WO2015173913A1 - Dispositif d'ascenseur et procédé de commande pour ce dernier - Google Patents

Dispositif d'ascenseur et procédé de commande pour ce dernier Download PDF

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Publication number
WO2015173913A1
WO2015173913A1 PCT/JP2014/062847 JP2014062847W WO2015173913A1 WO 2015173913 A1 WO2015173913 A1 WO 2015173913A1 JP 2014062847 W JP2014062847 W JP 2014062847W WO 2015173913 A1 WO2015173913 A1 WO 2015173913A1
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WO
WIPO (PCT)
Prior art keywords
car
suspension
abnormality
level
governor
Prior art date
Application number
PCT/JP2014/062847
Other languages
English (en)
Japanese (ja)
Inventor
坂野　裕一
政之 垣尾
琢夫 釘谷
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to PCT/JP2014/062847 priority Critical patent/WO2015173913A1/fr
Publication of WO2015173913A1 publication Critical patent/WO2015173913A1/fr

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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
    • 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
    • B66B5/12—Applications of checking, fault-correcting, or safety devices in elevators responsive to abnormal operating conditions in case of rope or cable slack

Definitions

  • the present invention relates to an elevator apparatus in which a car is suspended by a plurality of suspension bodies and a control method therefor.
  • the suspension abnormality detection device detects whether the degree of abnormality of the suspension is the first level or the second level higher than the first level.
  • the elevator control device moves the car to the nearest floor, and then moves the car to a position more than a predetermined distance away from the car shock absorber (see, for example, Patent Document 1). .
  • the car when the first level abnormality occurs in the suspension, the car is moved to a position more than a predetermined distance from the car shock absorber and stopped, so after the car is stopped In the unlikely event that the suspension body is completely broken, the emergency stop device operates after the car speed reaches an excessive speed, and the impact applied to the car due to the operation of the emergency stop device is large.
  • the present invention has been made in order to solve the above-described problems, and when a second level abnormality occurs after the operation of the car is suspended due to the first level abnormality, It is an object of the present invention to provide an elevator apparatus and a control method thereof that can prevent a large impact from being applied to the vehicle.
  • An elevator apparatus includes a hoisting machine having a drive sheave, a plurality of suspension bodies wound around the drive sheave, and a car that is suspended in the hoistway by the suspension body and moves up and down in the hoistway
  • a control unit that controls the operation of the car and monitors the presence or absence of an abnormality
  • a car emergency stop device mounted on the car
  • a speed governor having a speed governor sheave, and being wound around the speed governor sheave
  • a governor rope that is connected to the car emergency stop device and circulates as the car moves up and down
  • a governor rope gripping device that grips the governor rope according to the operation signal
  • a suspension abnormality detection device that detects excessive elongation as an abnormality of the suspension is provided, and the suspension abnormality detection device has a second level in which the degree of abnormality of the suspension is the first level or higher than the first level.
  • the elevator apparatus includes a hoist having a drive sheave, a plurality of suspension bodies wound around the drive sheave, and suspended in the hoistway by the suspension body.
  • a suspension abnormality detection device wherein the suspension abnormality detection device detects whether the degree of abnormality of the suspension is a first level or a second level higher than the first level, When the first level abnormality occurs in the suspension, the control unit moves the car to one of the stop floors, stops it, performs the operation to get off the passenger, and then turns the car into the car buffer. Close the shock absorber close position In stopping.
  • the car when breakage or excessive elongation of a suspension body is detected as an abnormality, if the number of suspension bodies in which the abnormality is detected is equal to or less than a set number, the car is either The car is stopped by moving to the stop floor, and the speed governor rope is gripped by the speed governor rope gripping apparatus, and the car emergency stop device is operated by moving the car downward after the passenger gets off.
