JP2017075018A - Balancing rope type elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure, for a balancing rope type elevator, a margin distance between a tension wheel and a pit floor surface without performing a truncation treatment for a balancing rope which requires time.SOLUTION: A balancing rope type elevator 10 comprises: a main rope 24 driven to be sent in a hoistway 12; a car 20 suspended and connected to one end side of the main rope 24; a counterweight 22 suspended and connected to the other end side of the main rope 24; a balancing rope 30 connected to a lower end side of the car and a lower end side of the counterweight, and balancing the car 20-side mass of the main rope 24 and the counterweight 22-side mass with each other; a tension wheel 60 suspended from a rope part formed at a lower end of the balancing rope 30; a take-up drum provided at a car-side end of the balancing rope 30 and capable of rotating in one take-up direction of the balancing rope 30; and a take-up motor driving and rotating the take-up drum.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a balance rope type elevator, and more particularly to a balance rope type elevator that can secure a marginal distance between a tension wheel suspended from a lower end of the balance rope and a pit floor surface.

  In the elevator, the car is connected to the counterweight by a main rope via a hoist. When the elevator's lifting / lowering stroke becomes longer, such as elevators in high-rise buildings in recent years, the length of the main rope also increases, and depending on the position of the car, Balance occurs. In order to compensate for this imbalance and balance the mass on the car side and the mass on the counter weight side, a balancing rope having the same unit mass per length as the main rope is used. The balancing rope has one end connected to the car and the other end connected to the counterweight. A tension wheel that applies a certain tension to the balance rope is suspended from a loop portion formed at the lower end of the balance rope.

  Patent Document 1 states that the other end of the balancing rope is attached to the side surface of the counter weight of the weight frame on the car side. Patent Document 2 states that when the main rope and the balance rope are stretched so that the tension wheel hits the floor of the pit, not only the tension of the balance rope cannot be kept constant but also the balance rope may be entangled with peripheral devices. ing. Therefore, it is stated that the marginal distance between the tensioned vehicle and the pit floor should not be less than a predetermined value by cutting off the balance rope.

  As a technique related to the present invention, Patent Document 3 discloses a first winding device at the lower part of the car for the imbalance between the weight of the car and the counterweight generated with the increase or decrease of passengers in the car. It is disclosed that a second winding device is attached to the lower part of the counterweight. One end of the balancing rope is wound around the first winding device so as to be able to wind and feed out, and the other end of the balancing rope is wound around the second winding device so as to be able to wind and feed out. Here, the mass of the car including the passenger is detected, and the first amount is calculated according to the winding amount and the feeding amount of the balancing rope calculated according to the unbalance amount between the mass of the car and the mass of the counterweight. The winding device and the second winding device are driven.

Japanese Utility Model Publication No. 58-034869 JP-A-7-237488 JP 2009-21520 A

  In the balance rope type elevator, if the main rope or the balance rope stretches due to aging, etc., there will be less margin between the tension wheel suspended at the lower end of the balance rope and the pit floor surface, which will hinder the elevator running. obtain. In the prior art, the length of the balance rope is cut off on the counterweight side, etc., but the balance rope cut-off process takes a lot of time, and if it is urgent, the elevator will run for a long time. Will be stopped. Accordingly, there is a demand for a balanced rope type elevator that can secure a marginal distance between the tensioned vehicle and the pit floor without performing a time-consuming process of trimming the balanced rope.

  The balance rope type elevator according to the present invention includes a main rope that is driven and driven in a hoistway by a driving device, a ride that is suspended from one end of the main rope, and a suspended connection to the other end of the main rope. The counter weight is connected to the lower end side of the car and the lower end side of the counter weight, and is formed at the lower end of the counter rope and the balance rope that balances the car side mass of the main rope with the counter weight side mass. A tensioner suspended on the loop part, a winding drum provided at the end of the balancing rope on the car side and capable of rotating in one direction in the winding direction of the balancing rope, and a winding for rotating the winding drum A take-off motor.

  According to the balance rope type elevator having the above-described configuration, the winding drum capable of rotating in one direction in the winding direction of the balance rope is provided. If the take-up drum is rotated, a marginal distance between the tensioning vehicle and the pit floor surface can be secured without performing a balancing rope cutting process.

  In the balance rope type elevator according to the present invention, the winding drum has a central shaft connected to the output shaft of the winding motor and an outer peripheral surface having a diameter larger than the outer diameter of the central shaft and on which the balancing rope is wound. A winding portion and a plurality of latch teeth provided at a predetermined pitch interval along the circumferential direction of the winding portion, and latched to a mounting member for attaching the central axis of the winding drum and the winding motor to the car It is preferable to provide a latch claw portion that meshes with the teeth and restricts the rotation direction of the winding drum to one-way rotation.

