JP2012218888A - Elevator with deceleration assist device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an elevator in which the depth of a pit of a hoistway is independent of the stroke of a shock absorber.SOLUTION: The elevator 1 is the elevator in which a car 3 and a counterweight 4 are suspended in a well bucket type inside the hoistway 2 by a main rope 5, and includes a first permanent magnet 41, a first electromagnet 42, and a second electromagnet 43. The first permanent magnet 41 is loaded on the counterweight 4. The first electromagnet 42 is disposed at the upper part of the hoistway 2 over a distance at least equivalent to a distance from a limit position C at which it is required to start deceleration of the car 3 to the floor 2A of the hoistway 2, and generates magnetic force in the direction of pulling the first permanent magnet 41 downwards. The second electromagnet 43 is installed at the upper end of the hoistway 2 and generates the magnetic force repulsive to the first permanent magnet 41.

Description

  Embodiments of the present invention relate to an elevator including a shock absorber that safely decelerates and stops a vehicle that has descended beyond a rated speed before reaching a pit floor.

  The elevator is equipped with a shock absorber that receives the riding so that the riding does not collide with the pit floor below the hoistway when the riding descends beyond the rated speed. The shock absorber must be decelerated and stopped safely for passengers in the boarding area. An upper limit of deceleration when decelerating the riding is determined. As a result, if the moving speed of the riding is fast, the stroke required for the shock absorber to decelerate the riding also increases accordingly. Therefore, some high-speed elevator shock absorbers installed in high-rise buildings are more than a dozen meters long.

  As a shock absorber, a spring type, an oil type, and a combination of these are generally known, and a magnetic type that is received by a repulsive force between a magnet and a superconductor is also known. These shock absorbers are installed between the lower part of the riding board and the pit floor, and are intended to stop the riding safely.

  Also, when the riding weight or counterweight is suddenly decelerated and stopped by the shock absorber at the lower part of the hoistway, the counterweight or hoisting weight attached to the opposite side of the main rope is overpowered and the hoistway ceiling There is an elevator equipped with a shock absorber between the carriage and the counterweight and the hoistway ceiling so that it does not collide with the elevator. This elevator assumes that the riding board or the counterweight jumps up, and aims to reduce the space required in the upper part of the hoistway to receive the riding board or the counterweight. This elevator prevents the counterweight from jumping up at the upper part of the hoistway when the riding board is decelerated at the lower part of the hoistway, and also when the counterweight is suddenly decelerated at the lower part of the hoistway. To prevent the norikura from jumping up at the top of the hoistway.

JP 2010-64862 A Japanese Utility Model Publication No.2-132083 JP-A 61-169475

  However, since the maximum deceleration when the vehicle is safely decelerated and stopped is defined, the stroke required for any elevator shock absorber to prevent the vehicle from colliding with the pit floor remains the same. The shock absorber is disposed in the pit so that the rider does not contact during normal operation. Therefore, the depth of the pit where the shock absorber is installed needs to be a depth corresponding to the stroke of the shock absorber.

  Therefore, the present invention provides an elevator in which the pit depth of the hoistway does not depend on the stroke of the shock absorber.

  An elevator according to an embodiment is an elevator in which a main rope is wound around a hoist installed at the upper part of a hoistway, and a riding rod and a counterweight are suspended in a hoistway manner in the hoistway by the main rope. A first permanent magnet, a first electromagnet, and a second electromagnet are provided. The first permanent magnet is mounted on the counterweight. The first electromagnet moves up and down over a distance at least corresponding to the distance from the limit position where it is necessary to start deceleration to stop the boarding safely in order to stop the boarding safely just before reaching the floor of the hoistway. Arranged at the top of the path, a magnetic force is generated in a direction to pull down the first permanent magnet. The second electromagnet is installed at the upper end of the hoistway and generates a magnetic force that repels the first permanent magnet.

Sectional drawing which shows the elevator of 1st Embodiment typically. Sectional drawing which shows the elevator of 2nd Embodiment typically. Sectional drawing in case the boarding of the elevator shown in FIG. 2 exists in the lower part of a hoistway. Sectional drawing which shows the elevator of 3rd Embodiment typically.

