WO2002092490A1 - Lift car door driving motor and supporting lintel - Google Patents

Lift car door driving motor and supporting lintel Download PDF

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Publication number
WO2002092490A1
WO2002092490A1 PCT/US2002/015637 US0215637W WO02092490A1 WO 2002092490 A1 WO2002092490 A1 WO 2002092490A1 US 0215637 W US0215637 W US 0215637W WO 02092490 A1 WO02092490 A1 WO 02092490A1
Authority
WO
WIPO (PCT)
Prior art keywords
motor
lintel
pulley
drive device
doors
Prior art date
Application number
PCT/US2002/015637
Other languages
French (fr)
Inventor
Christophe Durand
Mickael Morlet
Thierry Bongibault
Original Assignee
Otis Elevator Company
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 Otis Elevator Company filed Critical Otis Elevator Company
Publication of WO2002092490A1 publication Critical patent/WO2002092490A1/en

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/10—Structural association with clutches, brakes, gears, pulleys or mechanical starters
    • H02K7/1004—Structural association with clutches, brakes, gears, pulleys or mechanical starters with pulleys
    • H02K7/1012—Machine arranged inside the pulley
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B13/00—Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
    • B66B13/02—Door or gate operation
    • B66B13/06—Door or gate operation of sliding doors
    • B66B13/08—Door or gate operation of sliding doors guided for horizontal movement
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/60—Power-operated mechanisms for wings using electrical actuators
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05F—DEVICES FOR MOVING WINGS INTO OPEN OR CLOSED POSITION; CHECKS FOR WINGS; WING FITTINGS NOT OTHERWISE PROVIDED FOR, CONCERNED WITH THE FUNCTIONING OF THE WING
    • E05F15/00—Power-operated mechanisms for wings
    • E05F15/60—Power-operated mechanisms for wings using electrical actuators
    • E05F15/603—Power-operated mechanisms for wings using electrical actuators using rotary electromotors
    • E05F15/632—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for horizontally-sliding wings
    • E05F15/643—Power-operated mechanisms for wings using electrical actuators using rotary electromotors for horizontally-sliding wings operated by flexible elongated pulling elements, e.g. belts, chains or cables
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2400/00—Electronic control; Electrical power; Power supply; Power or signal transmission; User interfaces
    • E05Y2400/10—Electronic control
    • E05Y2400/32—Position control, detection or monitoring
    • E05Y2400/334—Position control, detection or monitoring by using pulse generators
    • E05Y2400/336—Position control, detection or monitoring by using pulse generators of the angular type
    • E—FIXED CONSTRUCTIONS
    • E05—LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES
    • E05Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES E05D AND E05F, RELATING TO CONSTRUCTION ELEMENTS, ELECTRIC CONTROL, POWER SUPPLY, POWER SIGNAL OR TRANSMISSION, USER INTERFACES, MOUNTING OR COUPLING, DETAILS, ACCESSORIES, AUXILIARY OPERATIONS NOT OTHERWISE PROVIDED FOR, APPLICATION THEREOF
    • E05Y2900/00—Application of doors, windows, wings or fittings thereof
    • E05Y2900/10—Application of doors, windows, wings or fittings thereof for buildings or parts thereof
    • E05Y2900/104—Application of doors, windows, wings or fittings thereof for buildings or parts thereof for elevators

