JP5345183B2 - Elevator emergency stop device - Google Patents

Abstract

The invention provides an emergency braking device of an elevator. When the elevator emergency state occurs during a running period, the elevator generates a braking force within a time as short as possible, and enables actuator not to release the braking to the elevator car at a large capacity. When a first braking component and a second braking component carry out a compression clamping emergency braking on a guide rail to release the emergency braking, the second cam-shaped braking component is in leakage with the rising movement of the operated elevator car, so that the second braking component is abutted against the guide rail and rotates simultaneously, and accordingly, the interval between an electromagnetic winding of the actuator arranged at the other end side of an arm part and a column plug is shortened; when the emergency is released, the electrified actuator acts during the stage after the interval is shortened, so that the cam-shaped second braking component is separated from the guide rail; namely, when the braking is released, a cam is rotated by utilizing the energy of lifting the elevator car, and the actuator can return to the position close to the normal state, so that the capacity for recovering the needed actuator can be shortened.

Description

  The present invention relates to an emergency stop device for an elevator, and more particularly to a technology for reducing the capacity of an actuator required for returning from an emergency to a normal time in the emergency stop device.

  As disclosed in, for example, Patent Document 1 and Patent Document 2, an emergency stop device that is electrically operated when the descending speed of the car exceeds a specified value has already been proposed.

  The emergency stop device disclosed in Patent Document 1 includes a braking force generation device that stops the lowering of the car by narrowing the guide rail with a braking member, and a braking force when the lowering speed of the car exceeds a specified value. And an actuating mechanism for actuating a braking member of the generator.

  In the emergency stop device disclosed in Patent Document 2, a wedge-shaped braking member and a wedge surface disposed on the guide rail side are released by an urging force of a first spring by releasing an electromagnetic magnet during emergency braking of a car. A mounting portion composed of a guide device having a guide is pressed against the guide rail. As a result, a frictional force is generated to drag the braking member with respect to the guide rail in the elevator movement direction, and this frictional force is inserted between the guide rail and the guide device.

  Further, in Patent Document 2, the braking member moves along the wedge surface, thereby overcoming the biasing force of the first spring, and the distance between the guide device and the guide rail is widened. When the guide device moves to the position before the release of the electromagnetic magnet, the electromagnetic magnet also returns to the state before the release. This prevents the first spring from being compressed any further. Further, when the braking member moves along the wedge surface, the second spring disposed between the electromagnetic magnet and the guide device is compressed, and a large frictional force is generated between the guide rail and the braking member, thereby causing the car to move. Is to brake. During normal operation, an actuator such as an electromagnetic magnet is used because the spring that operates the mount must be compressed.

Japanese Patent No. 4478704 JP 2008-143706 A

  In the emergency stop device disclosed in Patent Document 1 described above, when the operating mechanism device is returned to the normal state, a temporarily large suction force is required to overcome the spring strength required to narrow the braking member. Yes, since the capacity of the actuator is determined by the suction force at this time, the capacity of the actuator is increased.

  In the emergency stop device disclosed in Patent Document 2, the actuator capacity may be smaller than that of the method of Patent Document 1, but since a large frictional force is generated after the actuator is returned to the normal state, the background art described above is used. The procedure described in the column must be followed, and it takes longer to generate the braking force than the method of the above-mentioned Patent Document 1.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an elevator apparatus having an emergency stop device that can shorten the time until braking force is generated as much as possible during emergency operation of the elevator and can release the braking of the car without increasing the capacity of the actuator. Is to provide.

