JP2011026130A - Elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To descend a car with heavy hanging load so as not to reach to an operation speed of an emergency stop device of the car at rescue operation in an elevator in which the car and a counterweight are connected to a main cable wound on a drive sheave of a hoisting machine. <P>SOLUTION: The car 8 and the counterweight 10 are connected to the main cable 12 wound on the drive sheave 5 of the hoisting machine 3. Further, an electromagnetic braking machine 6 and a speed detector 7 are provided on the hoisting machine 3, and a rescue operation operating unit 21 having a rescue operation button 22 is connected to a control panel. When the rescue operation button 22 is pushed, a control device 16 for rescue operation provided on the control panel releases braking operation of the electromagnetic braking machine 6 and makes the drive sheave 5 rotatable. Thereafter, the control device 16 for rescue operation resets the braking action of the electromagnetic braking machine 6 and brakes rotation of the drive sheave 5 before a speed of the car 8 detected by the speed detector 7 reaches to a predetermined speed that the emergency stop device 15 is operated to stop the car 8. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to an elevator that releases a brake of a hoisting machine and stops a car at a landing by lowering a heavier one of a car and a counterweight when an abnormal stop occurs.

  FIG. 16 is a diagram conceptually illustrating the configuration of a conventional elevator rescue operation apparatus disclosed in Patent Document 1 below, for example. In the figure, 101 is an elevator hoisting machine, 102 is an electromagnetic brake provided in the electric motor of the hoisting machine 101, 103 is a release mechanism that releases the electromagnetic brake 102 by human operation, 104 is a brake release lever, and 105 is One end of the control wire is connected to the release mechanism 103 and the other end is connected to the brake release lever 104.

  The conventional elevator rescue operation apparatus is configured as described above, and the brake release lever 104 is pressed by human operation when the elevator stops abnormally. The control wire 105 is pulled by this pressing operation, the release mechanism 103 is operated by the control wire 105, and the braking of the electromagnetic brake 102 is released.

  Although the illustration is omitted, the main rope is wound around the driving sheave of the hoisting machine 101, and one of the car and the counterweight connected to both ends of the main rope has the larger suspension load. A rescue operation is performed to lower one of the two. Then, the car is stopped at a nearby landing and the passengers in the car are rescued. Note that the weight of the counterweight is generally set to be equal to the suspension load when 1/2 of the capacity is loaded on the car.

Japanese Patent Laid-Open No. 3-272888

  In the conventional rescue operation apparatus for an elevator as described above, when the braking of the electromagnetic brake 102 is released by an artificial operation when the elevator stops abnormally, the heavier of the two descends and gradually accelerates. At this time, when the car descends and the descending speed reaches the operating value of the elevator abnormal speed detecting device (not shown), an emergency stop device (not shown) provided in the car is operated, and the car is used for the car. Restrained by a guide rail (not shown).

  Further, the cage restraining function when the emergency stop device is operated is configured not to automatically return. For this reason, to release the restraint of the car, it is necessary to lift the car once by human operation. Therefore, when the emergency stop device operates at an increased speed during the rescue operation for lowering the car, there is a problem that it takes time to release the restraint of the car, and the passenger can be locked in the car for a long time. .

  The present invention has been made in order to solve such a problem, and a heavy load is applied to both a car and a counterweight connected to both ends of a main rope wound around a driving sheave of a hoisting machine. The object is to obtain an elevator that lowers the car so that it does not reach the operating speed of the car safety device.

  The elevator according to the present invention includes a control panel provided in the hoistway, a main rope that connects the car and the counterweight so that the car and the counterweight are raised and lowered in opposite directions, and the main rope is wound around the main rope. Connected to a hoisting machine having a driven sheave, an emergency stop device provided in a car, an electromagnetic brake provided in the hoisting machine, a speed detector provided in the hoisting machine, and a control panel When the rescue operation button is pressed when the rescue operation button having the rescue operation button and the control panel are provided and the electromagnetic brake is braked and the driving sheave is stationary, the brake of the electromagnetic brake is Release the operation to allow the drive sheave to rotate, and then return the braking operation of the electromagnetic brake before the car speed detected by the speed detector reaches the predetermined speed at which the emergency stop device operates. Rescue operation to stop the car by braking the rotation of the drive sheave It is obtained and a control device.

