JP2018095357A - Elevator heavy article lifting system and elevator heavy article lifting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator heavy article lifting system capable of reducing man-hours for lifting a heavy article.SOLUTION: An elevator heavy article lifting system 20 is provided with: an oil buffer 30 that has a plunger 32 and that is provided to a floor surface 13a of a hoistway 2; and a pressure oil supply unit 40 that pressurizes and supplies hydraulic oil to the oil buffer 30. A lifting base 50 on which a heavy article W is loaded is mounted on the plunger 32 of the oil buffer 30.SELECTED DRAWING: Figure 2

Description

  Embodiments of the present invention relate to an elevator weight lifting system and an elevator weight lifting method.

  Heavy objects may be lifted in the elevator pit (lower part of the hoistway). An example of such a heavy object is a weight called a dead weight that is loaded on a car. The dead weight is for increasing the frictional force between the traction sheave of the hoist and the main rope by increasing the tension of the main rope for raising and lowering the car and the counterweight.

  When a heavy object is loaded on the car, the heavy object is lifted from the floor of the pit to the car positioned at the lower part of the hoistway. When a suspension base is provided in the pit, it is possible to lift a heavy object by attaching a chain block to the suspension base. On the other hand, when the suspension base is not provided, it is conceivable that the heavy object is lifted by human power, but the safety of the worker becomes a problem. Therefore, in order to ensure the safety of the operator, a heavy object may be lifted using a lifting device such as a hydraulic jack.

JP 2004-189344 A

  However, when lifting heavy objects using lifting equipment, the lifting equipment is carried into the pit and installed. It takes a lot of time to install the lifting equipment. For this reason, there exists a problem that the man-hour for lifting a heavy load increases.

  The present invention has been made in view of the above points, and provides an elevator weight lifting system and an elevator weight lifting method capable of reducing the number of steps for lifting a heavy object. The purpose is to do.

  An elevator heavy load lifting system according to an embodiment is a system for lifting a heavy load in a hoistway. The elevator heavy load lifting system includes an oil buffer having a plunger, and a pressure oil supply unit that pressurizes and supplies hydraulic oil to the oil buffer. A lifting platform on which a heavy object is loaded is placed on the plunger of the oil buffer.

  Moreover, the heavy material lifting method of the elevator by embodiment is a method for lifting a heavy load in a hoistway. The elevator lifting method includes a step of connecting a pressure oil supply unit to an oil buffer provided on a floor surface of a hoistway, a step of placing a lifting platform on a plunger of the oil buffer, and a lifting platform. A step of loading a heavy object, and a step of pressurizing and supplying hydraulic oil to the oil buffer from the pressure oil supply unit to lift the heavy object.

FIG. 1 is a diagram illustrating a schematic configuration of an elevator apparatus according to the first embodiment. FIG. 2 is a diagram showing a schematic configuration of an elevator heavy lifting system applied to the elevator apparatus of FIG. FIG. 3 is a schematic cross-sectional view showing the oil buffer of FIG. FIG. 4 is a diagram illustrating a schematic configuration of an elevator heavy load lifting system according to the second embodiment. FIG. 5 is a perspective view showing a mounting table of the elevator heavy load lifting system according to the third embodiment. FIG. 6 is a diagram illustrating a schematic configuration of an elevator heavy load lifting system according to the fourth embodiment. FIG. 7 is a perspective view showing a mounting table for an elevator heavy load lifting system according to the fifth embodiment.

  Hereinafter, an elevator weight lifting system and an elevator weight lifting method according to embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
The elevator heavy load lifting system and elevator heavy load lifting method according to the first embodiment will be described with reference to FIGS. 1 to 3. An elevator heavy load lifting system is a system for lifting heavy loads in an elevator hoistway. Here, as an example, a case in which a heavy object is lifted to load a heavy object (dead weight) on the car will be described, but the example of the heavy object is not limited thereto.

