JP5886607B2 - Elevator car stop device - Google Patents

Description

  The present invention relates to an elevator car stop device for stopping an elevator car above a work pit.

  Conventionally, a work pit is provided at a lower end portion of a hoistway where an elevator car moves up and down (see, for example, Patent Document 1).

  The elevator apparatus described in Patent Document 1 includes a car that can be raised and lowered, a hoistway that accommodates the car inside, and a pit that is provided at the lower part of the hoistway to secure a work space. The elevator apparatus further includes a stopper for preventing the car from being lowered below a predetermined position.

  In the elevator apparatus described in Patent Document 1, when an operator enters the pit and performs work or inspection, the worker projects the stopper toward the car and places the car on the stopper by manual operation. Then, the limit switch interlocked with the movement of the stopper is activated, thereby trying to lock the electric control.

Japanese Patent Laid-Open No. 03-56378

  By the way, the elevator apparatus of patent document 1 makes a stopper project to the car side, and moves a car manually on this stopper, and keeps the position of a car. Further, in this elevator apparatus, since the car is still placed on the stopper during the work, it is necessary to manually wind the car and switch the stopper to the non-projecting state after the work.

  That is, the elevator apparatus described in Patent Document 1 can manually operate the car even when the stopper protrudes toward the car. However, if the car can be moved freely by manual operation during the work, the worker may not be able to work with peace of mind.

  This invention is made | formed in view of the said situation, The place made into the objective is providing the elevator car stop apparatus which can improve the safety | security of the operation | work in a work pit more.

The elevator car stopping device of the present invention includes an elevator car, a hoistway that accommodates the elevator car inside and is movable in the vertical direction, a hydraulic jack that drives the elevator car up and down in the hoistway, A tank for storing oil to be supplied to the hydraulic jack, a pump for supplying oil stored in the tank to the hydraulic jack, a motor for operating the pump, a controller for controlling driving of the motor, Manual operation switching means for switching the motor drive by the control unit from automatic control to manual control, a work pit provided at the lower end of the hoistway, and a work height of the work pit, A stop device for stopping the elevator car at least above a predetermined dimension from the bottom of the work pit, the stop device comprising the work pit A movement restriction state that is provided above a predetermined dimension from the bottom and protrudes on the movement locus of the elevator car to prevent passage of the elevator car, and a movement permission state in which the support portion does not protrude on the movement locus of the elevator car Stopper means for switching to any of the states, and when the stopper means is in a movement restricted state, both automatic control and manual control by the control unit are stopped, and the elevator car is placed between the support unit and characterized in that it has a control stop means for Ru is stopped through the gap.

Further, in this elevator car stop device, the stopper means includes a contact-type sensor that comes into contact with the support portion in a movement-permitted state and is not in contact with the support portion in a movement-restricted state, and the control stop means includes the contact It is preferable to control to stop the driving of the motor based on a detection signal from the type sensor.

  According to the elevator car stopping device of the present invention, the safety of work in the work pit can be further improved.

It is the perspective view which a part of the elevator car stop device of this embodiment abbreviate | omitted. It is a horizontal sectional view of the elevator car stop device of this embodiment. It is explanatory drawing of the hydraulic unit of this embodiment, (a) is a front view (b), a side view (c) is a top view (d) is a bottom view. It is a schematic block diagram of the hydraulic unit and hydraulic jack of this embodiment. It is the schematic which shows the work pit vicinity of this embodiment. It is a movement control device of a stop device of this embodiment, (a) is a front view (b) is a plan view. In the elevator car stop device of this embodiment, the support part of the movement restricting device is a plan view in a movement restricted state, and the car part is omitted.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  As shown in FIG. 1, the elevator car stop device of the present embodiment includes an elevator car 1, a hoistway 3 that accommodates the elevator car 1, and a drive device 4 that drives the elevator car 1 in the vertical direction. It has.

