EP2383216A1 - Dispositif d'ascenseur - Google Patents

Dispositif d'ascenseur Download PDF

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Publication number
EP2383216A1
EP2383216A1 EP09839159A EP09839159A EP2383216A1 EP 2383216 A1 EP2383216 A1 EP 2383216A1 EP 09839159 A EP09839159 A EP 09839159A EP 09839159 A EP09839159 A EP 09839159A EP 2383216 A1 EP2383216 A1 EP 2383216A1
Authority
EP
European Patent Office
Prior art keywords
car
rotating shaft
driven shaft
speed governor
speed
Prior art date
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.)
Withdrawn
Application number
EP09839159A
Other languages
German (de)
English (en)
Inventor
Mineo Okada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2383216A1 publication Critical patent/EP2383216A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed
    • B66B5/044—Mechanical overspeed governors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B5/00—Applications of checking, fault-correcting, or safety devices in elevators
    • B66B5/02—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions
    • B66B5/04—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions for detecting excessive speed

Definitions

  • the present invention relates to an elevator apparatus that has a car that is moved inside a hoistway.
  • elevator apparatuses that operate a speed governor to make a car perform an emergency stop if a car speed exceeds a predetermined set overspeed.
  • the set overspeed at which the speed governor operates is equal whether the direction of movement of the car is an ascending direction or a descending direction.
  • the present invention aims to solve the above problems and an object of the present invention is to provide an elevator apparatus that enables a set overspeed of a speed governor to be different during ascent and during descent of a car, that enables cost reductions to be achieved, and that also enables size reductions to be achieved.
  • an elevator apparatus characterized in including: a car that can be moved inside a hoistway; and a speed governor including: a rotating shaft that rotates in response to movement of the car; a centrifugal weight that revolves around the rotating shaft together with the rotation of the rotating shaft; an extensible arm that links the centrifugal weight to the rotating shaft, and that is displaced relative to the rotating shaft in response to a centrifugal force to which the centrifugal weight is subjected due to the revolution; and a displacement setting apparatus that extends and retracts the extensible arm to set a length of the extensible arm to different lengths during normal rotation and during reverse rotation of the rotating shaft, the speed governor detecting presence or absence of an abnormality in a speed of the car based on the displacement of the extensible arm relative to the rotating shaft.
  • FIG. 1 is a structural diagram that shows an elevator apparatus according to Embodiment 1 of the present invention.
  • a machine room 2 is disposed in an upper portion of a hoistway 1.
  • a hoisting machine (a driving machine) 4 that has a driving sheave 3; a deflecting sheave 5 that is disposed so as to be positioned at a distance from the driving sheave 3; and a controlling apparatus 6 that controls elevator operation.
  • a common main rope 7 is wound around the drive sheave 3 and the deflecting sheave 5.
  • a car 8 and a counterweight 9 that can be raised and lowered inside the hoistway 1 are suspended by the main rope 7.
  • the car 8 and the counterweight 9 are raised and lowered inside the hoistway 1 by rotation of the drive sheave 3.
  • the car 8 and the counterweight 9 are raised and lowered inside the hoistway 1, the car 8 is guided by car guide rails (not shown), and the counterweight 9 is guided by counterweight guide rails (not shown).
  • An emergency stopper apparatus 10 that stops falling of the car 8 is disposed on a lower portion of the car 8.
  • An operating arm 11 is disposed on the emergency stopper apparatus 10.
  • the emergency stopper apparatus 10 grips the car guide rails on operation of the operating arm 11. Movement of the car 8 is stopped by gripping of the car guide rails by the emergency stopper apparatus 10.
  • a speed governor 12 is disposed inside the machine room 2, and a tensioning sheave 13 is disposed in a lower portion inside the hoistway 1.
  • the speed governor 12 has: a speed governor main body 14; and a speed governor sheave 15 that is disposed on the speed governor main body 14.
  • a speed governor rope 16 is wound around the speed governor sheave 15 and the tensioning sheave 13.
  • a first end portion and a second end portion of the speed governor rope 16 are connected to the operating arm 11.
  • the speed governor sheave 15 and the tensioning sheave 13 are thereby rotated in response to movement of the car 8.
  • the speed governor sheave 15 and the tensioning sheave 13 are rotated normally by ascent of the car 8, and are rotated in reverse by descent of the car 8.
  • the speed governor main body 14 grips the speed governor rope 16 if rotational speed of the speed governor sheave 15 reaches a predetermined set overspeed.
  • the operating arm 11 is operated by the speed governor rope 16 being gripped by the speed governor main body 14 and the car 8 being displaced relative to the speed governor rope 16.
  • a car buffer 17 that is positioned below the car 8, and a counterweight buffer 18 that is positioned below the counterweight 9 are disposed in a bottom portion (a pit) of the hoistway 1.
  • the car buffer 17 relieves mechanical shock that is imparted to the car 8.
  • the counterweight buffer 18 relieves mechanical shock that is imparted to the counterweight 9.
  • Figure 2 is a longitudinal cross section that shows the speed governor 12 from Figure 1 .
  • Figure 3 is a longitudinal cross section that shows a state in which extensible arms of the speed governor 12 from Figure 2 are extended.
  • Figure 4 is a front elevation that shows the speed governor 12 from Figure 2 .