  First, the elevator apparatus 1 is demonstrated using FIG. The elevator apparatus 1 includes a car 3 that can move up and down in the hoistway 2 and a counterweight 5 that is connected to the car 3 via a main rope 4. Of these, the main rope 4 is wound up by a hoisting machine 6 so that the car 3 and the counterweight 5 are moved up and down. The heavy article according to the present embodiment is for increasing the tension of the main rope 4 and increasing the frictional force between the traction sheave 7 of the hoisting machine 6 and the main rope 4. As shown in FIG. 1, a compen- sation rope 8 is connected to the car 3 and the counterweight 5, and the compen- sion rope 8 is wound around a compensatory 9 provided at the lower part of the hoistway 2. It has been. Depending on the position of the car 3, the mass of the main rope 4 on the car 3 side and the mass of the main rope 4 on the counterweight 5 side may become unbalanced. Provided to counteract.

  As shown in FIG. 2, in the hoistway 2, a pair of guide rails 10 that guide the raising and lowering of the car 3 are provided. The car 3 includes a car body 3a on which a user gets on and a car frame 3b that supports the car body 3a. A car guide device 11 is provided above and below the car frame 3b. Although FIG. 1 shows an example in which the car guide device 11 includes a guide roller 11a that rolls on the corresponding guide rail 10, the present invention is not limited to this. By this car guide device 11, the car 3 moves up and down smoothly while being guided by the guide rail 10 in the hoistway 2, and arrives at a desired hall 12 among the halls 12 provided on a plurality of floors of the building. The floor is available. In FIG. 2, the lowermost hall 12 is shown.

  Next, the elevator weight lifting system 20 according to the present embodiment will be described. As shown in FIG. 2, the heavy lifting system 20 of an elevator pressurizes hydraulic oil to an oil buffer 30 provided on a floor surface 13 a of a pit 13 (lower part of the hoistway 2) and the oil buffer 30. Pressure oil supply unit 40 and a lifting platform 50 on which a heavy object W is loaded. Among these, the lifting platform 50 is placed on a plunger 32 (described later) of the oil buffer 30.

  The oil buffer 30 has a function of stopping the car 3 while mitigating a collision using the resistance of the enclosed buffer oil even when the car 3 is overrun for some reason.

  More specifically, as shown in FIG. 3, the oil buffer 30 includes a cylindrical cylinder 31 extending upward from the floor surface 13 a of the pit 13, and a plunger 32 protruding upward from the upper end portion of the cylinder 31, have. Among these, the cylinder 31 includes a cylinder chamber 31a in which buffer oil is enclosed. The cylinder chamber 31 a is provided with a cylindrical pipe 33 extending in the vertical direction, and the plunger 32 is slidable with respect to the inner surface of the pipe 33. A plurality of orifices 34 are provided in the lower portion of the pipe 33, and the cylinder chamber 31a communicates with the internal space of the pipe 33 (pipe chamber 33a).

  The cylinder 31 includes a first port 35 serving as a buffer oil outlet and a second port 36 serving as a buffer oil inlet. Among these, the first port 35 is provided in the lower part of the cylinder 31, and the second port 36 is provided in the upper part of the cylinder 31. The first port 35 and the second port 36 are closed with a plug (not shown) during normal operation of the elevator or the like.

  Buffer oil is sealed in the cylinder chamber 31a and the pipe chamber 33a, and the plunger 32 is biased upward by the pressure of the buffer oil. On the other hand, when the plunger 32 receives a downward force, the plunger 32 descends while compressing the buffer oil filled in the pipe chamber 33a. At this time, the buffer oil in the pipe chamber 33 a flows out into the cylinder chamber 31 a through the orifice 34, but the orifice 34 causes outflow resistance. In this way, the oil buffer 30 is configured to reduce the collision of the car 3. As the plunger 32 descends, the number of orifices 34 communicating with the pipe chamber 33a and the cylinder chamber 31a decreases, and the buffer oil outflow resistance increases.

  As shown in FIG. 2, the pressure oil supply unit 40 includes a liquid tank 41 (tank) that stores hydraulic oil, and an electric pump 42 that pressurizes and supplies the hydraulic oil stored in the liquid tank 41 to the oil buffer 30 ( Supply drive unit). The liquid tank 41 and the electric pump 42 are both installed at the lowest floor hall 12 and connected to each other by a supply line 43.