  According to the present invention, a car with a heavy lifting load in both the car and the counterweight connected to the main rope wound on the driving sheave of the hoist does not reach the operating speed of the car emergency stop device. So that it can be lowered.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows Embodiment 1 of this invention, and is a perspective view which shows notionally the structure of an elevator. The elevation which explains the rescue driving situation in the elevator of FIG. The principal part electric circuit diagram of the control apparatus for rescue operation in the elevator of FIG. The graph which shows the relationship between time passage when the brake of the electromagnetic brake of the hoisting machine in the elevator of FIG. 1 is released, and the descent speed of the car. The enlarged view of the electromagnetic brake of the hoisting machine in the elevator of FIG. It is a figure which shows Embodiment 2 of this invention, and is a principal part electric circuit diagram of the control apparatus for rescue operation in an elevator. The graph which shows the relationship between time passage when the brake of the electromagnetic brake of the hoisting machine in the elevator of FIG. 6 is released and the descent speed of the car. It is a figure which shows Embodiment 3 of this invention, and is an elevation figure explaining the rescue driving condition in an elevator. The enlarged view which shows notionally the rescue operation device of FIG. The figure which shows the operation state of the operation mechanism for rescue operation of FIG. The graph which shows the relationship between time passage when the brake of the electromagnetic brake of the hoisting machine in the elevator of FIG. 8 is released, and the descent speed of the car. FIG. 10 is an enlarged longitudinal sectional view of the time-extinguishing device in FIG. 9. The figure explaining the operating state of the time-extinguishing apparatus of FIG. It is a figure which shows Embodiment 4 of this invention, and is an expanded longitudinal cross-sectional view of a time-extinguishing apparatus. AA line sectional view of Drawing 14. The figure which shows notionally the structure of the rescue operation apparatus of the conventional elevator.

Embodiment 1 FIG.
1 to 5 are diagrams showing an example of an embodiment of the present invention. FIG. 1 is a perspective view conceptually showing the configuration of an elevator. FIG. 2 is an elevational view for explaining a rescue operation situation in the elevator of FIG. FIG. 3 is an electric circuit diagram of the main part of the rescue operation control apparatus in the elevator of FIG. 1, and FIG. FIG. 5 is an enlarged view of the electromagnetic brake of the hoisting machine in the elevator of FIG.

  In the figure, 1 is a hoistway, 2 is a landing provided in the hoistway 1 and spaced apart from each other in the vertical direction, 3 is a hoisting machine installed on the upper part of the hoistway 1, and includes a drive motor 4, a drive rope A vehicle 5, an electromagnetic brake 6 and a speed detector 7 which will be described later are provided. 8 is a car that moves up and down a predetermined path of the hoistway 1, 9 is a rail for a car that is erected on the hoistway 1 to guide the raising and lowering of the car 8, and 10 is a counterweight that moves up and down the other predetermined path of the hoistway 1. , 11 is a counterweight rail that is erected on the hoistway 1 and guides the lift of the counterweight 10.

  Reference numeral 12 denotes a main rope, one end of which is connected to a fixed body at the upper part of the hoistway 1 and is lifted by being wound around a pulley pivotally attached to the lower part of the descending cage 8, and is wound around the driving sheave 5 and lowered. The lift is wound around a suspension vehicle pivotally attached to the counterweight 10, and the other end is connected to a fixed body at the upper part of the hoistway 1. 13 is a speed governor installed at the upper part of the hoistway 1, 14 is a speed control rope, which is endless and is wound around the speed governor of the speed governor 13 and suspended on the hoistway 1, and one side is a car 8 is engaged.