In order to solve the above problems, the present invention mainly adopts the following configuration.
A car that is guided up and down by a guide rail standing on a hoistway, a counterweight connected to the car via a main rope, a hoisting machine that drives the main rope, and the car In an elevator equipped with an emergency stop device that is installed and provides braking force to the car,
The emergency stop device has a first body portion fixed to the car, and a second body portion that is vertically displaceable on a vertical axis supported by the first body portion,
The second body portion includes a wedge-shaped first braking member that clamps the guide rail, a pair of arm portions that are rotatably supported around the longitudinal axis, and a pair of arm portions. A cam-shaped second braking member that clamps the guide rail on one end side, and an actuator that is attached to the other end side of the pair of arm portions and separates the second braking member from the guide rail,
When the emergency braking is released from the emergency braking in which the first braking member and the second braking member narrow the guide rail, the second braking member of the second braking member is interlocked with the upward movement of the car by the operation. As the cam shape rotates while contacting the guide rail, the distance between the electromagnetic coil and the plunger of the actuator attached to the other end of the arm portion is reduced, and the actuator that starts energizing when the emergency braking is released The cam-shaped second braking member is separated from the guide rail by operating at the stage where the interval is reduced.
With this configuration, it is possible to return the actuator to a position close to the normal state by rotating the cam using the energy for pulling up the car at the time of braking release, so that the actuator capacity required for the return can be reduced.

  According to the present invention, it is possible to generate a braking force quickly in an emergency operation of the elevator, and to return to a normal state by operating a small capacity actuator when releasing the brake.

It is a figure which shows the outline | summary of the machine room less elevator provided with the emergency stop apparatus of the elevator which concerns on embodiment of this invention. It is a whole perspective view of the safety device concerning this embodiment. It is a whole perspective view of the action | operation mechanism apparatus in the emergency stop apparatus shown in FIG. It is a front view of the safety device shown in FIG. 2, and is a diagram showing different operation modes of the safety device. It is a top view showing the different operation | movement aspect of the arm part and actuator in the emergency stop apparatus shown in FIG. It is a front view which shows the other structural example of the emergency stop apparatus which concerns on this embodiment.

  An elevator safety device according to an embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1, 1 is a hoistway, 2A and 2B are guide rails, 3 is a passenger car, 4 is a counterweight, 5 is a hoisting machine, 6 is a brake, 7 is a main rope, 8A and 8B are emergency stop devices, 9 Represents a control panel and 10 represents an encoder. FIG. 1 shows an outline of a general machine room-less elevator. A pair of guide rails 2A and 2B is installed in the hoistway 1, and a car 3 and a counterweight 4 which are guided by the guide rails 2A and 2B and go up and down are wound around a hoisting machine 5 and a main rope 7 Connected with. By driving the main rope 7, the car 3 and the counterweight 4 are raised and lowered. The counterweight 4 also has a guide rail (not shown).

  A brake 6 is attached to the hoisting machine 5. When the hoisting machine 5 is operating, the brake 6 is energized to remove the braking force, and when the hoisting machine 5 is stopped, the brake 6 is turned off to cut off the electric power, thereby breaking the brake spring (not shown) and the shoe. A braking force is applied to the hoisting machine 5 (not shown). In the vicinity of the hoisting machine 5, a control panel 9 for controlling the entire elevator apparatus is arranged. The control panel 9 also functions as an emergency stop device control panel. The emergency stop device control panel may be provided separately from the control panel 9. At the lower part of the car 3, emergency stop devices 8A and 8B are arranged so as to face the guide rails 2A and 2B. The hoisting machine 5 is provided with an encoder 10, and signals from the encoder 10 are used to control the speed and position of the car.

  In FIG. 2, 2S is a wide surface of the guide rail 2, 11 is a first body portion, 16A, 16B, 16C and 16D are fixed shafts, 17A and 17B are wedges, 18 and 19 are wedge guide members, and 20 is a seat. , 21 represents a second body part, respectively. FIG. 2 is an overall configuration diagram of the safety devices 8A and 8B according to the present embodiment.

  As shown in FIG. 2, the safety devices 8 </ b> A and 8 </ b> B have a first body portion 11 that is fixed to the car 3 and forms a support. The first body portion 11 includes an upper frame 11A, a lower frame 11B, and left and right side frames 11C and 11D. Guide members 18 and 19 are provided at positions facing the wide surfaces 2S of the guide rails 2A and 2B on the inner upper sides of the left and right side frames 11C and 11D. Referring also to FIG. 4, the guide members 18 and 19 include members 18 a and 19 a that form tapered surfaces by disposing the gap with the wide surface 2 </ b> S so that the upper side is narrower and the lower side is wider. It has a structure having guide plates 18b, 18c (not shown), 19b, 19c (not shown) that restrain the horizontal movement of 17A, 17B.