  As shown in FIGS. 2 and 3, the electric pump 42 is connected to the first port 35 of the oil buffer 30 via the first line 44, and hydraulic oil is supplied from the electric pump 42 to the first port 35. Is done. On the other hand, the liquid tank 41 is connected to the second port 36 of the oil buffer 30 via the second line 45, and the hydraulic oil in the cylinder chamber 31 a of the oil buffer 30 is discharged to the liquid tank 41. The liquid tank 41 may be provided with an oil cooler in order to cool the discharged hydraulic oil. Here, the hydraulic oil is oil that is sealed in the oil buffer 30 when the heavy object W is lifted. The component of the hydraulic oil is preferably the same as the component of the buffer oil described above, but in the present embodiment, as described later, when lifting the heavy load W, the cylinder of the oil buffer 30 is used. The buffer oil in the chamber 31a is discharged, and hydraulic oil is enclosed instead of the buffer oil.

  As shown in FIG. 2, a stop valve 46 is provided in the second line 45. The stop valve 46 is closed when the heavy object W is lifted. When hydraulic fluid is supplied from the electric pump 42 to the cylinder chamber 31a with the stop valve 46 closed, the pressure of the hydraulic fluid in the cylinder chamber 31a can be increased.

  As shown in FIG. 2, the lifting platform 50 includes a top plate 51 and lifting platform guides 52 provided at both ends of the top plate 51. Among these, the upper end of the plunger 32 of the oil buffer 30 abuts on the lower surface of the top plate 51, and the heavy object W is loaded on the upper surface of the top plate 51. The lifting platform guide 52 is configured to be guided by the corresponding guide rail 10. Thus, the lifting platform 50 can be moved up and down smoothly while being guided by the guide rail 10. In the present embodiment, the lifting platform guide 52 includes a pair of sliding surfaces 52 a (see FIG. 5) that can slide in contact with the guide rail 10. However, the lifting platform guide 52 may include a roller such as the guide roller 11a of the car guide device 11 described above.

  Next, the operation of the present embodiment having such a configuration will be described. Here, the elevator lifting method according to the present embodiment will be described.

  First, the car 3 is positioned at the lower part of the hoistway 2 (preferably at a position lower than the hall 12 on the lowest floor). In this case, it is positioned at a position where it does not interfere with other structures (for example, the compensatory 9 shown in FIG. 1) provided in the pit 13.

  Subsequently, the buffer oil in the cylinder chamber 31a of the oil buffer 30 is discharged. In this case, the plugs of the first port 35 and the second port 36 of the cylinder 31 are opened, and the buffer oil is discharged from the first port 35. As a result, the pressure of the buffer oil that has urged the plunger 32 upward is lowered, and the plunger 32 is lowered to its lowest point by its own weight. The discharged buffer oil is collected and stored in a container (not shown).

  On the other hand, a liquid tank 41 and an electric pump 42 of the pressure oil supply unit 40 are installed at the landing 12 on the lowest floor, and are connected to each other by a supply line 43. At this time, the hydraulic oil is stored in the liquid tank 41.

  Next, the pressure oil supply unit 40 is connected to the oil buffer 30. In this case, the electric pump 42 and the first port 35 of the oil buffer 30 are connected by the first line 44. Further, the liquid tank 41 and the second port 36 of the oil buffer 30 are connected by a second line 45 including a stop valve 46.

  Subsequently, the lifting platform 50 is placed on the plunger 32 of the oil buffer 30. At this time, the upper end of the plunger 32 is brought into contact with the lower surface of the top plate 51 of the lifting platform 50. Further, the pair of sliding surfaces 52 a of each lifting platform guide 52 is brought into contact with the corresponding guide rail 10.

  Next, the heavy object W is loaded on the lifting platform 50. In this case, first, the heavy object W is carried into the pit 13. The heavy article W is preferably carried into the pit 13 from an inspection port (not shown) provided in the pit 13. Thereafter, the loaded heavy object W is loaded on the upper surface of the top plate 51 of the lifting platform 50.

  After the heavy load W is loaded on the lifting platform 50, the hydraulic oil is pressurized and supplied from the pressure oil supply unit 40 to the oil buffer 30, and the heavy load W is lifted. In this case, the stop valve 46 is closed and the electric pump 42 is driven so that the hydraulic oil stored in the liquid tank 41 passes through the first line 44 and the first port 35 of the oil buffer 30 to the cylinder chamber 31a. To be supplied. The hydraulic oil supplied to the cylinder chamber 31a is also supplied to the pipe chamber 33a through the orifice 34. If the electric pump 42 is continuously driven, the pressure of the hydraulic oil in the cylinder chamber 31a and the pipe chamber 33a increases. As a result, the plunger 32 is pushed up under the pressure of the hydraulic oil, and the heavy object W is lifted.