  The elevator 1 of 1st Embodiment is demonstrated with reference to FIG. An elevator 1 shown in FIG. 1 is an elevator 1 in which a riding rod 3 and a counterweight 4 are suspended by a main rope 5 in a hoistway manner in a hoistway 2. The hoisting machine 6 is installed in the upper part of the hoistway 2. In the case of the elevator 1, the machine room 101 is installed above the top floor, and the hoisting machine 6 is installed in the machine room 101. The main rope 5 is wound around the hoisting machine 6, and its end 5 a is directly connected to the riding rod 3 and the counterweight 4. When the hoist 6 is driven and the riding rod 3 is raised, the counterweight 4 is lowered, and when the riding rod 3 is lowered, the counterweight 4 is raised. The elevator 1 is roped in a so-called “1: 1 type”.

  As shown in FIG. 1, the elevator 1 includes a first permanent magnet 41, a first electromagnet 42, a second electromagnet 43, a speed sensor 31, a position detection sensor 32, and a buffer control device 71. Prepare. The first permanent magnet 41 is mounted on the counterweight 4. The first permanent magnet 41 is arranged in a direction in which magnetic poles are formed above and below the counterweight 4.

  The first electromagnet 42 is installed over a certain distance in the vertical direction above the hoistway 2. In this case, the constant distance means that even if the riding rod 3 is moving beyond the maximum descending speed, the riding rod 3 can be safely stopped immediately before reaching the floor 2A of the hoistway 2. This is a distance corresponding to at least the distance from the limit position C where the deceleration must be started to the floor 2A. The first electromagnet 42 generates a magnetic force in a direction in which the first permanent magnet 41 mounted on the counterweight 4 is pulled downward in the installed section.

  The first electromagnet 42 includes a plurality of coil segments 421 and is disposed around a trajectory along which the counterweight 4 moves. In the case of the first embodiment, the counterweight 4 is guided by a weight guide rail 4A. Each coil segment 421 includes a coil wound around the outer periphery of the coil segment 421 including the weight guide rail 4A. Each coil segment 421 is switched in the direction of the magnetic field generated according to the position of the counterweight 4, and acts in the direction of pulling down the first permanent magnet 41.

  The second electromagnet 43 is disposed across the trajectory of the counterweight 4 at the upper end of the hoistway 2. The second electromagnet 43 generates a magnetic force that repels the first permanent magnet 41 when electric power is supplied. The second electromagnet 43 acts on the first permanent magnet 41 mounted on the counterweight 4 when the riding rod 3 is at a position immediately before reaching the floor 2 </ b> A of the hoistway 2.

  The speed sensor 31 detects the moving speed of the riding rod 3. The speed of the riding board 3 can also be detected by the rotation speed of the hoisting machine 6 and the governor. However, these devices function when the elevator 1 is operating normally. Therefore, when the riding board 3 cannot be stopped even by the emergency stop device linked to the brake or governor of the hoisting machine 6, it is not known whether the speed detecting function of the hoisting machine 6 or the governor is effective. Therefore, in the first embodiment, the speed sensor 31 is provided in a separate system from the hoisting machine 6 and the governor, and is installed outside the riding rod 3, with respect to the inner wall of the hoistway 2 and the guide rail 3 </ b> A for the kite. Thus, the moving speed of the riding rod 3 is detected in a non-contact manner. An ultrasonic Doppler type sensor is employed as the non-contact speed sensor 31. Alternatively, two light quantity detection sensors may be installed in the traveling direction, and the moving speed of the riding rod 3 may be calculated from the correlation between the waveforms of signals obtained from the two sensors.

