Elevator hoisting machine

Abstract

To realize a double braking of a motor efficiently while suppressing increase in scale of a machine-room-less elevator hoisting machine which includes an electric motor incorporated with a brake device.SOLUTION: In an elevator hoisting machine, a reduction gear includes a gear mechanism including two-stage gear trains of a worm gear stage and a helical gear stage inside a gear box. A cylindrical worm serving as an input shaft of the worm gear stage includes an extended rotation shaft extending on the same shaft from both sides in the longitudinal direction and protruding outward from the gear box. A first motor built in a brake device whose output shaft is connected to one end part of the extended rotation shaft is included as a sheave rotation driving electric motor. A second motor built in the brake device whose output shaft is connected to the other end part of the extended rotation shaft is included as a power generator which is driven by following the rotation drive of the first motor through the cylindrical worm and the extended rotation shaft. The brake device of the first motor and the brake device of the second motor constitute a double braking mechanism with respect to the first motor.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an elevator hoist that is capable of realizing a double brake for an electric motor while suppressing the size increase for machine room-less applications, and that can also be applied to explosion-proof applications. [Background technology]

[0002] Electrical equipment that is operated in dangerous environments that may cause explosions, such as in pharmaceutical and other chemical factories and plants where flammable gases, steam, or oxygen are present, or in places with ignition sources that can raise these gases or steam to ignition temperatures, is usually equipped with explosion-proof construction. Explosion-proof construction is a fully enclosed structure that allows the container to withstand the pressure of an explosion of explosive gas inside the container and prevents flames from igniting the explosive gas outside, so that it can be used in explosive gas environments.

[0003] Even passenger / freight elevators that are operated in dangerous environments are available with explosion-proof specifications. For example, electrical components other than the machine room, such as the hall operating panel, the operating panel inside the car, and lighting equipment, are explosion-proof, and measures are taken to prevent explosions caused by electrical sparks even in dangerous environments.

[0004] However, because such explosion-proof elevators are based on the premise that the machine room is not a dangerous atmosphere, no explosion-proof measures are taken for the elevator hoist. Also, explosion-proof elevators that prevent the machine room from filling with a dangerous atmosphere by using a fan to increase the internal pressure or by forced ventilation have been considered (see, for example, Patent Document 1).

[0005] On the other hand, so-called "machine room-less elevators" that simplify the elevator facility configuration by installing the hoisting machine and control device inside the hoistway and eliminating the need for a rooftop machine room are widely used as the standard type. Also, hoists are not always installed in environments that are isolated from dangerous atmospheres, such as for use in coal mines. Therefore, elevator hoists that are expected to be operated in such dangerous environments are required to have explosion-proof specifications.

[0006] Currently, a gear-type elevator hoist is used as a traction rope type low-speed elevator that is generally widely used. This elevator hoist is mainly composed of a sheave around which a main rope is wound, with a counterweight hanging on one end of the elevator car and the other end of the counterweight hanging on the other end, an electric motor for rotating the sheave, a reducer for transmitting the rotational motion of the electric motor to the sheave, and a braking mechanism (i.e., a brake device) for braking the motor shaft to stop the elevator car at a specified height (floor). Therefore, in order to make an elevator hoist explosion-proof, the main body of the electric motor, which may generate sparks or overheat, except for the sheave and reducer, which are not electrical parts, must first be housed in an explosion-proof container with strength and rigidity that meets the explosion-proof standard to make it explosion-proof.

[0007] The braking mechanism for the brake device of an electric motor can be mechanical, hydraulic or pneumatic, or electromagnetic, but for elevator motors, the electromagnetic type is used because it is simple in structure and inexpensive. Electromagnetic brakes use electromagnetic force to generate braking force, but the most widely used type is the friction type, which has excellent controllability. Friction brakes use the pressing force of a friction material as the braking force.

[0008] This friction type includes a brake drum type in which a brake drum is fixed coaxially to the motor output shaft between the reducer, a pair of brake shoes are arranged on both the left and right sides of the outer periphery of the drum via brake arms, and the brake shoes are pressed against the outer periphery of the drum by electromagnetic drive to apply braking; and a disc brake type in which a braking operation and release operation are performed by pressing a friction material such as a brake shoe against a circular brake disc fixed coaxially to the motor rotating shaft on the opposite side to the output shaft, using the biasing force of a spring and the suction force of an electromagnetic drive unit that resists this.