  The guide members 18 and 19 have a braking surface perpendicular to the side facing the wide surface 2S of the guide rails 2A and 2B at a position facing the guide rails 2A and 2B inside the tapered surfaces of the guide members 18 and 19, and the guide member Wedges 17A and 17B, which are first braking members having a reverse taper surface, are located on the side facing the taper surfaces 18 and 19, respectively. The wedges 17A and 17B are guided by guide members 18 and 19 so as to be movable in the vertical direction.

  3 and 4, the wedges 17A and 17B are secured at a position below the guide members 18 and 19 with a sufficient clearance between the guide rails 2A and 2B and the wide surface 2S. Yes, when the elevator is in an emergency, the guide rails 2A and 2B move in the horizontal direction along the tapered surface while moving relatively upward with respect to the first body portion 11, and the guide rails 2A and 2B are wide. A braking force is generated in contact with the surface 2S. A seat 20 is provided under the wedges 17A and 17B. Under the receiving seat 20, there is a second body portion 21 to which the operation mechanism device of the emergency stop devices 8A and 8B is attached.

  In FIG. 3, 13A and 13B are stopper guide pins, 22 is a shaft fixed to the first body portion, 23 is an arm portion, 24 is a cam-shaped shoe, 25 is a shoe rotation shaft, 27 is a guide pin of a spring 28, Reference numeral 28 denotes a spring, and 29B denotes a plunger. FIG. 3 shows an overall view of the operation mechanism device of the emergency stop devices 8A and 8B. As shown in FIG. 3, the operating mechanism device is attached to the second body portion 21, and the second body portion 21 is also composed of an upper frame 21A, a lower frame 21B, and left and right side frames 21C and 21D. The second body portion 21 is linked by a shaft 22 fixed to the inside of the first body portion 11, and is configured to move upward along the shaft 22.

  Referring to FIG. 5 as well, one end side of each of the arm portions 23A and 23B extends from the shaft 22 to a position facing the wide surface 2S of the guide rails 2A and 2B. Cam-shaped shoes 24A and 24B, which are members, are attached. The shoes 24A and 24B can rotate in an arbitrary range around the shoe rotation shafts 25A and 25B, and the peripheral surface of the shoe 24 has a cam shape having a different diameter from the shoe rotation shafts 25A and 25B. That is, the rotating shaft 25 and the center of gravity are different cam shapes. A receiving seat 20 is provided on the upper frame 21A constituting the second body portion 21, and inside the receiving seat 20, wedges 17A and 17B are respectively guided by the guide members 18 and 19 shown in FIGS. Guide grooves (not shown) for the stopper guide pins 13A and 13B are provided so that they can be displaced in the horizontal direction along the taper surface.

  In FIG. 4, 2 is a guide rail, 12 is a first elastic member, 11 is a first body part, 21 is a second body part, 20 is a receiving base for a wedge 17, 23 is an arm part, and 24 is a cam shape. Each shoe represents.

  FIG. 4 is a schematic view of the emergency stop devices 8A and 8B as viewed from the front. FIG. 4A shows a state in which the arm portions 23A and 23B are operated from the normal state (see also FIG. 5). First elastic members 12A and 12B are connected to the side frames 11C and 11D of the first body portion 11 at one end and to the guide members 18 and 19 at the other end on the upper portion of the first body portion 11. ing. The guide members 18 and 19 are fitted to the fixed shafts 16A, 16B, 16C, and 16D with play.

  FIG. 4B shows a state in which the wedges 17A and 17B are bitten along the tapered surface from the state of FIG. In an emergency shown in FIG. 4B, the cam-shaped outer peripheral surface of the shoe 24 is in contact with the guide rail 2. The cam outer peripheral surface in this state is not a circular arc shape but a linear shape so as to be in surface contact with the contact surface of the guide rail, and the braking effect is enhanced.

