JP5157648B2 - Elevator governor - Google Patents

Description

  The present invention relates to an elevator governor, and more particularly to an improvement in a return mechanism of a governor installed in a hoistway of a machine room-less elevator.

  An example of the configuration of the machine room-less elevator is shown in FIG. In FIG. 5, a drive device 2 is installed in the upper part of the hoistway 1, and a main rope 3 is wound around a sheave 2 a of the drive device 2. A cage is suspended from one end of the main rope 3 and a counterweight 5 is suspended from the other end. In the hoistway 1, a pair of car guide rails 6 and a pair of weight guide rails (not shown) for guiding the raising and lowering of the car 4 and the counterweight 5 are installed. An emergency stop device 7 is provided at the lower part of the car 4 for emergency stopping the car 4 in an emergency. Near the upper end of the car guide rail 6, a governor support member 8 is fixed. On the governor support member 8, an overspeed of the car 4 is detected to operate the emergency stop device 7. The governor 9 is supported.

  A rotatable tension wheel 10 is provided near the bottom of the hoistway 1, and a speed governor rope 11 is wound around the speed governor 9 and the tension wheel 10 in an endless manner. The governor rope 11 is connected to the safety device 7 through a lever 12 and is normally circulated and moved as the car 4 is raised and lowered.

  In such a configuration, when the car 4 is overspeeded, the speed governor 9 operates to restrain the speed governor rope 11 and the emergency stop device 7 operates via the lever 12 connected to the rope. In the roomless elevator, the speed governor 9 is installed in the upper part of the hoistway. Therefore, in order to return the speed governor 9 after the emergency stop device 7 is operated, the car 4 is first slightly raised. Then, the braking state of the emergency stop device 7 on the guide rail 6 is released and the car 4 is moved up to a position where the worker can get on the car from the landing on the top floor. Then, the worker gets on the car, It is conceivable to perform a return operation of the governor 9 by reaching out directly to the governor 9 from above.

  However, there is no problem when the worker can get on the car, but the worker may not get on the car depending on the stop position of the car 4 when the governor 9 is activated. That is, when the stop position of the car is near the top floor, the car 4 must be lowered once after the safety device is released in order for the worker to get on the car, but the safety device 7 can be released. However, if the car 4 is lowered without returning the speed governor 9, the emergency stop device 7 once released can be operated again, so that the car 4 cannot be lowered. Therefore, in such a case, the speed is controlled from above the car. The return work of the machine 9 cannot be performed. Also, from the viewpoint of safety, it is desirable that the worker can perform the return work without entering the tower as much as possible.

  For this reason, pulling the return wire from the governor to the landing and operating this wire from the landing will allow the governor to return from the landing even when the car stops near the top floor. (See, for example, Patent Document 1).

  FIG. 6 is a front view showing the governor of the cited document 1. In the figure, a sheave 21 around which the governor rope 11 is wound is supported by a base 23 so as to be rotatable about a sheave shaft 22. A pair of flyweights 25 that are rotatable around a pin 24 are attached to the side surface of the sheave 21, and the pair of flyweights 25 are connected to each other by a link 26.

  An operating claw 37 is fixed to one end of one flyweight 25, and when the flyweight 25 is rotated by centrifugal force due to the rotation of the sheave 21, the operating claw 37 thereby Displaced radially outward. Between the other end portion of the one flyweight 25 and the sheave 21, a balance spring 27 that opposes the centrifugal force is provided.

  A car stop switch 28 for operating a brake device (not shown) of the drive device 2 is attached to the base 23. The car stop switch 28 is provided with a switch lever 28a operated by an operating claw 37. Have.

  A trip lever 72 is attached to the sheave 21 so as to be rotatable about an axis 71 parallel to the pin 24. A part of the trip lever 72 is in contact with one flyweight 25 and is rotated about the shaft 71 by the rotation of the flyweight 25. The shaft 71 is provided with a torsion spring 73 that urges the trip lever 72 in the direction in which the trip lever 72 is brought into contact with the flyweight 25 (clockwise in the figure).

