JPWO2011027432A1 - Elevator equipment - Google Patents

Abstract

In the hoistway, a car position detection device having a position switch capable of detecting an object to be detected provided in the car is provided. The car position detection device detects the presence / absence of a car in a predetermined region based on the presence / absence of detection of the detected object by the position switch. The speed governor is a telescopic weight that revolves around a predetermined revolving shaft as the car moves, and a centrifugal weight that is connected to the centrifugal weight. And a switching device that expands and contracts the stretchable body so that the length of the stretchable body is different depending on whether the car is in the predetermined area or the car is out of the predetermined area. The governor detects the presence or absence of an abnormality in the speed of the car based on the amount of displacement of the telescopic body relative to the revolution shaft.

Description

  The present invention relates to an elevator apparatus having a car that is moved in a hoistway.

  Conventionally, an elevator apparatus that operates a safety device when the speed of a car exceeds a predetermined set speed has been proposed. In this conventional elevator apparatus, the position of the car is detected from the amount of rotation of a rotating body that rotates as the car moves, and the set speed is changed according to the position of the car. The set speed decreases as the position of the car approaches the end of the hoistway. Thereby, size reduction of the shock absorber provided in the pit part of the hoistway can be achieved, and the height of the whole hoistway can be shortened (refer to patent documents 1).

JP 2003-104646 A

  However, in the conventional elevator apparatus as described above, the position of the car is obtained from the amount of rotation of the rotating body. Therefore, when the elevator apparatus is installed, the relationship between the position of the car and the amount of rotation of the rotating body It is necessary to adjust each height individually. Therefore, it takes time to install the elevator apparatus.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to obtain an elevator apparatus that can be easily installed and can reduce the hoistway.

  The elevator apparatus according to the present invention includes a car that is provided with a detection object, a car that is moved in the hoistway, and a position switch that is provided in the hoistway and can detect the detection object. A car position detecting device that detects the presence or absence of a car in a predetermined region located at the terminal end of the hoistway, and a centrifugal weight that revolves around the predetermined revolution axis according to the movement of the car, A centrifugal weight is connected and is rotated around the revolution axis, and a telescopic body that is displaced with respect to the revolution axis according to the centrifugal force that the centrifugal weight receives by the revolution, and a telescopic body that is expanded and contracted, so that the car is in a predetermined area. A switching device that changes the length of the telescopic body to a different length depending on whether the car is out of a predetermined area or not, and the speed of the car is determined based on the amount of displacement of the telescopic body with respect to the revolution axis. A key to detect the presence or absence of abnormality It is equipped with a machine.

  In the elevator apparatus according to the present invention, when the car is in either the upper end region or the lower end region, and when the car is disengaged from both the upper end region and the lower end region, the length of the stretchable body is Since the lengths are different, the relationship between the amount of displacement of the stretchable body relative to the revolution axis and the speed of the car can be changed. Thereby, the value of the set overspeed when the car is in either the upper end area or the lower end area can be made lower than when the car is in the middle part of the hoistway. That is, at a location near the end of the hoistway, the car can be forcibly stopped at a stage where the car speed is lower than when the car is in the middle part of the hoistway, and the car deceleration distance can be shortened. Can do. Therefore, the size of the car shock absorber and the counterweight shock absorber can be reduced, and the height of the hoistway can be reduced. In addition, by installing the position switch in the hoistway, it is not necessary to adjust the relationship between the position of the car in the hoistway and the amount of movement of the car for each hoistway. However, the elevator apparatus can be easily installed simply by adjusting the position and number of position switches.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows the elevator apparatus by Embodiment 1 of this invention. It is a circuit diagram which shows the electrical connection state of each lower position switch of FIG. 1, each upper position switch, and a communication apparatus. FIG. 3 is a circuit diagram illustrating a state in which each of the lower position switches and the upper position switches of FIG. It is a longitudinal cross-sectional view which shows the governor of FIG. It is a longitudinal cross-sectional view which shows a governor when the cage | basket | car of FIG. 1 has remove | deviated from both a lower end part area | region and an upper end part area | region. It is a front view which shows the governor of FIG. 3 is a graph showing the relationship between the normal operation speed, the first set overspeed, and the second set overspeed of the car in FIG. 1 and the position of the car. It is a partially broken front view which shows the speed governor of the elevator apparatus by Embodiment 2 of this invention. It is sectional drawing along the IX-IX line of FIG.

Preferred embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
1 is a block diagram showing an elevator apparatus according to Embodiment 1 of the present invention. In the figure, a machine room 2 is provided in the upper part of the hoistway 1. In the machine room 2, a hoisting machine (driving device) 4 having a driving sheave 3, a deflecting wheel 5 arranged at an interval from the driving sheave 3, and a control device that controls the operation of the elevator. 6 are provided.

  A main rope 7 is wound around the driving sheave 3 and the deflector 5. A car 8 and a counterweight 9 that can move up and down in the hoistway 1 are suspended from the main rope 7. The car 8 and the counterweight 9 are moved up and down in the hoistway 1 by the rotation of the driving sheave 3. When the car 8 and the counterweight 9 are moved up and down in the hoistway 1, the car 8 is guided by a car guide rail (not shown), and the counterweight 9 is guided by a counterweight guide rail (not shown). Is done.

  An emergency stop device 10 that prevents the car 8 from falling is provided at the lower part of the car 8. The emergency stop device 10 is provided with an operation arm 11. The emergency stop device 10 grips the car guide rail by operating the operation arm 11. The fall of the car 8 is prevented by gripping the car guide rail by the safety device 10.