Definitions

  • the invention concerns a compact drive device, especially for the translation of elevator booth doors, the electric motor used and the support lintel of the doors of an elevator booth equipped with said elements.
  • the invention seeks to resolve these drawbacks and offers a compact drive device for elevator booth doors and is of the door translation type able to move said doors by means of a belt driven in the upper support lintel of the doors with which said doors are rendered integral, said device being characterised in that it includes an a.c. electric motor of the ring torque type, and a drive pulley of a relatively large diameter and adapted to cover at least one portion of the width of the motor so as to reduce the width of the pulley/motor unit, this unit being fixed to said upper lintel inside the latter.
  • the rotor of the motor with which the drive pulley is rendered integral is mounted rotating on an axis integral with a lateral plate to which the stator is fixed, the latter being fixed to the lintel by a peripheral housing.
  • the thickness of the pulley/motor unit is less than or equal to the width of the support lintel so that it does not project outside the lintel.
  • the motor is of course fed with power by an electronic control block controlling it at a speed able to vary according to the frequency of the current (synchronous motor) and the torque, especially at the end of travel, over an obstacle and in acceleration phase according to the current (intensity), the voltage being kept to a low value, namely about
  • control block and the corresponding 24 volt transformer are housed in the lintel without projecting.
  • the relatively large diameter of the pulley associated with the torque of the motor which is also large, makes it possible to drive doors at an adequate speed directly without requiring a speed reducer.
  • a compact drive device is obtained housed in the support lintel of the elevator booth doors and forms an easily installable homogeneous block which is accessible without projecting for carrying out maintenance operations from the stairs-head, thus increasing the space available in the booth and outside the latter in the shaft.
  • the running pulley receiving the drive belt of the doors at the other extremity of the lintel relatively to the motor is mounted in a housing or similar frame to that of the motor and secured to the lintel, this pulley being identical to that of the motor.
  • a 24 volt stand-by battery can also be installed in the internal section of the lintel without projecting or projecting slightly.
  • the invention also concerns a ring torque type electric motor whose drive pulley covers part of its width, and also an elevator booth door support lintel equipped with the drive device of the invention.
  • Figure 1 is a perspective view of a support lintel of the doors of an elevator booth equipped with the drive device of the invention
  • Figure 2 is a perspective and pull up view of the ring torque motor and its pulley used in the drive device of the invention
  • Figure 3 is a view similar to figure 2 showing the running pulley receiving the drive belt on the lintel at the extremity opposite the motor on the lintel
  • Figure 4 is a cross section view of the lintel equipped with the drive device of the invention.
  • the drive device of the invention is shown for a central open application of two doors 1 of the elevator booth. Of course, it can be applied to other types of booth door opening.
  • the drive device comprises a notched belt 3 extending along a support lintel 5 of the booth doors 1 at the upper portion of the latter.
  • This belt 3 is driven by a motor pulley 7 at one extremity of the lintel 5 and being received at the other extremity by a return running pulley 9 at the other extremity.
  • the belt 3 is shaped into a longitudinal loop with two nearby extremities 11 fixed by fixing brackets to a given door. The other door is fixed to the other loop side of the belt.
  • the doors 1 are guided in horizontal translation (figure 4) with the aid of upper support rollers 13 and lower counter-rollers 15 rolling on a rail 17 placed at the lower portion of the lintel 5.
  • the motor pulley 7 is driven by means of a 24 volt low voltage a.c. electric motor 19. As shown on figure 2, this motor is a ring type torque motor adapted so as to rotate at a low speed (10 to 150 revs/min).
  • the ring, or stator 21 in the present case, fed with current is installed on a housing with cylindrical wings 23 and rendered integral with the aid of external flanges (not shown) on the opposing wings of the lintel.
  • the ring 21 creates a magnetic field which stresses the rotor 25 which is placed rotating inside the stator.
  • the rotor comprises permanent magnets fixed coaxially and regularly at the periphery. It is mounted rotating by two rollers 27 on a fixed shaft 29 which is integral with a circular lateral plate 31. This plate has approximately the same size as that of the housing 23 to which it is fixed by screws. In addition, it closes the motor and forms a common support for the rotor and the stator.
  • a rotation angle sensor of the Hall effect type 33 is fixed to the opposing extremity of the shaft. This Hall effect angle sensor allows control electronic elements to know the relative position of the rotor so as to control the switching of the phases of the stator and also calculate the speed and relative position of the door.
  • the motor pulley 7, whose external diameter is approximately the same as that of the housing 23, covers a portion of the latter (or of the stator) at least one third of its width (1/3 rd to 2/3rds of the stator) and is mounted with slight play against the housing 23.
  • the width of the unit constituted by the motor and its motor pulley is small, namely less than or approximately equal to 110 mm which is the depth of the lintel, so as to be mounted on the latter without projecting.
  • the motor is fed with electric current by a control block 35 with the shape of a parallel piped box fixed inside the lintel.
  • Control of the motor is carried out conventionally at low voltage (24 volts or less) with variable speed control according to the varied frequency and variable torque according to the varied intensity of the current.
  • This box itself is fed by a low voltage electric transformer 37 (24 volts) fed from the current of the network and is also fixed inside the lintel.
  • a stand-by battery 39 is also fixed inside the lintel so as to directly feed, should a breakdown of the system occur, the motor so as to carry out emergency manoeuvres for opening the doors of the booth and evacuate its passengers.
  • the running pulley 9 (figure 3) fixed at the opposing extremity of the lintel relatively to the motor pulley has an identical shape to that of the motor pulley and is mounted on a bearing or housing 41, also identical to that of the motor.
  • the drive device and its pulleys, door drive belt and electric feed and control portion distributed inside the lintel and at the upper portion of the latter without projecting appear as a relatively complete and homogeneous unit only requiring a reduced number of parts.
  • the torque motor drives a pulley having a large diameter and rotates at a variable speed of between 10 and 150 revs/min by virtue of its large torque.
  • a speed reducer is not needed to drive the doors at the required adequate speed and the movement is manually reversible by pushing of the doors.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Elevator Door Apparatuses (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

Compact drive device, especially for the translation of elevator booth doors (1), a used electric motor (19) and support lintel (5) for the doors of an elevator booth.

