JP2012046348A - Manual lowering mechanism of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator which can descend to a safe place even in a state where the elevator can not be driven due to power failure and malfunction of a drive system.SOLUTION: The elevator has a manual lowering mechanism with which a braking function of a drive motor is released and the elevator body is freely descended with its deadweight while being braked with a drum brake, so that a person in the elevator body can come down to a safe place even in the state where the elevator stops due to the power failure and the malfunction of the drive system. Moreover, in case the elevator descends at an excessive lowering speed with the overload applied while manually lowering, a torque detector for detecting the excessive lowering speed is mounted on the elevator body, so that a brake pinion separately attached to a rack is stopped by a pinion-stop mechanism when the torque detector detects the excessive lowering speed, thereby stopping the descending of the elevating body.

Description

  The present invention relates to a manual lowering mechanism for an elevator, and more particularly to an elevator capable of manually lowering an elevator body during a power failure.

  For example, with regard to a wind turbine or observation tower that rises high above the sky, such as a tower that supports a wind turbine of wind power generation at the upper end or a column that supports an observation deck at the upper end, the tower or column that supports them is above the ground. Standing high.

  The inside of these towers and pillars are hollow, and this hollow part has a built-in lifting device along the inner wall of the tower. The elevator is used to ascend to a wind turbine section such as a wind turbine at the upper end, and after the work is finished, the elevator is lowered and returned.

  As such an elevating device, for example, as described in Patent Document 1, an elevating body on which a worker can ride in a hollow cylindrical body such as a tower is held up and down freely, and along the inner wall portion of the hollow cylindrical body. Racks are installed on the top and bottom, pinions mounted on the lifting body are engaged with the racks, and the pinion is rotated by power, so that the lifting body can be moved up and down along the racks to perform lifting work. .

  In particular, in such an elevating device, an elevating body is supported on a rail so as to be movable up and down, an electric drive motor is disposed on the elevating body, and a drum brake as a braking mechanism is linked to the drive motor. It has been. In the normal lifting operation, the drive motor is driven to operate the pinion and perform the lifting operation along the rack. And when stopping at the time of normal driving | operation, by stopping operation of the electric power supply to a drive motor, a drive motor is stopped and a raising / lowering body is stopped in a predetermined position.

  Such a drum brake has a brake shoe attached to a brake shaft linked to a drive motor, while a brake drum is attached to the casing of the elevator body, and the diameter of the brake shoe is increased by the action of centrifugal force generated by the rotation of the brake shaft, The outer peripheral surface of the brake shoe is in contact with the inner peripheral surface of the brake drum, and the rotation of the brake shaft is held constant by the frictional force.

JP 2000-310261 A

  However, in the event of a power outage, the supply of power for raising and lowering is interrupted, and therefore the elevator cannot be driven and cannot be lowered, causing a problem that humans in the elevator are trapped in the elevator. .

  In addition, during normal lowering operation, if a load greater than or equal to a predetermined value is applied to the lifting body, a rotational force greater than the lowering driving rotational force of the drive motor is applied to the pinion, and the lifting body may be lowered at a speed higher than the predetermined value. Has occurred.

  This invention was made in order to solve the said problem, and it aims at providing the elevator which can descend | fall to a safe place, even if the elevator cannot drive due to a power failure or a failure of the drive system. .

  Accordingly, the invention according to claim 1 is configured such that a rail is laid vertically in a hollow portion of a hollow cylindrical body that rises on the ground surface, and an elevator body on which an operator can get on the rail is supported so as to be able to get on and off. It is engaged with a rack provided on the rail, and a pinion is interlocked and connected to the output shaft of the drive motor in the elevator of the elevator body, and the elevator body is configured to move up and down within the hollow cylindrical body by driving the drive motor when energized. When the drive motor is de-energized, it is configured to stop the rotation of the pinion by a stop mechanism built in the drive motor and stop the operation of the elevator. At the time of a ready operation stop, the drive motor stop mechanism is released by the manual lowering mechanism, so that the pinion rotates in the idle state by the dead weight of the lifting body to perform the lowering operation. In addition, torque detection means is attached to the pinion shaft, and when the excessive descending speed of the lifting body due to the rotation of the pinion or more is detected, the brake pinion separately attached to the rack is stopped by the pinion stop mechanism. This is a manual lowering mechanism for an elevator characterized by stopping the lowering of the elevator.