  • the speed governor 12 is supported by a supporting body 19.
  • the speed governor main body 14 has: a sheave interlocking device 20 that operates interdependently with the speed governor sheave 15 in response to rotational speed of the speed governor sheave 15; an overspeed detecting switch 21 that outputs a stopping signal that stops elevator operation on being activated by the sheave interlocking device 20; and a gripping apparatus 22 that grips the speed governor rope 16 on being activated by the sheave interlocking device 20 ( Figure 4 ).
  • a sheave shaft 23 of the speed governor sheave 15 is supported horizontally in the supporting body 19 by means of bearings 24.
  • a driving bevel gear 25 is fixed to an end portion of the sheave shaft 23.
  • the sheave interlocking device 20 has: a driven shaft (a rotating shaft) 26 that is disposed so as to be parallel to a vertical direction; a driven bevel gear 27 that is fixed to a lower end portion of the driven shaft 26, and that intermeshes with the driving bevel gear 25; a displacing body 28 that is disposed on the driven shaft 26, and that is displaceable relative to the driven shaft 26 in a direction that is parallel to the driven shaft 26; a centrifugally displacing apparatus 29 that displaces the displacing body 28 in response to the rotation of the driven shaft 26; and a displacement setting apparatus 30 that can set the centrifugally displacing apparatus 29 such that a relationship between the rotational speed of the driven shaft 26 and displacement of the displacing body 28 is different during normal rotation and during reverse rotation of the driven shaft 26.
  • the driven shaft 26 is supported by the supporting body 19 so as to have a bearing 31 interposed.
  • the rotation of the sheave shaft 23 is transmitted to the driven shaft 26 by means of the driving bevel gear 25 and the driven bevel gear 27. Consequently, the driven shaft 26 is rotated in response to the rotation of the speed governor sheave 15. Specifically, the driven shaft 26 is rotated normally during normal rotation of the speed governor sheave 15, and is rotated in reverse during reverse rotation of the speed governor sheave 15.
  • the centrifugally displacing apparatus 29 is disposed on an upper portion of the driven shaft 26.
  • the centrifugally displacing apparatus 29 is rotated together with the driven shaft 26.
  • the centrifugally displacing apparatus 29 has: a pair of fly balls (centrifugal weights) 32 that revolve around the driven shaft 26 together with the rotation of the driven shaft 26; a pair of extensible arms 33 that respectively link each of the fly balls 32 to an upper end portion of the driven shaft 26, and that can pivot relative to the driven shaft 26; a sliding cylinder 34 that is passed slidably over the driven shaft 26; linking members 35 that link the respective extensible arms 33 and the sliding cylinder 34; and a balancing spring 36 that forces the sliding cylinder 34 downward.
  • the fly balls 32 are subjected to centrifugal forces that correspond to the rotational speed of the driven shaft 26 by revolving around the driven shaft 26.
  • the extensible arms 33 are displaced by pivoting relative to the driven shaft 26 in response to the centrifugal forces to which the fly balls 32 are subjected.
  • the sliding cylinder 34 is displaced in a direction that is parallel to the driven shaft 26 in response to the displacement of the respective extensible arms 33 relative to the driven shaft 26.
  • the extensible arms 33 are displaced in a direction in which the fly balls 32 move away from each other, and the sliding cylinder 34 is displaced upward in opposition to force from the balancing spring 36.
  • the rotational speed of the driven shaft 26 decreases, the extensible arms 33 are displaced in a direction in which the fly balls 32 move toward each other, and the sliding cylinder 34 is displaced downward by the force from the balancing spring 36.
  • the extensible arms 33 each have: an arm main body 37 that is mounted so as to be able to pivot relative to the driven shaft 26; and an actuator 38 that is disposed on the arm main body 37, and that changes the length of the extensible arm 33.
  • the actuators 38 have: plungers 39 that are displaceable relative to the arm main bodies 37; and electromagnetic coils 40 that displace the plungers 39 relative to the arm main bodies 37.
  • the fly balls 32 are mounted to the plungers 39.
  • the plungers are displaceable between an extended position ( Figure 3 ) that is away from the arm main body 37; and a retracted position ( Figure 2 ) that is closer to the arm main body 37 than the extended position. Length of the extensible arms 33 is changed by the plungers 39 being displaced between the extended position and the retracted position.
  • the plungers are displaced to the extended position by passing electric current to the electromagnetic coils 40, and are displaced to the retracted position by forces from forcing bodies (not shown) when the passage of electric current to the electromagnetic coils 40 is stopped.
  • the displacing body 28 is displaceable together with the sliding cylinder 34.
  • the displacing body 28 is thereby displaced in a direction that is parallel to the driven shaft 26 in response to the rotational speed of the speed governor sheave 15.
  • the displacing body 28 is also rotatable relative to the sliding cylinder 34 and the driven shaft 26. Consequently, the displacing body 28 is not rotated even if the sliding cylinder 34 and the driven shaft 26 are rotated.
  • the displacing body 28 has: a driven tube 41 that is passed slidably over the driven shaft 26; and an operating portion 42 that protrudes outward from an outer circumferential surface of the driven tube 41.