  FIG. 4C shows a state in which the car 3 and the first body portion 11 connected to the car 3 are lifted to release the emergency stop devices 8A and 8B from the state of FIG. 4B. . As shown in FIG. 4C, the second body portion 21 is moved downward relative to the first body portion 11 from the position where the wedges 17A and 17B are bitten (the state shown in FIG. 4B). It moves and the fixed state of the car is released (the wedge is released). Here, when the car 3 and the first body portion 11 fixed thereto are forcibly raised to a certain extent in order to release the emergency stop device 8 from the bitten state shown in FIG. The two body parts 21 are also raised in conjunction with each other, and the shoes 24A and 24B rotate in sliding contact with the wide surfaces 2S of the guide rails 2A and 2B due to the cam shape of the peripheral surfaces of the shoes 24A and 24B. The shoes 24A and 24B are designed such that the distance between the guide rails 2A and 2B and the shoe rotation shafts 25A and 25B increases when the first body portion 11 is rotated in the direction of pulling up.

  In FIG. 5, reference numeral 23 denotes an arm portion that rotates with the shaft 2 as a fulcrum, 24 denotes a cam-shaped shoe, 28 denotes a compression spring (a spring that is compressed in the normal operation of the elevator), 29 denotes an actuator portion, 29A represents an electromagnetic coil of the actuator unit, 29B represents a plunger of the actuator unit, and 29C represents a plunger guide of the actuator unit. FIG. 5 is a top view illustrating different operation modes of the arm portion in the safety device of FIG. 2.

  FIG. 5A shows a state in which the power of the actuator unit 29 is cut off and the shoes 24A and 24B are in contact with the guide rails 2A and 2B, and corresponds to FIG. FIG. 5B shows a state in which the shoes 24A and 24B rotate and the distance between the guide rails 2A and 2B and the shoe rotation shafts 25A and 25B is widened, and corresponds to FIG. The other end side of the shoes 24A, 24B in the arm portions 23A, 23B extends from the shaft 22 to the opposite side of the guide rails 2A, 2B, and an operating mechanism is provided at the extended end portion.

  The operating mechanism includes a compression spring 28 serving as a second elastic member fitted with a play on a spring guide pin 27 provided across the arm portions 23A and 23B, and an actuator portion 29. The actuator unit 29 includes an electromagnetic coil 29A fixed to the arm unit 23B, and a plunger 29B connected to the arm unit 23A via a plunger guide 29C and penetrating the electromagnetic coil 29A and the arm unit 23B.

  When the electromagnetic coil 29A is excited, the compression spring 28 is compressed and the plunger 29B is attracted to the electromagnetic coil 29A as indicated by the arrow B shown in FIG. The distance between the end portions (spring 28 side) is narrowed, thereby widening the tip end portion (shoe 24 side) and disengaging the shoes 24A and 24B from both sides of the wide surface 2S of the guide rails 2A and 2B. When the shoes 24A and 24B are disengaged from the guide rails 2A and 2B, the shoes 24A and 24B are returned to their normal positions by rotation springs (not shown) connected to the shoe rotation shafts 25A and 25B. The positions of the centers of gravity of the shoes 24A and 24B may be adjusted to return to the normal state by their own weight. The return of the shoe 24 to the normal position when the shoe 24 is separated from the guide rail 2 may be the rotation spring provided on the shoe as described above, and the adjustment of the position of the center of gravity existing at a position different from the rotation shaft 25. Alternatively, the rotary spring and the center of gravity position may be used in combination.

  Further, as shown in FIG. 5, after the shoes 24A and 24B are rotated by contact with the guide rail 2, the distance between the electromagnetic coil 29A and the plunger 29B is shortened. Thus, when disengaging the shoes 24A, 24B from the guide rails 2A, 2B, the energy required for the electromagnetic coil 29A to attract the plunger 29B can be reduced.

  Next, the emergency braking operation in the downward movement of the elevator will be described for the emergency stop device according to the present embodiment. The elevator apparatus including the emergency stop devices 8A and 8B having the above-described configuration performs normal operation when the speed information of the car 3 detected by the sensor is not determined to be abnormal by the control panel 9. In the normal state of the elevator apparatus, as shown in FIG. 5 (b), the electromagnetic coil 29A of the actuator unit 29 is excited to attract the plunger 29B, thereby compressing the compression spring 28. As a result, the arm unit 23A, Since the tip end portion (the shoe 24 side) of 23B spreads, the shoes 24A and 24B are dissociated from both sides of the wide surface 2S of the guide rails 2A and 2B. As shown in FIG. 2, the second body portion 21 is in the lower position due to its own weight, and the wedges 17A and 17B supported by the second body portion 21 are also guided to the lower positions of the guide members 18 and 19, and the guide rails 2A and 2B It dissociates from both sides of the wide surface 2S.