[0009] Therefore, in an explosion-proof elevator hoist, an explosion-proof measure is required for a brake device equipped with an electromagnetic drive unit in which such current control is performed.However, in the case of a machine room-less elevator, it is desirable to take explosion-proof measures without increasing the size as much as possible.Therefore, an explosion-proof elevator hoist has been developed as a brake drum type brake device in which the brake drum and brake arm themselves do not belong to the category of electrical components, and only the electromagnetic drive unit that drives the brake arm is enclosed in a casing that meets explosion-proof standards (see Patent Document 2).

[0010] In addition, for the disc brake type, for example, a short-stroke solenoid is arranged around the motor shaft opposite the output side, and the movable iron core of the solenoid applies a braking force directly to the brake disc via a braking spring. When current is applied to the coil, an attractive force is generated in the fixed iron core, which moves the movable iron core away from the brake disc against the biasing force of the braking spring, releasing the brake. A compact design has also been considered in which the brake-equipped motor is integrated into an explosion-proof container that covers the motor body. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] Japanese Patent Application Publication No. 59-43780 [Patent Document 2] JP 2013-2549 A Summary of the Invention [Problem to be solved by the invention]

[0012] From the viewpoint of safety, it is desirable for the motor brake device of an elevator hoisting machine to have two braking mechanisms, i.e., a so-called double brake structure. However, in explosion-proof elevator hoisting machines, especially machine-room-less types for which compactness is important, it is not easy to increase the number of braking mechanisms for the electric motor to achieve a double brake structure while preventing the machine from becoming too large.

[0013] For example, in the case of the brake drum type, if another brake drum is added, the braking mechanism of the brake drum type itself is relatively large and requires explosion-proofing measures for itself, so that the size of the hoisting machine will inevitably increase, which is not practical for a machine room-less type.

[0014] Also, in the case of a motor-integrated disc brake type, where the braking mechanism itself can be made relatively compact, it is possible to consider installing it inside the same explosion-proof container. However, other measures such as keeping the distance between the two electromagnetic drive units so that their magnetic fields do not affect each other are important, so it is still difficult to achieve a double brake while keeping the size down.

[0015] In view of the above problems, an object of the present invention is to provide an elevator hoisting machine for machine room-less use that has an electric motor with a built-in brake device, and that makes it possible to efficiently achieve double braking of the motor while preventing the machine from becoming too large. [Means for solving the problem]

[0016] In order to achieve the above object, the elevator hoisting machine according to the invention of claim 1 is an elevator hoisting machine including a sheave around which a main rope is wound, the main rope having a lifting car and a counterweight suspended at both ends thereof, an electric motor for driving and rotating the sheave, and a reducer for reducing the rotation of the electric motor to a predetermined rotation speed and outputting the reduced rotation speed to the sheave, The reducer includes a gear mechanism having a two-stage gear train in which a worm gear stage and a helical gear stage are combined in a gear box, the worm gear stage being composed of a cylindrical worm as an input shaft and a worm wheel meshing with the cylindrical worm, the helical gear stage being composed of a helical pinion coaxially connected to the worm wheel via an intermediate shaft, and a helical gear meshing with the helical pinion and having a rotation center axis connected to the rotation center axis of the sheave as an output shaft, The cylindrical worm includes an extension shaft that extends coaxially from both sides in the longitudinal direction thereof, protrudes outward from the gear box, and rotates integrally with the cylindrical worm; The gear box has a pair of upper wall portions in an upper opposing region, the pair of upper wall portions rotatably supporting the cylindrical worm in a horizontal direction and allowing extension rotation shafts on both sides of the cylindrical worm to rotatably protrude outward, a first motor as the electric motor for rotationally driving the sheave, the first motor having an output shaft connected to one end of the extended rotating shaft and a brake device disposed integrally with the motor body within the same container; and a second motor as a generator which drives in response to the rotational drive of the first motor via the cylindrical worm and the extended rotating shaft, the second motor having an output shaft connected to the other end of the extended rotating shaft and a brake device disposed integrally with the motor body within the same container, The brake device for the first motor and the brake device for the second motor constitute a double brake mechanism for the first motor.