  • the displacement setting apparatus 30 extends and retracts the respective extensible arms 33 to set the length of the respective extensible arms 33 to different lengths during normal rotation and during reverse rotation of the driven shaft 26. Specifically, the displacement setting apparatus 30 makes the relationship between the rotational speed of the driven shaft 26 and displacement of the displacing body 28 different during normal rotation and during reverse rotation of the driven shaft 26 by making the orbital radius of the fly balls 32 different during normal rotation and during reverse rotation of the driven shaft 26.
  • the displacement setting apparatus 30 shortens the length of the extensible arms 33 during normal rotation of the driven shaft 26 (i.e., during ascent of the car 8), and makes the length of the extensible arms 33 longer than during normal rotation of the driven shaft 26 during reverse rotation of the driven shaft 26 (i.e., during descent of the car 8).
  • the displacement setting apparatus 30 has: a generator 43 that generates electric power from the rotation of the driven shaft 26; and a rectifying apparatus 44 that sends electric power to the electromagnetic coils 40 from the electric power that is generated by the generator 43 either only during normal rotation or only during reverse rotation of the driven shaft 26.
  • the generator 43 is disposed on an upper end portion of the driven shaft 26.
  • the generator 43 is assumed to be a direct-current generator.
  • the generator 43 has: a generator fixed shaft 45 that includes permanent magnets; and a generator main body 46 that includes a power generating coil, and that surrounds the generator fixed shaft 45.
  • the generator fixed shaft 45 is mounted to the supporting body 19 by means of a mounting bracket 47.
  • the generator main body 46 is rotated together with the driven shaft 26. Electric current flows through the power generating coil when the generator main body 46 is rotated together with the driven shaft 26.
  • Direction of the electric current that flows through the power generating coil changes depending on the direction of rotation of the driven shaft 26.
  • the generator 43 generates a positive electric current during normal rotation of the driven shaft 26, and generates a negative electric current during reverse rotation of the driven shaft 26.
  • the rectifying apparatus 44 is electrically connected to the generator main body 46 and the electromagnetic coils 40, respectively, by conducting wires 48 and 49.
  • the rectifying apparatus 44 sends either only the positive or only the negative electric current from the generator 43 to the electromagnetic coils 40.
  • the electric power is thereby sent to the electromagnetic coils 40 from the rectifying apparatus 44 either only during normal rotation of the driven shaft 26 or only during reverse rotation.
  • the overspeed detecting switch 21 is disposed radially outside the driven tube 41.
  • the overspeed detecting switch 21 has: a switch main body 50 that is fixed to the supporting body 19; and a switch lever 51 that is disposed on the switch main body 50, and that projects toward the displacing body 28.
  • the operating portion 42 is able to operate the switch lever 51 by displacement of the displacing body 28 relative to the overspeed detecting switch 21.
  • the overspeed detecting switch 21 detects abnormality in the speed of the car 8 by the switch lever 51 being operated by the operating portion 42. Specifically, the overspeed detecting switch 21 detects the presence or absence of an abnormality in the speed of the car 8 based on the presence or absence of detection of the displacing body 28.
  • a stopping signal that stops elevator operation is output from the switch main body 50 on detection of an abnormality in the speed of the car 8 by the overspeed detecting switch 21.
  • the displacement of the displacing body 28 is greater than when the length of the extensible arms 33 is short. Consequently, when the length of the extensible arms 33 is long, the displacing body 28 will reach the position at which the switch lever 51 is operated at a stage when the rotational speed of the driven shaft 26 is lower than when the length of the extensible arms 33 is short.
  • the rotational speed of the driven shaft 26 at which the overspeed detecting switch 21 detects abnormality in the speed of the car 8 is a value that is lower when the length of the extensible arms 33 is long (during descent of the car 8) than when the length of the extensible arms 33 is short (during ascent of the car 8).
  • the controlling apparatus 6 controls elevator operation based on information from the overspeed detecting switch 21.
  • the controlling apparatus 6 determines that an abnormality has arisen in the speed of the car 8, and performs control that stops elevator operation.
  • the gripping apparatus 22 is disposed below the speed governor sheave 15 as shown in Figure 4 .
  • the gripping apparatus 22 has: a fixed shoe 52 that is fixed to the supporting body 19; a movable shoe 53 that is displaceable between a gripping position that grips the speed governor rope 16 against the fixed shoe 52 and an open position that is further away from the fixed shoe 52 than the gripping position; a displacing pressing apparatus 54 that generates a gripping force that grips the speed governor rope 16 between the movable shoe 53 that has been displaced to the gripping position and the fixed shoe 52; and a holding apparatus 55 that holds the movable shoe 53 in the open position during normal operation, and that releases holding of the movable shoe 53 when the rotational speed of the driven shaft 26 reaches a second preset overspeed that is higher than the first preset overspeed.
  • the displacing pressing apparatus 54 has: a shoe compressible arm 56 that is connected between the mount portion that is disposed on the supporting body 19 and the movable shoe 53, and that can be extended and retracted; and a compressed spring (a forcing body) 57 that is disposed on the shoe compressible arm 56, and that forces the movable shoe 53 away from the mount portion of the supporting body 19.
  • the shoe compressible arm 56 is pivotably connected to both the mount portion of the supporting body 19 and the movable shoe 53.