  On the other hand, when the speed information of the car 3 detected by the sensor is determined to be abnormal by the control unit when the car is descending, the excitation of the electromagnetic coil 29A of the actuator unit 29 is canceled by a command from the control unit. Is turned off. When the excitation of the electromagnetic coil 29A is released, the compression spring 28 is opened as shown in FIGS. 4 (a) and 5 (a), and the arm portions 23A and 23B are moved in the direction of arrow A in FIG. 5 (a). The end (spring 28 side) is pushed wide and the tip is narrowed. Therefore, the shoes 24A and 24B are displaced in the direction of the arrow C in FIG. 2 to narrow the guide rails 2A and 2B, and the arm portions 23A and 23B and the second body portion 21 are moved as the car continues to descend. The speed is reduced, and the distance between the first body portion 11 and the second body portion 21 is relatively reduced.

  As a result, as shown in FIG. 4B, the second body portion 21 is displaced upward relative to the first body portion 11 along the shaft 22, and is placed on the second body portion 21. The wedges 17 </ b> A and 17 </ b> B are displaced relative to the first body portion 11 along the guide members 18 and 19. When the wedges 17A and 17B are displaced upward, the wedges 17A and 17B are displaced in the direction of the arrow D in FIG. 3 along the tapered surface provided in the first body portion 11, and are pressed against the wide surface 2S of the guide rails 2A and 2B. 1 is fixed to the guide rails 2A and 2B, and as a result, the lowering of the car 3 is stopped.

  Here, a structure for reliably holding the emergency state shown in FIG. 4B will be described. A non-illustrated rotation stop (projection as a stopper) is provided at the tip (shoe side) of the arm 23. On the other hand, a flat surface connecting substantially circular arcs is formed in the cam shape on the outer peripheral surface of the shoe 24. This flat surface is used as a rotation stop receiving surface corresponding to the rotation stop. In an emergency when the elevator is descending, the shoe 24 moves in a downward direction while rotating in contact with the guide rail 2 by turning off the energization of the electromagnetic coil, but the arm portion prevents the shoe 24 from rotating in the state of FIG. The rotation stop contacts the rotation stop receiving surface (flat surface) of the shoe 24 and reliably holds the braking function as the second braking member together with the wedge 17 of the first braking member.

  As described above, when the car 3 is abnormally lowered, the actuator parts 29 arranged on the arm parts 23A and 23B are operated with the power cut off, thereby driving the wedges 17A and 17B to generate a braking force. Is configured to stop the descent of the vehicle. As described above, when an abnormality occurs, the braking force can be quickly generated by the power supply interruption of the actuator unit 29 and the wedge coupling by the pinching action of the wedge 17 when the car descends.

  Next, the release operation of the safety device according to this embodiment, that is, the release operation of the fixed car 3 will be described. In order to release the wedge coupling to release the emergency stopped car 3, the hoisting machine 5 is driven by the control panel 9, the car 3 is raised, and at the same time, the electromagnetic coil 29A is excited (energization is started). As the car 3 is raised, the first body portion 11 is also raised. In other words, as shown in FIG. 4C, the wedges 17A and 17B move downward relative to the first body portion 11. Then, it moves in the direction of arrow E in FIG. 3 along the tapered portion of the first body portion 11. Thereby, the pressing force applied to the rail wide surface 2S is unloaded. During this operation, the shoes 24A, 24B rotate in the direction of the arrow shown in FIG. 4C by abutting the guide rails 2A, 2B by the eccentric cam shape, and the guide rails 2A, 2B and the shoe rotation shaft 25A are rotated. , 25B is widened, and the distance between the electromagnetic coil 29A and the plunger 29B is narrowed (state shown in FIG. 5B).