  When the heavy object W reaches the target height, the heavy object W is attached to the car 3. In this case, the worker puts the heavy load W on the car 3 on an inspection table (not shown) installed in the pit 13.

  After attaching the heavy load W to the car 3, the hydraulic oil in the cylinder chamber 31a of the oil buffer 30 is discharged. More specifically, the stop valve 46 is opened, and the hydraulic oil in the cylinder chamber 31 a is discharged to the liquid tank 41 through the second port 36 and the second line 45. In this case, the hydraulic oil in the pipe chamber 33a flows out to the cylinder chamber 31a through the orifice 34. As a result, the pressure of the hydraulic oil that has pushed the plunger 32 upward decreases, and the plunger 32 is lowered to the lowest point by its own weight and the weight of the lifting platform 50.

  Next, the lifting platform 50 is removed.

  Subsequently, the supply line 43, the first line 44, and the second line 45 are removed, and the pressure oil supply unit 40 is removed from the landing 12 on the lowest floor.

  Next, buffer oil is supplied to the cylinder chamber 31 a of the oil buffer 30. As the buffer oil supplied here, it is preferable to use the buffer oil recovered before the heavy object W is lifted. After supplying a predetermined amount of buffer oil to the cylinder chamber 31a, the first port 35 and the second port 36 of the cylinder 31 are closed with plugs.

  In this way, the lifting operation of the heavy load W is completed, and the elevator is restored to a state where normal operation is possible.

  Thus, according to the present embodiment, the lifting platform 50 is placed on the plunger 32 of the oil buffer 30 provided on the floor surface 13 a of the pit 13, and the heavy object W is loaded on the lifting platform 50. The The hydraulic oil is pressurized and supplied from the pressure oil supply unit 40 to the oil buffer 30. As a result, the heavy object W can be pushed up and lifted by the pressure of the hydraulic oil supplied to the oil buffer 30. That is, even when the suspension base is not provided in the pit 13, the heavy object W can be easily lifted using the oil buffer 30 provided in advance in the pit 13. Further, it is not necessary to carry a lifting device such as a hydraulic jack into the pit 13. For this reason, the man-hour for lifting the heavy article W can be reduced.

  Moreover, according to this Embodiment, the liquid tank 41 and the electric pump 42 of the pressure oil supply part 40 are installed in the landing 12 of the lowest floor. For this reason, the liquid tank 41 and the electric pump 42 can be installed more easily than the case where the liquid tank 41 and the electric pump 42 are installed, and the man-hour for lifting the heavy load W can be further reduced.

  Further, according to the present embodiment, hydraulic oil pressurized to the oil buffer 30 by the electric pump 42 is supplied. Accordingly, the work load for pressurizing and supplying the hydraulic oil to the oil buffer 30 can be reduced, and the hydraulic oil can be easily supplied to the oil buffer 30. For this reason, the man-hour for lifting the heavy article W can be reduced further.

  Further, according to the present embodiment, the lifting platform 50 has a pair of lifting platform guides 52 guided by the guide rail 10. Thereby, the lifting platform 50 can be raised and lowered smoothly, and the heavy object W can be lifted easily.

  In the above-described embodiment, the example in which the supply drive unit that pressurizes and supplies the hydraulic oil stored in the liquid tank 41 to the oil buffer 30 includes the electric pump 42 has been described. However, the present invention is not limited to this, and the supply driving unit is optional as long as the hydraulic oil can be pressurized and supplied to the oil buffer 30. For example, the supply drive unit may include a hand pump (not shown). .

(Second Embodiment)
Next, the elevator heavy load lifting system and elevator heavy load lifting method according to the second embodiment of the present invention will be described with reference to FIG.