  According to the balance rope type elevator having the above configuration, the latching teeth are provided on the take-up drum. For example, the latch mechanism is configured by the latch claw provided on the member that takes a fixed position with respect to the take-up drum. Thereby, the rotation direction of the winding drum is only one-way rotation, and the auxiliary rope wound around the winding drum is not unwound unexpectedly.

  In the balanced rope type elevator according to the present invention, a first detection for detecting that the height position of the stretcher with respect to the pit floor surface, which is the bottom of the hoistway, has been lowered to a predetermined first position and outputting a first signal. The winding motor preferably starts the winding drive of the winding drum based on the first signal, and stops the winding drive when the predetermined winding is completed.

  According to the balance rope type elevator having the above-described configuration, the winding drive of the winding drum is started based on the first signal that is output when the height position of the tension wheel is lowered to the first position, and a predetermined winding is performed. When the process is completed, the winding drive is stopped. Thereby, the marginal distance between a tensioned vehicle and a pit floor surface can be ensured, without performing the cutting process of a balance rope.

  In the balance rope type elevator according to the present invention, the height position of the tension vehicle is higher than the first position by a predetermined height from the pit floor surface as the second position, and the height position of the tension vehicle is the first position from the first position. It is preferable that a second detection unit that detects that the position has risen to the second position and outputs a second signal is provided, and the winding motor stops winding driving based on the second signal.

  According to the balance rope type elevator having the above configuration, the difference in height between the second position and the first position is a predetermined height. As a result, the winding motor winds up the balance rope about twice as long as the predetermined height to complete the winding, so that it is possible to always wind the balancing rope of a certain length.

  In the balance rope type elevator according to the present invention, the winding motor acquires the first signal and starts winding driving with a predetermined pitch interval for the plurality of latch teeth provided on the winding drum as a winding unit. It is preferable to stop the winding drive by rotating the winding drum by a predetermined winding unit.

  According to the balance rope type elevator having the above configuration, the balance rope winding unit is a pitch interval for a plurality of latch teeth, so that the winding length per winding process is a predetermined winding unit. The corresponding length is always constant, and there is no work variation due to individual differences.

  In the balance rope type elevator according to the present invention, the first position is preferably higher than a limit position determined as a limit of a height position at which the tensioned vehicle can be lowered with respect to the pit floor surface.

  According to the balance rope type elevator of the above configuration, when the height position reaches the first position before reaching the limit position where operation stop processing is performed on the balance rope type elevator even when the tensioned vehicle is lowered. Begin winding the balance rope. Thereby, the influence on the operation plan of a balanced rope type elevator can be reduced.

  According to the balance rope type elevator according to the present invention, it is possible to secure a marginal distance between the tensioned vehicle and the pit floor surface without performing time-consuming truncation processing of the balance rope.

It is a lineblock diagram of a balance rope type elevator in an embodiment concerning the present invention. It is a figure which shows the winding mechanism part containing the winding drum and winding motor in FIG. FIG. 2A is a perspective view, and FIG. 2B is a view showing a latch mechanism for one-way rotation in the winding drum. It is a figure which shows the content of the winding control part in FIG. In FIG. 3, it is a figure which shows the relationship between a 1st signal, a 2nd signal, and the output to a winding drive circuit. In the configuration of FIG. 1, it is a diagram showing a change in the on / off state of the limit detection unit, the first detection unit, and the second detection unit when the height position of the tension vehicle changes with time. Here, FIGS. 5A to 5F show the ON / OFF states of the detection units in the five times from ta to tf, respectively. It is a figure which shows the state change of FIG. 5 with a time chart. FIG. 5 (a) is a diagram showing the time change of the height of the tension wheel, and FIG. 5 (b) is the time change of the signal level of the limit signal, the first signal and the second signal, and the winding of the winding motor. It is a figure which shows a drive period.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. The shape, dimensions, number, number, and the like described below are examples for explanation, and can be appropriately changed in accordance with the specifications of the balance rope type elevator, the structure of the hoistway, and the like. For example, the number of balancing ropes is three, but other numbers may be used.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a configuration diagram of a balanced rope type elevator 10. The balance rope type elevator 10 has a hoistway 12 that vertically passes through a building. The uppermost part of the hoistway 12 is a machine room 14, and the lowermost part is a pit 16. Hereinafter, the floor surface of the pit 16 is referred to as a pit floor surface 17. The building is a high-rise building. In FIG. 1, the first floor landing floor 18 and the top floor landing floor 19 are shown. However, since the total number of floors is, for example, 36 floors, the intermediate floor landing floor is appropriately omitted. did. The hoistway 12 is connected to a car 20 for carrying passengers and a counter weight 22 for balancing the car 20 with a main rope 24, and a hoisting machine that is a main rope driving device disposed in the machine room 14. The main rope 24 is driven to move up and down in the hoistway 12 by 26. As a result, the car 20 moves up and down, and the counterweight 22 moves up and down in the direction opposite to the car 20. This operation control or the like is performed by the operation control unit 92 of the control device 90 provided in the machine room 14. Since the configuration up to here is the same as that of a general elevator, detailed description thereof is omitted. Hereinafter, the balanced rope type elevator 10 is simply referred to as an elevator 10.