  According to a second aspect of the present invention, the pinion stop mechanism includes a non-excitation actuating brake, and the non-excitation actuating brake detects an excessive descending speed of the lifting body due to the torque detecting means rotating more than a predetermined amount of the pinion. Then, the manual lowering mechanism of the elevator according to claim 1, wherein the drive shaft of the brake pinion is braked.

  According to a third aspect of the present invention, the lifting body includes a boarding portion that allows one worker to board in a standing state. The manual lowering of the lifting machine according to the first or second aspect Mechanism.

  The present invention is implemented in the form as described above, and has the following effects.

  (1) In the present invention, during normal operation, the elevator can transmit the rotational force from the drive motor to the drive pinion, and can freely move the elevator up and down along the rail provided with the rack. When power is not supplied, the drive motor brake function is activated and the elevator is stopped.By releasing the brake function with the manual lowering mechanism, the pinion is made free, and the elevator body is Descent with its own weight. Then, while the drum brake interlocked with the pinion is operated by receiving the rotation of the pinion, the lifting body descends at a constant speed by the braking of the drum brake.

  In this way, even if the lifting body is stopped due to a power failure or a drive system failure, the brake function of the drive motor is canceled by the manual lowering mechanism, and the lifting body is moved to its own weight while braking with the drum brake. The person who is on the lifting body can get down to a safe place.

  In addition, there is a danger of rapid descent when overload is applied during manual descent such as during a power failure. Therefore, a torque detecting means for rapidly detecting the excessive descending speed of the lifting body is provided, and when the torque detecting means detects the excessive descending speed, the brake pinion separately attached to the rack is stopped by the pinion stop mechanism to By stopping the descent, the safety of the lifting body is increased.

  (2) In the present invention, when the torque detecting means detects the excessive descending speed of the lifting body due to the rotation exceeding a certain level, the brake pinion linked to the non-excitation actuating brake is braked. When the vehicle descends at an excessive descending speed, the brake pinion brakes to stop the ascending / descending of the elevator.

  (3) In the present invention, since the lifting body can be boarded by a worker alone, the lifting body on which the worker can board can be made compact, and the space in the tower where the lifting body is installed is effective. Can be used.

It is a left view which shows the whole structure which has arrange | positioned the manual lowering mechanism of the elevator in this embodiment. It is a front view which shows the whole structure which has arrange | positioned the manual lowering mechanism of the elevator in this embodiment. It is a right view which shows the whole structure which has arrange | positioned the manual lowering mechanism of the elevator in this embodiment. It is a top view which shows the whole structure which has arrange | positioned the manual lowering mechanism of the elevator in this embodiment. It is a perspective view which shows the whole structure of the elevator in this embodiment. It is a front view which shows the structure of the drive part of the elevator in this embodiment. It is a top view which shows the structure of the drive part of the elevator in this embodiment. It is a left view which shows the structure of the pinion stop mechanism of the elevator in this embodiment. It is a right view which shows the structure of the pinion stop mechanism of the elevator in this embodiment.

  Embodiments of the present invention will be described below with reference to the drawings.

  The elevator 11 according to the present invention is, for example, installed in a hollow portion of a wind turbine tower of a hollow cylindrical body that rises on the ground surface. The elevator 11 extends an elevator support 12 (shown in FIG. 4) in a vertical direction in a hollow cylindrical column 90, and installs a rail 13 in the vertical direction in the elevator support 12. A lifting body 14 is disposed along the lift.

  As shown in FIG. 4, the elevator support 12 is attached to the inner peripheral surface 91 of the tower 90 via a support attachment member 93, and is extended in the vertical direction along the inner peripheral surface 91. It is installed. The elevator support 12 is configured in a frame shape with the left and right extension pieces 16 and side frames 29a and 29b extended from the both ends of the left and right extension pieces 16 to the left and right sides of the elevation body 14 in plan view. is doing. A plurality of the left and right extending pieces 16 and the side frames 29a and 29b are arranged at predetermined intervals in the vertical direction like a ladder. 92 is a flange surface of the tower 90 connection part.