  The second embodiment shown in FIG. 4 is mainly different in that it further includes a pressure adjustment unit that adjusts the pressure of the hydraulic oil supplied to the oil buffer. This is substantially the same as the first embodiment shown in FIG. In FIG. 4, the same parts as those of the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 4, the elevator heavy load lifting system 20 according to the present embodiment further includes a regulator 47 (pressure adjusting unit) that adjusts the pressure of the hydraulic oil supplied to the oil buffer 30. The regulator 47 is provided on the first line 44 and is connected to the liquid tank 41 via a return line 48. The regulator 47 has a function of limiting the pressure of hydraulic oil supplied to the cylinder 31 of the oil buffer 30. That is, the regulator 47 is configured to return the hydraulic oil discharged from the electric pump 42 to the liquid tank 41 via the return line 48 when the pressure of the hydraulic oil reaches a predetermined limit value. Further, as shown in FIG. 4, the regulator 47 is installed at the landing 12 on the lowest floor in the same manner as the liquid tank 41 and the electric pump 42.

  Thus, according to the present embodiment, the pressure of the hydraulic oil supplied to the oil buffer 30 is limited by the regulator 47. As a result, it is possible to prevent the hydraulic oil pressure in the cylinder chamber 31a and the pipe chamber 33a of the oil buffer 30 from becoming excessive, and damage to the oil buffer 30 can be prevented.

(Third embodiment)
Next, the elevator heavy load lifting system and elevator heavy load lifting method according to the third embodiment of the present invention will be described with reference to FIG.

  In the third embodiment shown in FIG. 5, the lifting platform has an abutting portion that abuts on the plunger, and a loading portion that is disposed on the floor surface side of the hoistway relative to the abutting portion. The other differences are substantially the same as those of the first embodiment shown in FIGS. 1 to 3. In FIG. 5, the same parts as those of the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 5, the lifting platform 50 according to this embodiment includes a contact plate 53 (contact portion) that contacts the plunger 32 of the oil buffer 30 and a pair of stacking plates connected to the contact plate 53. 54 (loading section). Among these, the loading plate 54 is a plate on which a heavy object W is loaded, and is disposed on the floor 13 a (see FIG. 2) side of the pit 13 with respect to the contact plate 53. The lifting platform guide 52 described above is provided at the end of the loading plate 54 on the guide rail 10 side.

  The stacking plate 54 is connected to the contact plate 53 via the vertical plate 55. The end of the contact plate 53 and the end of the stacking plate 54 on the side of the guide rail 10 are connected by a beam 56 that extends obliquely, so that the strength of the lifting platform 50 is improved.

  When the lifting platform 50 shown in FIG. 5 is placed on the plunger 32 of the oil buffer 30, the upper end of the plunger 32 is brought into contact with the lower surface of the contact plate 53 of the lifting platform 50. In this case, the stacking plate 54 is disposed at a position lower than the contact plate 53. For this reason, the heavy object W carried into the pit 13 can be easily loaded on the loading plate 54. In particular, when a plurality of heavy objects W are attached to the car 3, it is preferable to equalize the mass of the heavy objects W loaded on each loading plate 54. This makes it possible to lift the heavy object W smoothly. Further, when the loading plate 54 is placed on the floor surface 13a of the pit 13 when the plunger 32 is positioned at the lowest point, the loading of the heavy object W can be further facilitated.

  As described above, according to the present embodiment, the loading plate 54 of the lifting platform 50 on which the heavy object W is loaded is located on the floor surface 13a of the pit 13 rather than the contact plate 53 with which the plunger 32 of the oil buffer 30 contacts. Arranged on the side. Thereby, the heavy load W can be easily loaded on the lifting platform 50, and the work load can be reduced. In addition, the safety of the operator can be improved.

(Fourth embodiment)
Next, an elevator weight lifting system and an elevator weight lifting method according to the fourth embodiment of the present invention will be described with reference to FIGS. 6 and 7.

  In the fourth embodiment shown in FIGS. 6 and 7, the lifting platform has an opening through which the plunger can penetrate, and a closing member that closes the opening and contacts the plunger. However, the other configuration is substantially the same as that of the first embodiment shown in FIGS. 6 and 7, the same parts as those of the first embodiment shown in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIGS. 6 and 7, the lifting platform 50 according to the present embodiment includes the top plate 51 described above, an opening 57 provided on the top plate 51 and through which the plunger 32 of the oil buffer 30 can pass, A closing plate 58 that closes the opening 57 and contacts the plunger 32. Of these, the closing plate 58 is removably attached to the lower surface of the top plate 51 with bolts (not shown). The lifting platform guides 52 described above are provided at both ends of the top plate 51.