  Reference numeral 15 denotes an emergency stop device provided at a lower portion of the car 8, and an operating portion is connected to the speed control rope 14. The movement of the governor rope 14 is prevented by the operation of the governor 13 when the descending speed of the car 8 is 1.4 times the rated speed. Due to the relative displacement between the car 8 and the speed control rope 14 at this time, the operating portion presses the car rail 9 to brake the descent of the car 8.

  16 is a rescue operation control device provided on the control panel of the elevator, 17 is a predetermined speed detecting means, 18 is a rescue operation relay, 19 is a normally closed contact of the rescue operation relay 18, 20 is a battery power source, and 21 is a rescue operation operation. Vessel 22 is a rescue operation button. Reference numeral 23 denotes a frame of the hoisting machine 3, 24 denotes a brake drum fixed to the output shaft of the drive motor 4, and 25 denotes an arm whose one end is pivotally supported by the frame 23.

  26 is a brake shoe provided on the arm 25 and facing the brake drum 24, 27 is a suction plate provided on the arm 25 and disposed on the anti-brake shoe 26 side, and 28 is provided on the frame 23 and faces the suction plate 27. The electromagnet 29 is provided on the frame 23 and inserted into the pivot end side of the arm 25, 30 is the wiring of the electromagnet 28, 31 is a pressing spring, and one end is at the tip of the support shaft 29. The other end is locked to the rotating end of the arm 25 and presses the brake shoe 26 against the brake drum 24 via the arm 25.

  In FIG. 4, V0 is the operating speed of the emergency stop device 15 when the car 8 is lowered, V1 is the braking release preventing speed of the electromagnetic brake 6, and t0 is the operating speed of the emergency stop device 15 when the car 8 is lowered. The operation speed time, t1, is the rescue operation time until the brake release prevention speed of the electromagnetic brake 6 is reached.

  In the elevator configured as described above, the drive motor 4 of the hoisting machine 3 is energized and the drive sheave 5 rotates. As a result, the car 8 is guided by the main rope 12 to the car rail 9 and the counterweight 10 is guided to the counterweight rail 11 to move up and down in opposite directions, and the car 8 stops at the required landing 2. .

  When the drive motor 4 is energized, the electromagnet 28 of the electromagnetic brake 6 is energized, and the brake of the drive sheave 5 is released by attracting the suction plate 27 against the pressing force of the pressing spring 31. The When the drive motor 4 is de-energized, the electromagnet 28 of the electromagnetic brake 6 is de-energized, and the drive sheave 5 is braked by the brake shoe 26 by the pressing force of the pressing spring 31.

  When the elevator breaks down and stops abnormally, the passenger in the car 8 is rescued as described below. That is, the rescue operation controller 21 is connected to the rescue operation control device 16 by the staff, and the rescue operation button 22 is pressed. Accordingly, the electromagnet 28 of the electromagnetic brake 6 is energized by the circuit of the battery power source 20-the rescue operation button 22-the normally closed contact 19 of the rescue operation relay 18-the electromagnet 28-the battery power source 20, and the drive sheave 5 The braking is released.

  As a result, the heavier suspension load of both the car 8 and the counterweight 10 is lowered. The speed due to the lowering is detected by the speed detector 7 of the hoisting machine 3, and the lowering speed is gradually accelerated, but the detected speed is lower than the operating value of the emergency stop device 15 of the car 8, that is, FIG. When the speed V1 shown in FIG. 4 is reached, the predetermined speed detecting means 17 operates. By this operation, the rescue operation relay 18 is energized and the normally closed contact 19 is opened. For this reason, even if the rescue operation button 22 is pressed, the electromagnet 28 of the electromagnetic brake 6 is de-energized, so that the drive sheave 5 is braked and the car 8 stops.

  Therefore, even if the lowering of the car 8 is accelerated during the rescue operation for lowering the car 8 due to the difference in the suspension load from the counterweight 10, the driving sheave 5 is braked before the speed reaches the operating value of the emergency stop device 15. Is done. For this reason, the emergency stop device 15 does not operate during the rescue operation for lowering the car 8, and the car 8 can be quickly and easily stopped at the landing 2 to rescue the passengers in the car 8.