  And the left-right extension piece 16 is extended and arrange | positioned to the up-down direction, The rail 13 is attached using the left-right extension piece 16. FIG. The rail 13 forms a rack 15 that extends along the side surface of the main body. The elevating body 14 can be raised and lowered along the rail 13 configured in this manner.

  As shown in FIGS. 1 and 2, the elevating body 14 is provided with a riding portion 17 at the upper portion and a driving portion 18 at the lower portion.

  In the boarding part 17, as shown in FIG. 1, it is possible to board with only one worker standing. The boarding part 17 is composed of a floor part 19 on which an operator stands and a fixed frame around the worker P. The fixed frame 20 includes a fixed frame 94 disposed in front of the worker, a support frame 21 that supports the back portion of the worker, an upper frame 22 disposed on the upper portion of the elevating body 14, and a left side of the worker. A supporting side frame 23 is disposed. As shown in FIG. 5, a step body 95 is arranged on the side outer peripheral surface of the housing 32 so that the worker P can get on. Further, the side frame 23 is not disposed on the right side of the worker P, and the worker P can board from the right side.

  When the occupied area in the hollow portion of the tower 90 is small, the single-passage elevator 11 is mounted with one worker P standing, so that the elevator 14 can be made compact, and the tower 90 The space in the hollow portion can be effectively used.

  As shown in FIG. 2, the fixed frame 20 is configured in a substantially rectangular shape by a pair of left and right vertical frame pieces 24 a and 24 b and a plurality of horizontal frame pieces 25 horizontally mounted on the vertical frame pieces 24 a and 24 b. Handles 26 and 26 are disposed in the middle of the pair of left and right vertical frame pieces 24a and 24b. The handles 26 and 26 are gripped so that the operator P does not fall from the lifting body 14.

  Further, as shown in FIG. 2, an elevating switch 27 is disposed above the right vertical frame piece 24 b of the fixed frame 20. The operator P can raise the lifting body 14 when the switch piece of the lifting switch 27 is pushed upward, and can lower the lifting body 14 when the switch piece is pushed downward.

  Further, as shown in FIGS. 2 and 3, a brake release lever 71 of the manual lowering mechanism 28 is disposed below the right vertical frame piece 24 b of the fixed frame 20. The manual lowering mechanism 28 will be described in detail later.

  Further, as shown in FIG. 4, the power supply rail 30 is extended in the vertical direction on a plurality of side frames 29 a arranged at a predetermined interval in the vertical direction. The power feeding rail 30 is engaged with a power feeding portion 31 of the lifting body 14 so that the lifting body 14 can be lifted and lowered by being fed from the power feeding rail 30 to the power feeding portion 31.

  Further, as shown in FIG. 2, an auxiliary traveling wheel 84 is disposed on the upper portion of the riding section 17 via a wheel support 83 fixed to the upper frame 22 that rotates along the rail 13. Yes.

  Next, the driving unit 18 is disposed in a box-shaped housing 32 (shown in FIG. 4) below the riding unit 17.

  As shown in FIGS. 6 to 7, the drive unit 18 is provided with a drive motor 33 as a drive motor for driving the elevating body 14 to move up and down at the lower part of the housing 32, and at the upper part of the drive motor 33. A braking mechanism 34 for lowering the elevating body 14 at a constant speed is provided. In addition, a pinion stop mechanism 60 is disposed above the braking mechanism 34.

  As shown in FIG. 1, the drive unit 18 is provided with a travel upper limiter 85 so that the elevating body 14 does not rise further upward, and the elevating body 14 does not fall further downward. As described above, a traveling lower limiter 86 is provided.