  The base 23 is provided with a ratchet 30 that can rotate around the sheave shaft 22, and a plurality of teeth are provided on the outer periphery of the ratchet 30. One pin 24 is axially supported by a claw 29 that selectively engages either the trip lever 72 or the ratchet 30. The claw 29 is normally engaged with the trip lever 72 and separated from the ratchet 30, but since it is biased in a direction to engage with the ratchet 30 by the pulling spring 74, the trip is caused by the rotation of the fly weight 25. When the engagement with the lever 72 is released, the lever 72 is rotated by the spring force of the pulling spring 74 and is engaged with the ratchet 30.

  A shoe 32 that is pressed against the governor rope 11 is rotatably attached to an arm 31 that is rotatably attached to the base 23. A spring shaft 33 passes through the spring receiving portion 31 a of the arm 31, and a connection lever 34 is connected between one end of the spring shaft 33 and the ratchet 30. A spring receiving member 35 is provided at the other end of the spring shaft 33, and a rope gripping spring for pressing the shoe 32 against the governor rope 11 between the spring receiving portion 31 a and the spring receiving member 35. 36 is provided.

  A return lever 42 is attached to the base 23 so as to be swingable about a shaft 43 parallel to the sheave shaft 22. The claw 29 is provided with a rotatable protrusion 44 that is pressed when the return lever 42 swings, and the base 23 and the return lever 42 are separated from the protrusion 44. A return spring 45 that biases the return lever 42 is provided.

  The return lever 42 is connected to the distal end portion of the return wire 41. The return wire 41 is inserted into a flexible tube 46 and guided from the landing on the uppermost floor to the governor 9, and the distal end portion of the tube 46 is near the base 23 near the return lever 42. It is fixed to.

  Next, the operation of the governor in the above configuration will be described. When the raising / lowering speed of the car 3 reaches the first overspeed (usually about 1.3 times the rated speed), the operation pawl 37 is moved to the switch lever 28a of the car stop switch 28 by the rotation of the flyweight 25 due to centrifugal force. The switch lever 28a is rotated by contact. As a result, the switch 28 is activated, the power source of the driving device (not shown) is cut off, and the car is stopped by the brake device of the driving device.

  Further, even when the driving device stops, for example, when the main rope 5 is broken, the car 3 continues to descend without stopping, and the descending speed of the car 3 is the second overspeed (usually 1.4 of the rated speed). When the fly weight 25 is further rotated, the amount of rotation of the trip lever 72 is increased accordingly, and the engagement between the trip lever 72 and the claw 29 is released. Thereby, the claw 29 is rotated by the spring force of the tension spring 74 and engages with the teeth of the ratchet 30. Then, the ratchet 30 is slightly rotated together with the sheave 21 in the counterclockwise direction of FIG.

  The rotation of the ratchet 30 causes the arm 31 to rotate counterclockwise in FIG. 6 so that the shoe 32 contacts the governor rope 11 and the shoe 32 is pressed against the governor rope 11 by the rope gripping spring 36. The governor rope 11 is braked. When the governor rope is restrained in this way and the car 4 continues to descend, the lever 12 connected to the governor rope is operated, and the emergency stop device 7 is activated.

  Next, the return work after the operation of the safety device 7 and the governor 9 will be described. In the return operation, first, the car 4 is slightly lifted to release the braking state of the emergency stop device 7 to the car guide rail 6. Thereafter, when the car 4 is further raised, the sheave 21 is rotated in the clockwise direction in FIG. 6 via the governor rope 3 to disengage the claw 29 from the ratchet 30, and the ratchet 30 is also shown in the drawing. Rotate clockwise to return to the original position. As a result, the arm 31 returns to the original position, and the shoe 32 moves away from the governor rope 11.

  Thereafter, when returning from the top of the car, the car 3 is lifted to a position where it can get on the ceiling of the car 3, and then the landing door is opened from the landing on the top floor, and the worker gets on the car 3. . Then, reaching out to the governor 9 from the car 3 and engaging the claw 29 with the trip lever 72, the return operation is completed.