  FIG. 1 shows a vertical direction, a depth direction, and a width direction as three directions orthogonal to each other. The vertical direction is the vertical direction of the hoistway 12, the upper side is the uppermost floor side, and the lower side is the pit 16 side. The depth direction is a direction from the elevator hall side of the building toward the hoistway 12 side. The width direction is the opening / closing direction of the car door of the car 20 and the landing door on the landing floor.

  The balance rope 30 has one end connected to the counterweight 22 side and the other end connected to the car 20 side. The unit mass per length of the balance rope 30 is substantially the same as that of the main rope 24, and the total length of the balance rope 30 is substantially the same as that of the main rope 24 in the configuration example of FIG. 1. The number of counter ropes 30 is the same as the number of main ropes 24. Here, the number of main ropes 24 is three, and the number of counter ropes 30 is three (see FIG. 2). By using the balance rope 30, in the elevator 10 having a long up and down stroke, the mass of the long main rope 24 on the side of the car 20 and the mass on the side of the counter weight 22 are balanced according to the position of the car 20.

  The winding mechanism 40 is a mechanism that is connected to the other end, which is the end of the balancing rope 30 on the car 20 side, and winds up the other end. The winding mechanism unit 40 winds the balance rope 30 to secure a marginal distance between the tensioning vehicle 60 and the pit floor surface 17 described below when the balancing rope 30 is extended. Adjust the height position.

  FIG. 2 is a diagram illustrating the winding mechanism unit 40. FIG. 2A is a perspective view, and FIG. 2B is a view showing a latch mechanism for one-way winding of the balance rope 30. The winding mechanism 40 is attached to the outer bottom surface 21 of the car 20 using the attachment members 42 and 43. The winding mechanism unit 40 includes a winding motor 44 and a winding drum 50.

  The winding motor 44 is a winding driving device that operates under the control of the control device 90 connected by the signal line 86. The output shaft 45 of the winding motor 44 is connected to the winding drum 50. Thereby, the winding drum 50 can be rotated under the control of the control device 90. The take-up motor 44 is preferably a low-rotation, large-torque motor because the balance rope 30 has a considerable mass and the take-up length can be finely adjusted. For example, a geared motor having a gear reduction mechanism is used. The type of the winding motor 44 may be a DC motor or a stepping motor. The winding motor 44 is attached to the outer bottom surface 21 of the car 20 with its outer shape fixed to the mounting member 42.

  The winding drum 50 is a cylindrical member and is rotated by a winding motor 44. On the cylindrical outer peripheral surface 51 of the winding drum 50, the other end, which is the end portion of the balancing rope 30 on the side of the car 20, is fixed. When the winding drum 50 is rotated by the winding motor 44, the balancing rope 30 is wound along the cylindrical outer peripheral surface 51 of the winding drum 50. It is preferable to provide a winding guide groove on the cylindrical outer peripheral surface 51 of the winding drum 50 so that the balance rope 30 can be wound in alignment. In the example of FIG. 2, the winding drum 50 is configured in a form in which three cylindrical shapes are connected corresponding to the three balancing ropes 30.

  The take-up drum 50 is provided with a latch mechanism that restricts the rotation direction to only one direction so that the wound balance rope 30 is not rewound. The latch mechanism can be provided at an arbitrary position along the axial direction of the take-up drum 50. FIG. 2A shows an example where the latch mechanism is provided at the end on the attachment member 43 side.

  The configuration of the winding drum 50 including the latch mechanism will be described with reference to FIG. FIG. 2B is a view of the end of the winding drum 50 on the attachment member 43 side in FIG. 2 as viewed from a direction perpendicular to the width direction.