  • the movable shoe 53 is displaced between the gripping position and the open position by the shoe compressible arm 56 being pivoted relative to the mount portion of the supporting body 19.
  • the shoe compressible arm 56 is pushed against the fixed shoe 52 and compressed when the movable shoe 53 is displaced to the gripping position.
  • the shoe compressible arm 56 is subjected to the force of the compressed spring 57 and extended when the movable shoe 53 is displaced to the open position.
  • the compressed spring 57 is compressed between the mount portion of the supporting body 19 and the movable shoe 53.
  • the compressed spring 57 is assumed to be a coil spring through which the shoe compressible arm 56 has been passed internally. The force from the compressed spring 57 increases as the shoe compressible arm 56 is compressed.
  • a gripping force from the displacing pressing apparatus 54 arises due to the movable shoe 53 being displaced toward the gripping position and the force from the compressed spring 57 increasing.
  • the holding apparatus 55 has: an engaging lever 58 that is displaceable between an engaged position that engages with the movable shoe 53 and a released position in which engagement with the movable shoe 53 is disengaged; a releasing spring (a forcing body) 59 that forces the engaging lever 58 in such a direction as to be displaced toward the released position; and a restraining member 60 that holds the engaging lever 58 in the engaged position in opposition to the force from the releasing spring 59.
  • the engaging lever 58 is displaced between the engaged position and the released position by being pivoted around a lever shaft 61 that is disposed on the supporting body 19.
  • the releasing spring 59 is connected between the engaging lever 58 and the supporting body 19.
  • the restraining member 60 is pivotable around a supporting shaft 62 that is disposed on the supporting body 19.
  • the restraining member 60 is linked to the displacing body 28 by means of a link 63.
  • the restraining member 60 is thereby pivoted around the supporting shaft 62 in response to the displacement of the displacing body 28.
  • the link 63 is pivotably connected to both the displacing body 28 and the restraining member 60.
  • the link 63 is displaced upward by an increase in the rotational speed of the driven shaft 26.
  • the engaging lever 58 is held in the engaged position by the restraining member 60 during normal operation.
  • the restraining member 60 is pivoted by upward displacement of the link 63 in a direction in which holding of the engaging lever 58 by the restraining member 60 is disengaged. Holding of the engaging lever 58 by the restraining member 60 is disengaged when the rotational speed of the driven shaft 26 exceeds the first preset overspeed and reaches the second set overspeed.
  • the switch lever 51 is operated by the operating portion 42.
  • a stopping signal is thereby sent to the controlling apparatus 6 from the overspeed detecting switch 21.
  • the controlling apparatus 6 receives the stopping signal, elevator operation is stopped forcibly by control from the controlling apparatus 6.
  • the respective rotational speeds of the driven shaft 26 for displacing the displacing body 28 to the position at which the switch lever 51 is operated, and to the position at which the restraining member 60 is displaced to the released position are lower during descent of the car 8 than during ascent.
  • the first and second preset overspeeds are lower during descent of the car 8 than during ascent.
  • a displacement setting apparatus 30 is disposed in which extensible arms 33 that link fly balls 32 of a speed governor 12 to a driven shaft 26 are able to extend and retract, and the length of the extensible arms 33 is set to different lengths during normal rotation and during reverse rotation, the orbital radius of the fly balls 32 can be set so as to be different during ascent and during descent of the car 8.
  • First and second preset overspeeds for detecting abnormality in the speed of the car 8 can thereby be made different during ascent and during descent of the car 8. Because it is no longer necessary to dispose two speed controlling mechanisms for which the preset overspeeds are set separately, the number of parts can be reduced, enabling cost reductions.
  • overall reductions in the size of the speed governor 12 can also be achieved, size reductions can also be achieved in the elevator apparatus.
  • the displacement setting apparatus 30 has: a generator 43 that generates electric power from the rotation of the driven shaft 26; and a rectifying apparatus 44 that sends electric power to the electromagnetic coils 40 of the extensible arms 33 from the electric power that is generated by the generator 43 either only during normal rotation or only during reverse rotation of the driven shaft 26, external supply of power can be eliminated, enabling the speed governor 12 to be operated in response to the direction of movement of the car 8 more reliably.
  • Adjustment of the first and second preset overspeeds during both ascent and descent of the car 8 can also be easily performed simply by adjusting the retracted positions and the extended positions of the plungers 39.
  • the rectifying apparatus 44 sends only negative electric current to the electromagnetic coils 40, but a rectifying apparatus that sends only positive electric current to the electromagnetic coils 40 may also be used.
  • the first and second preset overspeeds of the car 8 during descent can thereby be set so as to be higher than the first and second preset overspeeds of the car 8 during ascent.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Maintenance And Inspection Apparatuses For Elevators (AREA)
EP09839159A 2009-01-28 2009-01-28 Dispositif d'ascenseur Withdrawn EP2383216A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2009/051337 WO2010086967A1 (fr) 2009-01-28 2009-01-28 Dispositif d'ascenseur