  • the car when a breakage or excessive elongation of the suspension body is detected as an abnormality, if the number of suspension bodies in which the abnormality is detected is equal to or less than the set number, the car is either After moving to the stop floor and stopping the passengers, the car is brought close to the car buffer and stopped.
  • the elevator apparatus and the control method thereof according to the present invention prevent a large shock from being applied to the car when a second level abnormality occurs after the operation of the car is stopped due to the first level abnormality. be able to.
  • FIG. 1 is a block diagram showing an elevator apparatus according to Embodiment 1 of the present invention.
  • a machine room 2 is provided in the upper part of the hoistway 1.
  • a hoisting machine 3 is installed in the machine room 2.
  • the hoisting machine 3 includes a driving sheave 3a, a hoisting machine motor that rotates the driving sheave 3a, and a hoisting machine brake that brakes the rotation of the driving sheave 3a.
  • a plurality of suspension bodies 4 (only one is shown in FIG. 1) are wound around the drive sheave 3a.
  • the car 5 and the counterweight 6 are suspended in the hoistway 1 by the suspension body 4 and are moved up and down in the hoistway 1 by the driving force of the hoisting machine 3.
  • a pair of car guide rails (not shown) for guiding the raising and lowering of the car 5 and a pair of counterweight guide rails (not shown) for guiding the raising and lowering of the counterweight 6 are installed.
  • a car shock absorber 7 and a counterweight shock absorber 8 are installed at the lower part of the hoistway 1.
  • a speed governor 9 is installed in the machine room 2.
  • the governor 9 has a governor sheave 10.
  • a governor rope 11 is wound around the governor sheave 10.
  • the governor rope 11 is laid endlessly in the hoistway 1.
  • the governor rope 11 is wound around a tension wheel 12 at the lower part in the hoistway 1.
  • Both ends of the governor rope 11 are connected to an operation lever of a car safety device 13 mounted on the car 5.
  • the governor rope 11 circulates as the car 5 moves up and down.
  • the governor sheave 10 rotates at a speed corresponding to the traveling speed of the car 5.
  • the operation lever When the speed governor rope 11 is gripped by the speed governor 9 during traveling in the downward direction of the car 5, the operation lever is relatively lifted and the car emergency stop device 13 is activated.
  • the car emergency stop device 13 grips the car guide rail when operating, and makes the car 5 emergency stop.
  • the control unit 14 includes an operation control device 15 that controls traveling of the car 5, door opening and closing, and the like, and a safety control device 16 that monitors the presence or absence of an abnormality in the elevator device.
  • the operation control device 15 and the safety control device 16 each have an independent microcomputer.
  • the operation control device 15 and the safety control device 16 can communicate with each other.
  • the car position information and the car speed information are input to the operation control device 15.
  • the car position information and the car speed information are also input to the safety control device 16.
  • the car position information and the car speed information are input directly to the safety control device 16 without passing through the operation control device 15.
  • the car position information and the car speed information are, for example, a speed governor encoder provided in the speed governor 9, a hoisting machine encoder provided in the hoisting machine 3, a sensor or a switch mounted in the car 5, or a hoistway It can be obtained from a sensor or a switch installed in 1.
  • a suspension abnormality detection device 17 that detects breakage or excessive elongation of the suspension 4 as an abnormality of the suspension 4 is provided at a connection portion of the suspension 4 to the car 5.
  • a detection signal from the suspension abnormality detection device 17 is input to the safety control device 16.
  • a governor rope gripping device 18 is provided near the governor 9 in the machine room 2.
  • the governor rope gripping device 18 grips the governor rope 11 in accordance with an operation signal from the safety control device 16.
  • FIG. 2 is a block diagram showing the governor rope gripping device 18 of FIG. 2 of the governor rope 11 moves upward when the car 5 rises and moves downward when the car 5 descends.
  • the first and second grip portions 31 and 32 that grip (hold) the governor rope 11 are opposed to each other with the governor rope 11 in between.
  • a plurality of gripping force adjusting springs 34 are interposed between the first gripping portion 31 and the fixed portion 33.
  • the second grip 32 has a base 35, a wedge 36, and a wedge detachment stop 37.
  • the base 35 is provided with an inclined surface 35a that approaches the governor rope 11 downward.