  Note that the car 8 stopped through the operation of the predetermined speed detecting means 17 is released again, and when the rescue operation button 22 is pressed, the electromagnet 28 of the electromagnetic brake 6 is energized and the braking of the drive sheave 5 is released. It is lowered by being done. In the rescue operation for lowering the car 8, the clerk opens the door of the landing 2 slightly, operates the rescue operation button 22 while watching the behavior of the car 8, and stops the car 8 at the landing 2.

Embodiment 2. FIG.
6 and 7 are diagrams showing an example of another embodiment of the present invention. FIG. 6 is an electric circuit diagram of a main part of the control device for rescue operation in the elevator. FIG. 7 is a hoisting machine in the elevator of FIG. It is a graph which shows the relationship between the time passage when the brake of this electromagnetic brake is released and the descent speed of the car. In addition to FIG.6 and FIG.7, the rescue operation apparatus of the traction type elevator is comprised similarly to embodiment of the above-mentioned FIGS. In the figure, the same reference numerals as those in FIGS.

  Reference numeral 32 denotes a predetermined time detection means. When the elevator is abnormally stopped, the braking of the drive sheave 5 is released, and when the heavier one of the car 8 and the counterweight 10 descends, the descending speed is reduced. It operates with the shortest time period to reach a predetermined speed that is less than the operating value of the car safety device 15.

  In FIG. 7, V0 is the operating speed of the emergency stop device 15 when the car 8 is lowered, V1 is the braking release prevention speed of the electromagnetic brake 6 by the predetermined time detection means 32 described later, and t0 is the emergency stop device when the car 8 is lowered. The descending time until reaching the operating speed of 15, t1 is the rescue operation time until reaching the braking release prevention speed of the electromagnetic brake 6.

  In the elevator configured as described above, the elevator is operated in the same manner as in the above-described embodiments of FIGS. 1 to 5, and the hoisting machine 3 is braked and stopped by the electromagnetic brake 6. When the elevator breaks down and stops abnormally, the passenger in the car 8 is rescued as described below.

  That is, the rescue operation controller 21 is connected to the rescue operation control device 16 by the staff, and the rescue operation button 22 is pressed. As a result, the electromagnet 28 of the electromagnetic brake 6 is energized by the circuit of the battery power source 20-rescue operation button 22-predetermined time detection means 32-electromagnet 28-battery power source 20 and the braking of the drive sheave 5 is released. The

  As a result, of the car 8 and the counterweight 10, the heavier suspension load is lowered, and this descent time is detected by the predetermined time detection means 32. Then, although the descending speed is gradually accelerated, a predetermined speed that is less than the operating value of the car safety device 15, that is, the shortest time period for reaching the speed V1 shown in FIG. 7, that is, the time t1 shown in FIG. The detection means 32 operates.

  When the predetermined time detection means 32 is operated, the electromagnet 28 of the electromagnetic brake 6 is de-energized, the drive sheave 5 is braked, and the car 8 stops. For this reason, even if the lowering of the car 8 is accelerated during the rescue operation for lowering the car 8 due to the difference in the suspension load from the counterweight 10, the driving sheave 5 is moved before the speed reaches the operating value of the emergency stop device 15. Braked. Therefore, although the detailed description is omitted, the same operation as the embodiment of FIGS. 1 to 5 can be obtained also in the embodiment of FIGS.

Embodiment 3 FIG.
FIGS. 8 to 13 are also diagrams showing an example of another embodiment of the present invention. FIG. 8 is an elevational view for explaining the rescue operation situation in the elevator, and FIG. 9 is a conceptual diagram of the rescue operation controller of FIG. FIG. 10 is a diagram showing the operating state of the rescue operation mechanism shown in FIG. 9, and FIG. 11 is the time elapsed when the brake of the electromagnetic brake of the hoisting machine in the elevator shown in FIG. FIG. 12 is an enlarged vertical cross-sectional view of the time-extinguishing device in FIG. 9, and FIG. 13 is a diagram for explaining the operating state of the time-extinguishing device in FIG.