  A speed governor 12 is provided in the machine room 2, and a tension wheel 13 is provided in the lower part of the hoistway 1. The governor 12 includes a governor body 14 and a governor sheave 15 provided in the governor body 14. A governor rope 16 is wound between the governor sheave 15 and the tension wheel 13. One end and the other end of the governor rope 16 are connected to the operation arm 11. Thereby, the governor sheave 15 and the tension wheel 13 are rotated as the car 8 moves.

  The governor body 14 can grip the governor rope 16. The operation arm 11 is operated when the governor rope 16 is gripped by the governor body 14 and the car 8 is displaced with respect to the governor rope 16.

  A cam (detected body) 17 is provided on the side surface of the car 8 along the moving direction of the car 8. In the hoistway 1, a predetermined lower end region located at the lower end (end portion) of the hoistway 1 and a predetermined upper end region located at the upper end portion (end portion) of the hoistway 1 are set. Yes. The lower end region and the upper end region are regions having a predetermined length in the moving direction of the car 8. Further, in the hoistway 1, a lower end car position detecting device 18 for detecting the presence / absence of the car 8 in the lower end region and an upper end car position detecting device for detecting the presence / absence of the car 8 in the upper end region. 19 is provided.

  The lower-end car position detection device 18 has a plurality (three in this example) of lower position switches 18a, 18b, and 18c that can detect the cam 17. Each of the lower position switches 18 a to 18 c is provided in the lower part in the hoistway 1. Further, the lower position switches 18a to 18c are arranged at intervals with respect to the moving direction of the car 8.

  The upper-end car position detection device 19 has a plurality (three in this example) of upper position switches 19a, 19b, and 19c that can detect the cam 17. Each of the upper position switches 19 a to 19 c is provided in the upper part in the hoistway 1. Further, the upper position switches 19a to 19c are arranged at intervals with respect to the moving direction of the car 8.

  When the car 8 is in the lower end region, at least one of the lower position switches 18 a to 18 c is operated by the cam 17. When the car 8 is in the upper end region, at least one of the upper position switches 19 a to 19 c is operated by the cam 17. The lower position switches 18 a to 18 c and the upper position switches 19 a to 19 c detect the cam 17 when operated by the cam 17. When the car 8 is out of the lower end region and the upper end region and is in the intermediate portion in the hoistway 1, the operation by the cam 17 for all the lower position switches 18a to 18c and the upper position switches 19a to 19c is released. Is done.

  That is, the lower-end car position detection device 18 detects the presence or absence of the car 8 in the lower-end region based on the presence or absence of the cam 17 detected by each of the lower position switches 18a to 18c. Further, the upper car position detector 19 detects the presence or absence of the car 8 in the upper end region based on the presence or absence of the cam 17 detected by each of the upper position switches 19a to 19c.

  The intervals B between the lower position switches 18 a to 18 c and between the upper position switches 19 a to 19 c are narrower than the length A of the cam 17. Accordingly, it is possible to prevent the occurrence of a state in which all of the lower position switches 18a to 18c do not detect the cam 17 when the car 8 is moved in the lower end region. Further, it is possible to prevent the occurrence of a state where all the upper position switches 19a to 19c do not detect the cam 17 when the car 8 is moved in the upper end region.

  The lower position switches 18 a to 18 c and the upper position switches 19 a to 19 c are connected in series by an electric wire 20. The electric wire 20 is connected to a communication device 21 provided in the machine room 2. The communication device 21 wirelessly performs information communication with the governor body 14 based on the detection states of the lower position switches 18a to 18c and the upper position switches 19a to 19c.

  A car shock absorber 22 located below the car 8 and a counterweight shock absorber 23 located below the counterweight 9 are provided at the bottom (pit portion) of the hoistway 1. The car shock absorber 22 reduces the impact applied to the car 8 when the car 8 receives a collision. The counterweight buffer 23 reduces the impact applied to the counterweight 9 when the counterweight 9 receives a collision.

  FIG. 1 shows a state where the car 8 exists in the lower end region and the two lower position switches 18a and 18b detect the cam 17 at the same time.

  FIG. 2 is a circuit diagram showing an electrical connection state of the lower position switches 18a to 18c, the upper position switches 19a to 19c and the communication device 21 of FIG. FIG. 3 is a circuit diagram showing a state in which the lower position switches 18a to 18c and the upper position switches 19a to 19c of FIG. FIG. 2 is a diagram showing a state where only the two lower position switches 18a and 18b detect the cam 17.

  In the drawing, each of the lower position switches 18a to 18c and each of the upper position switches 19a to 19c has a contact that opens and closes depending on whether or not the cam 17 is detected. The contacts of the lower position switches 18a to 18c and the upper position switches 19a to 19c are opened when the cam 17 is detected and closed when the cam 17 is stopped.

  As a result, when all of the lower position switches 18a to 18c and the upper position switches 19a to 19c have stopped detecting the cam 17, all the contacts are closed as shown in FIG. A wireless signal is output to the governor body 14. In addition, when at least one of the lower position switches 18a to 18c and the upper position switches 19a to 19c detects the cam 17, some of the contacts are opened and the communication device 21 is opened as shown in FIG. The wireless signal output is stopped.

  That is, when the car 8 exists in either the upper end area or the lower end area, a radio signal is output from the communication device 21 to the governor body 14 (FIG. 3), and the car 8 is in the upper end area and the lower end area. When they are out of the range, the output of the radio signal from the communication device 21 is stopped (FIG. 2).