[0017] The elevator hoisting machine of the invention of claim 2 is the elevator hoisting machine of claim 1, characterized in that the brake device of the first motor and the brake device of the second motor are electromagnetic disc brake type braking mechanisms.

[0018] The elevator hoist of the invention of claim 3 is an elevator hoist of the invention as defined in claim 1 or 2, wherein the gearbox is integrally provided with a fringe structure portion on both sides of the pair of upper wall portions, the fringe structure portion being connectable to fringe portions provided at each casing end of the first motor and the second motor.

[0019] The elevator hoisting machine of the invention of claim 4 is an elevator hoisting machine described in any one of claims 1 to 3, characterized in that the first motor and the second motor are explosion-proof motors with brakes, in which a motor body and a brake device are housed in an explosion-proof container that complies with explosion-proof standards.

[0020] The elevator hoisting machine of the invention of claim 5 is an elevator hoisting machine described in any one of claims 1 to 4, further comprising a regenerative circuit that recovers the power generated by the second motor as regenerative power. Effect of the Invention

[0021] The present invention provides a traction rope type gear elevator hoist, in which a gear mechanism is formed of a two-stage gear train combining a worm gear stage and a helical gear stage, and the worm gear stage including the input shaft is kept small with a relatively small reduction ratio, so that the capacity required for the electric motor as the drive source is not large, and a brake device is housed integrally in the same container to form a compact brake-equipped motor that can be assembled as an electric motor for driving a sheave. Moreover, the extended rotating shafts that extend from both sides of the cylindrical worm of the worm gear stage as the input shaft in the longitudinal direction and rotate integrally with the cylindrical worm are provided protruding outward from a pair of upper walls of the gear box, so that the output shaft of the compact brake-equipped motor can be coaxially connected to the end of each extended rotating shaft. This allows a pair of motors, a first motor as a drive source and a second motor as a generator, to be simply installed coaxially and linearly on the left and right sides of the reducer without the need for troublesome centering work, etc., and a double brake mechanism can be formed by the brake device of the first motor and the brake device of the second motor, thereby achieving the effect of realizing a compact elevator hoist with a double brake suitable for machine room-less elevators and even explosion-proof use. [Brief description of the drawings]

[0022] [Figure 1] 1A and 1B are schematic configuration diagrams of an elevator hoisting machine according to one embodiment of the present invention, in which (a) is a schematic front view, and (b) is a partial explanatory diagram showing the connection structure between first and second motors and a gear mechanism. [Diagram 2] FIG. 2 is a cross-sectional view taken along line AA in FIG. 1(a) showing a gear configuration in a gear box of the elevator hoisting machine of FIG. [Diagram 3] FIG. 2 is a schematic rear view mainly showing a gear box of the elevator hoisting machine of FIG. 1. [Figure 4] FIG. 2 is a schematic diagram illustrating the overall configuration of an elevator system equipped with the elevator hoisting machine of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] The present invention provides a traction rope type gear type elevator hoist including a sheave around which a main rope is wound, suspending an elevator car and a counterweight at both ends, an electric motor for rotating and driving the sheave, and a reducer for reducing the rotation of the electric motor to a predetermined rotation speed and outputting the reduced rotation speed to the sheave, wherein the reducer includes a gear mechanism consisting of a two-stage gear train in which a worm gear stage and a helical gear stage are combined in a gear box, the worm gear stage is composed of a cylindrical worm as an input shaft and a worm wheel that meshes with the cylindrical worm, the helical gear stage is composed of a helical pinion that is coaxially connected to the worm wheel via an intermediate shaft, and a helical gear that meshes with the helical pinion and has its rotation center axis connected to the rotation center axis of the sheave as an output shaft, and the cylindrical worm is coaxially connected to the worm wheel via an intermediate shaft, and the helical gear is coaxially connected to the worm wheel via an intermediate shaft, and the helical gear is coaxially connected to the helical pinion as an output shaft, and the cylindrical worm is coaxially connected to the worm wheel via an intermediate shaft, and the helical gear is coaxially connected to the sheave via an intermediate shaft, and the helical pinion ... The gearbox has a pair of upper wall portions in an upper opposing area that rotatably support the cylindrical worm horizontally while allowing the extended rotating shafts on both sides of the cylindrical worm to rotatably protrude outward. A first motor is an electric motor for driving the rotation of the sheave, and an output shaft is connected to one end of the extended rotating shaft, and a brake device is arranged integrally with the motor body within the same container. A second motor is a generator that drives in response to the rotation of the first motor via the cylindrical worm and the extended rotating shaft, and the brake device of the first motor and the brake device of the second motor form a double brake mechanism for the first motor.