  When the distance between the electromagnetic coil 29A and the plunger 29B approaches, the electromagnetic coil 29A and the plunger 29B that have been excited immediately before are attracted. Due to the displacement of the plunger 29B due to this adsorption, the shoes 24A, 24B are dissociated from the guide rails 2A, 2B, the second body portion 21 is moved to the lowest position by its own weight, and the wedges 17A, 17B supported thereby are also very Guided to the lowermost position of the guide members 18 and 19 of the stoppers 8A and 8B, the guide members 2A and 2B are separated from both sides of the wide surface 2S.

  As described above, when the emergency stop device is released, the initial displacement of the plunger 29B is a mechanical movement due to the eccentricity of the shoes 24A and 24B rotating in contact with the guide rail 2A. 29B approaches the electromagnetic coil 29A and is attracted by the electromagnetic force. Therefore, it is possible to reduce the capacity of the actuator unit 29 for releasing the emergency stop.

  Next, another configuration example of the safety devices 8A and 8B according to the present embodiment will be described below with reference to FIG. Fig.6 (a) shows the operation | movement aspect of the emergency stop apparatus 8 in the normal state of elevator operation. As shown in FIG. 6A, the safety devices 8A and 8B have a first body portion 11 that is fixed to the car 3 and forms a support. The first body portion 11 includes an upper frame 11A, a lower frame 11B, and left and right side frames 11C and 11D. Guide members 18 and 19 are provided at positions facing the wide surfaces 2S of the guide rails 2A and 2B on the inner upper sides of the left and right side frames 11C and 11D. The guide members 18 and 19 have members 18a and 19a that form tapered surfaces by arranging the gap with the wide surface 2S so that the upper side is narrower and the lower side is wider, and the wedges 17A and 17B are moved in the horizontal direction. It has a structure having guide plates 18b, 18c (not shown), 19b, 19c (not shown) for restraining.

  First elastic members 12A and 12B are connected to the side frames 11C and 11D of the first body part at the upper part of the first body part 11 and to the guide members 18 and 19 at the other end. Yes. The guide members 18 and 19 are fitted to the fixed shafts 16A, 16B, 16C, and 16D with play. The guide members 18 and 19 have a braking surface perpendicular to the side facing the wide surface 2S of the guide rails 2A and 2B at a position facing the guide rails 2A and 2B inside the tapered surfaces of the guide members 18 and 19, and the guide member Wedges 17A and 17B, which are first braking members having a reverse taper surface, are located on the side facing the taper surfaces 18 and 19, respectively. The wedges 17A and 17B are guided by guide members 18 and 19 so as to be movable in the vertical direction.

  The wedges 17A and 17B are located below the guide members 18 and 19 with a sufficient clearance between the wedge rails 17A and 17B and the wide surfaces 2S of the guide rails 2A and 2B. Along the taper surface 19, it moves horizontally toward the guide rails 2 </ b> A, 2 </ b> B while displacing upward relative to the first body portion 11, and contacts the wide surface 2 </ b> S of the guide rails 2 </ b> A, 2 </ b> B. To generate braking force. A seat 20 is provided under the wedges 17A and 17B.

  Inside the seat 20, there are guide pins (not shown) so that the wedges 17A and 17B can be displaced horizontally along the tapered surfaces of the guide members 18 and 19 shown in FIG. The guide groove (not shown) is provided. The receiving seat 20 is connected to the operation mechanism device of the emergency stop devices 8A and 8B by a pulling bar 30.

  The operating mechanism device has a second body portion 21 as shown in FIG. The second body portion 21 is provided with an arm portion 23 that rotates about a shaft 22 that is disposed in a direction perpendicular to the narrow surfaces of the guide rails 2A and 2B. A tension spring 28 serving as a second elastic member is connected to one side of the arm portion 23. The other side of the arm portion 23 is provided with a shoe 24 as a second braking member, and an actuator portion 29 at the end.