Publications (1)

Publication Number Publication Date
EP2383216A1 true EP2383216A1 (fr) 2011-11-02

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ID=42395237

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09839159A Withdrawn EP2383216A1 (fr) 2009-01-28 2009-01-28 Dispositif d'ascenseur

Country Status (5)

Country Link
EP (1) EP2383216A1 (fr)
JP (1) JPWO2010086967A1 (fr)
KR (1) KR20110094139A (fr)
CN (1) CN102239100A (fr)
WO (1) WO2010086967A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5753072B2 (ja) * 2011-12-21 2015-07-22 株式会社日立製作所 エレベーター装置
JP5850754B2 (ja) * 2012-01-24 2016-02-03 株式会社日立製作所 調速機及びこの調速機を備えたエレベーター装置
JP5809746B2 (ja) * 2012-05-21 2015-11-11 株式会社日立製作所 エレベーター装置
WO2013179336A1 (fr) * 2012-05-30 2013-12-05 株式会社 日立製作所 Dispositif d'ascenseur
CN104583108B (zh) * 2012-08-28 2016-08-24 株式会社日立制作所 电梯设备
JP5886370B2 (ja) * 2014-06-26 2016-03-16 東芝エレベータ株式会社 調速機
CN106276465B (zh) * 2015-06-29 2018-08-28 株式会社日立制作所 电梯装置及其限速器
JP7211450B2 (ja) * 2021-04-20 2023-01-24 フジテック株式会社 エレベータ用調速機及びエレベータ

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06263359A (ja) * 1993-03-09 1994-09-20 Toshiba Corp エレベータガバナ
JP4306014B2 (ja) 1999-05-17 2009-07-29 三菱電機株式会社 調速装置
CN101522554B (zh) * 2006-10-18 2011-11-23 三菱电机株式会社 电梯限速装置以及电梯装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2010086967A1 *

Also Published As

Publication number Publication date
WO2010086967A1 (fr) 2010-08-05
JPWO2010086967A1 (ja) 2012-07-26
KR20110094139A (ko) 2011-08-19
CN102239100A (zh) 2011-11-09

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