  The winding drum 50 has a central shaft 52 connected to the output shaft 45 of the winding motor 44 and a winding portion 54 having a larger diameter than the outer diameter of the central shaft 52 and having an outer peripheral surface 51 on which the balance rope 30 is wound. In addition, a plurality of latch teeth 56 provided at a predetermined pitch interval along the circumferential direction of the winding portion 54 are included. In the example of FIG. 2B, the number of latch teeth 56 is 12, and the pitch interval along the circumferential direction between the adjacent latch teeth 56 is 30 degrees in angle. The central shaft 52 and the winding part 54 are formed as an integral structure. Therefore, when the output shaft 45 of the winding motor 44 rotates, the central shaft 52 and the winding portion 54 rotate as a unit. The central shaft 52 protrudes from the end of the winding drum 50 on the mounting member 43 side, and is rotatably held by the mounting member 43 via a bearing 46.

  The latch claw portion 48 that meshes with the latch tooth 56 is a member having a latch claw at the tip, and its root portion is rotatably attached to a fixed position that does not change with respect to the rotation of the winding portion 54. In the example of FIG. 2, it is attached to the bearing 46 of the attachment member 43. The latch teeth 56 and the latch claw portion 48 constitute a latch mechanism, and the winding drum 50 can be rotated only in one direction indicated by an arrow in FIG. 2B, and in the opposite direction, the latch claw portion 48 and the latch claw portion 48 are latched. The winding drum 50 cannot rotate because the teeth 56 are engaged with each other.

  In the example of FIG. 2B, the latch teeth 56 are internal teeth provided inside the winding drum 50, but these may be external teeth provided on the outer peripheral surface of the winding drum 50. In that case, the latch claw portion 48 can be provided on the attachment member 42 or the attachment member 43.

  Returning to FIG. 1, the tension wheel 60 is suspended on a loop portion formed at the lower end of the balance rope 30. The tension vehicle 60 includes a pulley 62 around which the balancing rope 30 is suspended, a housing 64 that rotatably supports the pulley 62, and a cam surface 66 that is provided on one of the side surfaces of the housing 64 along the vertical direction. including. The tension wheel 60 applies a certain tension to the balance rope 30 and suppresses the balance rope 30 from swaying in the hoistway 12.

  A detection stand 68 erected from the pit floor 17 facing the cam surface 66 of the tension vehicle 60 has a limit detection unit 70, a first detection unit 72, and a second detection unit 74 at predetermined positions. It is the board member attached to.

  The limit detection unit 70 is a position detection switch that detects that the tensioning vehicle 60 has descended to a limit position that defines a limit of the height position at which the tensioning vehicle 60 can be lowered based on the pit floor surface. The limit detection unit 70 outputs a low level (L level) signal when the tensioner 60 descends to the limit position. Until then, a high level (H level) signal is output. The signal output from the limit detection unit 70 is transmitted to the control device 90 via the signal line 80 as a limit signal. Since the control device 90 performs processing such as stopping the raising / lowering control of the elevator 10 based on the limit signal, assuming that the raising / lowering stroke of the elevator 10 cannot be sufficiently secured, the limit position indicates the raising / lowering stroke limit position.

  The 1st detection part 72 is a position detection switch which detects that the tension vehicle 60 descend | falls to the 1st position of the predetermined height on the basis of the pit floor surface. The first detection unit 72 outputs a high level signal when the tension wheel 60 descends to the first position. Until then, a low level signal is output. The signal output from the first detection unit 72 is transmitted as a first signal to the control device 90 via the signal line 82. Since the control device 90 instructs the winding motor 44 to start winding driving based on the first signal, the first position indicates the height position of the tension wheel 60 at which winding driving is started.

  The first position is provided at a height position higher than the limit position with respect to the pit floor surface. The limit position is a limit height position at which the tension vehicle 60 can be lowered. When the tension vehicle 60 is lowered to the height of the limit position, processing such as stopping the operation of the elevator 10 is performed. It will cause trouble. Since the first position is higher than the limit position, the first signal is output before processing such as stopping the operation of the elevator 10 is performed. In that sense, the first signal is a forecast signal that informs that the limit position is near, the first position is a forecast position that outputs a forecast signal, and the first detection unit 72 is a forecast detection that outputs a forecast signal. Part.

