JP2013023348A - Elevator lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator lifting device with superior responses when an elevator car where a hydraulic unit can be installed starts to rise.SOLUTION: A tank 41, a pump 42 and a motor 43 are provided as a hydraulic unit 4, a control part for controlling a vertical lifting speed of the elevator car by changing the rotation speed of the motor 43 and adjusting the supply amount of oil by the pump 42 is provided, and the tank 41 is arranged at a higher level than the pump 42.

Description

  The present invention relates to an elevator lifting device.

  Conventionally, as shown in FIG. 5, an elevator elevating apparatus (see, for example, Patent Document 1) has a hoistway 1 formed vertically in a building, and an elevator car 2 is provided in the hoistway 1 so as to be movable up and down. . A drive unit including a hydraulic unit 4 and a hydraulic jack 3 for driving the elevator car 2 up and down is provided at the bottom of the hoistway 1. A pair of guide rails 12 are erected upward at the bottom of the hoistway 1, and the hydraulic jack 3 is installed between the guide rails 12. A platform 21 that supports the car portion 22 of the elevator car 2 is attached to the upper end portion of the rod of the hydraulic jack 3, and the platform 21 can slide up and down on the guide rail 12.

  As shown in FIG. 6, the hydraulic unit 4 includes a tank 41 that stores oil, a pump 42, a motor 43 that drives the pump 42, and a speed control switching valve 46 in a casing 40. An oil feed path 44 is connected between these and between the speed control switching valve 46 and the hydraulic jack 3. In addition, the code | symbol 45 in FIG. 6 is a cutoff valve which prevents the back flow to the tank 41, and the code | symbol 47 is a surge tank.

  And the tank 41 was arrange | positioned below. That is, if the tank 41 is arranged at the upper side, when the oil leaks from the tank 41, the oil adheres to the equipment below the tank 41 and becomes dirty, so the tank 41 is arranged below the other equipment. It was something.

Japanese Patent Laid-Open No. 5-254741

  When the elevator car 2 rises, the pump 42 sucks up the oil in the lower tank 41 and conveys it to the hydraulic jack 3. However, the conventional elevator lifting device has a problem that the response when the elevator car 2 starts to rise is not good because the tank 41 is disposed below the pump 42.

  The present invention has been invented in view of the above-described conventional problems, and an object of the present invention is to provide an elevator lifting device having a good response when the elevator car starts to rise. is there.

  In order to solve the above problems, the present invention has the following configuration.

  A hydraulic jack that drives the elevator car up and down in the hoistway, a tank that stores oil supplied to the hydraulic jack, a pump that supplies oil from the tank to the hydraulic jack, and a motor that operates the pump; An elevator lifting device including the tank, the pump, and the motor as a hydraulic unit, comprising an oil feeding path for sending oil from the tank to the pump, wherein the tank is higher than the pump And a controller for controlling the vertical lift speed of the elevator car by adjusting the amount of oil supplied by the pump by changing the rotational speed of the motor.

  The tank is provided with a suction pipe for carrying out the oil in the tank. The suction pipe has a suction port located above the bottom surface of the storage space in the tank, and the suction direction is lateral. It is preferable to be provided in a direction.

  In addition, the tank, the motor, and the pump are provided in order from above in the casing of the hydraulic unit so that the casing is formed in a vertically long shape, and the casing moves up and down the side wall of the hoistway and the elevator car. It is preferable to be installed between the areas.

  In addition, it is preferable that a detection unit that detects the vertical elevation speed of the elevator car is provided, and the control unit performs feedback control by changing the rotation speed of the motor based on the speed detected by the detection unit.

  Moreover, it is preferable that the control box which incorporates the said control part is installed between the inner surface of the side wall of the said hoistway, and the raising / lowering area | region of the said elevator car.

  The elevator lifting device of the present invention has a good response when the elevator car starts to rise.

The hydraulic unit which saw through the inside in one embodiment of the present invention is shown, (a) is a front view, (b) is a side view, (c) is a top view, (d) is a bottom view. is there. It is a plane sectional view of an embodiment same as the above. It is a perspective view of the door on the building side of a guide rail, an elevator car (except for an opening / closing door), a drive unit, a control box, and a landing in the same embodiment. It is a sectional side view of the part which formed the pit of the hoistway in embodiment same as the above. It is a schematic perspective view of the conventional elevator raising / lowering apparatus. It is a block diagram of the drive device of an elevator raising / lowering apparatus same as the above. It is side sectional drawing of the part which formed the pit of the hoistway same as the above.