  The position detection sensor 32 measures the distance from the floor 2 </ b> A of the hoistway 2 to the riding rod 3. When directly measuring the distance from the riding board 3 to the floor 2A of the hoistway 2, the position detection sensor 32 is attached to the lower part of the riding board 3 or installed on the floor 2A of the hoistway 2. As a sensor for directly measuring a distance, a sensor using a triangulation method or a time-of-flight method is employed. Since the distance to be measured by the position detection sensor 32 is the limit position C corresponding to the moving speed of the riding rod 3, it is possible to detect the marker by previously detecting a marker placed on the inner wall of the guide rail 3 </ b> A and the hoistway 2. The position detection sensor 32 that determines the absolute position of the heel 3 may be used. In this case, the position detection sensor 32 may be installed not only in the lower part of the riding rod 3 but in a side part or an upper part.

  The buffer control device 71 may be provided in a part of the control panel 7 arranged in the machine room 101 or may be installed independently. The buffer control device 71 is connected to the first electromagnet 42, the coil segments 421 of the second electromagnet 43, the speed sensor 31, and the position detection sensor 32. If the position detection sensor 32 detects the limit position C in a state where the moving speed of the riding rod 3 detected by the speed sensor 31 exceeds the maximum speed set in the riding rod 3, the buffer control device 71 The electromagnet 42 is activated.

  The elevator 1 of the first embodiment further includes a secondary battery 72 for supplying power to the first electromagnet 42 and the second electromagnet 43 even during a power failure. The first electromagnet 42 and the second electromagnet 43 are arranged at the uppermost part of the hoistway 2. That is, every time the riding rod 3 approaches to land on the lowest floor or leaves to move to another floor, the first permanent magnet 41 mounted on the counterweight 4 becomes the first electromagnet. 42 and the second electromagnet 43 are approached or separated from each other. Therefore, an induced electromotive force when the first permanent magnet 41 approaches or separates from the first electromagnet 42 and the second electromagnet 43 in a state where the first electromagnet 42 is not operated, that is, during normal operation. Thus, the secondary battery 72 is charged. When the secondary battery 72 is sufficiently charged, the generated electric power may be used by the elevator 1 or supplied to the building.

  As shown in FIG. 1, when the riding rod 3 exceeds the limit position C, the counterweight 4 is in the section where the first electromagnet 42 is installed, and the first permanent magnet 41 is the first permanent magnet 41. It is at a position that is affected by the magnetic force of the electromagnet 42. If the vehicle 3 descends beyond the maximum speed when it reaches the limit position C, the buffer control device 71 is activated to energize the first electromagnet 42. As a result, the counterweight is decelerated by receiving a force in the direction in which the first permanent magnet 41 is pulled downward. That is, the riding rod 3 connected by the main rope 5 is also decelerated. When the counterweight 4 reaches the uppermost part of the hoistway 2, the second electromagnet 43 is actuated by the buffer control device 71. The first permanent magnet 41 receives a magnetic force pulled downward by the first electromagnet 42 and receives a magnetic force pushed back downward by the second electromagnet 43. The counterweight 4 is held at the upper part of the hoistway 2, and the riding rod 3 connected by the main rope 5 stops at the lower part of the hoistway.

  In this specification, the “limit position” may appropriately change according to the moving speed of the moving platform 3 and the position in the hoistway 2. In this case, the buffer control device 71 sets the limit position C from the signals of the speed sensor 31 and the position detection sensor 32 when an abnormality in the operation of the hoisting machine 6 or the governor is detected via the control panel 7. When the riding rod 3 approaches the limit position C, the first electromagnet 42 and the second electromagnet 43 are controlled to operate. Further, when the position of the counterweight 4 corresponding to the limit position C set on the riding rod 3 is within the installation range of the first electromagnet 42, the riding rod 3 is set so that the deceleration rate of the riding rod 3 is reduced. The first electromagnet 42 may be operated from the stage before reaching the limit position C.

  The elevator 1 configured as described above has a counterweight 4 that is connected to the rider 3 by a main rope 5 in a hanging manner when the rider 3 descends beyond the maximum speed. The vehicle 3 is decelerated and stopped safely by decelerating and stopping. In the case of the elevator 1, the counterweight 4 is braked by a magnetic force, so that a shock absorber having a long stroke is not required under the riding rod 3. That is, the first permanent magnet 41 mounted on the counterweight 4, the first electromagnet 42 disposed around the trajectory of the counterweight 4, and the second electromagnet disposed on the upper end of the hoistway 2. 43 functions as the shock absorber 8 when it is necessary to stop the riding rod 3 urgently.