  The drive motor 33 is rotatably attached to a drive pinion 37 via a pinion drive shaft 36, and the drive pinion 37 is engaged with the rack 15. In addition to the drive pinion 37, a brake pinion 38 meshes with the rack 15. As shown in FIG. 9, the drive pinion 37 and the brake pinion 38 have a recess 39 at the center of the outer peripheral end thereof. An uneven portion 40 that engages with the uneven portion of the rack 15 is formed at the outer peripheral end of the concave portion. The elevating body 14 travels along the rack 15 by rotating the drive pinion 37 and the brake pinion 38 on the rack 15.

  The drive motor 33 has a stop mechanism (not shown) that holds the pinion drive shaft 36 of the drive motor 33 and stops the drive motor 33 when power supply from the power source to the drive motor 33 is stopped. Built in.

  That is, the drive motor 33 is a general spring-closed electromagnetic motor. When a voltage is applied to the coil, the armature restrained by the spring is sucked, and the spring is pushed to form a gap between the armature and the disk plate. Thus, a structure for releasing the braking force is provided. Further, when the voltage is not supplied to the coil, the biasing of the spring is released, the armature is pressed against the disk plate, and a braking force is applied.

  During normal operation, the lifting body 14 can be stopped by stopping the power supply to the drive motor 33. Further, when a power failure occurs, the power supply to the drive motor 33 is cut off, and the urging force of the spring in the drive motor 33 is released, so that the elevating body 14 can be stopped.

  The drive motor 33 protrudes the input shaft 41 upward from the upper end portion thereof, and a drum brake 42 is interlocked and connected to the input shaft 41. The input shaft 41 is linked to the pinion drive shaft 36 in the drive motor 33. Therefore, the input shaft 41 is also configured to rotate with the rotation of the pinion drive shaft 36.

  Next, as shown in FIG. 6, a drum brake 42 as a braking mechanism 34 is disposed on the upper end side of the input shaft 41. As shown in FIG. 6, the drum brake 42 includes a substantially cylindrical brake drum 43 and a brake shoe 44 housed in the brake drum 43 and interlocked with the input shaft 41 of the drive motor 33. It is configured. In FIG. 6, 45 is a bearing, 46 is a bearing support, and 47 is a shaft end cover mounting bolt.

  As shown in FIG. 6, the brake shoe 44 has eight shoe supports 49 projecting radially on the outer peripheral surface of a boss 48 provided continuously to the input shaft 41 of the drive motor 33, and the tip of each shoe support 49. A shoe 50 having an arcuate cross section is connected to the section.

  As shown in FIG. 6, in the drum brake 42, the shoe support 49 of the brake shoe 44 is extended by the action of centrifugal force as the input shaft 41 of the drive motor 33 rotates, so that the outer peripheral surface of the shoe 50 is extended. A pinion drive that spreads outward, the outer peripheral surface of the shoe 50 abuts on the inner peripheral surface of the brake drum 43, reduces the rotation of the input shaft 41 of the drive motor 33 by the friction force, and is linked to the input shaft 41. By reducing the rotation of the shaft 36, the rotational speed of the drive pinion 37 is reduced, and the elevator 14 is moved up and down at a constant speed.

  Further, as shown in FIG. 6, a torque limiter 51 as a torque detecting means for detecting torque acting on the brake drum 43 of the drum brake 42 is interposed above the drum brake 42.

  As shown in FIG. 6, the torque limiter 51 (for example, TL250-1 manufactured by Sakai Headquarters) holds the connecting body 52 with a predetermined tightening force, and the drum brake 42 has a predetermined value against the tightening force. When the above torque is applied, the holding of the connecting body 52 connected from the torque limiter 51 to the drum brake 42 is released, and the pinion stop mechanism 60 is operated to fix the brake pinion shaft 66. ing.

  As shown in FIG. 7, the connecting body 52 is provided with a large-diameter spar gear 53 and a small-diameter pinion gear 54 that meshes with the gear. Further, the base end side of the connecting plate 55 is connected to the pinion gear 54 to the connecting shaft 56 of the pinion gear 54, and the connecting plate 55 is rotatably connected about the connecting shaft 56.

  Further, as shown in FIG. 7, a spur gear 53 is attached to the upper portion of the brake drum 43 with a screw, and a cylindrical holder 57 is connected to the torque limiter 51. It is attached with a shaft end cover attaching bolt 47 so as to be integrated with the drum 43.