  Hereinafter, an elevator lifting apparatus according to the present invention will be described based on an embodiment shown in the accompanying drawings.

  As shown in FIGS. 2 and 3, the elevator elevating device includes a hoistway 1, an elevator car 2, and a driving device. The hoistway 1 is a closed space having a substantially rectangular shape in plan view, which is formed so as to communicate with a building 6 and an elevator building over a plurality of upper and lower floors, and the elevator car 2 moves up and down in this closed space. On the side wall of the hoistway 1, a building-side opening 62 is formed at a position corresponding to the floor of the building, and a landing 61 is formed outside the building-side opening 62. A building-side rail 63 is provided above and below the building-side opening 62, and a building-side door 64 is provided so as to be movable left and right between the upper and lower building-side rails 63. The left and right lengths of the building-side rail 63 are longer than the left and right widths of the building-side opening 62, and a portion separated from the building-side opening 62 is a door pocket portion 65. A door driving device (not shown) for driving the building-side door 64 is accommodated in the door pocket portion 65. From the bottom of the hoistway 1, a pair (two) of guide rails 12 are erected upward. In the present embodiment, as shown in FIG. 2, they protrude from the bottom of the hoistway 1. A guide rail 12 is attached to the column 11. The guide rails 12 may be provided in any number instead of a pair.

  As shown in FIGS. 2 and 3, the elevator car 2 has a substantially rectangular shape in plan view composed of a platform 21 and a car portion 22 mounted and supported on the platform 21. It is. The platform 21 includes a substantially rectangular side frame that is laid between a pair of guide rails 12 and that is slidable up and down, and a substantially rectangular lower frame that protrudes in a substantially horizontal direction from the lower end of the side frame. The side view is substantially L-shaped. The shape of the platform 21 is not limited. For example, the platform 21 may have an upper frame and may not have a substantially L shape in a side view. Guided portions (not shown) that are slidably fitted to the guide rails 12 are provided at both ends of the side frames, and the side frames are slidable up and down between the guide rails 12 via the guided portions. And the cage | basket part 22 is mounted and fixed to a lower frame. The cage portion 22 has a rectangular box shape on which a person load is placed, and an entrance / exit opening portion 23 is formed on one surface, and a door rail 24 is provided.

  The door rail 24 is provided above and below the entrance / exit opening 23, and an open / close door 25 is provided so as to be movable left and right between the door rail 24. It is provided over the length (namely, the length of a door pocket part) extended to the width | variety of the opening / closing door 25 on either side. The open / close door 25 is composed of a plurality of pieces (three in this embodiment), and the length of the door pocket is substantially the length of one of the open / close doors 25. Thereby, the door rail 24 will be in the state which protrudes by the length of a door pocket part on either side of the cage | basket part 22. The door pocket portion of the car portion 22 and the door pocket portion 65 on the landing 61 side are formed to have substantially the same length. When the car portion 22 is positioned at the landing 61 on each floor of the hoistway 1, the door rail 24 is positioned so as to be adjacent to the building-side rail 63 provided on the floor.

  The drive device drives the elevator car 2 up and down, and includes a hydraulic jack 3 and a hydraulic unit 4.

  The hydraulic jack 3 has a plurality of stages of cylindrical rods (cylinders), and each rod protrudes and retracts with respect to the rod on the outer side so that it can expand and contract vertically. May not be a cylinder. The lowermost cylinder 32 has an oil port (not shown) through which oil flows into and out of the cylinder 32.

  The hydraulic jack 3 is installed between the pair of guide rails 12 in this embodiment, and the upper end of the uppermost rod 31 is fixed to the upper part (preferably the upper end) of the side frame of the platform 21 of the elevator car 2. Is done.

  As shown in FIG. 1, the hydraulic unit 4 includes a tank 41, a pump 42, a motor 43, and an oil feed path 44. In the present embodiment, the hydraulic unit 4 and the shutoff valve 45 are further provided in the casing 40. Is housed.