  The 2nd detection part 74 is a position detection switch which detects that the tension | pulling wheel 60 has moved to the 2nd position of the predetermined height on the basis of the pit floor surface. The second detection unit 74 outputs a high level signal when the tension wheel 60 has moved to the second position. Until then, a low level signal is output. A signal output from the second detection unit 74 is transmitted as a second signal to the control device 90 via the signal line 84. Since the control device 90 instructs the stop of the winding drive when the winding motor 44 has already started the winding driving based on the first signal, the winding motor 44 has already taken up the second position. The height position of the tension vehicle 60 at which the winding drive is stopped when the drive is started is shown.

  The second position is lower than the limit position and higher than the first position by a predetermined height with reference to the pit floor surface. Therefore, when the tensioning wheel 60 descends due to the elongation of the balance rope 30 or the like, it reaches the first position after passing through the second position. When passing through the second position, the second detector 74 outputs a high-level second signal to the control device 90. When the first position is reached, the first detector 72 outputs a high-level first signal to the control device 90, and the control device 90 issues a winding start instruction to the winding motor 44. As a result, the tension vehicle 60 automatically starts to rise.

  When the tensioning vehicle 60 starts to rise, the first detection unit 72 outputs a low-level first signal. However, since the control device 90 does not issue a winding stop instruction, the winding motor 44 continues winding. When the tension vehicle 60 reaches the second position, the second detection unit 74 changes the second signal from the high level to the low level and outputs the second signal to the control device 90. The control device 90 instructs the winding motor 44 to stop winding. Put out. As a result, the ascent of the tension wheel 60 automatically stops. At this time, the length of the balance rope 30 wound around the winding drum 50 is about twice the predetermined height which is the difference between the second position and the first position. Thus, using the outputs of the first detection unit 72 and the second detection unit 74, the balancing rope 30 is automatically wound around the winding drum 50 at a constant length that is approximately twice the predetermined height.

  In the above description, the operation of the control device 90 between the first position and the second position is different when the tension wheel 60 is lowered and when it is raised. That is, the second signal and the first signal between the second position and the first position are both at the high level and the first signal is at the low level both when the signal is descending and when the signal is rising. Nevertheless, the control device 90 does not output a winding instruction to the winding motor 44 when it is lowered, but outputs a winding instruction to the winding motor 44 when it is raised. That is, the winding instruction to the winding motor 44 in the control device 90 is not determined only by the static levels of the first signal and the second signal, but is performed by distinguishing between lowering and rising. Such control is called hysteresis control.

  The winding control unit 94 of the control device 90 in FIG. 1 performs hysteresis control and outputs a winding start instruction and a winding stop instruction to the winding motor 44 based on the first signal and the second signal. The limit signal is used in the operation control unit 92 of the control device 90, but the winding control unit 94 does not use the limit signal. FIG. 3 is a diagram illustrating the contents of the winding control unit 94. The winding control unit 94 includes a hysteresis control circuit 96 and a winding drive circuit 98.

  Schmitt circuits and RS flip-flop circuits are known as circuits used for hysteresis control. Here, an example in which an RS flip-flop circuit is used for the hysteresis control circuit 96 is shown. Since the low level and the high level of the second signal are opposite to the low level and the high level of the reset signal R of the general RS flip-flop circuit, the inverter on the reset terminal side of the general RS flip-flop circuit is used. The circuit configuration is excluded. The reset terminal from which the inverter is removed is called an R hat terminal indicating the inversion of R, and the second signal transmitted through the signal line 84 is called an R hat signal. The set terminal remains the S terminal that is generally passed through, and the first signal transmitted through the signal line 82 is the S signal.

  The winding drive circuit 98 is a circuit that generates a drive signal for the winding motor 44, and the output signal of the hysteresis control circuit 96 is a signal corresponding to the enable signal of the winding drive circuit 98. That is, when the output of the hysteresis control circuit 96 is at a high level, the winding drive circuit 98 outputs a drive signal to the winding motor 44, and when the output of the hysteresis control circuit 96 is at a low level, the winding drive circuit 98 is No drive signal is output to the winding motor 44.

  FIG. 4 is a truth table showing the operation of the hysteresis control circuit 96. There are two input signals, an S signal and an R hat signal, and an output signal is one of the Q signals. The S signal is a first signal, and the R hat signal is a second signal. Each of the S signal, the R hat signal, and the Q signal has a high level of “1” and a low level of “0”.