  4 is a longitudinal sectional view showing the governor 12 of FIG. FIG. 5 is a longitudinal sectional view showing the speed governor 12 when the car 8 of FIG. 1 is out of both the lower end region and the upper end region. Further, FIG. 6 is a front view showing the governor 12 of FIG. In the figure, the speed governor 12 is supported by a support 24. The governor body 14 is operated by the sheave interlock device 25 that is linked to the governor sheave 15 and the sheave interlock device 25 in accordance with the rotational speed of the governor sheave 15, thereby operating the elevator. A stop switch (overspeed detection switch) 26 for outputting a stop signal to stop the operation and a gripping device 27 (FIG. 6) for gripping the governor rope 16 when operated by the sheave interlocking device 25. ing.

  As shown in FIGS. 4 and 5, the sheave shaft 28 of the governor sheave 15 is horizontally supported by the support 24 via a bearing 29. A driving bevel gear 30 is fixed to the end of the sheave shaft 28.

  The sheave interlocking device 25 includes a driven shaft (predetermined revolution shaft) 31 arranged along the vertical direction, a driven bevel gear 32 that is fixed to the lower end portion of the driven shaft 31 and meshes with the drive bevel gear 30, and a driven shaft. A displacement body 33 that is provided on the body 31 and can be displaced with respect to the driven shaft 31 in a direction along the driven shaft 31; a centrifugal displacement device 34 that displaces the displacement body 33 according to the rotation of the driven shaft 31; The rotational speed of the driven shaft 31 and the amount of displacement of the displacement body 33 between when the car 8 is in either the upper end area or the lower end area or when the car 8 is out of either the upper end area or the lower end area. It has the switching device 35 which can set the centrifugal displacement apparatus 34 so that a relationship may differ.

  The driven shaft 31 is supported by the support 24 via a bearing 36. The rotation of the sheave shaft 28 is transmitted to the driven shaft 31 via the driving bevel gear 30 and the driven bevel gear 32. Accordingly, the driven shaft 31 is rotated according to the rotation of the governor sheave 15.

  The centrifugal displacement device 34 is provided on the upper portion of the driven shaft 31. Further, the centrifugal displacement device 34 is rotated integrally with the driven shaft 31. Further, the centrifugal displacement device 34 is connected to a pair of flyballs (centrifugal weights) 37 that revolve around the driven shaft 31 according to the rotation of the driven shaft 31, and the flyball 37 is connected, and can rotate around the driven shaft 31. A pair of elastic bodies 38, a sliding cylinder 39 that is slidably passed through the driven shaft 31, a pair of link members 40 that link each of the elastic bodies 38 and the sliding cylinder 39, and the sliding cylinder 39 attached downward. The balance spring 41 is energized.

  Each flyball 37 receives a centrifugal force corresponding to the rotational speed of the driven shaft 31 by revolving around the driven shaft 31.

  The elastic body 38 is displaced by rotation with respect to the driven shaft 31 in accordance with the centrifugal force received by the flyball 37. The sliding cylinder 39 is displaced in a direction along the driven shaft 31 in accordance with the displacement of each of the elastic bodies 38 with respect to the driven shaft 31. That is, when the rotational speed of the driven shaft 31 increases, the expansion / contraction body 38 is displaced in a direction in which the flyballs 37 are separated from each other, and the sliding cylinder 39 is displaced upward against the urging force of the balance spring 41. When the rotational speed of the driven shaft 31 decreases, the expansion / contraction body 38 is displaced in a direction in which the flyballs 37 approach each other, and the sliding cylinder 39 is displaced downward by the biasing force of the balance spring 41.

  Each elastic body 38 is a rod-shaped body. Each expansion body 38 includes an expansion body main body 42 that is rotatably attached to the driven shaft 31, and an actuator 43 that is provided on the expansion body main body 42 and changes the length of the expansion body 38. ing.

  The actuator 43 includes a plunger 44 that can be displaced with respect to the expansion / contraction body main body 42 and an electromagnetic coil 45 that displaces the plunger 44 with respect to the expansion / contraction body main body 42.

  The flyball 37 is attached to the plunger 44. The plunger 44 can be displaced between an extended position (FIG. 4) that is distant from the elastic body 42 and a contracted position (FIG. 5) that is closer to the elastic body 42 than the extended position. The length of the stretchable body 38 changes as the plunger 44 is displaced between the extended position and the contracted position. The plunger 44 is displaced to the contracted position by energizing the electromagnetic coil 45, and when the energization to the electromagnetic coil 45 is stopped, the plunger 44 is displaced to the extended position by a biasing force of a biasing body (not shown).

  The displacement body 33 can be displaced together with the sliding cylinder 39. Thereby, the displacement body 33 is displaced in the direction along the driven shaft 31 according to the rotational speed of the governor sheave 15. The displacement body 33 is rotatable with respect to the sliding cylinder 39 and the driven shaft 31. Accordingly, the state of the displacement body 33 is maintained without being rotated even when the sliding cylinder 39 and the driven shaft 31 are rotated. Further, the displacement body 33 includes a driven cylinder 46 that is slidably passed through the driven shaft 31 and an operation portion 47 that protrudes from the outer peripheral surface of the driven cylinder 46.

  Based on the information (wireless signal) from the communication device 21, the switching device 35 expands and contracts each stretchable body 38 to change the length of each stretchable body 38. That is, the switching device 35 receives a wireless signal from the communication device 21 (that is, when the car 8 is out of both the upper end region and the lower end region) and does not receive a wireless signal. (Ie, when the car 8 is in either the upper end region or the lower end region), the lengths of the respective stretchable bodies 38 are set to different lengths. Thereby, when the cage | basket | car 8 exists in either an upper end part area | region and a lower end part area | region, and when the cage | basket | car 8 has remove | deviated from both an upper end part area | region and a lower end part area | region, the revolution radius of each flyball 37 is Thus, the relationship between the rotational speed of the driven shaft 31 and the amount of displacement of the displacement body 33 is different.