  The tank 41 is a sealed container that stores oil supplied to the hydraulic jack 3, and an opening that communicates with the oil feeding path 44 is formed on the side wall so that the suction pipe 48 projects into the storage space in the tank 41. Provided. As shown in FIG. 1, the suction pipe 48 has the suction direction (arrow in FIG. 1) in the horizontal direction, and the suction port (lower end) at the end is located above the bottom surface of the storage space. . As elevator elevators are used for many years, dirt such as dust and sand is mixed in the oil. The dust mixed in the oil accumulates in the tank 41, but the dust accumulated in the tank 41 rises when the oil returns to the tank 41. At this time, if the suction port faces upward, the dust that has risen falls into the suction port and is transported toward the hydraulic jack 3, which may adversely affect equipment provided in the middle of the oil feeding path 44. There is. For this reason, the suction direction is directed sideways so that the dust that has risen does not fall into the suction port. Further, the closer the suction port is to the bottom surface of the storage space, the easier the dust collected on the bottom surface is sucked. However, if it is far from the bottom surface, the oil below the suction port is not sucked and is stored. For this reason, the suction port is located at a slight distance (about several cm) from the bottom surface.

  The oil feeding path 44 is a path for oil to be transported between the tank 41 and the oil port of the hydraulic jack 3, and a flexible pipe is preferably used, but it may not be a flexible pipe and is not particularly limited. . The pump 42 is provided in the middle of the oil feeding path 44 and is driven by a motor 43 to convey oil. The shut-off valve 45 prevents the elevator car 2 from descending beyond the normal speed range, and can prevent the oil from flowing backward from the hydraulic jack 3 to the tank 41.

  In the present embodiment, the tank 41, the motor 43, and the pump 42 are arranged vertically in the casing 40, and in particular, the tank 41 is arranged higher than the pump 42. In the present embodiment, in order from the top. A tank 41, a motor 43, and a pump 42 are provided, and the casing 40 is formed in a vertically long shape.

  When the elevator car 2 rises, the pump 42 sucks up the oil in the tank 41 and transports it to the hydraulic jack 3. Whether or not the oil is transported early, particularly when the elevator car 2 starts to rise. But it affects the initial movement. In the present embodiment, since the tank 41 is arranged higher than the pump 42 and the head pressure is always applied to the pump 42, when the elevator car 2 starts to rise, the oil is conveyed from the pump 42. It takes place early and the elevator car 2 is raised quickly.

  In the present embodiment, the vertical elevator speed of the elevator car 2 is controlled by changing the rotational speed of the motor 43 and adjusting the amount of oil supplied by the pump 42. The inverter control controls the elevator car 2. The vertical movement speed is controlled. The inverter control is well known and will not be described in detail, and various specific forms of inverter control are applicable and are not particularly limited. In the present embodiment, a control unit including a microcomputer for inverter control is provided in the control box 5.

  Moreover, in this embodiment, the detection part (not shown) which detects the raising / lowering speed of the elevator car 2 is provided in the elevator raising / lowering apparatus. Various detectors such as a pickup made of a piezoelectric element or the like for detecting acceleration and a calculation unit for calculating speed based on acceleration information from the pickup are used as appropriate, and are not particularly limited. The control unit performs feedback control that sets the rotation speed of the motor 43 to a predetermined speed based on the speed obtained from the detection unit. Thereby, compared with the case where feedback control is not performed, acceleration / deceleration becomes gentle and the elevator car 2 is lifted and lowered smoothly.

  In particular, when feedback control is performed, the response is greatly influenced by whether or not the oil is transported early. However, in the present embodiment, the tank 41 is arranged higher than the pump 42, so the feedback control is performed. The response at is good.

  In the present embodiment, as shown in FIG. 2, in the plan view, the left and right outer surfaces of the car portion 22 protrude from the outer surface 221 on the side from which the door rail 24 protrudes and the car portion 22 of the door rail 24. The hydraulic unit 4 is installed in a region 26 having a substantially rectangular shape with the portion 241 as a side. The whole hydraulic unit 4 may not be installed in the region 26 as a whole, but approximately 80% or more (preferably 90% or more) of the hydraulic unit 4 in the plan view is installed in the region 26. The remaining portion that is not installed in the region 26 is installed between the elevator region 10 where the elevator car 2 is located in plan view and the inner surface of the side wall 1a of the hoistway 1.