  The counterweight 4 does not receive the magnetic force of the first electromagnet 42 and the second electromagnet 43 in the normal operation state, and is operated by the buffer control device 71 only when it is necessary to make the riding rod 3 emergency stop. The magnetic force of the first electromagnet 42 and the second electromagnet 43 is received, and the vehicle is decelerated and stopped within the normal movement range. The riding board 3 is also decelerated and stopped within the normal movement range. In other words, the first permanent magnet 41, the first electromagnet 42, and the second electromagnet 43 function as a shock absorber, and the stroke as the shock absorber 8 moves the riding rod 3 and the counterweight 4 during normal operation. It overlaps the range to be. As a result, it is not necessary to install a mechanical shock absorber having a long stroke according to the maximum moving speed of the carriage 3 in the pit of the hoistway.

  Furthermore, if the position at which the riding rod 3 stops by stopping the counterweight 4 is set to the landing position on the lowest floor, the first permanent magnet 41, the first electromagnet 42, and the second electromagnet 43 When the constructed shock absorber 8 is activated, the passenger can be escaped immediately.

  Each coil segment 421 of the first electromagnet 42 may be configured to generate a stronger magnetic force as it is closer to the upper end of the hoistway 2. By doing in this way, it is suitable for gradually increasing the force which decelerates the counterweight 4 and hence the riding rod 3. Further, as the counterweight 4 is inserted into the first electromagnet 42, the force received by the first permanent magnet increases and the moving speed also decreases. Therefore, the magnetic force may be weakened as it approaches the upper end of the hoistway 2.

  Further, when the carriage 3 passes the counterweight 4, the side of the carriage 3 facing the trajectory of the counterweight 4 is arranged so that the passenger of the carriage 3 is not affected by the magnetic field of the first permanent magnet 41. A magnetic shielding material may be installed. Further, a second permanent magnet may be installed at a position where the counterweight 4 is desired to be held. Even if the power supplied to the first electromagnet 42 and the second electromagnet 43 decreases, the first permanent magnet 41 is held by the second permanent magnet. A demagnetizing coil for canceling the magnetic field of the second permanent magnet is installed outside the second permanent magnet so that the second permanent magnet does not attract the first permanent magnet 41 during normal operation.

  On the floor 2A of the hoistway 2, the riding rod 3 falls freely from the vicinity of the limit position C, or the riding rod 3 is in a state where the counterweight 4 is within the range where the first electromagnet 42 is installed. Even in the case of assuming free fall, a mechanical shock absorber 8M for safely receiving the riding rod 3 is installed. At this time, the moving speed of the riding rod 3 is sufficiently smaller than the maximum speed. Therefore, it is sufficient that the shock absorber 8M has a shorter stroke than when the maximum speed riding 3 is received. That is, the pit of the hoistway 2 required for the shock absorber 8M becomes shallow. It is also possible to increase the moving speed of the riding car 3 or renew the elevator 1 having a higher moving speed of the riding car 3 without digging down the pits of the current building.

  Further, according to the elevator 1, the counterweight 3 connected to the counterweight 4 by the main rope 5 is decelerated and stopped by braking the counterweight 4 with a magnetic force. Therefore, even when a cowl or a hood is attached to the riding board 3 in consideration of aerodynamic characteristics as a high-speed elevator, these are not damaged.

  The elevator 1 of 2nd Embodiment is demonstrated with reference to FIG. 2 and FIG. The elevator 1 shown in FIG. 2 includes a first permanent magnet 41, a first electromagnet 42, a second electromagnet 43, a speed sensor 31, a position detection sensor 32, and a buffer control device 71 included in the elevator 1 according to the first embodiment. In addition to the above facilities, a third electromagnet 33 and a fourth electromagnet 34 are further provided. In each figure, the same reference numerals are given to configurations having the same functions as those in the first embodiment, and the detailed description refers to the corresponding descriptions in the first embodiment.