  In this example, the switching device 35 increases the length of each stretchable body 38 when the car 8 is in either the upper end region or the lower end region, and the car 8 starts from either the upper end region or the lower end region. The length of each stretchable body 38 is shortened when it is also detached.

  The switching device 35 includes a generator 48 that generates power by the rotation of the driven shaft 31 and a switching circuit 49 that controls the power sent from the generator 48 to the electromagnetic coil 45 based on information from the communication device 21. .

  The generator 48 is provided at the upper end of the driven shaft 31. The generator 48 is a DC generator. Further, the generator 48 includes a generator fixed shaft 50 including a permanent magnet, and a generator body 51 including a power generation coil and surrounding the generator fixed shaft 50. The generator fixed shaft 50 is attached to the support 24 via an attachment metal 52. The generator body 51 is rotated integrally with the driven shaft 31. When the generator body 51 is rotated integrally with the driven shaft 31, a current corresponding to the rotation of the driven shaft 31 is generated in the power generating coil.

  The switching circuit 49 is electrically connected to each of the generator main body 51 and the electromagnetic coil 45 by conducting wires 53 and 54. Further, the switching circuit 49 is configured such that when the car 8 is in either the upper end region or the lower end region of the electric power generated by the generator 48, and the car 8 is from either the upper end region or the lower end region. Only the electric power at any time when it is off is sent to the electromagnetic coil 45.

  In this example, the current from the generator 48 is switched only when the car 8 is out of both the upper end region and the lower end region (that is, when receiving a radio signal from the communication device 21). It is sent to the electromagnetic coil 45 by the circuit 49. Therefore, when the car 8 is in either the upper end region or the lower end region, the length of each elastic body 38 is increased, and when the car 8 is out of either the upper end region or the lower end region, each elastic body. The length of 38 is shortened.

  The stop switch 26 is disposed on the radially outer side of the driven cylinder 46. The stop switch 26 includes a switch main body 55 fixed to the support 24 and a switch lever 56 provided on the switch main body 55 and protruding toward the displacement body 33. The operation unit 47 can operate the switch lever 56 by the displacement of the displacement body 33 with respect to the stop switch 26. The stop switch 26 detects an abnormality in the speed of the car 8 when the switch lever 56 is operated by the operation unit 47. That is, the stop switch 26 detects the presence / absence of an abnormality in the speed of the car 8 based on the presence / absence of the detection of the displacement body 33. A stop signal for stopping the operation of the elevator is output from the switch body 55 when the stop switch 26 detects an abnormality in the speed of the car 8.

  When the length of each expansion / contraction body 38 is long, the revolution radius of each fly ball 37 is large, so that the displacement amount of the displacement body 33 is larger than when the length of each expansion / contraction body 38 is short. Become. Therefore, when the length of each expansion / contraction body 38 is long, the displacement body 33 reaches a position where the switch lever 56 is operated at a stage where the rotational speed of the driven shaft 31 is lower than when the length of each expansion / contraction body 38 is short. It becomes. That is, the speed of the car 8 (first set overspeed) when the stop switch 26 detects an abnormality is when the length of each telescopic body 38 is short (the car 8 is either the upper end area or the lower end area). When the length of each elastic body 38 is long (when the car 8 is in either the upper end region or the lower end region), the value is lower than when the length of each stretchable body 38 is longer.

  The control device 6 controls the operation of the elevator based on information from the stop switch 26. In this example, the control device 6 receives the stop signal from the stop switch 26, determines that an abnormality has occurred in the speed of the car 8, and performs control to stop the operation of the elevator.

  As shown in FIG. 6, the gripping device 27 is disposed below the governor sheave 15. The gripping device 27 includes a fixed shoe 57 fixed to the support 24, a gripping position for gripping the governor rope 16 between the fixed shoe 57, and an open position farther from the fixed shoe 57 than the gripping position. A movable shoe 58 that can be displaced between the movable shoe 58 and the fixed shoe 57, and a displacement pressing device 59 that generates a gripping force for gripping the governor rope 16 between the movable shoe 58 and the fixed shoe 57. A holding device 60 that holds the movable shoe 58 in an open position and releases the holding of the movable shoe 58 when the speed of the car 8 reaches a second set overspeed that is higher than the first set overspeed; Yes.

  The displacement pressing device 59 is connected between the mounting portion provided on the support 24 and the movable shoe 58 and is extendable and contractible, and the shoe extending and retracting arm 61 is provided on the shoe extending and retracting arm 61 and is separated from the mounting portion of the support 24. And a pressing spring (biasing body) 62 that biases the movable shoe 58 in the direction.

  The shoe extendable arm 61 is rotatably connected to the attachment portion of the support 24 and the movable shoe 58. The movable shoe 58 is displaced between the gripping position and the opening position when the shoe telescopic arm 61 is rotated with respect to the attachment portion of the support 24. The shoe extendable arm 61 is pushed by the fixed shoe 57 and contracts when the movable shoe 58 is displaced to the gripping position. The shoe telescopic arm 61 extends by receiving the urging force of the pressing spring 62 when the movable shoe 58 is displaced to the open position.

  The pressing spring 62 is contracted between the attachment portion of the support 24 and the movable shoe 58. The pressing spring 62 is a coil spring in which the shoe telescopic arm 61 is passed. The urging force by the pressing spring 62 is further increased when the shoe telescopic arm 61 is contracted.