Description

LIFT CAR DOOR DRIVING MOTOR AND SUPPORTING LINTEL
FIELD OF THE INVENTION
The invention concerns a compact drive device, especially for the translation of elevator booth doors, the electric motor used and the support lintel of the doors of an elevator booth equipped with said elements.
BACKGROUND
Current drive devices for elevator booth doors generally project beyond the roof of the elevator booth and require a relatively large amount of space which may limit the volume of the booth and require that the elevator shaft is higher owing to the top portion of the booth and the required residual space. Moreover, should the system break down, maintenance operations needs to be carried out on the roof of the booth.
SUMMARY OF THE INVENTION
The invention seeks to resolve these drawbacks and offers a compact drive device for elevator booth doors and is of the door translation type able to move said doors by means of a belt driven in the upper support lintel of the doors with which said doors are rendered integral, said device being characterised in that it includes an a.c. electric motor of the ring torque type, and a drive pulley of a relatively large diameter and adapted to cover at least one portion of the width of the motor so as to reduce the width of the pulley/motor unit, this unit being fixed to said upper lintel inside the latter. Advantageously, the rotor of the motor with which the drive pulley is rendered integral is mounted rotating on an axis integral with a lateral plate to which the stator is fixed, the latter being fixed to the lintel by a peripheral housing.
The thickness of the pulley/motor unit is less than or equal to the width of the support lintel so that it does not project outside the lintel. The motor is of course fed with power by an electronic control block controlling it at a speed able to vary according to the frequency of the current (synchronous motor) and the torque, especially at the end of travel, over an obstacle and in acceleration phase according to the current (intensity), the voltage being kept to a low value, namely about
24 volts, so as to increase electric safety. The control block and the corresponding 24 volt transformer are housed in the lintel without projecting.
The relatively large diameter of the pulley associated with the torque of the motor, which is also large, makes it possible to drive doors at an adequate speed directly without requiring a speed reducer. As a result of this arrangement, according to the invention, a compact drive device is obtained housed in the support lintel of the elevator booth doors and forms an easily installable homogeneous block which is accessible without projecting for carrying out maintenance operations from the stairs-head, thus increasing the space available in the booth and outside the latter in the shaft. Moreover, the running pulley receiving the drive belt of the doors at the other extremity of the lintel relatively to the motor is mounted in a housing or similar frame to that of the motor and secured to the lintel, this pulley being identical to that of the motor.
This arrangement reduces the number of pieces required.
In addition, a 24 volt stand-by battery can also be installed in the internal section of the lintel without projecting or projecting slightly.
The invention also concerns a ring torque type electric motor whose drive pulley covers part of its width, and also an elevator booth door support lintel equipped with the drive device of the invention.
These characteristics and advantages of the invention and others shall be more readily understood from a reading of the following description of an embodiment example of the invention with reference to the accompanying drawings on which:
BRIEF DESCRIPTION OF THE DRAWINGS/FIGURES
Figure 1 is a perspective view of a support lintel of the doors of an elevator booth equipped with the drive device of the invention; Figure 2 is a perspective and pull up view of the ring torque motor and its pulley used in the drive device of the invention;
Figure 3 is a view similar to figure 2 showing the running pulley receiving the drive belt on the lintel at the extremity opposite the motor on the lintel, and Figure 4 is a cross section view of the lintel equipped with the drive device of the invention.