  As shown in FIG. 6, a plurality of support columns 60 are provided on the floor surface 13 a of the pit 13. The support column 60 extends upward from the floor surface 13a. A buffer member 61 made of rubber or the like is provided at the upper end of the support column 60. The lifting platform 50 according to the present embodiment is supported by the support column 60 via the buffer member 61. That is, when the lifting platform 50 is supported by the support column 60, the lifting platform 50 can be used as an inspection platform on which an operator is placed. When the lifting platform 50 is supported by the column 60, the closing plate 58 is removed from the top plate 51, and the plunger 32 of the oil buffer 30 passes through the opening 57 of the lifting platform 50.

  When placing the lifting platform 50 supported by the support 60 on the plunger 32 of the oil buffer 30, first, the lifting platform 50 is raised until it is positioned above the upper end of the plunger 32. Subsequently, the closing plate 58 is attached to the top plate 51. Thereafter, the lifting platform 50 is lowered until the upper end of the plunger 32 comes into contact with the lower surface of the closing plate 58. In this manner, the lifting platform 50 according to the present embodiment can be placed on the plunger 32.

  After attaching the heavy load W to the car 3, the closing plate 58 is removed, and the lifting platform 50 is lowered until it comes into contact with the buffer member 61 of the column 60. At this time, the shock when the lifting platform 50 is brought into contact with the support column 60 can be reduced by the buffer member 61.

  Thus, according to the present embodiment, the lifting platform 50 has the opening 57 through which the plunger 32 of the oil buffer 30 can pass. Thereby, the lifting platform 50 can be supported by the support 60 installed in the pit 13 and can be used as an inspection table. Further, when lifting the heavy object W, the lifting platform 50 can be placed on the plunger 32 by attaching the closing plate 58 to the opening 57. For this reason, the lifting platform 50 can be used not only as a platform for lifting the heavy object W but also as an inspection table, and the versatility of the lifting platform 50 can be improved.

  According to the embodiment described above, it is possible to reduce the number of man-hours for lifting the heavy load of the elevator.

  Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. Moreover, as a matter of course, these embodiments can be partially combined as appropriate within the scope of the present invention.

2: hoistway, 3: passenger car, 10: guide rail, 13: pit, 13a: floor, 20: heavy lift system for elevator, 30: oil buffer, 32: plunger, 40: pressure oil supply unit, 41: liquid tank, 42: electric pump, 47: regulator, 50: lifting platform, 52: lifting platform guide, 53: abutment plate, 54: loading plate, 57: opening, 58: closing plate, W : Heavy goods,

Claims (7)

  An elevator heavy load lifting system for lifting a heavy load in a hoistway, an oil buffer provided on a floor surface of the hoistway, having a plunger, and pressurizing and supplying hydraulic oil to the oil buffer An elevator heavy load lifting system, comprising: a pressure oil supply unit; and a lifting platform placed on the plunger of the oil buffer, on which the heavy load is loaded.   The elevator heavy load lifting system according to claim 1, further comprising a pressure adjusting unit that adjusts a pressure of the hydraulic oil supplied to the oil buffer.   The lifting platform includes a contact portion that contacts the plunger of the oil buffer, and a loading portion that is connected to the contact portion and on which the heavy object is loaded. The elevator heavy load lifting system according to claim 1 or 2, which is disposed closer to the floor surface of the hoistway than a contact portion.   The said lifting platform has a pair of lifting platform guide part guided by the guide rail provided in the said hoistway, The heavy lifting of the elevator as described in any one of Claim 1 thru | or 3 Heavy system.   The said lifting stand has the opening part which the said plunger of the said oil buffer can penetrate, and the obstruction | occlusion member which the said plunger contact | abuts while closing the said opening part. The elevator heavy load lifting system according to one item.   The pressure oil supply unit includes a tank that stores hydraulic oil, and a supply drive unit that pressurizes and supplies the hydraulic oil stored in the tank to an oil buffer, and the tank and the supply drive unit are The elevator heavy load lifting system according to claim 1, which is installed at a landing on a lower floor.   A lifting method for lifting heavy objects in a hoistway, the step of connecting a pressure oil supply unit to an oil buffer provided on the floor of the hoistway, and a plunger of the oil buffer A step of placing a lifting platform; a step of loading the heavy load on the lifting platform; and pressurizing and supplying hydraulic oil from the pressure oil supply section to the oil buffer to lift the heavy load. And a method of lifting an elevator weight.

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