[0024] According to the above configuration, in the present invention, the gear mechanism of the reducer is configured with a two-stage gear train combining a worm gear stage and a helical gear stage, so that the first stage worm gear can have a relatively small reduction ratio, and the portion of the entire gear mechanism that is handled by the worm gear stage including the input shaft is kept small. In addition, since it is combined with a helical gear stage that has a parallel axis and originally has a very high motion transmission efficiency, the overall transmission efficiency is improved compared to the conventional case where it is configured with only one worm gear stage. At the same time, the adverse effect of the decrease in efficiency during driving due to the worm gear stage is kept small, so the capacity required for the electric motor as the driving source is not as large as in the past, and the installation of a large motor can be avoided. Therefore, a motor with a brake that is compactly configured by integrating a brake device into the same container can be incorporated as an electric motor for driving the sheave, and a hoist suitable for a machine room-less elevator that requires compactness can be constructed.

[0025] In the present invention, the cylindrical worm of the worm gear stage, which serves as the input shaft, has extended rotating shafts extending from both longitudinal sides thereof and rotating integrally with the cylindrical worm, each of which protrudes outward from a pair of upper walls in the upper region of the gearbox, so that the output shaft of the above-mentioned compact motor with brake can be coaxially connected to the end of the extended rotating shaft, and a pair of first and second motors can be easily installed coaxially and linearly on the left and right of the reducer without the need for troublesome centering work, etc. Also, if the first and second motors are of the same type, this simplifies the configuration and is desirable.

[0026] These motors can be configured such that one of the first motors is an electric motor for driving a sheave, and the other, the second motor, is a generator that rotates following the first motor. This allows the brake device built into the first motor and the brake device built into the second motor to function well as two braking mechanisms arranged at positions separated from each other with respect to the rotating shaft of the first motor without being influenced by each other's magnetic fields. Therefore, according to the present invention, a double brake can be realized in a hoist for a machine room-less elevator.

[0027] Moreover, by making the first motor and the second motor explosion-proof motors with brakes, in which the motor body and the brake device are housed in explosion-proof containers that comply with explosion-proof standards, the present invention can be used as an explosion-proof elevator hoist. In other words, this makes it possible to realize an explosion-proof elevator hoist with a double brake. When using an explosion-proof elevator, it is preferable that the gear box also has airtightness and robustness that comply with explosion-proof standards.

[0028] In addition, in the present invention, when the first motor is driven to rotate, the second motor is driven to rotate as a generator to generate electricity, and this power can be used to save energy. Therefore, a control device that controls the drive of the first motor to control the operation of the elevator car may be provided with a regenerative circuit that recovers and uses the power generated by the second motor as regenerative power. This regenerative circuit can store the regenerative power or switch the power supply circuit to supply power during a power outage, so that the regenerative power can be used as emergency power. Of course, it can also be used as a power source for the first motor as a self-regenerative circuit. In addition, the rotation drive and power generation of the first motor and the second motor may be periodically exchanged. This makes the lifespan of each motor approximately the same, and prevents problems such as failure of only one of the motors.

[0029] In addition, the brake devices built into the first and second motors in the present invention are preferably electromagnetic brakes, which have a simple structure and are inexpensive, and more compact electromagnetic disk brakes are practical and optimal. Among them, a type in which a braking force is applied to a brake disk by the inertia of a braking spring when not energized (when no power is supplied), and the braking force is released when energized (when energized), is desirable, as it provides a simple configuration for the electromagnetic drive unit.