On the other hand, the position of the car 3 when the governor 9 performs the second overspeed operation is in the vicinity of the hall on the top floor, and as described above, the door of the hall can be opened to enter the ceiling of the car 3. Or when it is desired to perform the return operation by remote control from the viewpoint of safety, the door of the landing is opened, the base end of the return wire 41 at the bottom of the sill is taken out to the landing side, and the base end of the return wire 41 Is pulled out of the tube 46. Thereby, on the speed governor 9 side, the return lever 42 is swung in the clockwise direction in FIG. 6 against the return spring 45, and the protrusion 44 is pressed by the return lever 42. Then, the claw 29 is rotated clockwise in FIG. 6 against the tension spring 73 and engages with the trip lever 72.

  By operating in this way, even when the car 3 is in the vicinity of the landing on the top floor and the landing door is opened from that position and it is not possible to get on the ceiling of the car 3, the nail 29 is controlled by remote operation from the landing side. Can be engaged with the trip lever 72.

JP 2002-370879 A

  In the configuration of Patent Document 1, the position of the car 3 when the governor 9 performs the second overspeed operation (operation when the car reaches the second overspeed) is near the top floor landing, and If the return lever 42 and the projection 44 are not in a positional relationship facing each other, it is necessary to first move the return lever 42 to the return position, then raise the car and rotate the sheave 21 clockwise. . At this time, when the positional relationship between the return lever 42 and the protrusion 44 is farthest, it is necessary to rotate the sheave 21 clockwise at most once, but the car is stopped at the top of the hoistway. If there is no ascending allowance for rotating the sheave 21 once, the speed governor 21 cannot be restored as it is.

For this reason, in order to solve this, a plurality of sets of operating means comprising return levers and return wires are provided around the sheave, or an opening is provided on the upper wall surface of the top floor landing, from which workers It is conceivable to perform a return work with a hand.
However, in the former method, the configuration of the governor is very complicated and expensive, and in the latter method, not only construction for making a hole in the wall is required, but also the operator's hand becomes the governor. If it did not arrive, there was a problem that the return work was impossible.

  The present invention has been made in view of the above problems. Even when the position of the car 4 when the governor 9 performs the second overspeed operation is near the landing on the top floor, the car 4 is slightly changed. The purpose of the present invention is to provide an elevator governor that can reliably return the governor 9 from the landing by simply raising it.

  The elevator governor according to the present invention includes a base installed in a hoistway and a governor rope that is rotatably supported by the base and that operates an emergency stop device. , A sheave that rotates according to the raising / lowering speed of the car, a flyweight that is rotatably provided on the sheave, and that is rotated by a centrifugal force generated by the rotation of the sheave, and in a direction against the centrifugal force, A balance spring for urging the flyweight; a ratchet provided around the sheave shaft of the sheave; and having a plurality of teeth on the outer periphery; and provided rotatably on the sheave. A trip lever that is rotated by rotation, and is provided rotatably on the sheave. Normally, the trip is engaged when the lowering speed of the car reaches a preset overspeed when engaged with the trip lever. Engagement with lever A claw for rotating the ratchet in the same direction as the sheave by engaging with the teeth of the ratchet, and a shoe for braking the governor rope when the ratchet rotates in the same direction as the sheave In the elevator speed governor, the release cam fixed to the claw and the sheave shaft of the sheave are provided so as to be rotatable about at least one protrusion at a position facing the release cam. A release ring disposed on a circumference centering on the sheave wheel shaft, and ring restraining means for restraining the release ring by remote control, and restrains the release ring during the return operation of the speed governor. Any one of them comes into contact with the release cam, and the release cam is rotated to engage the claw with the trip lever.

  According to the present invention, the cage can be returned to the return position when any of the plurality of protrusions arranged on the circumference of the release ring comes into contact with the release cam, so that the car stops near the landing on the top floor. Even if it does, even if it raises a cage | basket | car slightly, the return operation | movement of a speed governor can be performed reliably, and also the release mechanism of a speed governor is not complicated compared with the past. Further, since the holding means for holding the return wire as it is during the return work is provided, the return work can be performed by one person, and the return work can be performed more easily and safely.