  Except for FIGS. 8 to 13, a rescue operation apparatus for a traction type elevator is configured in the same manner as in the embodiment of FIGS. 1 to 5 described above. In the figure, the same reference numerals as those in FIGS. 1 to 5 indicate the corresponding parts, and 33 is an operation mechanism for rescue operation, which includes a traction device, a transmission device, and a time-extinguishing device described below.

  That is, 34 is a traction device, a base plate 35 disposed on the second floor of the landing, a support plate 36 standing on one side of the base plate 35, a foot lever 37 having one end pivotally attached to the base of the support plate 36, A transmission plate 38 fixed near the pivoting portion of the foot lever 37, and a transmission auxiliary plate 39 having one end pivoted at the upper end of the transmission plate 38 on the side opposite to the support plate 36 and the other end disposed below. Yes.

  Reference numeral 40 denotes a transmission device, which is a mounting body 41 provided at a mounting portion of the support shaft 29 in the frame 23 of the hoisting machine 3, one end pivotally mounted on the mounting body 41, and the other end of the braking drum 24 An operating cam 42 facing the side surface and a transmission cable 43 to be described later are provided. The transmission cable 43 has both ends inserted into the flexible tube 44 and the flexible tube 44 engaged with the support plate 36 and the mounting body 41, and one end connected to the longitudinal middle of the operating cam 42. The end is constituted by a flexible wire 45 inserted into the transmission plate 38 and connected to the transmission auxiliary plate 39.

  46 is a time-extinguishing device composed of a liquid damper. The cylinder 47 is mounted on the support plate 36 side of the transmission plate 38, is fitted to the cylinder 47 and protrudes from the transmission plate 38, and the tip is disposed in contact with the transmission auxiliary plate 39. Plunger 48, a spring 50 disposed in the cylinder 47 and pressing the piston 49 of the plunger 48, and provided on the inner bottom surface of the piston 47 of the piston 49 so as to face one of the orifices 51 of the piston 49. A valve plate 52 made of a viscoelastic material such as rubber is provided.

  In FIG. 11, V0 is the operating speed of the emergency stop device 15 when the car 8 is lowered, V1 is the braking release prevention speed of the electromagnetic brake 6 by the time-extinguishing device 46, and t0 is the speed of the emergency stop device 15 when the car 8 is lowered. The descending time of the car 8 until reaching the operating speed, t1 reaches the rescue operation time until reaching the braking release prevention speed of the electromagnetic brake 6, and t2 reaches the braking release prevention speed of the electromagnetic brake 6 by the time-extinguishing device 46. The fall time until.

  In the elevator configured as described above, the elevator is operated in the same manner as in the above-described embodiments of FIGS. 1 to 5, and the hoisting machine 3 is braked and stopped by the electromagnetic brake 6. When the elevator breaks down and stops abnormally, the passenger in the car 8 is rescued as described below.

  In other words, the rescue operation mechanism 33 is temporarily installed by the staff as shown in FIG. 8, and the foot lever 37 of the traction device 34 is pushed down in the state shown in FIG. As a result, the flexible wire 45 of the transmission cable 43 of the transmission device 40 is pulled through the transmission plate 38, the transmission auxiliary plate 39 and the time-extinguishing device 46. As a result, as shown in the upper part of FIG. 10, the arm 25 rotates against the pressing force of the pressing spring 31 by the operating cam 42 and the braking of the driving sheave 5 is released.

  Thereby, the heavier one of the car 8 and the counterweight 10 is lowered, and the descending speed is gradually accelerated with the passage of time. However, as time elapses after the transmission cable 43 starts to be pulled, the time-extinguishing device 46 starts to flow from the state shown in FIG. 12 to the plunger 48 side through the orifice of the piston 49. The state shown in FIG. 13 is obtained.