DETAILED DESCRIPTION
As shown on figure 1, the drive device of the invention is shown for a central open application of two doors 1 of the elevator booth. Of course, it can be applied to other types of booth door opening.
The drive device comprises a notched belt 3 extending along a support lintel 5 of the booth doors 1 at the upper portion of the latter. This belt 3 is driven by a motor pulley 7 at one extremity of the lintel 5 and being received at the other extremity by a return running pulley 9 at the other extremity. The belt 3 is shaped into a longitudinal loop with two nearby extremities 11 fixed by fixing brackets to a given door. The other door is fixed to the other loop side of the belt.
The doors 1 are guided in horizontal translation (figure 4) with the aid of upper support rollers 13 and lower counter-rollers 15 rolling on a rail 17 placed at the lower portion of the lintel 5.
The motor pulley 7 is driven by means of a 24 volt low voltage a.c. electric motor 19. As shown on figure 2, this motor is a ring type torque motor adapted so as to rotate at a low speed (10 to 150 revs/min).
The ring, or stator 21 in the present case, fed with current is installed on a housing with cylindrical wings 23 and rendered integral with the aid of external flanges (not shown) on the opposing wings of the lintel.
The ring 21 creates a magnetic field which stresses the rotor 25 which is placed rotating inside the stator. The rotor comprises permanent magnets fixed coaxially and regularly at the periphery. It is mounted rotating by two rollers 27 on a fixed shaft 29 which is integral with a circular lateral plate 31. This plate has approximately the same size as that of the housing 23 to which it is fixed by screws. In addition, it closes the motor and forms a common support for the rotor and the stator.
A rotation angle sensor of the Hall effect type 33 is fixed to the opposing extremity of the shaft. This Hall effect angle sensor allows control electronic elements to know the relative position of the rotor so as to control the switching of the phases of the stator and also calculate the speed and relative position of the door.
The motor pulley 7, whose external diameter is approximately the same as that of the housing 23, covers a portion of the latter (or of the stator) at least one third of its width (1/3 rd to 2/3rds of the stator) and is mounted with slight play against the housing 23. Thus, the width of the unit constituted by the motor and its motor pulley is small, namely less than or approximately equal to 110 mm which is the depth of the lintel, so as to be mounted on the latter without projecting.
The motor is fed with electric current by a control block 35 with the shape of a parallel piped box fixed inside the lintel. Control of the motor is carried out conventionally at low voltage (24 volts or less) with variable speed control according to the varied frequency and variable torque according to the varied intensity of the current.
This box itself is fed by a low voltage electric transformer 37 (24 volts) fed from the current of the network and is also fixed inside the lintel. A stand-by battery 39 is also fixed inside the lintel so as to directly feed, should a breakdown of the system occur, the motor so as to carry out emergency manoeuvres for opening the doors of the booth and evacuate its passengers.
Finally, the running pulley 9 (figure 3) fixed at the opposing extremity of the lintel relatively to the motor pulley has an identical shape to that of the motor pulley and is mounted on a bearing or housing 41, also identical to that of the motor. Thus, the drive device and its pulleys, door drive belt and electric feed and control portion distributed inside the lintel and at the upper portion of the latter without projecting appear as a relatively complete and homogeneous unit only requiring a reduced number of parts.
It shall be noted that the torque motor drives a pulley having a large diameter and rotates at a variable speed of between 10 and 150 revs/min by virtue of its large torque. A speed reducer is not needed to drive the doors at the required adequate speed and the movement is manually reversible by pushing of the doors.