  The hoistway 3 is configured such that the elevator car 1 can move up and down. As shown in FIG. 2 and the like, the hoistway 3 is a closed space that has a substantially rectangular shape in plan view and is long in the vertical direction. The hoistway 3 is formed so as to communicate with a plurality of upper and lower floors inside a building or an elevator building. As shown in FIG. 1, the hoistway 3 is provided at a plurality of locations on the side wall so that openings 31 corresponding to the respective floors are arranged in the vertical direction. The opening 31 is provided at a location that substantially matches the building-side opening 90 provided on each floor of the building frame. A landing 95 is formed outside the opening 90 on the building side for carrying a cargo in the elevator car 1 (see FIG. 5).

  The building-side opening 90 is provided with rails 91 at both upper and lower edges. An outer door 92 is provided between the rails 91 facing in the vertical direction so as to be movable in the horizontal direction. The length of the rail 91 in the left-right direction is longer than the length in the left-right direction of the opening 90 on the building side. A portion of the rail 91 that is out of the opening 90 on the building side is disposed adjacent to a door pocket portion 93 that houses the outer door 92. The door pocket portion 93 is provided with a door driving device (not shown) for opening and closing the outer door 92 therein.

  The hoistway 3 includes a work pit 32 provided at the lower end thereof. The work pit 32 is a work space that is recessed downward for maintenance and inspection of the drive device 4 and the like. The bottom of the work pit 32 is formed below the landing 95 on the lowest floor (for example, about 200 mm below the landing 95).

  The hoistway 3 has a guide rail 33 that guides the vertical movement of the elevator car 1. The guide rail 33 is formed over substantially the entire length from the lower end of the hoistway 3 to the upper end. As shown in FIG. 2, the guide rail 33 is attached to a column 34 erected vertically in the hoistway 3. The guide rail 33 of the present embodiment is configured by a pair of rail members 330 that are spaced apart in the horizontal direction. The rail member 330 of this embodiment is formed in a substantially T-shaped cross section. In addition, although the guide rail 33 of this embodiment is comprised by a pair of rail member 330, for example, one may be sufficient and three or more may be provided.

  As shown in FIG. 1, the elevator car 1 includes a platform 11 that slides along a guide rail 33, and a car portion 14 that is supported by the platform 11.

  The platform 11 includes a side frame 12 provided between a pair of guide rails 33 and slidable in the vertical direction, and a lower frame 13 protruding from the lower end portion of the side frame 12 toward the car portion 14. (See FIG. 7). The platform 11 is provided with a side frame 12 and a lower frame 13 integrally, and has a substantially L shape when viewed from the front. The side frame 12 is provided with guided portions (not shown) that are slidably fitted into the guide rails 33 at both ends in the longitudinal direction in plan view. The side frame 12 is slidably attached between the guide rails 33 through the guided portion. The lower frame 13 is disposed below the car portion 14. In other words, the car portion 14 is placed on the lower frame 13, thereby supporting the car portion 14 from below.

  The cage portion 14 is formed in a rectangular box shape. The cage portion 14 is loaded with, for example, a person load. The car portion 14 is fixed to the platform 11 while being supported by the lower frame 13 of the platform 11. The car portion 14 has an opening / closing portion 15 formed on one side surface. A car-side door rail 16 is attached to the entrance / exit opening 15.

  The car-side door rails 16 are provided at both upper and lower edges of the entrance / exit opening 15. As shown in FIG. 2, an inner door 17 is provided between the car-side door rails 16 so as to be movable in the left-right direction along the car-side door rail 16. The car-side door rail 16 is formed to have a length that is extended in the width dimension of the entrance / exit opening 15 by about the width dimension of the inner door 17 toward either the left or right of the car section 14. A portion of the car-side door rail 16 that is separated from the entrance / exit opening 15 is disposed adjacent to the door pocket 18 that houses the inner door 17. The door bag portion 18 is provided with a door driving device (not shown) for opening and closing the inner door 17 therein. When the elevator car 1 stops at the landing 95 on each floor of the hoistway 3, the car-side door rail 16 is positioned adjacent to the building-side rail 91 on that floor.