Embodiment 1 FIG.
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view showing a normal state of the governor according to Embodiment 1 of the present invention. In FIG. 1, the same or equivalent components as those in FIG. 6 are denoted by the same reference numerals. However, in order to avoid complicating the drawing and facilitate understanding, the governor rope 11 and the brake device shown in FIG. The car stop switch 28 for operating the car, the operating claw 37 for operating the car stop switch, the shoe 32 that is pressed against the governor rope and restrains the rope, etc. are similar to those shown in FIG. A part of what is not considered necessary for the description of the mechanism is not shown.

  In FIG. 1, 21 is a sheave supported by a base 23 so as to be rotatable about a sheave shaft 22, and 25 is a pair of pivots attached to a side surface of the sheave 21 around a pin 24. A flyweight 26 is a link that connects the pair of flyweights 25 to each other, 30 is a ratchet that is provided on the base 23 so as to be rotatable about the sheave shaft 22 and has a large number of teeth on the outer periphery, An arm that is pivotally attached to the base 23 and pivotally attaches a shoe that is pressed against the governor rope, 33 is a spring shaft that penetrates the arm 31, and 34 is one end of the spring shaft 33 and a ratchet 30. A connection lever for connecting the spring 35, a spring receiving member provided at the other end of the spring shaft 33, and a rope 36 provided between the arm 31 and the spring receiving member 35 for pressing the shoe against the governor rope. Grab The spring 72 is pivotable about a shaft 71, and is always urged clockwise by a spring (not shown) to maintain engagement with the claw 29, and the flyweight 25 is more than a predetermined value by centrifugal force. The trip lever is configured to be disengaged from the claw 29 when rotated.

  Reference numeral 29 is a claw that is axially supported by the pin 24 and selectively engages with either the trip lever 72 or the ratchet 30. The claw 29 is engaged with the ratchet 30 by a spring (not shown). Normally, it is separated from the ratchet 30 by engagement with the trip lever 72, but when the engagement with the trip lever 72 is released by the rotation of the flyweight due to centrifugal force, the spring force causes Engage with the teeth of the ratchet 30 in a clockwise direction.

  Reference numeral 60 denotes a release ring that can rotate around the sheave shaft 22, and a plurality of protrusions (in this example, 5 pieces) are arranged on the circumference centering on the sheave shaft 22 at a position facing a distal end portion of a later-described release cam. Evenly arranged. Reference numeral 62 denotes a ring restraint device (the governor side) for restraining the release ring 60 when the governor is restored, and is configured to be slidable with respect to the fixed bar 63 fixed to the base 23 and the fixed bar. A restraining bar 64, a fixing bar 63 and a tension spring 65 connecting the restraining bar 64, and one end of the flexible tube 46 is fixed to the end of the fixing bar 63 and is inserted into the tube 46. One end of the return wire 41 is connected to the end of the restraining bar 64. The restraining bar 64 is normally pulled in the right direction in FIG. 1 by the tension spring 65 and does not interfere with the release ring 60.

  Reference numeral 80 denotes a release cam fixed to the upper part of the claw 29, and its tip 80a is U-shaped in cross section and is attached to be rotatable about a shaft 80b with an opening downward (about 30 degrees). The one side extending downward is a position corresponding to the protrusion 61 of the release ring 60. The tip 80a is normally biased counterclockwise in the figure by a tension spring 80c, and the claw 29 holds the engagement with the trip lever 72, so that the release ring 60 is rotated. Also, the projection 61 is not in contact.

  FIG. 2 is a diagram showing a ring restraint device on the landing side according to Embodiment 1 of the present invention. In FIG. 2, 90 is a header for supporting a landing door (not shown) on the top floor, 66 is a ring restraint device (landing side), and is fixed to the base bracket 67 fixed to the header 90 and to the base bracket 67. Sub-bracket 68, a tube 46 led from the governor to the top floor landing, one end of which is fixed to sub-bracket 66, return wire 41 inserted into tube 46, and return wire A slide bracket 69 having one end fixed and configured to be slidable with respect to the base bracket 67, and a butterfly bolt 70 whose end abuts against the base bracket 67 through a screw hole formed in the slide bracket 69. It has become.