  As shown in FIGS. 8 and 9, the pinion stop mechanism 60 includes a non-excitation actuated brake 61 that is a kind of electromagnetic clutch / brake. The electromagnetic clutch / brake is a device for connecting / disconnecting / braking / holding a machine by electromagnetic force generated by energizing a coil. The non-excitation actuated brake 61 is a brake that operates with the force of a spring when the power to the coil is cut off, such as during a power failure.

  As the non-excitation actuating brake 61, for example, a 458 model manufactured by Miki Pulley Co., Ltd. can be used. This includes a mounting flange, a stator having a built-in exciting coil and attached to the mounting flange via a stud bolt, and an armature disposed on the front surface of the stator and slidably attached to the stud bolt in the axial direction. And a rotor disposed between the mounting flange and the armature, and a torque spring loosely fitted to the stud bolt and pressing the armature toward the mounting flange. Further, a release lever 62 for releasing the brake pinion shaft 66 by manual operation is provided outside the case.

  When the coil energization of the non-excitation actuated brake 61 is cut off, the magnetic flux disappears and the armature is instantaneously released from the stator by the restoring force of the contracted torque spring, the rotor is sandwiched between the armature and the mounting flange, and the friction force The shaft is braked and held.

  At this time, a certain gap is maintained between the stator and the armature. When the coil is energized, the stator overcomes the torque spring compressive force and sucks the armature, the rotor enters a free state, and the brake pinion shaft 66 is released.

  Further, even in the non-energized state at the time of power failure, the armature is pushed to the stator side by tilting the release lever 62 toward the stator side, the rotor becomes free and the brake pinion shaft 66 is released. The release lever 62 is urged so as to be upright when there is no external force. In the present embodiment, during normal operation, the lever abutting member 63 is abutted and the release lever 62 is tilted to the stator side, the brake pinion shaft 66 is released, and the elevating body 14 can be raised and lowered.

  As shown in FIG. 7, a lever abutting member 63 having a square shape in a plan view is connected to the fixed frame 20 of the driving unit so as to be rotatable about a connecting shaft 64. The lever contact member 63 and the connecting plate 55 are connected by a connecting string 65.

  During normal operation, the lever contact member 63 is in contact with the release lever 62 of the non-excitation actuated brake 61, and in this state, braking to the brake pinion shaft 66 is released.

  On the other hand, when the abutting of the lever abutting member 63 is released at the time of acceleration or the like, the braking mechanism of the non-excitation actuating brake 61 works, the braking pinion shaft 66 is braked, and the braking pinion 38 is Stopped. In this embodiment, the elevator 14 is forcibly stopped by braking the brake pinion shaft 66.

  In such a configuration, the elevator 11 according to the present embodiment allows the elevator 14 to move up and down by traveling while the drive pinion 37 and the brake pinion 38 mesh with each other during the normal elevation. .

  And when it is at the time of a power failure, the electric power feeding to a drive motor will be cut off and the raising / lowering body 14 will stop on the spot. When the elevating body 14 stops at the upper side in the hollow portion of the tower 90, it is necessary to lower the elevating body 14 manually. The elevator 11 in the present embodiment includes a manual lowering mechanism 28 that is manually lowered when stopped at a power failure. Hereinafter, the manual lowering mechanism 28 of the elevator 11 during a power failure will be described with reference to FIGS.

  As shown in FIGS. 2 and 3, the manual lowering mechanism 28 has a brake release lever 71 on the fixed frame 20, and the brake release lever 71 is disposed below the right vertical frame piece 24 b of the fixed frame 20. Yes. The brake release lever 71 is pivotally connected to the side wall of the right vertical frame piece 24b so that the base end of the brake release lever 71 can be pivoted up and down in the middle of the right vertical frame piece 24b. Has been.

  Further, by inserting a lock pin 75 into a pin hole formed in the right vertical frame piece 24b, the brake release lever 71 is attached and fixed to the inner side portion of the right vertical frame piece 24b. The lock pin 75 is fixed so that the brake release lever 71 is not operated during normal operation other than emergency.