  As shown in FIG. 4, there are two states where the R hat signal, which is the second signal, is “1”, and when the S signal, which is the first signal, is “0”, the Q signal indicates the state immediately before it. However, when the S signal, which is the first signal, is “1”, the Q signal is “1”. When this is applied to the state change of the tension vehicle 60, the second signal between the second position and the first position is high level and the first signal is low level when the tension vehicle 60 descends and rises. Therefore, the winding control unit 94 instructs the “winding” state to the winding motor 44. That is, when the tension wheel 60 descends from the second position, the winding motor 44 is not yet driven to wind, so the winding motor 44 is not driven between the second position and the first position. When the tension wheel 60 is lifted from the first position, the winding motor 44 has already been driven to wind, so that the winding drive is maintained between the first position and the second position. In this way, hysteresis control for the winding drive is performed.

  The operation of the above configuration will be described in more detail with reference to FIGS. FIG. 5 shows the relationship between the height position of the tension vehicle 60 and the on / off state as the switches of the limit detection unit 70, the first detection unit 72, and the second detection unit 74. FIG. 6 shows the result of FIG. It is a figure which shows the operation | movement in the winding control part 94 using.

  FIG. 5 shows the height position H from the pit floor surface 17 of the tension vehicle 60 when the winding control is performed as time elapses, and the limit detection unit 70, the first detection unit 72, and the second detection unit at that time. It is a figure which shows the change of the ON / OFF state of 74. As time elapses, time t = ta, tb, tc, td, te, and tf are taken, and the states of the tension wheel 60 and the like in each of them are shown in FIGS. The height position of the tension wheel 60 is indicated by the position of the lowermost end of the tension wheel 60. The limit detection unit 70, the first detection unit 72, and the second detection unit 74 are detection switches, and are turned on when the pressing tip of each switch is in contact with the cam surface 66 of the tensioner 60, and are separated from the cam surface 66. Is off. Each detection unit outputs a high level when the corresponding switch is on, and outputs a low level when it is off.

  FIG. 6 is a time chart showing the state change in FIGS. 5A to 5F with time t on the horizontal axis. FIG. 6A is a diagram illustrating a change in the height position over time with the height position H of the tension wheel 60 taken on the vertical axis. FIG. 6B is a diagram showing the change with time of the limit signal, signal S, signal R hat, and signal Q on the vertical axis. Each signal is indicated by “1” and “0”. “1” indicates that each detection unit outputs “high level”, and “0” indicates that each detection unit outputs “low level”.

FIG. 5A is a diagram illustrating a state at time t = ta. At time t = ta, the height position H of the tension vehicle 60 is at a sufficiently high position H _S , and the elevator 10 has a sufficient lifting stroke. The limit detection unit 70 is on, the first detection unit 72 is off, and the second detection unit 74 is off. Correspondingly, in FIG. 6, at time t = ta, the signal S is “0” and the signal R hat is “0”. At this time, as shown in FIG. 4, the signal Q is “0”, and the winding motor 44 is not driven.

FIG. 5B is a diagram showing a state at time t = tb when the tensioning wheel 60 descends from time t = ta and the height position H of the tensioning wheel 60 reaches the second height H ₂ . is there. At time t = tb, the limit detector 70 is in an on state, the first detector 72 is in an off state, and the second detector 74 is in an on state. Correspondingly, in FIG. 6B, at time t = tb, the signal S changes from “0” and the signal R hat changes from “0” to “1”. At this time, as shown in FIG. 4, the signal Q is “0” because it retains the previous state at time t = ta. The winding motor 44 is not driven.

FIG. 5C is a diagram showing a state at time t = tc when the tensioning wheel 60 further descends from time t = tb and the height position H of the tensioning wheel 60 becomes the first position H ₁ . is there. At time t = tc, the limit detection unit 70 is turned on, the first detection unit 72 is changed from the off state to the on state, and the second detection unit 74 is on. Correspondingly, in FIG. 6B, at time t = tc, the signal S changes from “0” to “1”, and the signal R hat remains “1”. At this time, as shown in FIG. 4, the signal Q becomes “1”, and the winding motor 44 starts winding driving.

  When the winding motor 44 performs winding driving, the balancing rope 30 is wound around the winding drum 50, and the tension wheel 60 starts to rise. Accordingly, the first detection unit 72 is immediately turned off, and in response to this, the signal S returns to “0”. As shown in FIG. 6B, the signal S becomes a pulse signal “1” only for a very short time from the time t = tc. Since the signal R hat is “1”, even if the signal S becomes “0”, as shown in FIG. 4, the signal Q maintains the state at the time t = tc, which is the previous state. "". The winding motor 44 continues the winding drive.