  • the wedge 36 is slidable within a predetermined range along the inclined surface 35a. The upward displacement of the wedge 36 is regulated by a wedge detachment stop 37.
  • a gripping force applying device (actuator) 38 is connected to the base 35.
  • the gripping force adding device 38 displaces the second gripping portion 32 in a direction in contact with the governor rope 11.
  • the wedge 36 is brought into contact with the governor rope 11 by advancing the second grip 32 by the gripping force adding device 38.
  • FIG. 3 is a block diagram showing the suspension abnormality detection device 17 of FIG.
  • Three rails 41a, 41b, and 41c are erected vertically on the upper portion of the car 5.
  • a support plate 42 is fixed horizontally to the rails 41a, 41b, 41c.
  • the first to fourth shackle rods 43a to 43d pass through the support plate.
  • a corresponding suspension body 4 is connected to the upper end portions of the shackle rods 43a to 43d.
  • a spring pressing member 44 is fixed to each shackle rod 43a to 43d.
  • a shackle spring 45 is provided between each spring pressing member 44 and the support plate 42. Each shackle spring 45 is compressed by a load acting on the corresponding shackle rod 43a to 43d.
  • the first movable plate 46a is movable up and down along the rails 41a and 41b.
  • the second movable plate 46b can move up and down along the rails 41b and 41c.
  • the first and second movable plates 46 a and 46 b are normally held at predetermined positions below the spring pressing member 44. Further, the first and second movable plates 46 a and 46 b are pushed down by the spring pressing member 44 when the suspension body 4 is broken (or excessively extended) and the shackle spring 45 is extended.
  • a first detection switch 47a that is operated and opened by a downward displacement of the first movable plate 46a is disposed.
  • the first detection switch 47a detects an abnormality of the suspension body 4 connected to the first and second shackle rods 43a and 43b.
  • a second detection switch 47b which is operated and opened by a downward displacement of the second movable plate 46b is disposed.
  • the second detection switch 47b detects an abnormality of the suspension body 4 connected to the third and fourth shackle rods 43c and 43d.
  • the suspension abnormality detection device 17 includes first and second movable plates 46a and 46b, and first and second detection switches 47a and 47b. Further, the suspension abnormality detection device 17 determines whether the degree of abnormality of the suspension 4, that is, the degree of occurrence of abnormality, is the first level or the second level higher than the first level. Detect and distinguish.
  • the first level is set when only one of the first and second detection switches 47a and 47b is operated, and the second level is set when both are operated. Therefore, when an abnormality occurs in only one of the four suspension bodies 4, it is the first level, and when an abnormality occurs in three or more suspension bodies 4, it is the second level. Further, when an abnormality occurs in the two suspension bodies 4, there are cases where the first level is detected and the second level is detected depending on the position of the suspension body 4 where the abnormality has occurred.
  • the detection signals of the first and second detection switches 47a and 47b are input to the safety control device 16.
  • the control unit 14 moves the car 5 to one of the stop floors and stops it.
  • the control unit 14 selects the car 5 if the degree of the number of abnormal suspension bodies 4 is equal to or lower than a preset level. Move to that stop floor and stop.
  • the controller 14 moves the car 5 to the nearest floor and stops it.
  • the nearest floor is the nearest stopable floor in the traveling direction of the car 5.
  • control unit 14 moves the car 5 to the nearest floor and stops it, and inputs an operation signal to the governor rope gripping device 18 to cause the governor rope 11 to move.
  • the car emergency stop device 13 is actuated by moving the car 5 downward after gripping and performing an operation for getting the passenger to get off.
  • FIG. 4 is a flowchart showing the operation of the control unit 14 according to the first embodiment.
  • the safety control device 16 determines whether or not the first or second detection switch 47a, 47b is opened during normal operation of the car 5 (steps S1 to S3). If both the first and second detection switches 47a and 47b are closed, it is determined that the suspension 4 is not broken and excessively stretched, and normal operation is continued.
  • the safety control device 16 determines that a first level abnormality has occurred and issues a command to move the car 5 to the nearest floor. Is output to the operation control device 15. Thereafter, when the safety control device 16 confirms that the car 5 has stopped at the nearest floor based on the car position information and the car speed information, the safety control device 16 grips the speed governor rope 11 with respect to the speed governor rope gripping device 18. A command is issued (step S5).