  As shown in FIGS. 2 and 3, the third electromagnet 33 is disposed on the side wall of the riding rod 3 facing the guide rail 3 </ b> A. The third electromagnet 33 is composed of a plurality of units 331 arranged in the moving direction of the riding rod 3. Electric power required for each unit 331 is supplied via a tail cord connected to the riding rod 3. The third electromagnet 33 generates a desired magnetic field by controlling current and voltage for each unit 331.

  As shown in FIG. 3, the fourth electromagnet 34 is located at the maximum descending speed set on the riding rod 3 on the outer side of the guide rail 3 </ b> A for the riding rod 3 so as to face the third electromagnet. It is installed at least in the range from the limit position C shown in FIG. 2 set to the above speed to the lower end of the hoistway 2. Therefore, the fourth electromagnet 34 may be installed from above the limit position C. The fourth electromagnet 34 is constituted by a plurality of units 341 arranged in the moving direction of the riding rod 3.

  Each unit 341 is individually controlled and generates a desired magnetic field in the same manner as the coil segment 421 of the first electromagnet 42 and the unit 331 of the third electromagnet 33. In the case of the second embodiment, the fourth electromagnet 34 is controlled so as to generate a magnetic force in the direction of pulling the third electromagnet 33 upward by acting on the magnetic field formed by the third electromagnet 33. Is done.

  Further, in this elevator 1, the riding rod 3 has a third outer side of the side wall as shown in FIG. 3 so that the magnetic fields generated by the third electromagnet 33 and the fourth electromagnet 34 do not enter the riding rod 3. A magnetic shielding material 35 is provided between the electromagnet 33. The riding rod 3 may also be provided with a magnetic shielding material on the ceiling or floor.

  In the elevator 1 configured as described above, when the riding rod 3 descends exceeding the maximum speed and the riding rod 3 cannot be stopped by the brake of the hoisting machine 6 or the emergency stop device linked to the governor, the speed sensor 31 and the position detection sensor 32, the buffer control device 71 operates the first electromagnet 42 to decelerate the counterweight 4, and operates the third electromagnet 33 and the fourth electromagnet 34. And the vehicle 3 is also decelerated.

  Thus, the elevator 1 of 2nd Embodiment arrange | positions an electromagnet not only on the counterweight 4 side but the riding rod 3 side, and decelerates the riding rod 3. Therefore, as the first permanent magnet 41, the first electromagnet 42, the second electromagnet 43, the third electromagnet 33, and the fourth electromagnet 34, those having a small magnetic force can be adopted, and the apparatus is not bulky.

  The first electromagnet 42, the second electromagnet 43, the third electromagnet 33, and the fourth electromagnet 34 are connected to the secondary battery 72 so as to operate even when electric power cannot be obtained from the outside due to a power failure or the like. The During the normal operation of the elevator 1 as in the first embodiment, the secondary battery 72 has the counterweight 3 approaching the lowest floor and the counterweight 4 is the first electromagnet 42 and the second electromagnet. 1 and when the counterweight 4 moves away from the first electromagnet 42 and the second electromagnet 43 when the carriage 3 moves from the lowest floor to another floor, respectively. Is stored by the induced electromotive force generated between the first electromagnet 42 and the second electromagnet 43. The electric power generated beyond the capacity of the secondary battery 72 is consumed in other parts of the elevator 1. Further, the electric power generated by the first electromagnet 42 and the second electromagnet 43 may be supplied to the third electromagnet 33 and the fourth electromagnet 34 and used for braking the riding board 3 on the lowest floor.

  The third electromagnet 33 and the fourth electromagnet 34 may be arranged at the same pitch in the moving direction of the riding rod 3 or may be arranged at different pitches. The third electromagnet 33 and the fourth electromagnet 34 cause the units 331 and 341 of the units 331 and 341 to be exerted by the buffer control device 71 so that the maximum force is exerted in the direction in which the riding rod 3 is pulled upward according to the position of the riding rod 3. The direction of the current is switched.