  Each of the inner door 17 and the outer door 92 is composed of a plurality (three in this embodiment). The inner door 17 and the outer door 92 are arranged such that a plurality of the inner door 17 and the outer door 92 overlap each other. The inner door 17 and the outer door 92 are configured such that a plurality of inner doors 17 and the outer door 92 are slidable in the left-right direction so that they can expand and contract as a whole. The inner door 17 and the outer door 92 are formed so that the width of one sheet is substantially the same as the width of the door pockets 18 and 93. In other words, the door pocket portion 18 on the side of the car portion 14 and the door pocket portion 93 on the side of the landing 95 are formed to have substantially the same length.

  The drive device 4 drives the elevator car 1 in the hoistway 3 in the vertical direction. As shown in FIG. 1, the drive device 4 includes a hydraulic jack 5 connected to the platform 11 and a hydraulic unit 6 that operates the hydraulic jack 5.

  The hydraulic jack 5 includes a plurality of stages of cylindrical rods 51 (in other words, cylinders). The hydraulic jack 5 can be expanded and contracted up and down as each rod 51 advances and retreats with respect to the rod 51 just outside thereof. The uppermost rod 51 of the hydraulic jack 5 may not be a cylinder. An oil port (not shown) for allowing oil to flow into and out of the cylinder is formed in the lowermost cylinder.

  The hydraulic jack 5 is installed between the pair of guide rails 33. In the hydraulic jack 5, the upper end of the uppermost rod 51 is fixed to the upper part (preferably the upper end) of the side frame 12 of the platform 11 of the elevator car 1.

  As shown in FIGS. 3 and 4, the hydraulic unit 6 includes a tank 61, a pump 62, a motor 63, an oil feeding path 64, and a cutoff valve 65. In the hydraulic unit 6, each device is accommodated in the casing 66.

  The tank 61 stores oil supplied to the hydraulic jack 5. The tank 61 contains oil and is sealed. The tank 61 has an opening communicating with the oil feeding path 64 on the side wall thereof.

  The oil feeding path 64 is a path for transporting oil between the tank 61 and the oil port of the hydraulic jack 5. The oil feeding path 64 is preferably a flexible tube. The oil feeding path 64 may not be a flexible tube and is not particularly limited.

  The pump 62 is provided in the middle of the oil feeding path 64. The pump 62 is driven by the motor 63 to convey oil. In other words, the motor 63 operates the pump 62. The pump 62 and the motor 63 may be integrated or separate.

  The shut-off valve 65 prevents the elevator car 1 from descending beyond the normal speed range. The shutoff valve 65 prevents oil from flowing back from the hydraulic jack 5 to the tank 61. The shut-off valve 65 of this embodiment is composed of two check valves. Of the two check valves, the shutoff valve 65 has a check valve on the hydraulic jack 5 side as a main check valve and a check valve on the tank 61 side as a sub check valve.

  As shown in FIG. 3, the hydraulic unit 6 of the present embodiment is arranged in a casing 66 in a state where a tank 61, a motor 63, and a pump 62 are arranged in the vertical direction. In the hydraulic unit 6 of this embodiment, the tank 61 is disposed above the pump 62. Specifically, the hydraulic unit 6 is arranged in the order of the tank 61, the motor 63, and the pump 62 in order from above, and the casing 66 is formed to be vertically long. In other words, the hydraulic unit 6 of the present embodiment is a vertical hydraulic unit 6.

  As shown in FIG. 1, the hydraulic unit 6 having such a configuration is disposed between the guide rails 33 on the work pit 32. In other words, as shown in FIG. 2, the hydraulic unit 6 is accommodated and disposed in a gap between the side surface of the door bag side 18 of the car portion 14 and the hoistway 3. The hydraulic unit 6 is installed such that its longitudinal direction is along the vertical direction. Accordingly, the hydraulic unit 6 is arranged so as not to interfere with the elevator car 1.