  The shoe 24 can rotate in an arbitrary range around the shoe rotation shaft 25. The actuator unit 29 includes an electromagnetic coil 29A fixed to the second body unit 21, and a plunger 29B connected to the arm unit 23 via a plunger guide 29C and penetrating the electromagnetic coil 29A and the arm unit 23B. ing. A fixed shoe 26 is disposed on the opposite side of the surfaces of the guide rails 2A and 2B with which the shoe 24 abuts. In the configuration example shown in FIG. 6, the arm portion 23, the spring 28, the shoe 24, and the actuator portion 29 are provided only on one side, but may be provided on both sides.

  FIG. 6B shows a state in which the arm portion 23 is operated by cutting off the energization of the electromagnetic coil 29A from the state of FIG. 6A, and the wedges 17A and 17B are bitten along the tapered surface.

  FIG. 6C is a state in which the first body portion 11 is lifted from the state of FIG. 6B in order to release the emergency stop devices 8A and 8B. As shown in FIG. 6C, the second body portion 21 is moved downward relative to the first body portion 11 from the position where the wedges 17A and 17B are bitten (the state in FIG. 6B). It moves and the fixed state of the car is released. Further, when the car 3 and the first body portion 11 fixed to the car 3 are forcibly raised to some extent in order to release the emergency stop device 8 from the bitten state shown in FIG. The body portion 21 also rises in conjunction with each other, and the shoes 24A and 24B rotate in sliding contact with the guide rails 2A and 2B by the cam shape of the peripheral surfaces of the shoes 24A and 24B. The shoes 24A and 24B are designed such that the distance between the guide rails 2A and 2B and the shoe rotation shafts 25A and 25B increases when the first body portion 11 is rotated in the direction of pulling up.

  When the electromagnetic coil 29A is excited, the tension spring 28 is pulled and the plunger 29B is attracted to the electromagnetic coil 29A as shown by the arrow F in FIG. 6C, so that the pad 24 is attached to the guide rails 2A and 2B. Dissociate from wide surface.

  When the shoes 24A, 24B are disengaged from the guide rails 2A, 2B, the shoes 24A, 24B are returned to their normal positions by a rotation spring (not shown) connected to the cam rotation shaft 25. The position of the center of gravity of the shoe (having a cam shape) may be adjusted to return to the normal state by its own weight. Further, as shown in FIG. 6C, the distance between the electromagnetic coil 29A and the plunger 29B is shortened after the shoe 24 is rotated. Thereby, when the shoe 24 is dissociated from the guide rails 2A and 2B, the energy required for the electromagnetic coil 29A to attract the plunger 29B can be reduced.

  In the configuration example of the emergency stop device shown in FIG. 6, the emergency braking operation in the lower direction of the elevator and the release operation of the car 3 are the same as the operations in the configuration examples shown in FIGS. Therefore, description of the structural example shown in FIG.4 and FIG.5 is used. In addition, when the emergency stop device is released, the initial displacement of the plunger 29B is a mechanical movement due to the eccentricity of the shoe 24A rotating in contact with the guide rail 2A, and the plunger 29B after the mechanical movement is electromagnetically moved. It approaches the coil 29A and is attracted by its electromagnetic force. Therefore, it is possible to reduce the capacity of the actuator unit 29 for releasing the emergency stop.

  As described above, according to the embodiment of the present invention, the braking force generation device that stops the lowering of the car by pressing the guide rail with the braking member, and the braking force is generated when the lowering speed of the car exceeds a specified value. And an actuating mechanism device that operates the braking member of the device, and has a structure in which the braking member of the braking force generating device has a cam shape that can rotate within an arbitrary range. With this configuration, the time until the braking force is generated is as short as possible during braking, and when releasing the brake, the cam-shaped shoe is rotated by using the energy to pull up the car and the actuator is in the normal state. Can be returned to a position close to, and as a result, the capacity of the actuator required for the return can be reduced.