  Thus, even when the signal S, which is the first signal, becomes “0”, the winding motor 44 continues the winding drive. Even immediately before t = tc, the signal S as the first signal is “0”. In this case, the winding motor 44 does not perform winding driving. That is, the winding motor 44 starts winding based on the first signal, but just because the first signal is “low level”, the winding motor 44 does not necessarily stop winding.

5 (d) is to increase Chokuruma 60 from the time t = tc, a diagram showing a state when the time the height position H of the Chokuruma 60 has returned to a second height H ₂ t = td is there. At time t = td, the limit detector 70 is turned on, the first detector 72 is turned off, and the second detector 74 is changed from the on state to the off state. Correspondingly, in FIG. 6B, at time t = td, the signal S remains “0”, and the signal R hat changes from “1” to “0”. At this time, as shown in FIG. 4, the signal Q becomes “0”, and the winding motor 44 stops winding. A period from time tc to time td is a winding drive period for the winding motor 44.

  As shown in FIG. 6B, the signal R hat remains “1” between the time t = tb and the time t = td. The signal Q between time t = tb and time t = tc is “0”, but the signal Q between time t = tc and time t = td is “1”. That is, even if the signal R hat is “1”, the winding motor 44 may be driven to wind, not in a state where winding is stopped. That is, the winding motor 44 that has already started winding stops winding based on the second signal, but the winding motor 44 does not necessarily stop winding because the second signal is “high level”. .

FIG. 5E is a diagram showing a state when time t = te has elapsed since time t = td. When the winding motor 44 stops winding at time t = td, the tensioning wheel 60 does not rise, so that the state of the second height H ₂ is maintained in the subsequent time. Therefore, the height position of the tension wheel 60 at time t = te and the on / off state of each detection unit do not change from time t = td. The limit detection unit 70 remains on, the first detection unit 72 remains off, and the second detection unit 74 remains off. Correspondingly, in FIG. 6B, at time t = te, the signal S remains “0” and the signal R hat remains “0”. Therefore, the signal Q remains “0” and the winding motor 44 is in a state where the winding is stopped. The balancing rope 30 wound around the winding drum 50 is not rewound by the action of the latch mechanism.

FIG. 5 (f) is a diagram showing a state where an abnormal situation occurs, the tension vehicle 60 suddenly descends, and the height position of the tension vehicle 60 reaches the limit position H _L at time t = tf. The limit detection unit 70 changes suddenly from the on state to the off state, the first detection unit 72 is in the on state, and the second detection unit 74 is in the on state. Correspondingly, in FIG. 6B, the limit signal, which is a signal detected by the limit detection unit 70, suddenly changes from “1” to “0”. The signal S and the signal R hat also change suddenly from “0” to “1”, but the winding control unit 94 of the control device 90 cannot follow the rapid state change because of the time delay. In the meantime, the operation control unit 92 of the control device 90 that has acquired that the limit signal is “0” stops the operation of the elevator 10 assuming that the elevator 10 is short in the ascending / descending stroke. Thereby, the signal S, the signal R hat, and the limit signal are invalidated.

As indicated by the state change from the time t = ta to the time t = tf, even when the tension wheel 60 is lowered, the height position H is lowered to the first position H ₁ before being lowered to the limit position H _L. At that time, the balancing rope 30 is wound on the winding drum 50. Then, the height position of the Chokuruma 60 rises to the height of the second position H _2. Thus, even if the tension wheel 60 descends, its height position only moves up and down between the second position and the first position.

According to the above configuration, the process of winding the balancing rope 30 around the winding drum 50 by the action of the first detection unit 72 and the second detection unit 74 before the height position of the tension wheel 60 reaches the limit position H _L. Is done. The height position of the tension vehicle 60 becomes the limit position H _{L only} in an abnormal situation such as the tension vehicle 60 suddenly descending to the extent that there is no time for the first detection unit 72 and the second detection unit 74 to operate. . In such an abnormal situation, operation stop processing of the elevator 10 is performed by the operation control unit 92 of the control device 90, and a response to the abnormal situation is awaited.

  In the above description, the winding start and the winding stop are performed based on the first signal and the second signal output from the first detection unit 72 and the second detection unit 74, respectively. Instead, the winding start is performed based on the first signal output from the first detection unit 72 without using the second signal, and the winding is stopped when the predetermined winding is completed from the winding start. It may be a thing. As an example, the winding control unit 94 uses a timer circuit instead of the hysteresis control circuit 96. The timer circuit starts timing the timer when acquiring the first signal and outputs a signal related to the start of winding to the winding drive circuit 98. Then, when the preset timer time has expired, a signal relating to winding stop is output to the winding drive circuit 98. Accordingly, the balance rope 30 can be wound around the winding drum 50 with a predetermined winding length without performing hysteresis control.