  Next, the operation of the governor in the first embodiment will be described. As in the case of the conventional example, when the ascending / descending speed of the car 3 reaches the first overspeed (usually about 1.3 times the rated speed), the operating claw (not shown) is caused by the rotation of the flyweight 25 due to centrifugal force. The switch operates by contacting the switch lever of the car stop switch (not shown), the power source of the driving device (not shown) is cut off, and the car is stopped by the brake device of the driving device.

  Further, for example, when the main rope 5 is broken, even when the driving device is stopped, the car 3 continues to descend without stopping, and the descending speed of the car 3 is the second overspeed (usually about 1.4 times the rated speed). ), The flyweight 25 is further rotated, and the rotation amount of the trip lever 72 is increased accordingly, and the engagement between the trip lever 72 and the claw 29 is released. As a result, the claw 29 is rotated counterclockwise in FIG. 1 by the spring force of the pulling spring (not shown) and engages with the teeth of the ratchet 30. Then, the ratchet 30 together with the sheave 21 is slightly rotated counterclockwise in FIG.

  The rotation of the ratchet 30 causes the arm 31 to rotate counterclockwise in FIG. 1, and a shoe (not shown) attached to the arm 31 comes into contact with a governor rope (not shown) and grips the rope. The shoe is pressed against the governor rope by the spring 36, and the governor rope is braked. When the governor rope is restrained in this way and the car 4 continues to descend, the lever 12 connected to the governor rope is operated, and the emergency stop device 7 operates.

Next, returning work after the operation of the emergency stop device 7 and the governor 9 will be described with reference to FIGS. In FIG. 4, the pair of flyweights 25 and the links 26 are not shown for simplicity.
In the return operation, first, the car 4 is slightly lifted to release the braking state of the emergency stop device 7 to the car guide rail 6. Thereafter, when the car 4 is further raised, the sheave 21 is rotated in the clockwise direction in FIG. 4 via the governor rope 3 to disengage the claw 29 from the ratchet 30, and the ratchet 30 is also shown in the figure. Rotate clockwise to return to the original position. As a result, the arm 31 returns to the original position, and the shoe leaves the governor rope.

  Thereafter, when returning from the top of the car, the car 3 is lifted to a position where it can get on the ceiling of the car 3, and then the landing door is opened from the landing on the top floor, and the worker gets on the car 3. . Then, reaching out to the governor 9 from the car 3 and engaging the claw 29 with the trip lever 72, the return operation is completed.

On the other hand, when the governor 9 performs the second overspeed operation, the position of the car 3 is in the vicinity of the hall on the top floor, and from that position, it is not possible to open the hall door and enter the ceiling of the car 3 or for safety reasons. From this point of view, when it is desired to perform the return operation by remote operation, first, the landing door is opened and the ring restraint device 66 provided at the header portion is operated. That is, as shown in FIG. 3, when the butterfly bolt 70 is rotated and the slide bracket 69 is slid downward in FIG. 3 with respect to the base bracket 67, the return wire 41 fixed to the slide bracket 69 is correspondingly increased. Only pulled downward and held in that state. As a result, as shown in FIG. 4, on the governor side, the restraining bar 64 of the ring restraining device 62 is pulled by the return wire 41 and slides to the left in the figure, and the inclined portion comes into contact with the release ring 60. As a result, the rotation of the release ring 60 is restricted.

  In this state, when the car is lifted little by little and the sheave 21 is rotated in the clockwise direction, the tip end portion 80a of the release cam comes into contact with the protrusion 61 until the sheave 21 rotates at most 1/5. As shown in FIG. 4, the tip 80a is pressed by the protrusion 61 and rotates clockwise by a certain angle about the shaft 80b. Thereafter, as the sheave 21 rotates, the distal end portion 80a is pushed up by the projection 61, whereby the release cam 80 and the claw 29 integrated with the distal end portion 80a are rotated clockwise around the pin 24, and the trip lever 72 Engage with. Thereafter, the engagement between the tip portion 80a and the protrusion 61 is released, and the tip portion 80a returns to the state shown in FIG.