  The elevator car stopping device of the present embodiment includes a control unit 21 that controls the driving of the motor 63. The controller 21 adjusts the amount of oil supplied to the hydraulic jack 5 of the pump 62 by controlling the drive of the motor 63 by inverter control. In other words, the control unit 21 controls the vertical lifting speed of the elevator car 1. The control unit 21 of the present embodiment is configured by a computer having a microprocessor as a main component, thereby performing inverter control of the motor 63. As shown in FIG. 1, the control unit 21 is provided in a control box 2 provided in parallel with the hydraulic unit 6.

  The inverter control is known and will not be described in detail. Various specific forms of inverter control are applicable and are not particularly limited.

  The control unit 21 can select two modes, an automatic control mode for automatically controlling the driving of the motor 63 and a manual control mode for driving the motor 63 by manual operation. The selection between the automatic control mode and the manual control mode is normally the automatic control mode, and is switched to the manual control mode by operating the manual operation switching means. The manual operation switching means of the present embodiment is configured by a switching button provided at a position operable from the work pit 32. Specifically, the switching button of this embodiment is provided in the control box 2.

  In the automatic control mode, the control unit 21 controls the movement of the elevator car 1 by operating a call button installed on each floor. In the automatic control mode, the control unit 21 automatically controls the lifting speed of the elevator car 1 as described above.

  When the manual control mode is selected, the control unit 21 accepts a control signal only by an operation with the up / down movement operation button operable from the work pit 32. In other words, in the manual control mode, the control unit 21 performs control such that only the elevator car 1 is moved up and down manually, and driving such as opening and closing of the door is not performed.

  The elevator car stop device of the present embodiment is provided with a stop device 7 for preventing the elevator car 1 from falling during work in the work pit 32. The stop device 7 stops the elevator car 1 at least a predetermined dimension above the bottom of the work pit 32 (1200 mm from the bottom in the present embodiment).

  The stop device 7 of the present embodiment includes a stopper means 71 configured by the movement restricting device 8 and a control stop means 73 that stops all the control of the control unit 21.

  The movement restricting device 8 mechanically prevents the elevator car 1 from falling. As shown in FIG. 6, the movement restricting device 8 includes a support portion 81 that can move forward and backward on the movement locus of the elevator car 1, and a contact sensor 82.

  The support part 81 is rotatably attached to both guide rails 33. Each support portion 81 includes a side surface portion 810 along the outer surface of the guide rail 33, and a car receiving portion 811 that protrudes from the side surface portion 810 in a right angle direction. The support portion 81 is configured by a shaft hole portion 812 for rotatably connecting to the guide rail 33 on the side surface portion 810, and a 1/4 arc-shaped long hole centering on the shaft hole portion 812. A guide hole 813 is provided.

  The support portion 81 is attached to the guide rail 33 via two shaft portions 814 that are inserted through the shaft hole portion 812 and the guide hole portion 813, respectively. Thereby, the support part 81 is rotatably attached to the guide rail 33. The support portion 81 is rotated by the guide hole portion 813 between a movement restriction state in which the car receiving portion 811 is in a horizontal state and a movement permission state in which the car receiving portion 811 is in a vertical state.

  In the movement restricting device 8, when the support portion 81 is positioned in the movement restricted state, the support portion 81 protrudes on the movement locus of the elevator car 1. Further, in the movement restriction device 8, when the support portion 81 is positioned in the movement permitted state, the support portion 81 does not protrude on the movement locus of the elevator car 1. In other words, the movement restriction device 8 blocks the passage of the elevator car 1 in the movement restricted state. Moreover, the movement control apparatus 8 permits passage of the elevator car 1 in the movement permitted state. As described above, the movement restriction device 8 of the present embodiment is configured to be switchable between the movement restriction state and the movement permission state.