  Alternatively, a stepping motor may be used as the winding motor 44, and control to drive the winding motor 44 by a predetermined number of steps determined in advance from acquisition of the first signal may be performed. In addition, a predetermined winding length can be obtained by providing a latch detection unit that detects the operation of the latch claw portion 48 in the latch mechanism and counting the number of times the latch claw portion 48 is engaged with the latch teeth 56. In this case, the pitch interval for the plurality of latch teeth 56 provided on the take-up drum 50 is taken as a take-up unit, the first signal is acquired and the take-up drive is started, and the take-up drum 50 is moved by a predetermined take-up unit. The winding drive is stopped by rotating.

  Even when the winding is stopped based on the second signal, the meshing state between the latch claw portion 48 and the latch tooth 56 is unstable, so that the meshing state is always settled. In that sense, even when the winding stop is performed based on the second signal, the first signal is acquired to start the winding drive, and the winding drum 50 is wound by a predetermined winding unit related to the timing of the second signal. To stop the winding drive.

  10 (balance rope type) elevator, 12 hoistway, 14 machine room, 16 pit, 17 pit floor, 18 1st floor landing floor, 19 top floor landing floor, 20 passenger car, 21 (bottom of car) outer bottom surface , 22 Counter weight, 24 Main rope, 26 Hoisting machine (drive device), 30 Balance rope, 40 Winding mechanism, 42, 43 Mounting member, 44 Winding motor, 45 Output shaft, 46 Bearing, 48 Latch claw , 50 winding drum, 51 outer peripheral surface, 52 central shaft, 54 winding portion, 56 latch tooth, 60 tension wheel, 62 pulley, 64 housing, 66 cam surface, 68 detection stand, 70 limit detection portion, 72 first Detection unit, 74 Second detection unit, 80, 82, 84, 86 Signal line, 90 control device, 92 operation control unit, 94 winding control unit, 96 hysteresis control circuit, 98 winding drive circuit

Claims (6)

A main rope that is driven and driven in the hoistway by the driving device;
A car suspended from one end of the main rope
A counter weight suspended and connected to the other end of the main rope;
A balancing rope connected to the lower end side of the car and the lower end side of the counter weight, and balancing the car side mass and the counter weight side mass of the main rope;
A tension wheel suspended on a loop formed at the lower end of the balance rope;
A winding drum which is provided at the end of the balancing rope on the side of the car and can rotate in one direction in the winding direction of the balancing rope;
A winding motor that rotationally drives the winding drum;
A balanced rope type elevator characterized by comprising: In the balanced rope elevator according to claim 1,
The winding drum
A central shaft connected to the output shaft of the winding motor;
A winding portion having an outer diameter that is larger than the outer diameter of the central shaft and on which the balance rope is wound;
A plurality of latch teeth provided at predetermined pitch intervals along the circumferential direction of the winding portion;
Including
A balancing claw that is provided with a latch claw portion that engages with a latch tooth on a mounting member that attaches the center shaft of the winding drum and the winding motor to the car and restricts the rotation direction of the winding drum in one direction. Rope type elevator. In the balanced rope elevator according to claim 2,
A first detection unit that detects that the height position of the tension vehicle with respect to the pit floor, which is the bottom of the hoistway, has dropped to a predetermined first position and outputs a first signal;
The take-up motor starts a take-up drive of the take-up drum based on the first signal and stops the take-up drive when a predetermined take-up is completed. In the balanced rope type elevator according to claim 3,
Detecting that the height position of the tension vehicle has risen from the first position to the second position, with the height position of the tension vehicle being higher than the first position by a predetermined height from the pit floor surface as the second position. A second detector for outputting a second signal;
The take-up motor stops the take-up drive based on the second signal. In the balanced rope type elevator according to claim 3,
The winding motor
Using a predetermined pitch interval for a plurality of latch teeth provided on the winding drum as a winding unit, the first signal is acquired to start winding driving, and the winding drum is rotated by a predetermined winding unit to wind the winding drum. A balanced rope type elevator characterized by stopping driving. In the balance rope type elevator according to any one of claims 2 to 5,
The first position is
A balanced rope type elevator characterized by being higher than a limit position determined as a limit of a height position at which the tensioned vehicle can descend with respect to the pit floor surface.

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