
    a counterweight suspended by the suspension means on a second side of the drive sheave;
    a car guide rail for guiding ascent and descent of the car;
    a safety device mounted to the car, the safety device being engaged with the car guide rail to cause the car to make an emergency stop; and
    a retention force application device for applying a retention force less than an unbalanced load of the car and the counterweight to the suspension means on a counterweight side of the drive sheave when a test for verifying actuation of the safety device is conducted.
  2. An elevator apparatus according to claim 1, wherein the retention force application device directly grips the suspension means to frictionally brake the suspension means, to thereby apply the retention force to the suspension means.
  3. An elevator apparatus according to claim 1, further a comprising counterweight guide rail for guiding ascent and descent of the counterweight,
    wherein the retention force application device is mounted to the counterweight and frictionally brakes the counterweight against the counterweight guide rail, to thereby apply the retention force to the suspension means.
  4. An elevator apparatus according to claim 1, further comprising a deflector sheave around which a part of the suspension means on the counterweight side of the drive sheave is wound,
    wherein the retention force application device brakes rotation of the deflector sheave, to thereby apply the retention force to the suspension means.
  5. An elevator apparatus according to claim 4, wherein the deflector sheave has a groove surface made of a highly frictional material, with which the suspension means to be wound around is brought into contact.
  6. An elevator apparatus according to claim 4, wherein the retention force application device and the deflector sheave hold the suspension means therebetween.
  7. An elevator apparatus according to claim 4, further comprising a highly frictional material wound around the part of the suspension means, the part being brought into contact with the deflector sheave, when the test for verifying the actuation of the safety device is conducted.
  8. A method for testing an elevator apparatus, comprising:
    a step of operating a hoisting machine in a direction in which a car ascends while applying a retention force less than an unbalanced load of the car and a counterweight to suspension means suspending the car and the counterweight, on a counterweight side of a drive sheave;
    a step of actuating a safety device mounted to the car; and
    a step of operating the hoisting machine in a direction in which the car descends so as to verify whether the drive sheave rotates idly.
EP08740031.3A 2008-04-08 2008-04-08 Elevator device and method of testing the same Not-in-force EP2261161B1 (en)

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PCT/JP2008/056928 WO2009125473A1 (en) 2008-04-08 2008-04-08 Elevator device and method of testing the same

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EP2261161A1 true EP2261161A1 (en) 2010-12-15
EP2261161A4 EP2261161A4 (en) 2014-08-06
EP2261161B1 EP2261161B1 (en) 2015-01-21

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JP (1) JP5174894B2 (en)
KR (1) KR101199046B1 (en)
CN (1) CN101932520B (en)
WO (1) WO2009125473A1 (en)

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JP2021134042A (en) * 2020-02-27 2021-09-13 株式会社日立製作所 Testing method and power source for testing for emergency elevator stop

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CN109952262B (en) * 2016-11-21 2020-06-23 三菱电机株式会社 Method for inspecting emergency stop device of elevator
JP6394849B1 (en) * 2018-04-10 2018-09-26 三菱電機ビルテクノサービス株式会社 Elevator control device that allows the car to function as a scaffold
JP6452925B1 (en) * 2018-05-09 2019-01-16 三菱電機株式会社 Test method for elevator device and safety device

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EP2261161A4 (en) 2014-08-06
KR101199046B1 (en) 2012-11-07
JPWO2009125473A1 (en) 2011-07-28
JP5174894B2 (en) 2013-04-03
CN101932520B (en) 2012-10-03
KR20100094594A (en) 2010-08-26
CN101932520A (en) 2010-12-29
WO2009125473A1 (en) 2009-10-15
EP2261161B1 (en) 2015-01-21

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