[0030] In addition, when the first and second motors are actually assembled into the hoist, the casings of the motors are attached to both the left and right sides of the gearbox with the output shafts connected to the ends of the extended rotating shafts protruding outward from the pair of upper walls of the gearbox. Therefore, it is preferable that the gearbox is provided integrally with fringe structures on both outside sides of the pair of upper walls that can be connected to the fringes provided on the casing ends of the first motor and the second motor. EXAMPLES

[0031] As an embodiment of the present invention, an elevator hoisting machine for a machine roomless use equipped with a pair of motors with explosion-proof brakes is shown in the schematic configuration diagrams of Figures 1 to 4. Figure 1(a) is a schematic front view of the elevator hoisting machine, and (b) is a partial explanatory diagram showing the connection structure between the first and second motors and the gear mechanism. Figure 2 is a cross-sectional view taken along line AA of Figure 1(a) showing the gear configuration inside the gear box of the elevator hoisting machine. Figure 3 is a rear view showing mainly the gear box of the elevator hoisting machine. Figure 4 is a schematic configuration diagram of the entire elevator system equipped with the elevator hoisting machine according to this embodiment.

[0032] The elevator hoist 1 according to this embodiment is a traction rope type for a machine room-less elevator that is installed above an elevator shaft, and an explosion-proof specification equipped with an explosion-proof motor is illustrated.

[0033] This elevator hoisting machine 1 is composed of a sheave 2, a first motor 30 with a brake as an electric motor for driving and rotating the sheave 2, a reduction gear 4 that reduces the rotation of the first motor 30 to a predetermined rotational speed and outputs it to the sheave 2, and a second motor 40 with a brake as a generator arranged symmetrically to the first motor 30 with the reduction gear 4 in between.

[0034] A main rope 120 is wound around the sheave 2, with the elevator car 100 suspended at one end and a counterweight 110 suspended at the other end. The rotational force of the first motor 30 is transmitted to the sheave 2 via the reducer 4, and as the sheave 2 rotates, the main rope 120 moves, causing the elevator car 100 to travel vertically within the elevator hoistway.

[0035] The first motor 30 has its rotation drive of the motor body and the electromagnetic brake device controlled by the control device 200 via a power supply circuit 210, and its rotation speed controlled by an inverter circuit (not shown). Thus, the output control controls the rotation drive of the sheave 2, and controls the acceleration / deceleration and stopping of the elevator car 100, thereby moving to the destination floor, stopping when it reaches the landing position, and maintaining the elevator car in a stationary state.

[0036] The gear mechanism of the reducer 4 is composed of a two-stage gear train consisting of a worm gear stage 10 and a helical gear stage 15. The worm gear stage 10 is made up of a cylindrical worm 11 and a worm wheel 13 meshing therewith, and the helical gear stage 15 is made up of a helical pinion 16 and a helical gear 17 meshing therewith. The helical pinion 16 is arranged coaxially with the worm wheel 13 via an intermediate shaft 14, and an output shaft 18 of the helical gear 17 is connected coaxially to the sheave shaft 6.

[0037] These gear mechanisms are housed within a gear box 20, with the cylindrical worm 11 rotatably supported via bearings in through holes (22x, 22y) formed at opposing positions in a pair of upper wall portions (21x, 21y) extending into the upper region of the gear box 20, and a pair of first and second extended rotation shafts 12x and 12y extending coaxially from both longitudinal sides of the cylindrical worm 11 and rotating integrally with the cylindrical worm 11 protruding outward from both through holes (22x, 22y), respectively.

[0038] One end of the first extended rotating shaft 12x serves as an input shaft and is connected to an output shaft 32 of a first motor 30 via a coupling joint (Cx, 31). An end of the other second extended rotating shaft 12y is connected to an output shaft 42 of a second motor 40 serving as a generator via a coupling joint (Cy, 41). Therefore, the first motor 30 and the second motor 40 are both linearly arranged coaxially with the cylindrical worm 11.

[0039] The gearbox 20 is an integrally molded type that does not have a dividing surface in the central region and accommodates most of the gear mechanism inside except for the ends of the first extended rotating shaft 12x and the second extended rotating shaft 12y that protrude outward, and in this embodiment, it has airtightness and robustness that meets the explosion-proof standard. For example, the gearbox 20 is made of cast iron, and is molded from FCD450 (ferritic-pearlitic spheroidal graphite cast iron). In the wall area on the back side of the gearbox 20 facing the sheave 2 side, an opening 23 larger than the outer diameter of the helical gear stage 15, which is the largest gear stage, is formed, and most of the components of the gear mechanism except for the cylindrical worm 11 can be inserted and removed through the opening 23. Therefore, parts can be easily inserted and installed when assembling the reducer 4, and parts replacement work after installation as the elevator hoisting machine 1 can be easily performed through the opening 23.