  Note that a third permanent magnet may be mounted instead of the third electromagnet 33 mounted on the riding rod 3. In that case, a degaussing coil for canceling the magnetic field of the third permanent magnet is installed. Electric power necessary for the degaussing coil is supplied via a tail cord connected to the carcass 3, and when the carcass 3 is decelerated by the third permanent magnet and the fourth electromagnet 34, the electric power to be passed to the degaussing coil is Cut off.

  The elevator 1 of 3rd Embodiment is demonstrated with reference to FIG. In the elevator shown in FIG. 4, the main rope 5 is wound so as to pass through the lower part of the carriage 3 and is also wound around a pulley 4 </ b> B attached to the upper part of the counterweight 4. Roping to "shape". Accordingly, the end portion 5a of the main rope 5 is fixed to a rope hitch prepared at the upper end of the guide rail 3A for the rod and the upper end of the guide rail 4A for the weight. The structure which has the same function as the elevator 1 of 1st Embodiment attaches | subjects the same code | symbol in FIG. 4, The description of 1st Embodiment is referred for the detailed description.

  In the elevator 1 of the third embodiment, a demagnetizing coil 46 is mounted on the counterweight 4 in order to generate a magnetic field that cancels the magnetic force of the first permanent magnet 41 mounted on the counterweight 4. In this case, the degaussing coil 46 is supplied with electric power via the weight guide rail 4A. A power supply cable is connected to the counterweight 4 in the same manner as the tail cord of the riding rod 3, or power is supplied from the lower portion of the riding rod 3 to the compensating rope connected to the lower portion of the counterweight 4. Electric power may be supplied by adding a supply cable. In addition, when a secondary battery is mounted on the counterweight 4 to supply electric power, it is balanced with a power supply point installed in the hoistway while the elevator 1 is at rest or when the electric power is reduced. The weight 4 is moved to charge the secondary battery.

  When the elevator 1 is in normal operation, the demagnetizing coil 46 is energized to weaken or contain the magnetic force of the first permanent magnet 41. When it is necessary to stop the carriage 3 at the lower part of the hoistway 2, the power of the demagnetizing coil 46 is cut off and the magnetic force of the first permanent magnet 41 is exhibited.

  Further, instead of mounting the first permanent magnet 41 and the demagnetizing coil 46, a ferromagnetic material that is the basis of the first permanent magnet, a magnetizing coil for magnetizing the ferromagnetic material, and instantaneously large electric power are generated. A battery for this purpose may be mounted on the counterweight. Since the ferromagnetic material before being magnetized does not exhibit a magnetic force, it does not attract magnetic powder and fine particles floating in the hoistway. And when it becomes necessary to stop the riding rod 3, the buffer body 71 communicates wirelessly with the counterweight 4, discharges the battery power, and flows the current through the magnetizing coil. Magnetize it into a permanent magnet. As in the case of the first embodiment, the counterweight 3 is also safely stopped by decelerating and stopping the counterweight 4 by the first electromagnet 42.

  Thus, the 1st permanent magnet 41 (or ferromagnetic material) and the 1st electromagnet 42 of 3rd Embodiment are used as the buffering device 8 similarly to 1st Embodiment and 2nd Embodiment. Function. A mechanical shock absorber 8M may be installed on the floor 2A of the hoistway 2 in preparation for the emergency stop of the riding rod 3 at a position lower than the limit position C. In this case, it is only necessary to provide a mechanical shock-absorbing device 8M having a short operation stroke as compared with the case where the riding rod 3 is received only by the mechanical shock-absorbing device. As a result, this elevator 1 can make the pit of the hoistway 2 shallow.

  In addition, what was an electromagnet in each above-mentioned embodiment may be comprised with the ferromagnetic body used as the basis of a permanent magnet, and the magnetizing coil for magnetizing this ferromagnetic body. Ferromagnetic materials do not generate magnetic force when they are not magnetized. Therefore, when initially installed, there is no magnetic field effect around. And when it becomes necessary to stop the riding rod 3 as a shock absorber, an electric current is sent through the magnetizing coil arrange | positioned corresponding to each ferromagnetic material, and a ferromagnetic material is magnetized. By this magnetic force generated, the riding rod 3 and the counterweight 4 are decelerated and stopped.