  • the operation control device 15 When the operation control device 15 receives the nearest floor stop command from the safety control device 16, the operation control device 15 moves the car 5 to the nearest floor and stops it (step S4), opens the door (step S6), and makes an announcement to drop the passenger. Perform (step S7). Thereafter, when a predetermined time elapses, the operation control device 15 closes the door (step S8), and moves the car 5 downward at a low speed. At this time, since the speed governor rope 11 is gripped by the speed governor rope gripping device 18, the car safety device 13 operates (step S9). When the car emergency stop device 13 is operated, the hoisting machine brake is also operated, and the car 5 is in an emergency stop state.
  • the safety factor of the suspension 4 is set sufficiently high, and the performance of the suspension 4 is maintained by maintenance. For this reason, even if one of the suspension bodies 4 is broken or excessively extended, the load can be supported by the remaining suspension bodies 4, and the second one after the first suspension body 4 is broken or excessively extended. It is considered that there is a certain amount of time until the suspension body 4 is broken or excessively extended. Using this time, the car 5 can be moved to the nearest floor.
  • the safety control device 16 determines that there is a possibility that an abnormality has occurred in all the suspension bodies 4 (second level).
  • the governor rope gripping device 18 is immediately actuated (step S10).
  • the passenger gets off while holding the governor rope 11 by the governor rope gripping device 18, even if a second level abnormality occurs while the passenger is getting off, the car 5 is dropped. It can be stopped immediately.
  • Embodiment 2 FIG. Next, a second embodiment of the present invention will be described.
  • the configuration of the elevator apparatus of the second embodiment is the same as that of the first embodiment.
  • the control unit 14 moves the car 5 to one of the stop floors to stop it, and performs an operation for getting off the passenger.
  • the controller 14 moves the car 5 to the nearest floor and stops it.
  • the control unit 14 causes the car 5 to approach the car shock absorber 7 at a low speed, stops the car 5 at the shock absorber proximity stop position, and inputs an operation signal to the speed governor rope gripping device 18 to cause the speed governor rope 11 to move. Hold it.
  • the shock absorber proximity stop position is a position where the distance to the car shock absorber 7 is equal to or less than the set distance. Further, it is desirable that the shock absorber proximity stop position is as close as possible to the car shock absorber 7 as long as it is not restricted by other safety devices (such as a terminal floor excess detection device).
  • the distance between the car 5 and the car shock absorber 7 when the car 5 is stopped at the shock absorber proximity stop position is the speed at which the car 5 reaches the point where it starts free-falling and collides with the car shock absorber 7. Is a distance that does not exceed the permissible collision speed of the car shock absorber 7. Generally, the distance between the car 5 and the car shock absorber 7 when the car 5 is stopped at the shock absorber proximity stop position is equal to or less than the buffer stroke of the car shock absorber 7.
  • FIG. 5 is a flowchart showing the operation of the control unit 14 according to the second embodiment.
  • operations in steps S1 to S4, 10, and 9 are the same as those in the first embodiment.
  • the safety control device 16 does not input an operation signal to the governor rope gripping device 18. .
  • the operation control device 15 opens the door on the nearest floor (step S6), makes an announcement for lowering the passenger (step S7), and closes the door after a predetermined time (step S8). . Thereafter, the operation control device 15 moves the car 5 downward at a low speed and stops it at the shock absorber proximity stop position (step S11). At this stage, when the safety control device 16 detects that the car 5 has stopped at the shock absorber proximity stop position, the safety control device 16 inputs an operation signal to the governor rope gripping device 18 (step S12). Operate the upper brake.
  • the operation signal is input to the governor rope gripping device 18 after the car 5 is stopped at the shock absorber proximity stop position, the operation of the car 5 should be stopped due to the first level abnormality.
  • the car emergency stop device 13 can more reliably stop the car 5 while alleviating the impact applied to the car 5 by the car shock absorber 7.