[0040] After the reduction gear 4 is assembled, a sleeve member 26 that fits into the opening 23 is fitted therein. A bearing holder 24x that supports one end of the intermediate shaft 14 and a bearing holder 25y that supports one end of the output shaft 18 are formed in the sheave side wall region of the gear box 20, and the sleeve member 26 is formed with a bearing holder 24y that supports the other end of the intermediate shaft 14 in a wall region facing the bearing holder 24x when fitted into the opening 23, and a bearing holder 25y that supports the other end of the output shaft 18 in a wall region facing the bearing holder 25x. The pair of bearing retaining portions (24x, 24y) of the intermediate shaft 14 and the pair of bearing retaining portions (25x, 25y) of the output shaft 18 are formed as through holes in the gear box 20, and the openings exposed to the outside of each through-hole-shaped bearing retaining portion are covered with covers (27x, 27y, 28x, 28y).

[0041] In this embodiment, fringe structures (29x, 29y) are integrally provided around the through holes (22x, 22y) from which the extended rotating shafts (12x, 12y) protrude on both sides of the pair of upper wall portions (21x, 21y) of the gearbox 20. These fringe structures (29x, 29y) are connected to fringe portions (30F, 40F) provided on the output shaft side casing ends of the first motor 30 and the second motor 40, so that the reducer 4 and the first and second motors (30, 40) are stably connected in a connected state between each output shaft (32, 42) and both sides of the cylindrical worm 11, and the elevator hoisting machine 1 is assembled.

[0042] The second motor 40, which is connected to the first motor 30 in a symmetrical position with respect to the cylindrical worm 11, is a generator, and the rotational force for the first motor 30 is transmitted via the second extended rotating shaft 12y, with its output shaft 42 essentially serving as an input shaft, and the second motor 40 is driven to rotate following the first motor 30, generating electricity. The first motor 30 and the second motor 40 are motors with brakes of the same type, and each has a brake device (35, 45) built in a casing made of the same explosion-proof container integral with the motor body. The first brake device 35 of the first motor 30 and the second brake device 45 of the second motor 40 form a double brake mechanism for the first motor.

[0043] In this embodiment, the first motor 30 and the second motor 40 are equipped with a disk brake type electromagnetic braking mechanism that is compactly constructed around the motor rotating shaft (33, 43) on the opposite side to the output shaft (32, 42) as the first and second brake devices (35, 45). In particular, the drive that is pressed against the brake disk when braking and moves away when releasing is directly performed by the movable iron core of the solenoid, making it more compact and preventing the motor from becoming larger. Specifically, a disk brake type electromagnetic brake device having the following configuration is provided. Here, the first brake device 35 and the second brake device 45 function as a double brake device in synchronization with each other.

[0044] That is, while the first motor 30 is stopped, in the first and second brake devices (35, 45), the end face side of the movable iron core (39, 49) of the solenoid connected to the braking spring (37, 47) is pressed against the brake disc (36, 46) fixed to the motor rotating shaft (33, 43) and the hub and rotating integrally therewith by the biasing force of the braking spring (37, 47) in a non-excited state of the solenoid, via a friction material such as a brake shoe or a lining L, thereby applying a braking force. On the other hand, while the first motor 30 is operating, the movable iron core (39, 49) is attracted to the fixed iron core (38, 48) against the braking spring (37, 47) by an attractive force generated by energizing and exciting the electromagnetic coil (34, 44) around the fixed iron core (38, 48), and the brake disc (36, 46) is released from the braked state. Therefore, when the power supply to the outer motor is cut off and the power supply to the solenoid is stopped while the first motor 30 is operating, the suction force disappears, and the movable iron core (39, 49) moves due to the biasing force of the braking spring (37, 47) and is pressed against the brake disc (36, 46), braking pressure is applied, and the rotation of the first motor 30 comes to a complete halt.

[0045] In this embodiment, the control of the power supply to the first motor 30 and the first and second brake devices (35, 45) and the inverter control of the motor rotation speed are performed via a power supply circuit 210 of the control device 200. Meanwhile, while the first motor 30 is rotating, the second motor 40 is rotated following the first motor 30 to generate power. This generated power is collected by a regeneration circuit 220 as regenerative power, can be stored, and can be used as desired.