  Further, one end of the wire 78 is connected to the middle portion of the brake release lever 71, and the other end of the wire 78 is connected to a mechanism for releasing a later-described brake function on the drive motor 33 side. The wire 78 is of a type in which an inner wire is slidably inserted into the cover, and is disposed along the right vertical frame piece 24b.

  As shown in FIG. 6, the drive motor 33 has a manual release lever 80 for manually releasing the brake function. By tilting the manual release lever 80 upward, a brake (not shown) in the drive motor 33 is provided. The spring of the function is pushed to form a gap between the armature and the disc plate so as to release the braking force. When the manual release lever 80 is tilted downward, the brake function spring in the drive motor 33 is released, and the armature is pressed against the disc plate so that the brake function is activated.

  In such a drive motor 33, the other end of the wire 78 from the brake release lever 71 is linked to one end of the manual release lever 80. The manual release lever 80 is connected to a fixing member (not shown) installed at a predetermined position of the main body of the drive motor 33 via a coil spring 82. The coil spring 82 urges the manual release lever 80 to the lower side which is the operating side (the side where the brake is not released).

  Next, an operation method of the manual lowering mechanism 28 will be described. First, as shown in FIGS. 2 and 3, the lock pin 75 installed on the brake release lever 71 is removed to make the brake release lever 71 rotatable. Next, the brake release lever 71 is held by hand, and the brake release lever 71 is pulled upward in the direction A shown in FIG. The pulled wire 78 is pulled from one end thereof.

  As a result, the wire 78 can be rotated upward about the shaft 81 of the manual release lever 80 of the brake function of the drive motor 33 on the other end side of the wire 78. The drive motor 33 is provided with a mechanism for biasing the spring by the rotation of the manual release lever 80.

  That is, the spring is biased by the rotation of the manual release lever 80 to form a gap between the armature in the drive motor 33 and the disk plate, thereby releasing the braking force. In this way, the brake operation of the drive motor 33 can be released.

  The elevator 11 descends at a constant speed while braking by the braking mechanism 34. That is, in the drum brake 42, the shoe support 49 of the brake shoe 44 is extended by the action of centrifugal force as the input shaft 41 of the drive motor 33 rotates, and thereby the outer peripheral surface of the shoe 50 extends outward. The outer peripheral surface of the shoe 50 abuts on the inner peripheral surface of the brake drum 43, and the rotation of the input shaft 41 of the drive motor 33 is reduced by the frictional force, and the pinion drive shaft 36 linked to the input shaft 41 is rotated. The elevating body 14 is lowered to a predetermined safe position at a constant speed.

  Further, the drive motor 33 is provided with a reduction gear (not shown), and the reduction gear can suppress the rotational movement of the drive pinion 37. This also suppresses the descent speed of the elevating body 14 to be constant. You can descend at speed.

  As a result, the elevator 11 in this embodiment can be lowered to a predetermined safe position even if a power failure or a drive system fails. After lowering the elevator 11 to a safe position, the brake release lever 71 is returned to its original position, so that the brake function is applied to the drive motor 33 and the lowering of the elevator 14 is stopped.

  Next, a method for stopping the elevating body 14 when an excessive descent speed is reached during the manual descent will be described.

  When an abnormality such as an overload occurs during the manual lowering, the manual lowering speed increases, and the rotational speed of the driving pinion 37 also increases. As a result, the rotation speed of the input shaft 41 of the drive motor 33 is increased, and when the drum brake 42 is operated, heat is generated by friction between the outer peripheral surface of the brake shoe 44 and the inner peripheral surface of the brake drum 43, The frictional heat reduces the frictional force between the outer peripheral surface of the brake shoe 44 and the inner peripheral surface of the brake drum 43, thereby reducing the braking force.

  Therefore, in the present embodiment, before the braking force is reduced, the torque limiter 51 detects that the torque acting on the brake drum 43 has reached a predetermined value or more. 43 is released, whereby the pinion stop mechanism 60 is operated, and the elevating body 14 is forcibly stopped.