  • the governor rope gripping device 18 After stopping the car 5 at the nearest floor, the governor rope gripping device 18 once grips the governor rope 11 and before the operation of moving the car 5 to the shock absorber proximity stop position, the governor rope. The gripping of the governor rope 11 by the gripping device 18 may be released. Further, for example, when the distance between the car 5 and the car shock absorber 7 when stopped at the shock absorber proximity stop position is sufficiently small, the speed governor rope 11 is not necessarily gripped by the speed governor rope gripping device 18. You don't have to.
  • FIG. 6 is a block diagram showing an elevator apparatus according to Embodiment 3 of the present invention.
  • the counterweight emergency stop device 19 is mounted on the counterweight 6.
  • the counterweight emergency stop device 19 grips the counterweight guide rail and operates the counterweight 6 to make an emergency stop when operating.
  • the governor rope 11 is connected to the operation lever of the counterweight emergency stop device 19.
  • the car emergency stop device 13 is connected to the governor rope 11 on one side of the governor sheave 10
  • the counterweight emergency stop device 19 is connected to the governor rope 11 on the other side of the governor sheave 10. It is connected to the.
  • Other configurations and operations are the same as those in the first embodiment.
  • Embodiment 4 FIG. Next, a fourth embodiment of the present invention will be described.
  • the configuration of the elevator apparatus of the fourth embodiment is the same as that of the third embodiment.
  • the operation of the control unit 14 of the fourth embodiment is the same as that of the second embodiment.
  • the counterweight emergency stop device 19 In such an elevator apparatus, in the unlikely event that a second level abnormality occurs after the operation of the car 5 is stopped at the shock absorber proximity stop position due to the first level abnormality, the counterweight emergency stop device 19 is provided. Operates immediately, so that the counterweight 6 can be prevented from falling.
  • the layout of the entire elevator apparatus is not limited to the configuration shown in FIGS. 1 and 6, and the present invention can be applied to, for example, a 2: 1 roping type elevator, a machine room-less elevator, and a double deck elevator.
  • the present invention can be applied to any type of elevator apparatus such as an elevator using a counterweight.
  • the car emergency stop device 13 and the counterweight emergency stop device 19 are connected to the common governor rope 11, but the counterweight for the counterweight, the governor rope, A governor rope gripping device or the like may be added.
  • the control unit stops the operation of the car 5 due to the first level abnormality, the control unit sends an operation signal to the governor rope gripping device for the car and the governor rope gripping device for the counterweight. You may enter.
  • the suspension abnormality detection device 17 is provided on the car 5, but it may be provided on the counterweight 6.
  • a suspension abnormality detection device may be provided in at least one of the connecting portions at both ends of the suspension provided in the upper part of the hoistway.
  • the detection method of the suspension abnormality detection device is not limited to the above example.
  • a method that uses a scale device, a method that uses a suspension of a suspension provided in a car, and an image diagnosis Various known detection methods such as a method based on the above or a method for detecting the state of the wire of the suspension can be used.
  • the degree of abnormality of the suspension is detected in two stages, but the degree of abnormality in the suspension may be detected in three or more stages.
  • the same number of detection switches as the number of suspensions may be used to accurately detect how many suspensions have broken. It is also possible to appropriately set how many breaks (which level of anomaly) are used to move to the nearest floor.
  • a pattern different from the speed pattern before the abnormality of the suspension is detected as the speed pattern when the car is moved after the abnormality of the suspension is detected.
  • the floor on which the car is moved when the suspension is abnormal is not limited to the nearest floor, and may be, for example, a specific stop floor designated in advance. Further, for example, the nearest floor among a plurality of stop floors designated in advance may be used.
  • the control unit 14 having the drive control device 15 and the safety control device 16 is shown. However, the function of the control unit is implemented by one device or divided by three or more devices. Or you may.