[0046] For example, energy can be saved by using it as a power source for the interior lighting and control panel of the elevator car 100. In addition, the regenerative circuit 220 can use the regenerative power as an emergency power source by configuring it to switch the power circuit 210 during a power outage. Furthermore, it may be used as a power source for the first motor 30 by making it a self-regenerative circuit.

[0047] As described above, the elevator hoist 1 according to this embodiment can realize double braking for machine room-less and explosion-proof use with a simple configuration while suppressing the size of the entire device configuration, and can also contribute to energy savings in elevator operation. [Explanation of symbols]

[0048] 1: Elevator hoist 2: Sheaves 4: Reducer 6: Sheave shaft 10: Worm gear stage 11: Cylindrical worm 12x, 12y: Extended rotation axis 13: Worm wheel 14: Intermediate shaft 15: Helical gear stage 16: Helical pinion 17:Helical gear 18: Output shaft 20: Gear box 21x, 21y: a pair of upper walls 22x,22y: Through hole 23:Aperture 24x, 24y: Bearing holder for intermediate shaft 25x, 25y: Output shaft bearing holder 26: Sleeve material 27x, 27y, 28x, 28y: Cover 29x, 29y: Fringe structure Cx, Cy: Worm side coupling joint 30: First motor 40: Second motor (generator) 30F, 40F: Fringe section 31, 41: Motor side coupling joint 32, 42: Output shaft (motor) 33, 43: Motor shaft 34, 44: Electromagnetic coil 35: First brake device 45: Second brake device 36,46: Brake disc L: Lining 37, 47: Brake spring 38,48: Fixed iron core 39, 49: Movable iron core 100: Lift cage 110: Counterweight 120: Main rope 200: Control device 210: Power supply circuit 220: Regeneration circuit

Claims

1. An elevator hoisting machine comprising: a sheave around which a main rope is wound, the main rope having a lifting car and a counterweight suspended at both ends thereof; an electric motor for driving and rotating the sheave; and a reducer for reducing the rotation of the electric motor to a predetermined rotation speed and outputting the reduced rotation speed to the sheave, The reducer includes a gear mechanism having a two-stage gear train in which a worm gear stage and a helical gear stage are combined in a gear box, the worm gear stage being composed of a cylindrical worm as an input shaft and a worm wheel meshing with the cylindrical worm, the helical gear stage being composed of a helical pinion coaxially connected to the worm wheel via an intermediate shaft, and a helical gear meshing with the helical pinion and having a rotation center axis connected to the rotation center axis of the sheave as an output shaft, The cylindrical worm includes an extension shaft that extends coaxially from both sides in the longitudinal direction thereof, protrudes outward from the gear box, and rotates integrally with the cylindrical worm; The gear box has a pair of upper wall portions in an upper opposing region, the pair of upper wall portions rotatably supporting the cylindrical worm in a horizontal direction and allowing extension rotation shafts on both sides of the cylindrical worm to rotatably protrude outward, a first motor as the electric motor for rotationally driving the sheave, the first motor having an output shaft connected to one end of the extended rotating shaft and a brake device disposed integrally with the motor body within the same container; and a second motor as a generator, the second motor having an output shaft connected to the other end of the extended rotating shaft and a brake device disposed integrally with the motor body within the same container, the second motor being driven in response to the rotational drive of the first motor via the cylindrical worm and the extended rotating shaft, an elevator hoisting machine, characterized in that the brake device for the first motor and the brake device for the second motor form a double brake mechanism for the first motor.

2. 2. The elevator hoisting machine according to claim 1, wherein the brake device for the first motor and the brake device for the second motor are electromagnetic disc brake type braking mechanisms.

3. 3. The elevator hoist according to claim 1, wherein the gearbox is integrally provided with a fringe structure portion on both sides of the pair of upper wall portions, the fringe structure portion being connectable to a fringe portion provided at each casing end of the first motor and the second motor.

4. The elevator hoisting machine according to any one of claims 1 to 3, characterized in that the first motor and the second motor are explosion-proof motors with brakes, in which a motor body and a brake device are housed in an explosion-proof container that complies with explosion-proof standards.

5. The elevator hoisting machine according to any one of claims 1 to 4, further comprising a regenerative circuit that recovers electric power generated by the second motor as regenerative electric power.

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