  Since the electric power for magnetizing the ferromagnetic material may be instantaneous, it is easy to magnetize all the ferromagnetic materials with a small secondary battery even if sufficient power cannot be obtained due to a power failure or the like. . Once magnetized, the ferromagnetic material cancels the magnetic force by passing a current through the magnetizing coil, or is magnetized using the magnetizing coil so that there is no harmful effect on the normal operation of the elevator 1. The body is demagnetized or replaced with a non-magnetized ferromagnetic body when the elevator 1 is restored.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Elevator, 2 ... Hoistway, 2A ... Floor, 3 ... Riding, 4 ... Counterweight, 5 ... Main rope, 6 ... Hoisting machine, 31 ... Speed sensor, 32 ... Position detection sensor, 33 ... 3rd 34 ... fourth electromagnet, 35 ... magnetic shielding material, 41 ... first permanent magnet, 42 ... first electromagnet, 421 ... coil segment, 43 ... second electromagnet, 46 ... demagnetizing coil, 71 ... Buffer control device, 72 ... secondary battery, C ... limit position, 8 ... buffer device (first permanent magnet 41, first electromagnet 42, and second electromagnet 43).

Claims (11)

An elevator in which a main rope is wound around a hoist installed in the upper part of a hoistway, and a riding rod and a counterweight are suspended in a hoistway manner in the hoistway by the main rope,
A first permanent magnet mounted on the counterweight;
In order to stop the boarding safely just before reaching the floor of the hoistway, it is necessary to start deceleration of the boarding on the upper part of the hoistway over a distance corresponding to at least the distance from the limit position to the floor. A first electromagnet disposed to generate a magnetic force in a direction to pull down the first permanent magnet;
An elevator comprising: a second electromagnet installed at an upper end of the hoistway and generating a magnetic force repelling the first permanent magnet. A speed sensor for detecting the moving speed of the norikura;
A position detection sensor for measuring a distance from the floor of the hoistway to the norikura;
A buffer control device that activates the first electromagnet when the limit position is detected by the position detection sensor in a state where the moving speed detected by the speed sensor exceeds the maximum speed set for the riding. The elevator according to claim 1, further comprising: The elevator according to claim 1, wherein the first electromagnet is disposed around a trajectory along which the counterweight moves. The elevator according to claim 1, further comprising a secondary battery that supplies electric power to the first electromagnet and the second electromagnet. When the counterweight moves while the first electromagnet and the second electromagnet are not operated, the first permanent magnet, the first electromagnet, and the second electromagnet move relatively. The elevator according to claim 4, wherein an induced electromotive force generated thereby is stored in the secondary battery. The elevator according to claim 1, wherein the first electromagnet includes a plurality of coil segments, and a coil segment closer to an upper end of the hoistway generates a stronger magnetic force. A third electromagnet mounted on the norikura and generating magnetic force;
A fourth electromagnet installed at least in a range from the limit position to a lower end of the hoistway and generating a magnetic force in a direction of pulling up the third electromagnet upward. The described elevator. The norikura has a magnetic shielding material on the outside of the side wall,
The elevator according to claim 7, wherein the third electromagnet is disposed outside the riding board with the magnetic shielding material interposed therebetween. The counterweight is equipped with a degaussing coil that generates a magnetic field that cancels the magnetic force of the first permanent magnet,
The elevator according to claim 1, wherein the demagnetizing coil is supplied with power via a weight guide rail that guides the counterweight. The elevator according to claim 1, further comprising a shock absorber having a stroke shorter than a stroke required for receiving the riding alone on the floor of the hoistway. The first permanent magnet includes a ferromagnetic material serving as a base, a magnetizing coil for magnetizing the ferromagnetic material, and a battery for causing a current to flow through the magnetizing coil. 2. The elevator according to claim 1, wherein when the motor is stopped, the elevator is made by flowing a current through the magnetizing coil to magnetize the ferromagnetic material.

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