  The gripping force by the displacement pressing device 59 is generated when the movable shoe 58 is displaced to the gripping position and the urging force of the pressing spring 62 is increased.

  The holding device 60 is engaged with an engagement lever 63 that is displaceable between an engagement position that engages the movable shoe 58 and a release position that disengages the movable shoe 58, and an engagement lever 63 that is displaced to the release position. A release spring (biasing body) 64 that biases the lever 63 and a pressing member 65 that holds the engagement lever 63 at the engagement position against the biasing force of the release spring 64 are provided.

  The engagement lever 63 is displaced between the engagement position and the release position by rotating around the lever shaft 66 provided on the support 24. The release spring 64 is connected between the engagement lever 63 and the support 24.

  The pressing member 65 is rotatable about a support shaft 67 provided on the support 24. Further, the pressing member 65 is connected to the displacement body 33 via a link 68. Thereby, the pressing member 65 is rotated around the support shaft 67 according to the displacement of the displacement body 33.

  The link 68 is rotatably connected to each of the displacement body 33 and the pressing member 65. Further, the link 68 is displaced upward as the rotational speed of the driven shaft 31 increases.

  The engagement lever 63 is normally held at the engagement position by the pressing member 65. The holding member 65 is rotated in the direction in which the engagement lever 63 is released by the upward displacement of the link 68. The holding of the engagement lever 63 by the pressing member 65 is released when the speed of the car 8 exceeds the first set overspeed and reaches the second set overspeed.

  When the holding of the engagement lever 63 by the pressing member 65 is released, the engagement lever 63 is displaced from the engagement position to the release position by the urging force of the release spring 64, and the engagement between the movable shoe 58 and the engagement lever 63 is performed. Come off. When the engagement between the movable shoe 58 and the engagement lever 63 is released, the movable shoe 58 is displaced to the gripping position by its own weight, and the governor rope 16 is gripped between the fixed shoe 57 and the movable shoe 58.

  FIG. 7 is a graph showing the relationship between the normal operation speed, the first set overspeed, and the second set overspeed of the car 8 in FIG. 1 and the position of the car 8. As shown in the figure, the value of the first set overspeed 72 (the speed of the car 8 when the stop switch 26 outputs a stop signal) is the normal operation of the car 8 at all positions where the car 8 moves. The value is higher than the speed 71. The value of the second set overspeed 73 (the speed of the car 8 when the emergency stop device 10 is operated by gripping the governor rope 16 by the governor body 14) is the value at all positions where the car 8 moves. The value is higher than the value of the first set overspeed 72.

The value of the first set overspeed 72 is such that the length of the stretchable body 38 changes depending on whether the car 8 is in either the upper end region or the lower end region. When it is in one of the partial areas, the first terminal reference value V _{os ′} is lower than the rated speed value V ₀ of the elevator, and when the car 8 is out of either the upper end area or the lower end area. The first intermediate reference value V _os (for example, a value 1.3 times the rated speed) is higher than the rated speed value V ₀ of the elevator.

The value of the second set overspeed 73 is such that the length of the stretchable body 38 changes depending on whether the car 8 is in either the upper end region or the lower end region. When the vehicle is in any of the partial areas, the elevator terminal has a second terminal reference value V _{tr ′} that is lower than the rated speed value V ₀ of the elevator and higher than the first terminal reference value V _{os ′.} The second intermediate reference value V _tr is higher than the first intermediate reference value V _os when it is out of any of the lower end regions.

  Next, the operation will be described. When the car 8 is moved at the normal operation speed 71, the speed of the car 8 does not reach the first and second set overspeeds 72 and 73, so that the operation of the elevator is forcibly stopped. Absent.

  When the speed of the car 8 increases for some reason and reaches the first set overspeed 72, a stop signal is sent from the stop switch 26 to the control device 6. When the control device 6 receives the stop signal, the operation of the elevator is forcibly stopped by the control device 6.

  Thereafter, when the speed of the car 8 further increases and reaches the second set overspeed even though the operation stop control is performed by the control device 6, the governor rope 16 is moved to the governor 12. Is gripped by. Thereby, the movement of the governor rope 16 is stopped, and the car 8 is displaced with respect to the governor rope 16.

  When the car 8 is displaced with respect to the governor rope 16, the operation arm 11 is operated, and the operation for gripping the car guide rail is performed by the emergency stop device 10. As a result, a braking force is directly applied to the car 8.

  Next, an operation when switching the values of the first and second set overspeeds 72 and 73 will be described. When the car 8 is in the middle of the hoistway 1 (that is, when the car 8 is out of both the upper end region and the lower end region), the lower position switches 18a to 18c and the upper position switches All of 19a to 19c do not detect the cam 17. At this time, a radio signal is sent from the communication device 21 to the switching circuit 49, and power is supplied from the generator 48 to each electromagnetic coil 45 via the switching circuit 49.

When power is supplied to each electromagnetic coil 45, each expansion / contraction body 38 contracts and the length of each expansion / contraction body 38 becomes short. As a result, the revolution radius of each flyball 37 becomes smaller, the value of the first set overspeed 72 becomes the first intermediate portion reference value _Vos, and the value of the second set overspeed 73 becomes the second intermediate portion reference. The value V _{tr is} assumed.

  When the car 8 moves and enters either the upper end region or the lower end region from the middle portion of the hoistway 1, any one of the lower position switches 18a to 18c and the upper position switches 19a to 19c detects the cam 17. To do. Thereby, the output of the radio signal from the communication device 21 is stopped, and the power supply to each electromagnetic coil 45 is stopped.