  That is, when the overload 14 is overloaded in an emergency, the brake drum 43 is loaded with a rotational speed due to the overload, and the torque limiter 51 is applied with a torque greater than a predetermined value on the brake drum 43. In that case, the holding of the coupling body 52 by the torque limiter 51 is released.

  Thereby, the holding by the holding body 57 connected between the torque limiter 51 and the brake drum 43 is released, and the brake drum 43 becomes rotatable. Then, the brake drum 43 rotates counterclockwise, and the spur gear 53 disposed on the upper portion of the brake drum 43 also rotates counterclockwise. Further, the pinion gear 54 meshed with the spar gear 53 rotates, and the connecting plate 55 connected to the pinion gear 54 also rotates clockwise.

  In this way, the connecting string 65 connected to the connecting plate 55 is pulled, and the connecting string 65 pulls the lever abutting member 63, thereby releasing the release lever 62 of the non-excitation actuating brake 61 by the lever abutting member 63. The contact with the is released.

  As a result, the brake operation of the non-excitation actuating brake 61 works, and the brake pinion shaft 66 linked to the non-excitation actuating brake 61 is braked. As a result, the brake pinion 38 is braked, and when the elevating body 14 is descending at an excessive descending speed, the elevation is stopped.

  As described above, the elevator 11 according to the present embodiment frees the drive pinion 37 by releasing the brake function of the drive motor 33 that has been activated when power is not supplied or when the drive system has failed by the manual lowering mechanism 28. In this state, the elevating body 14 is lowered by its own weight, and the elevating body 14 is lowered at a constant speed by braking of the drum brake that receives the rotational force of the drive pinion 37.

  Thereby, even if it is in the state which the raising / lowering body 14 stopped at the time of a power failure or a failure of a drive system, the person who rides on the raising / lowering body 14 can get off to a safe place.

  Further, when the vehicle is lowered manually, for example, even when an excessive load is applied and an excessive descending speed is detected, the excessive descending speed is detected by a torque detecting means provided in the drive unit, and the elevator is operated by the pinion stop mechanism 60. 11 is stopped, so that safety is provided even in the event of an emergency.

  In addition, although this embodiment demonstrated the elevator 11 installed in the tower 90 of a wind power generator, it is not restricted to this, For example, it applies also to the monorail etc. which raise / lower the inside of a dam or the inclined surface of a predetermined gradient. Can do. It can also be applied to a monorail for transportation of people and a monorail for construction.

DESCRIPTION OF SYMBOLS 11 Elevator 13 Rail 15 Rack 28 Manual descent mechanism 33 Electromagnetic motor 36 Pinion drive shaft 37 Drive pinion 38 Brake pinion 42 Drum brake 51 Torque limiter 60 Pinion stop mechanism 61 Non-excitation actuated brake

Claims (3)

A rail is laid vertically in a hollow part of a hollow cylindrical body that rises above the ground surface, and a lifting body on which the operator can get on the rail is supported so as to be able to get on and off. The pinion is interlocked and connected to the output shaft of the drive motor in the elevator of this type, and the elevator is configured to move up and down within the hollow cylindrical body by driving the drive motor by energization.
In addition, when the drive motor is de-energized, the stop mechanism built into the drive motor is used to stop the rotation of the pinion and to stop the operation of the elevator,
In addition, a manual lowering mechanism is linked to the stop mechanism, and when the elevator is inadvertently stopped, the drive motor's stop mechanism is released by the manual lowering mechanism, so that the rotation of the pinion is made idle by the weight of the lifting body. It is configured to move down and torque detection means is attached to the pinion shaft.
When the excessive descending speed of the lifting body due to the rotation of the pinion or more is detected, the brake pinion separately attached to the rack is stopped by the pinion stopping mechanism to stop the lifting of the lifting body. . The pinion stop mechanism has a non-excitation actuated brake,
2. The elevator according to claim 1, wherein the non-excitation actuated brake brakes the drive shaft of the brake pinion when the torque detection means detects an excessive descending speed of the elevator due to rotation of the pinion more than a predetermined value. Manual lowering mechanism.   3. The manual lowering mechanism for an elevator according to claim 1 or 2, wherein the elevating body includes a boarding part that allows one worker to board in a standing state.

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