DESCRIPTION OF SYMBOLS 1 Hoistway 2A, 2B Guide rail 3 Car 4 Balance weight 5 Hoisting machine 6 Brake 7 Main rope 8A, 8B Emergency stop device 9 Control panel 10 Encoder 11 1st body part 12 1st elastic member 13A, 13B Stopper Guide pin 16A, 16B, 16C, 16D Fixed shaft 17A, 17B Wedge 18, 19 Wedge guide member 20 Seat 21 Second body portion 22 Shaft 23 Arm portion 24 Cam-shaped shoe 25 Shoe rotation shaft 26 Fixed shoe 27 Spring guide Pin 28 Spring 29 Actuator section 29A Electromagnetic coil 29B Plunger 29C Plunger guide 30 Lifting rod

Claims (6)

A car that is guided up and down by a guide rail standing on a hoistway, a counterweight connected to the car via a main rope, a hoisting machine that drives the main rope, and the car In an elevator equipped with an emergency stop device that is installed and provides braking force to the car,
The emergency stop device has a first body portion fixed to the car, and a second body portion that is vertically displaceable on a vertical axis supported by the first body portion,
The second body portion includes a wedge-shaped first braking member that clamps the guide rail, a pair of arm portions that are rotatably supported around the longitudinal axis, and a pair of arm portions. A cam-shaped second braking member that clamps the guide rail on one end side, and an actuator that is attached to the other end side of the pair of arm portions and separates the second braking member from the guide rail,
When the emergency braking is released from the emergency braking in which the first braking member and the second braking member narrow the guide rail, the second braking member of the second braking member is interlocked with the upward movement of the car by the operation. As the cam shape rotates while contacting the guide rail, the distance between the electromagnetic coil and the plunger of the actuator attached to the other end of the arm portion is reduced, and the actuator that starts energizing when the emergency braking is released An elevator emergency stop device that operates at the stage where the interval is reduced to separate the cam-shaped second braking member from the guide rail . A car that is guided up and down by a guide rail standing on a hoistway, a counterweight connected to the car via a main rope, a hoisting machine that drives the main rope, and the car In an elevator equipped with an emergency stop device that is installed and provides braking force to the car,
The emergency stop device has a first body portion fixed to the car, and a second body portion that can be displaced in the vertical direction with respect to the first body portion,
The second body portion includes a wedge-shaped first braking member that clamps the guide rail, an arm portion that pivots about an axis on a side of the guide rail, and the arm portion that includes the guide rail. A cam-shaped second braking member that clamps with a fixed shoe, a lifting member connected to a receiving seat of the first braking member, the arm portion connected to the lifting member, and the fixed shoe An installation plate portion, a spring provided on one end side of the arm portion and pressing the second braking member against the guide rail, and a second braking member attached to the other end side of the arm portion from the guide rail. An actuator for dissociation, and
When the emergency braking is released from the emergency braking in which the first braking member and the second braking member narrow the guide rail, the second braking member of the second braking member is interlocked with the upward movement of the car by the operation. As the cam shape rotates while contacting the guide rail, the distance between the electromagnetic coil and the plunger of the actuator attached to the other end of the arm portion is reduced, and the actuator that starts energizing when the emergency braking is released An elevator emergency stop device that operates at the stage where the interval is reduced to separate the cam-shaped second braking member from the guide rail . In claim 1 or 2,
The second braking member performs the emergency braking release, and when the cam shape of the second braking member rotates while abutting against the guide rail, An emergency stop device for an elevator, characterized by having a cam shape in which a distance between a braking member and the guide rail is increased. In claim 1, 2 or 3,
The arm portion is provided with a rotation stopper within the rotation region of the cam-shaped second braking member,
At the time of emergency braking when the elevator is lowered, the outer peripheral surface of the second braking member is arranged so that the cam-shaped second braking member does not rotate beyond a predetermined rotation range due to contact with the guide rail. An elevator emergency stop device comprising a rotation stop receiving surface corresponding to the rotation stop. In any one of claims 1 to 4,
The cam-shaped second braking member is formed on the opposite side of the guide rail side with respect to the rotation center of the second braking member by the operation of the actuator. An emergency stop device for an elevator, wherein when the two braking members are separated from the guide rail , the second braking member is automatically returned to the normal position. In any one of claims 1 to 4,
A spring for providing rotation to the rotation center of the cam-shaped second braking member;
When the second brake member having the cam shape is separated from the guide rail by the operation of the actuator, the second brake member is automatically returned to the normal position by the spring. Emergency stop device.

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