When the power supply to each electromagnetic coil 45 is stopped, each stretchable body 38 extends and the length of each stretchable body 38 increases. Thereby, the revolution radius of each fly ball 37 is increased, the value of the first set overspeed 72 is switched to the first end portion reference value V _{os ′} lower than the first intermediate portion reference value V _os , and the second The value of the set overspeed 73 is switched to the second end portion reference value V _{tr ′} lower than the second intermediate portion reference value V _tr .

When the car 8 enters the intermediate portion of the hoistway 1 from either the upper end region or the lower end region, the value of the first set overspeed 72 is changed to the first end portion reference value V _os by the reverse operation. _' Is switched to the first intermediate portion reference value V _os, and the value of the second set overspeed 73 is switched from the second end portion reference value V _tr' to the second intermediate portion reference value V _tr .

  In such an elevator apparatus, when the car 8 is in either the upper end region or the lower end region, and when the car 8 is out of either the upper end region or the lower end region, Since the lengths are different from each other, the relationship between the displacement amount of the expansion / contraction body 38 with respect to the driven shaft 31 and the rotational speed of the driven shaft 31 can be changed. Accordingly, when the car 8 is in either the upper end region or the lower end region, the respective values of the first and second set overspeeds 72 and 73 are obtained, and the car 8 is in the intermediate portion of the hoistway 1. Compared to, it can be lowered. That is, the car 8 can be forcibly stopped at a position near the terminal part of the hoistway 1 at a stage where the speed of the car 8 is lower than when the car 8 is in the middle part of the hoistway 1. Deceleration distance can be shortened. Accordingly, the car shock absorber 22 and the counterweight shock absorber 23 can be reduced in size, and the height dimension of the hoistway 1 can be reduced.

  Further, by installing the lower position switches 18 a to 18 c and the upper position switches 19 a to 19 c in the hoistway 1, the relationship between the position of the car 8 in the hoistway 1 and the movement amount of the car 8 is set for each hoistway 1. Since there is no need for adjustment, even if the height of each hoistway 1 is different, the elevator apparatus can be easily installed only by adjusting the position and number of the lower position switch and the upper position switch.

  In addition, the switching device 35 includes a generator 48 that generates electric power by the rotation of the driven shaft 31 and, when the car 8 is in either the upper end region or the lower end region of the electric power generated by the generator 48 and the car 8. Has a switching circuit 49 that sends only the electric power to the electromagnetic coil 45 at any time when it is out of these areas, so that it is necessary to newly supply power from the outside in order to change the length of the expansion / contraction body 38 Can be eliminated.

  Further, since the interval between the lower position switches 18a to 18c and the interval between the upper position switches 19a to 19c are narrower than the length of the cam 17, the car 8 is in either the upper end region or the lower end region. Sometimes, it is possible to prevent the lower position switches 18 a to 18 c and the upper position switches 19 a to 19 c from detecting the cam 17. Thereby, the presence or absence of the cage | basket | car 8 in each of an upper end part area | region and a lower end part area | region can be detected more reliably.

  In the above example, information indicating whether the car 8 is in either the upper end region or the lower end region is sent to the switching circuit 49 by a radio signal from the communication device 21. Information on whether 8 is in either the upper end region or the lower end region may be sent to the switching circuit 49 by wire. In this case, instead of the communication device 21, two brushes are connected to one end and the other end of the electric wire 20, and two sliding portions that are in contact with each brush are provided on the driven shaft 31. Each sliding portion is electrically connected to the switching circuit 49. Information about whether the car 8 is in either the upper end region or the lower end region is sent to the switching circuit 49 via each brush and each sliding portion.

Embodiment 2. FIG.
FIG. 8 is a partially broken front view showing a speed governor for an elevator apparatus according to Embodiment 2 of the present invention. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. In the figure, the support 24 is a U-shaped member having a pair of opposing walls facing each other. Bearings 29 are individually attached to the opposing walls of the support 24. A sheave shaft (predetermined revolution shaft) 28 of the governor sheave 15 is supported by the support 24 via each bearing 29. The governor sheave 15 and the sheave shaft 28 are rotated together as the car 8 moves.

  The speed governor sheave 15 is connected to a pair of centrifugal weights 81 that revolve around the sheave shaft 28 in response to the rotation of the sheave shaft 28, and the centrifugal weight 81. A pair of extendable bodies 82 that are pivotably connected to each other are supported.

  The centrifugal weight 81 receives a centrifugal force corresponding to the rotational speed of the sheave shaft 28 by revolving around the sheave shaft 28.

  The stretchable body 82 is displaced with respect to the sheave shaft 28 by the rotation about the pin 83 in accordance with the centrifugal force received by the centrifugal weight 81. Thereby, when the rotational speed of the sheave shaft 28 increases, the telescopic body 81 is displaced with respect to the sheave shaft 28 in the direction away from the sheave shaft 28, and when the rotational speed of the sheave shaft 28 decreases, The stretchable body 82 is displaced relative to the sheave axle 28 in a direction approaching the axle 28.

  The expansion / contraction body 82 is provided in a rotation weight portion (extension body main body) 84 that can rotate around a pin 83 provided in the governor sheave 15 and a rotation weight portion 84. And an actuator 85 for changing the height. The rotating weight portions 84 are connected to each other via a link member 86.

  The actuator 85 has the same configuration as the actuator 43 of the first embodiment, and includes a plunger and an electromagnetic coil. The actuator 85 is arranged along the radial direction of the governor sheave 15.