  The movement restriction device 8 of the present embodiment includes a fixing unit 83 that fixes the support portion 81 in the movement restriction state or the movement permission state to the guide rail 33. The fixing means 83 is constituted by, for example, a butterfly bolt 831 and a nut 832. The nut 832 protrudes from the surface of the side surface portion 810 on the guide rail 33 side, and abuts or faces the end edge of the guide rail 33. As a result, the fixing means 83 of the present embodiment holds the rotational position.

  As shown in FIG. 1, the movement restricting device 8 is attached above the bottom of the work pit 32 by a predetermined dimension. Specifically, the movement restricting device 8 is arranged such that the car receiving portion 811 of the support portion 81 in the movement restricted state is positioned at least 1200 mm above the bottom of the work pit 32. In addition, the movement control apparatus 8 of this embodiment is located above the height of the landing 95 on the lowest floor.

  The contact sensor 82 of the movement restricting device 8 is attached to the guide rail 33 via a fixed bracket 84 as shown in FIG. The contact type sensor 82 of this embodiment is configured by a limit switch 821. The contact sensor 82 detects the state of the support part 81 (movement restriction state and movement permission state). When the car receiving portion 811 of the support portion 81 stands up, the contact sensor 82 is pressed by the car receiving portion 811 and the contact is turned ON (indicated by an imaginary line in FIG. 6). Further, in the contact sensor 82, when the support portion 81 is rotated from this state and the car receiving portion 811 is in a horizontal state, the car receiving portion 811 is brought into a non-contact state and the contact is turned off. Note that the lever of the limit switch 821 is always biased to the OFF side.

  The contact sensor 82 is arranged so as to be aligned in the horizontal direction with respect to the support portion 81, and is not located below the support portion 81. The contact sensor 82 is provided on the opposite side of the guide rail 33 from the moving side of the elevator car 1.

  The control stop unit 73 is configured by the control unit 21 that controls the motor 63 to stop based on a detection signal from the contact sensor 82 of the movement restriction device 8. The control unit 21 is electrically connected to the contact sensor 82.

  When the ON signal of the contact sensor 82 is input, the control unit 21 determines that the support unit 81 is in the movement permitted state, and sets the motor 63 in a drivable state. In other words, the control part 21 makes the elevator car 1 movable when the movement restricting device 8 is set in the movement-permitted state. When the ON signal of the contact sensor 82 is cut off (when the OFF signal is input), the control unit 21 determines that the support unit 81 is in the movement restriction state, and is in the automatic control mode or the manual control mode. Regardless, the drive of the motor 63 is stopped. In other words, when the movement restriction device 8 is placed in the movement restricted state, the control unit 21 stops both automatic control and manual control by the control unit of the elevator car 1.

  The elevator car stopping device having such a configuration is used as follows, for example. When the worker performs maintenance or inspection work in the work pit 32, the operator first operates the manual operation switching means to switch the elevator car control to the manual control mode.

  The operator operates the up / down movement operation button to move the elevator car 1 to an arbitrary up / down position that is not located on the rotation trajectory of the support portion of the movement restriction device 8.

  Thereafter, the operator rotates the support portion 81 of the movement restriction device 8 to switch the movement restriction device 8 to the movement restriction state. Then, the control unit 21 stops driving the motor 63. At this time, the movement restricting device 8 constituting the stopper means 71 projects the support portion 81 below the stopped elevator car 1 through a gap. Thereby, even if the elevator car 1 falls, it can be controlled to drop downward from the support portion 81.

  As described above, the elevator car stopping device of the present embodiment stops any control regardless of automatic control or manual control when the support portion 81 of the movement restricting device 8 is switched to the movement restricting state. For this reason, the elevator car stop device of the present embodiment can ensure the safety of the worker who works in the work pit 32 more reliably.