  As shown in FIG. 4, a pit 13 that is recessed downward from the surface of the landing 61 on the lowermost floor is provided on the bottom of the hoistway 1. In the conventional elevator lifting device, the speed control switching valve 46 occupies a large area in a plan view, and when the casing 40 is elongated vertically, the volume becomes enormous. The equipment was installed side by side. For this reason, the horizontally long casing 40 cannot be installed in a narrow space in a plan view like the region 26, but is installed in the pit 13 below the lifting region 10, and the pit 13 is deep (for example, 550 mm). To the extent).

  On the other hand, in the present embodiment, the casing 40 is formed in a vertical shape and is installed in the region 26. Therefore, the casing 40 does not need to be installed in the pit 13, and the depth of the pit 13 is larger than that of a conventional elevator lifting device. It can be significantly shallower (for example, about 200 mm). This eliminates the time and labor required for forming the pits 13. In particular, when an elevator is installed at the time of renovation, heavy machinery cannot be carried in to form the pits 13 and it is difficult to form deep pits 13, but in this embodiment, even indoors where heavy machinery cannot be carried in manually. A shallow pit 13 may be formed.

  Further, conventionally, as shown in FIG. 5, the horizontally long casing 40 is installed away from the hydraulic jack 3, and the oil feeding path 44 between the casing 40 and the hydraulic jack 3 is long. On the other hand, in the present embodiment, the vertical casing 40 can be installed adjacent to the hydraulic jack 3, and the length of the oil feed path 44 between the casing 40 and the hydraulic jack 3 can be short.

  In this embodiment, as shown in FIGS. 2 and 3, a front plate 66 facing the landing 61 of the door pocket portion 65 is provided so as to be openable and closable, and the door pocket portion 65 communicates with the hoistway 1 on the back. It becomes a mouth. Thereby, the inspection in the hoistway 1 including the hydraulic unit 4 and the control box 5 is easily performed.

DESCRIPTION OF SYMBOLS 1 Hoistway 12 Guide rail 2 Elevator car 21 Platform 22 Car part 23 Entrance / exit part 24 Door rail 25 Open / close door 3 Hydraulic jack 4 Hydraulic unit 40 Casing 41 Tank 42 Pump 43 Motor 44 Oil supply path 45 Shut-off valve 48 Suction pipe 5 Control Box 6 Building 61 Platform 62 Building-side opening 63 Building-side rail 64 Building-side door

Claims (5)

  A hydraulic jack that drives the elevator car up and down in the hoistway, a tank that stores oil supplied to the hydraulic jack, a pump that supplies oil from the tank to the hydraulic jack, and a motor that operates the pump; An elevator lifting device including the tank, the pump, and the motor as a hydraulic unit, comprising an oil feeding path for sending oil from the tank to the pump, wherein the tank is higher than the pump An elevator lifting apparatus, comprising: a controller that controls the vertical lifting speed of the elevator car by adjusting the amount of oil supplied by the pump by changing the rotational speed of the motor.   The tank is provided with a suction pipe for carrying out the oil in the tank. The suction pipe has a suction port located above the bottom surface of the storage space in the tank, and the suction direction is a lateral direction. The elevator elevating device according to claim 1, wherein the elevator elevating device is provided.   In the casing of the hydraulic unit, the tank, the motor, and the pump are provided in order from the top so that the casing is formed in a vertically long shape, and the casing includes an inner surface of a side wall of the hoistway and a lift area of the elevator car. The elevator elevating device according to claim 1 or 2, wherein the elevator elevating device is installed between.   2. A detection unit that detects a vertical elevation speed of the elevator car, and the control unit performs feedback control by changing a rotation speed of the motor based on a speed detected by the detection unit. The elevator raising / lowering apparatus as described in any one of thru | or 3.   The elevator lifting / lowering according to any one of claims 1 to 4, wherein a control box containing the control unit is installed between an inner surface of a side wall of the hoistway and a lifting / lowering region of the elevator car. apparatus.

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