  Here, the reason why the distal end portion 80a of the release cam 80 can be rotated by a certain angle and pulled by the spring 80c is that the distal end portion 80a and the projection 61 collide during the return operation or when the trip lever 72 is operated. It is to relieve the shock that occurs. In particular, when the trip lever 72 is actuated, depending on the position of the protrusion, the distal end portion 80a of the release cam collides with the protrusion 61, and if the reaction causes the release cam 80 and the claw 29 integrated with the release cam to jump up, Since there is a possibility that the timing of engaging with the ratchet 30 may be delayed, the distal end portion of the release cam can be rotated to prevent this.

  As described above, according to the present invention, when the car is near the landing on the top floor and the landing door is opened from that position, it is not possible to get on the ceiling of the car. Even if there is no allowance for raising the car, it is possible to easily and safely return the governor by slightly raising the car by remote control from the landing side.

Other Embodiments In the above embodiment, the number of protrusions on the release ring is five. However, the number of protrusions is not limited to this, and an arbitrary number can be used.
In the above embodiment, the landing side of the ring restraint device is provided in the header portion of the door. However, the present invention is not limited to this. Etc. can also be provided.
In the above embodiment, the release ring is restrained by sliding the restraining bar. However, the present invention is not limited to this, and one end of the restraining bar is pivotally supported, and the one end is pulled upward. Thus, the release ring may be contacted, and various methods can be considered for restraining the release ring.
In addition, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention.

It is a front view which shows the governor in Embodiment 1 of this invention. It is a restraint apparatus operated at the time of return of the governor of FIG. It is a figure which shows the state at the time of return operation in the restraint apparatus of FIG. It is a figure for demonstrating the return operation | movement of the governor of FIG. It is a figure which shows an example of a structure of a machine room less elevator. It is a front view which shows an example of the conventional governor.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hoistway 4 Car 7 Emergency stop device 9 Speed governor 11 Speed governor rope 21 Sheave 22 Sheave axle 23 Base 25 Flyweight 29 Claw 30 Ratchet 41 Return wire 60 Release ring 61 Protrusion 62 Ring restraint device (Speed governor) Machine side)
64 Bar for restraint 66 Ring restraint device (on the landing side)
67 Base bracket 68 Slide bracket 70 Butterfly bolt 72 Trip lever 80 Release cam 80a Tip

Claims (4)

A base installed in the hoistway, and a rope that is rotatably supported by the base and is wound around a speed governor rope for operating the emergency stop device, and rotates according to the raising / lowering speed of the car. A flyweight that is rotatably provided on the sheave and rotated by a centrifugal force caused by the rotation of the sheave; a balance spring that biases the flyweight in a direction against the centrifugal force; A ratchet that is rotatably provided around the sheave shaft of the sheave and has a large number of teeth on the outer periphery, a trip lever that is rotatably provided on the sheave and rotated by the rotation of the flyweight; The sheave is rotatably provided, and normally engages with the trip lever, and when the lowering speed of the car reaches a preset overspeed, the engagement with the trip lever is released and the ratchet Engaging teeth Thus, a speed governor for an elevator comprising a pawl for rotating the ratchet in the same direction as the sheave and a shoe for braking the speed governor rope when the ratchet rotates in the same direction as the sheave And a release cam fixed to the claw, and a sheave shaft provided around the sheave shaft of the sheave, and at least one protrusion on the circumference centering on the sheave shaft at a position facing the release cam. And a ring restraining means for restraining the release ring by remote control. When the governor is restored, the release ring is restrained and any one of the protrusions comes into contact with the release cam. Accordingly, the speed governor for an elevator is characterized in that the release cam is rotated to engage the pawl with the trip lever. The speed governor for an elevator according to claim 1, wherein a tip end portion of the release cam that comes into contact with the protrusion is rotatable. The ring restraining means includes a restraining bar that is displaceable between a normal position and a restraining position that restrains the release ring, one end connected to the restraining bar, and the other end pulled to a position where it can be operated from the landing. The elevator governor according to claim 1 or 2, further comprising a returned return wire. The elevator governor according to claim 3, further comprising a holding unit capable of holding the restraining bar at a restraining position at an end of the return wire on the landing side.

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