  Moreover, since the stop device of the present embodiment allows manual operation again when the support portion 81 in the movement restricted state is switched to the movement permitted state, the operator can ensure safety while staying in the work pit. However, the elevator car 1 can be moved as needed. Thereby, workability | operativity can be improved further.

  Further, the elevator car stopping device of the present embodiment includes a contact sensor 82 in which the movement restricting device 8 comes into contact with the support portion 81 in the movement permitted state and is not in contact with the support portion 81 in the movement restricted state. For this reason, even if a large load such as the elevator car 1 is applied to the support portion 81, the contact sensor 82 can be hardly affected. In particular, the contact type sensor 82 of the present embodiment is arranged so as to be aligned in the horizontal direction with respect to the support portion 81 and is not positioned below. The contact sensor 82 is disposed on the side opposite to the elevator car 1 side with respect to the guide rail 33. For this reason, it is hard to be influenced by the load of the elevator car 1.

  The elevator car stopping device of the present embodiment is provided with a detection unit (not shown) that detects the vertical elevation speed of the elevator car 1. Various detectors may be used as appropriate, 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. The control unit 21 performs feedback control that sets the rotation speed of the motor 63 to a predetermined speed based on the speed information input from the detection unit. Thereby, compared with the case where feedback control is not performed, acceleration / deceleration becomes gentle, and the elevator car 1 is lifted and lowered smoothly.

  In addition, as shown in FIG. 1, the elevator car stopping device of the present embodiment is provided with a front plate 94 facing the platform 95 of the door pocket portion 93 so as to be freely opened and closed. That is, the door pocket portion 93 serves as an inspection port that communicates with the hoistway 3 on the back of the door pocket portion 93, and the operator can enter the work pit 32.

  Note that the movement restricting device 8 of the present embodiment has a structure in which the support portion 81 rotates in the vertical direction. However, in the present invention, the support portion 81 may be slidably slidable. .

DESCRIPTION OF SYMBOLS 1 Elevator car 11 Platform 14 Car part 17 Inner door 2 Control box 21 Control part 3 Hoistway 32 Work pit 33 Guide rail 4 Drive device 5 Hydraulic jack 6 Hydraulic unit 61 Tank 62 Pump 63 Motor 64 Delivery path 65 Shut-off valve 66 Casing 7 Stopping device 71 Stopper means 73 Control stopping means 8 Movement restricting device 81 Support portion 82 Contact sensor 83 Fixing means 92 Outer door 95 Platform

Claims (2)

Elevator car,
A hoistway which accommodates this elevator car inside and is movable in the vertical direction;
A hydraulic jack that drives the elevator car up and down in the hoistway;
A tank for storing oil to be supplied to the hydraulic jack;
A pump for supplying oil stored in the tank to the hydraulic jack;
A motor for operating this pump;
A control unit for controlling the driving of the motor;
Manual operation switching means for switching the drive of the motor by the control unit from automatic control to manual control;
A work pit provided at the lower end of the hoistway;
In order to ensure the working height of the working pit, a stop device for stopping the elevator car at least a predetermined dimension above the bottom of the working pit,
The stopping device is
A movement restriction state that is provided above the bottom of the working pit by a predetermined dimension, protrudes on the movement locus of the elevator car and prevents the elevator car from passing, and a support portion on the movement locus of the elevator car. Stopper means that switches to any state of the movement permission state that does not project,
Also stops any control of the automatic control and manual control by the control unit to the stopper means in the movement restriction state, and a control stop unit that Ru is stopped through the gap between the elevator car and the supporting portion An elevator car stopping device characterized by comprising: The stopper means includes a contact-type sensor that comes into contact with the support portion in a movement-permitted state and is non-contact with the support portion in a movement-restricted state.
The elevator car stop device according to claim 1, wherein the control stop means controls the drive of the motor to stop based on a detection signal from the contact sensor.

Images