Abstract

L'invention porte sur un dispositif d'ascenseur, dans lequel dispositif un dispositif de détection d'anomalie de corps suspendus (17) détecte une rupture ou un étirement excessif de corps suspendus (4) à titre d'anomalie desdits corps suspendus (4). Dans ce cas, le dispositif de détection d'anomalie de corps suspendus (17) effectue une détection du fait que le degré d'anomalie desdits corps suspendus est à un niveau un, ou à un niveau deux qui est supérieur au niveau un. Si une anomalie de niveau un dans les corps suspendus (4) se produit, une unité de commande (14) déplace et arrête une cabine (5) à n'importe quel étage auquel la cabine (5) s'arrête, entre un signal d'activation sur un dispositif de saisie de câble de régulateur (18), et effectue des opérations pour débarquer les passagers, après quoi l'unité de commande (14) déplace la cabine vers le bas de façon à actionner un dispositif d'arrêt d'urgence de cabine (13).
PCT/JP2014/062847 2014-05-14 2014-05-14 Dispositif d'ascenseur et procédé de commande pour ce dernier WO2015173913A1 (fr)

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Application Number Priority Date Filing Date Title
PCT/JP2014/062847 WO2015173913A1 (fr) 2014-05-14 2014-05-14 Dispositif d'ascenseur et procédé de commande pour ce dernier

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Application Number Priority Date Filing Date Title
PCT/JP2014/062847 WO2015173913A1 (fr) 2014-05-14 2014-05-14 Dispositif d'ascenseur et procédé de commande pour ce dernier

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108367885A (zh) * 2015-12-14 2018-08-03 三菱电机株式会社 电梯的控制装置
EP3517473A1 (fr) * 2018-01-25 2019-07-31 KONE Corporation Frein à inertie destiné à freiner un câble de régulateur d'un système de régulation d'un système d'ascenseur
CN112875592A (zh) * 2020-12-31 2021-06-01 乔治洛德方法研究和开发液化空气有限公司 可升降的施工系统及其操作方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6186380A (ja) * 1984-10-05 1986-05-01 株式会社日立製作所 エレベ−タ−の制御装置
JPH05155550A (ja) * 1991-12-10 1993-06-22 Mitsubishi Electric Corp エレベータ制御装置
JP2005194066A (ja) * 2004-01-08 2005-07-21 Mitsubishi Electric Corp エレベータの制御装置
WO2009078100A1 (fr) * 2007-12-19 2009-06-25 Mitsubishi Electric Corporation Dispositif élévateur
WO2013094612A1 (fr) * 2011-12-21 2013-06-27 三菱電機株式会社 Dispositif d'ascenseur et procédé de commande pour celui-ci

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6186380A (ja) * 1984-10-05 1986-05-01 株式会社日立製作所 エレベ−タ−の制御装置
JPH05155550A (ja) * 1991-12-10 1993-06-22 Mitsubishi Electric Corp エレベータ制御装置
JP2005194066A (ja) * 2004-01-08 2005-07-21 Mitsubishi Electric Corp エレベータの制御装置
WO2009078100A1 (fr) * 2007-12-19 2009-06-25 Mitsubishi Electric Corporation Dispositif élévateur
WO2013094612A1 (fr) * 2011-12-21 2013-06-27 三菱電機株式会社 Dispositif d'ascenseur et procédé de commande pour celui-ci

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108367885A (zh) * 2015-12-14 2018-08-03 三菱电机株式会社 电梯的控制装置
EP3517473A1 (fr) * 2018-01-25 2019-07-31 KONE Corporation Frein à inertie destiné à freiner un câble de régulateur d'un système de régulation d'un système d'ascenseur
CN112875592A (zh) * 2020-12-31 2021-06-01 乔治洛德方法研究和开发液化空气有限公司 可升降的施工系统及其操作方法
CN112875592B (zh) * 2020-12-31 2022-10-21 乔治洛德方法研究和开发液化空气有限公司 可升降的施工系统及其操作方法

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