  The centrifugal weight 81 is attached to the plunger of the actuator 85. Further, the centrifugal weight 81 is disposed on the radially outer side of the governor sheave 15 with respect to the rotating weight portion 84. The length of the stretchable body 82 changes when the plunger of the actuator 85 is displaced between the extended position and the contracted position. The length of the expansion / contraction body 82 is shortened by energization of the electromagnetic coil of the actuator 85, and is lengthened by the urging force of an urging body (not shown) when the energization of the electromagnetic coil of the actuator 85 is stopped.

  The centrifugal weight 81 is displaced with respect to the rotating weight portion 84 in a direction away from the sheave shaft 28 as the length of the telescopic body 82 becomes longer, and approaches the sheave shaft 28 as the length of the telescopic body 82 becomes shorter. It is displaced relative to the rotating weight 84 in the direction.

  A balance spring 87 that opposes the centrifugal force received by the centrifugal weight 81 is provided between one end of the rotating weight portion 84 and the governor sheave 15. An operation portion (bolt in this example) 88 is fixed to the other end portion of the one rotating weight portion 84. The operating portion 88 is displaced in a direction away from the sheave shaft 28 when the rotational speed of the sheave shaft 28 increases, and is displaced in a direction approaching the sheave shaft 28 when the rotational speed of the sheave shaft 28 decreases. Further, an engaging claw 89 is provided on one rotating weight portion 84. The engaging claw 89 is displaced in a direction approaching the sheave shaft 28 when the rotational speed of the sheave shaft 28 increases, and is displaced in a direction away from the sheave shaft 28 when the rotational speed of the sheave shaft 28 decreases.

  As shown in FIG. 9, the sheave axle 28 is provided with a switching device 90 that changes the length of the stretchable body 82 based on information (wireless signal) from the communication device 21. The switching device 90 receives a wireless signal from the communication device 21 (that is, when the car 8 is out of both the upper end region and the lower end region) and does not receive a wireless signal (ie, When the car 8 is in either the upper end region or the lower end region), the length of the stretchable body 82 is set to a different length.

  In this example, the switching device 90 increases the length of the stretchable body 82 when the car 8 is in either the upper end region or the lower end region, and the car 8 is from either the upper end region or the lower end region. The length of the elastic body 82 is shortened when it is detached.

  The switching device 90 includes a generator 91 that generates power by rotating the sheave shaft 28, and a switching circuit 92 that controls electric power sent from the generator 91 to the electromagnetic coil of the actuator 85 based on information from the communication device 21. ing.

  The generator 91 includes an annular generator fixing portion 93 including a permanent magnet, and an annular generator body 94 including a generator coil and surrounding the generator fixing portion 93. The generator fixing portion 93 is fixed to the support 24. Further, the generator fixing portion 93 surrounds the sheave shaft 28 via a gap. The generator body 94 is fixed to the governor sheave 15 and is rotated integrally with the governor sheave 15 and the sheave shaft 28. When the generator main body 94 is rotated, a current corresponding to the rotation of the governor sheave 15 and the sheave shaft 28 is generated in the power generating coil.

  The switching circuit 92 is fixed to the generator body 94. Therefore, the switching circuit 92 is rotated integrally with the governor sheave 15 and the sheave shaft 28. The switching circuit 92 is electrically connected to each of the electromagnetic coil of the actuator 85 and the generator main body 94 by a conducting wire 95. The switching circuit 92 has the same configuration as the switching circuit 49 of the first embodiment. Therefore, in this example, the current from the generator 91 is only when the car 8 is out of both the upper end region and the lower end region (that is, when receiving a radio signal from the communication device 21). , And sent to the electromagnetic coil of the actuator 85 by the switching circuit 92.

  As shown in FIG. 8, a stop switch (overspeed detection switch) 96 is attached to the support 24. The stop switch 96 has the same configuration as the stop switch 26 of the first embodiment, and includes a switch body 55 and a switch lever 56.

  The operation portion 88 can operate the switch lever 56 by the displacement of the rotating weight portion 84 with respect to the sheave shaft 28. The stop switch 96 detects an abnormality in the speed of the car 8 when the switch lever 56 is operated by the operation unit 88. A stop signal for stopping the operation of the elevator is output from the switch body 55 when the stop switch 96 detects an abnormality in the speed of the car 8.

  The speed of the car 8 (first set overspeed) when the stop switch 96 detects an abnormality in the speed of the car 8 is that when the length of the telescopic body 82 is short due to the difference in the revolution radius of the centrifugal weight 81 ( When the length of the stretchable body 82 is longer than when the car 8 is out of both the upper end region and the lower end region (when the car 8 is in either the upper end region or the lower end region). Is a lower value.

  A claw wheel 97 that is rotatable about the sheave shaft 28 is supported on the support 24. A plurality of teeth are provided on the outer periphery of the claw wheel 97. The claw wheel 97 is rotatable independently of the governor sheave 15. The engaging claw 89 is displaced in a direction approaching the outer peripheral portion of the claw wheel 97 as the rotational speed of the sheave shaft 28 increases. The engaging claw 89 is engaged with the outer peripheral portion of the claw wheel 97 when the speed of the car 8 reaches a second set overspeed that is higher than the first set overspeed.