  As a result, the transmission auxiliary plate 39 approaches the transmission plate 38 and enters the state shown in the lower part of FIG. Therefore, the drive sheave 5 is braked by the time required to reach the brake release prevention speed of the electromagnetic brake 6 by the function of the time-extinguishing device 46 shown in FIG. 11, that is, the elapse of the descending time t2. Therefore, the descending speed with the heavier suspension load is limited to a predetermined speed that is less than the operating value of the car safety device 15, that is, the speed V1 shown in FIG.

  For this reason, during the rescue operation in which the car 8 is lowered due to the difference in the suspended load from the counterweight 10, the downward movement of the car 8 is accelerated by the manual operation of the rescue operation mechanism 33. Before reaching the operating value, the driving sheave 5 is braked and the car 8 is stopped by the function of the time-extinguishing device 46 of the rescue operation mechanism 33, that is, the function of eliminating the traction action by the transmission cable 43 after a predetermined time elapses. To do. Therefore, although the detailed description is omitted, the same operation as the embodiment of FIGS. 1 to 5 can be obtained also in the embodiment of FIGS.

  In the state shown in FIG. 10 in which the foot lever 37 of the traction device 34 is pushed down, if the clerk removes the foot from the foot lever 37, the traction force of the transmission cable 43 by the transmission plate 38 and the transmission auxiliary plate 39 disappears. Thereby, the plunger 48 returns to the protruding position as shown in FIG. 12 from the state shown in FIG. During the return operation of the time-extinguishing device 46, the valve plate 52 is bent as shown in FIG. 13, and both the orifices 51 are fully opened.

  Accordingly, since the liquid rapidly flows into the cylinder 47 through the orifice 51 that is fully opened during the returning operation of the time-extinguishing device 46, the plunger 48 rapidly protrudes and returns to the state shown in FIG. For this reason, at the time of rescue operation in which the car 8 and the counterweight 10 having the heavier load are lowered, the descent is accelerated and the driving sheave 5 is moved before the speed reaches the operating value of the emergency stop device 15. From the braked state, the stepping lever 37 of the traction device 34 can be quickly pushed down again. For this reason, the rescue operation can be repeated in a short time, and the work efficiency of the rescue operation can be improved.

Embodiment 4 FIG.
14 and 15 are also diagrams showing an example of another embodiment of the present invention. FIG. 14 is an enlarged longitudinal sectional view of the time-extinguishing device, and FIG. 15 is a sectional view taken along line AA in FIG. 14 and 15, the rescue driving device for the traction type elevator is configured in the same manner as in the embodiment of FIGS. 1 to 5 and the embodiment of FIGS. .

  In the figure, the same reference numerals as those in FIGS. 1 to 5 and 8 to 13 denote the corresponding parts, and 53 is a valve plate made of a circular plate of a viscoelastic material such as rubber and faces one of the orifices 51. A position deviated from the center of the circle is attached to the center of the piston 49 by a bolt 54 that is arranged and screwed into the center of the piston 49.

  In the elevator configured as described above, the elevator is operated in the same manner as in the above-described embodiments of FIGS. 1 to 5, and the hoisting machine 3 is braked and stopped by the electromagnetic brake 6. When the elevator breaks down and stops abnormally, the rescue operation mechanism 33 is temporarily installed by the staff and the stepping lever 37 is pushed down, as in the above-described embodiment of FIGS. 38, the flexible wire 45 of the transmission cable 43 is pulled through the transmission auxiliary plate 39 and the time-extinguishing device 46.

  As a result, the operation cam 42 is operated via the transmission cable 43, the braking of the drive sheave 5 is released, and the rescue operation of the passenger in the car 8 is performed. Therefore, although the detailed description is omitted, the same operation as the embodiment of FIGS. 8 to 13 can be obtained also in the embodiment of FIGS.