Claims

1. A compact device for driving elevator booth doors (1) and of the door translation type with the aid of a belt (3) driven in the upper support lintel (5) of the doors with which the doors are rendered integral, said device being characterised in that it includes a ring torque type a.c. electric motor (19) and a drive pulley (7) with a relatively large diameter and adapted so as to cover at least one portion of the width of the motor (19) so as to reduce the width of the unit constituted by the motor (19) and the pulley (7), this motor/pulley unit being fixed to said upper lintel (5) inside the latter.
2. The drive device according to claim 1, characterised in that the rotor (25) of the motor joined to the drive pulley (7) is mounted rotating on a spindle (29) fixed on the lintel (5).
3. The drive device according to claim 1 or 2, characterised in that the ring which creates the magnetic field or stator (21) is placed in a frame or housing (23) fixed to the lintel.
4. The drive device according to one of the preceding claims, characterised in that said fixed frame or housing (23) is joined to a lateral plate (31) forming the rear portion of the motor and integral with the support spindle (29) of the rotor, the thickness of the unit constituted by the motor and the pulley being smaller than or equal to the width of the support lintel so that it does not project outside the lintel.
5. The drive device according to one of the preceding claims, characterised in that the motor (19) is fed by an electronic control block (35) controlling it at a speed which varies according to the frequency of the current (synchronous motor) and at a variable torque, especially at the end of travel, over an obstacle and in acceleration phase according to the current (intensity), the voltage being kept at a low value, namely about 24 volts, so as to increase the electric safety of the device.
6. The drive device according to one of the preceding claims, characterised in that fixed to the opposing extremity of the shaft is a Hall effect type rotation angle sensor (33) allowing control electronics to know the relative position of the rotor so as to manage communication of the phases of the stator and also calculate the speed and relative position of the door.
7. The drive device according to claim 5, characterised in that the control block (35) and the corresponding feed transformer (37) are housed in the lintel (5) without projecting.
8. The drive device according to one of the preceding claims, characterised in that the diameter of the pulley (7), which is relatively large and associated with the torque of the motor (19), also significant, makes it possible to drives the doors (1) at the required adequate speed directly without needing a speed reducer.
9. The drive device according to one of the preceding claims, characterised in that the running pulley (9) receiving the door drive belt (3) at the other extremity of the lintel (5) in relation to the motor is mounted in a housing or frame (41) similar to that of the motor (19) and fixed on the lintel (5), the latter also being identical to that of the motor (19).
10. The drive device according to one of the preceding claims, characterised in that it comprises a stand-by battery (39) placed in the internal section of the lintel without projecting or projecting slightly.
11. The electric motor in particular for driving the device as claimed in claims 1 to 9, characterised in that it is of the ring torque type, fed with low voltage a.c. current, is speed and torque controlled and has a drive pulley (7) of relatively large diameter without any speed reducer and which covers one portion of its width so as to reduce its thickness.
12. A Support lintel for the doors of an elevator booth, characterised in that it comprises a compact device for driving doors (1) as indicated in claims 1 to 10 and forming a homogeneous block which does not project, can be easily placed and is accessible for maintenance from the landing and which increases the space available in the booth and outside the latter in the shaft.
PCT/US2002/015637 2001-05-16 2002-05-15 Lift car door driving motor and supporting lintel WO2002092490A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0106429A FR2824819A1 (en) 2001-05-16 2001-05-16 Compact drive device for driving elevator booth doors, has drive pulley with large diameter and adapted to cover width portion of motor so as to reduce width of unit comprising motor and pulley
FR0106429 2001-05-16

Publications (1)

Publication Number Publication Date
WO2002092490A1 true WO2002092490A1 (en) 2002-11-21

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ID=8863332

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2002/015637 WO2002092490A1 (en) 2001-05-16 2002-05-15 Lift car door driving motor and supporting lintel

Country Status (2)

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FR (1) FR2824819A1 (en)
WO (1) WO2002092490A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111395A1 (en) * 2005-04-21 2006-10-26 Wittur Ag Flat motor door drive module
CN111332915A (en) * 2020-03-03 2020-06-26 上海吉亿电机有限公司 Gantry crane motor belt pulley mounting structure and mounting method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2002358990A1 (en) * 2002-11-25 2004-06-18 Wittur S.P.A. Motorisation for closing and opening automatic doors

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711323A (en) * 1984-11-22 1987-12-08 Inventio Ag Door drive for doors of elevator cars
US5701973A (en) * 1995-06-23 1997-12-30 Otis Elevator Company Linear belt door operator
US5878846A (en) * 1996-10-07 1999-03-09 Vertisys, Inc. Light duty elevator door operator
US20010029219A1 (en) * 2000-04-06 2001-10-11 Sumitomo Heavy Industries, Ltd Belt-type door opening and closing drive apparatus
US20020003065A1 (en) * 1998-12-23 2002-01-10 Christian G. Tonna Elevator door system

Family Cites Families (2)

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Publication number Priority date Publication date Assignee Title
US5797471A (en) * 1996-07-19 1998-08-25 Montgomery Kone Inc. Linear door drive operator
JP2001226058A (en) * 2000-02-10 2001-08-21 Mitsubishi Electric Corp Door device of elevator

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4711323A (en) * 1984-11-22 1987-12-08 Inventio Ag Door drive for doors of elevator cars
US5701973A (en) * 1995-06-23 1997-12-30 Otis Elevator Company Linear belt door operator
US5878846A (en) * 1996-10-07 1999-03-09 Vertisys, Inc. Light duty elevator door operator
US20020003065A1 (en) * 1998-12-23 2002-01-10 Christian G. Tonna Elevator door system
US20010029219A1 (en) * 2000-04-06 2001-10-11 Sumitomo Heavy Industries, Ltd Belt-type door opening and closing drive apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006111395A1 (en) * 2005-04-21 2006-10-26 Wittur Ag Flat motor door drive module
CN111332915A (en) * 2020-03-03 2020-06-26 上海吉亿电机有限公司 Gantry crane motor belt pulley mounting structure and mounting method
CN111332915B (en) * 2020-03-03 2022-03-25 上海吉亿电机有限公司 Gantry crane motor belt pulley mounting structure and mounting method

Also Published As

Publication number Publication date
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