  The support 24 is provided with an arm 98 so as to be rotatable. A shoe (braking piece) 99 that is pressed against the governor sheave 15 via the governor rope 16 is rotatably provided at an intermediate portion of the arm 98. A spring shaft 100 is passed through the tip of the arm 98. An operating lever 101 is connected between one end of the spring shaft 100 and the claw wheel 97. The other end of the spring shaft 100 is provided with a spring receiving member 102 and a nut 103 that prevents the spring receiving member 102 from being detached from the spring shaft 100. A pressing spring 104 for generating a gripping force for gripping the governor rope 16 is provided between the distal end portion of the arm 98 and the spring receiving member 102.

  The gripping device that grips the governor rope 16 includes a claw wheel 97, an arm 98, a shoe 99, a spring shaft 100, an operating lever 101, a spring receiving member 102, a nut 103, and a pressing spring 104. The governor rope 16 is gripped between the governor sheave 15 and the shoe 99 when the shoe 99 is pressed against the governor sheave 15 via the governor rope 16. Other configurations are the same as those in the first embodiment.

  The values of the first and second set overspeeds can be switched by changing the length of the stretchable body 82. The operation for switching the first and second set overspeed values is the same as in the first embodiment.

  Next, the operation of the governor 12 will be described. When the governor sheave 15 rotates with the sheave shaft 28 according to the movement of the car 8, the centrifugal weight 81 is displaced together with the telescopic body 82 according to the rotation of the governor sheave 15.

  When the speed of the car 8 increases for some reason and reaches the first set overspeed, the switch lever 56 is operated by the operation unit 88 and a stop signal is sent from the stop switch 96 to the control device 6. When the control device 6 receives the stop signal, the operation of the elevator is forcibly stopped by the control device 6.

  Thereafter, when the speed of the car 8 is further increased and the second set overspeed is reached even though the control for stopping the operation is performed, the engaging claw 89 is engaged with the outer peripheral portion of the claw wheel 97. Combined. Thereby, the claw wheel 97 is slightly rotated together with the governor sheave 15.

  Thereafter, the rotation of the claw wheel 97 is transmitted to the arm 98 via the operating lever 101, the spring shaft 100, the spring receiving member 102, and the pressing spring 104, and the arm 98 is rotated in a direction approaching the governor sheave 15. Is done. As a result, the shoe 99 comes into contact with the governor rope 16, and the shoe 99 is pressed against the governor rope 16 by the pressing spring 104. As a result, the governor rope 16 is gripped between the governor sheave 15 and the shoe 99. The subsequent operation is the same as in the first embodiment.

  In this way, even if the centrifugal weight 81 is revolved around the sheave shaft 28 of the governor sheave 15, the displacement amount of the expansion body 82 with respect to the sheave shaft 28 and the sheave shaft 28 are the same as in the first embodiment. It is possible to change the relationship with the rotation speed. From this, the respective values of the first and second set overspeeds 72 and 73 when the car 8 is in either the upper end region or the lower end region can be made lower than the rated speed, and the car 8 The deceleration distance can be shortened. Accordingly, the car shock absorber 22 and the counterweight shock absorber 23 can be reduced in size, and the height dimension of the hoistway 1 can be reduced.

  In the above example, information indicating whether the car 8 is in either the upper end area or the lower end area is sent to the switching circuit 92 by a radio signal from the communication device 21. Information regarding whether 8 is in either the upper end region or the lower end region may be sent to the switching circuit 92 by wire. In this case, instead of the communication device 21, two brushes are connected to one end and the other end of the electric wire 20, and two sliding portions in contact with each brush are provided on the sheave shaft 28. Each sliding portion is electrically connected to the switching circuit 92. Information on whether or not the car 8 is in either the upper end region or the lower end region is sent to the switching circuit 92 via each brush and each sliding portion.

  Moreover, in each said embodiment, although the electric power generated with a generator is sent to an electromagnetic coil, you may make it send the electric power supplied, for example from a commercial power supply, a battery, etc. to an electromagnetic coil. .

In each of the above embodiments, each value of the first and second set overspeeds 72 and 73 when the car 8 is in either the upper end region or the lower end region is the rated speed value V of the elevator. _{Although the} value is lower than ₀ , when the car 8 is in either the upper end region or the lower end region, only the value of the second set overspeed 73 is higher than the rated speed value V ₀ of the elevator. Each of the first and second set overspeeds 72 and 73 may be higher than the rated speed value V ₀ of the elevator.

Claims (3)

A car provided with a body to be detected and moved in a hoistway;
A position switch provided in the hoistway and capable of detecting the object to be detected; and the presence or absence of detection of the object to be detected by the position switch in the predetermined region located at the end of the hoistway. A car position detecting device for detecting the presence or absence of a car, a centrifugal weight that revolves around the predetermined revolution axis according to the movement of the car, and the centrifugal weight is connected and rotated around the revolution axis. An extension body that is displaced with respect to the revolution axis according to the centrifugal force received by the centrifugal weight by the revolution, and the extension body is extended and contracted so that the car is in the predetermined region and the car A switching device that makes the length of the expansion / contraction body different from that when it is outside the predetermined region, and based on the amount of displacement of the expansion / contraction body with respect to the revolution axis, Detect presence or absence An elevator apparatus comprising a speed governor. The elastic body has an electromagnetic coil that changes the length of the elastic body by receiving power,
The switching device includes a generator that generates electric power in response to the revolution of the centrifugal weight, and the electric power generated by the generator when the car is within the predetermined area and the car from the predetermined area. The elevator apparatus according to claim 1, further comprising: a switching circuit that sends only electric power to any one of the electromagnetic coils when it is disconnected. The car position detecting device has a plurality of the position switches arranged at intervals from each other along the moving direction of the car,
3. The elevator apparatus according to claim 1, wherein an interval between the position switches is narrower than a length of the detection object along a moving direction of the car.

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