  Further, in the embodiment shown in FIGS. 14 and 15, by rotating the valve plate 53 about the center of the piston 49, one opening area of the orifice 51 at the normal time can be changed. For this reason, the function of the time-extinguishing device 46 when the stepping lever 37 of the rescue operation mechanism 33 is pushed down during the rescue operation of lowering the heavier suspension load of the car 8 and the counterweight 10, that is, The time until the traction action disappears of the transmission cable 43 corresponding to the braking release prevention speed of the electromagnetic brake 6 by the function of erasing the traction action by the transmission cable 43 after the predetermined time elapses can be appropriately adjusted.

  Accordingly, the time until the disappearance of the traction action of the transmission cable 43 corresponding to the suspension load difference between the car 8 and the counterweight 10 and the brake release prevention speed of the electromagnetic brake 6 that changes depending on the specification of the elevator is easily and optimally set. be able to. For this reason, it is possible to improve the work efficiency of the rescue operation in which the heavier one of the car 8 and the counterweight 10 is lowered.

Embodiment 5 FIG.
In the configuration of the above-described embodiment, the passenger in the car 8 can be rescued when the elevator stops abnormally by the following method. That is, when the elevator stops abnormally, the electromagnetic brake 6 of the hoisting machine 3 is released, and one of the heavier loads in both the car 8 and the counterweight 10 is lowered.

The electromagnetic brake 6 is braked before the lowering speed reaches a predetermined speed that is lower than the operating value of the car safety device 15.
Also, one of the heavier suspension loads is lowered, and the electromagnetic brake 6 is braked by the shortest time period when the lowering speed reaches a predetermined speed that is less than the operating value of the car safety device 15.

  Further, when the elevator stops abnormally, the rescue operation mechanism 33 is temporarily installed, and the electromagnetic brake 6 of the hoisting machine 3 is released by the manual operation of the traction device 34 via the transmission device 40, and the car 8 and the counterweight. One of the heavier suspension loads of both 10 is lowered. And the time-extinguishing device 46 which cancels the traction action of the transmission device 40 by the shortest time period when the descending speed reaches a predetermined speed which is less than the operating value of the car safety device 15 is provided. Thus, the electromagnetic brake 6 is braked.

  By such a rescue operation method of the traction type elevator, the electromagnetic brake 6 of the hoisting machine 3 is released and the descending of the car 8 is accelerated during the rescue operation in which the car 8 is lowered due to the difference in suspension load from the counterweight 10. Is done. However, the electromagnetic brake 6 performs a braking operation before the descending speed reaches the operating value of the safety device 15. For this reason, the emergency stop device 15 does not operate during the rescue operation of lowering the car 8, and the car 8 can be rescued quickly and easily to the landing 2, and passengers in the car 8 can be rescued.

  3 hoisting machine, 5 drive sheave, 6 electromagnetic brake, 8 car, 10 counterweight, 12 main rope, 15 emergency stop device, 16 rescue operation control device, 17 predetermined speed detecting means, 32 predetermined time limit detecting means 33 Operation mechanism for rescue operation, 34 traction device, 40 transmission device, 46 time deactivation device.

Claims (2)

A control panel provided in the hoistway;
A main rope that connects the car and the counterweight so that the car and the counterweight move up and down in opposite directions;
A hoisting machine having a driving sheave around which the main rope is wound;
An emergency stop device provided in the car;
An electromagnetic brake provided in the hoisting machine;
A speed detector provided in the hoisting machine;
A rescue operation device connected to the control panel and having a rescue operation button;
Provided in the control panel;
When the electromagnetic brake is braked and the drive sheave is stationary, when the rescue operation button is pressed, the braking operation of the electromagnetic brake is released to enable the drive sheave to rotate, Thereafter, before the speed of the car detected by the speed detector reaches a predetermined speed at which the emergency stop device operates, the braking operation of the electromagnetic brake is restored to brake the rotation of the driving sheave. A rescue operation control device for stopping the car;
Elevator with.   The elevator according to claim 1, wherein the rescue operation device is connected to the control panel by a staff member and operated from outside the hoistway.

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