JP2006008348A - Elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an elevator capable of accurately landing an elevator car in a destination floor without hindering comfortableness even if rope creep is generated in the elevator. <P>SOLUTION: When a distance X between a floor, in which the elevator car 1 is stopped at present, and a destination floor as a floor, in which a call is registered, is a certain value or more, an elevator control board 8 computes rope creep quantity Y on the basis of the distance X, large or small, and operating direction of the elevator car 1, upward or downward, and load capacity of the elevator car 1, large or small, and intensity of tension of a wire rope 4. The elevator control board 8 generates a travelling pattern corresponding to the number of pulse P computed on the basis of the distance obtained by adding/subtracting the rope creep quantity to/from the travelling distance X, and controls travelling till the number of integrated pulse becomes the number of pulse P by following the travelling pattern. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an elevator installed in, for example, a high-rise building.

  Conventionally, in a rope-type elevator, a car and a counterweight are connected by a wire rope and wound around a sheave. A hoisting machine transmits a rotational force to the sheave to raise and lower the car and raise and lower the car. Car position control and speed control are performed by generating pulse signals proportional to the distance and calculating the car position by integrating and counting the pulse signals.

In general, a slip is generated between the wire rope and the sheave, and the slip becomes larger as the raising / lowering distance of the car becomes longer. Due to the effect of such slip, so-called rope creep occurs in which the actual car position differs from the car position measured based on the pulse signal. When the influence of the rope creep is great, the car cannot be accurately landed at a position where the door can be opened on the destination floor. To solve this problem, for example, as disclosed in Patent Document 1, A technique has been used in which a floor at a position is detected and the accumulated count of the number of pulses is corrected using a reference pulse number corresponding to the detected floor.
JP-A-9-52669

  In the method described above, the floor where the car is located is detected, and the pulse signal count is corrected using the reference pulse data corresponding to this floor, but errors due to rope creep are taken into account. Since the car is moved up and down according to the running pattern and the number of pulses is corrected for each floor, speed control when landing the car on the target floor may not be performed smoothly, and passenger comfort Had a bad influence.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide an elevator capable of correctly landing a car on a destination floor without impairing riding comfort even when rope creep occurs.

  That is, the elevator according to the present invention detects the current position of the car, calculates the distance from the detected current position to the landing position of the destination floor, and loads the car, driving direction of the car, and Based on at least one of the elongation characteristics of the wire rope and the distance from the current position to the landing position of the destination floor, a correction value is calculated so as not to cause an error in the landing position of the car. The vehicle is controlled to move up and down to the landing position on the destination floor according to the travel pattern determined based on the distance from the current position to the landing position on the destination floor and the correction value.

  In the elevator according to the present invention, the landing of the car is based on at least one of the loading capacity of the car, the driving direction of the car, the elongation characteristic of the wire rope, and the distance calculated by the distance calculating means. Since the correction value is calculated so that the position error does not occur, even when rope creep occurs, the car can be smoothly and correctly landed on the destination floor.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
First, an embodiment of the present invention will be described.
FIG. 1 is a block diagram illustrating a configuration example of an elevator according to an embodiment of the present invention.
This elevator is provided in a building such as a high-rise building, and a car 1 is connected to a counterweight 5 via a wire rope 4 wound around a sheave 3 provided on a motor shaft of a motor (winding machine) 2. Connected. As the sheave 3 is rotated by driving the motor 2, the car 1 moves up and down in the hoistway 6 together with the counterweight 5 in the up and down direction by the frictional force between the sheave 3 and the wire rope 4. In addition, a pulse generator (PG) 7 that detects the shaft rotation of the motor 2 and generates a number of pulse signals proportional to the rotation angle is installed at the upper part of the hoistway 6.

  The elevator control panel 8 counts up and down the pulse signal generated by the pulse generator 7, detects the position in the hoistway 6 of the car 1 based on the number of accumulated pulses obtained as a result of the counting, and Take control.

  A load sensor 10 connected to the elevator control panel 8 via a tail cord 9 is provided at the lower part of the car 1. The load sensor 10 always measures the load amount of the car 1 and outputs a control signal indicating information on the measured load amount to the elevator control panel 8. Each floor of the hoistway 6 is provided with an absolute position detection plate 11 for detecting the passing and landing of the car 1.

  An absolute position switch 12 is provided on the side surface of the car 1. The absolute position detection plate 11 of each floor includes the identification information of the floor on which the absolute position detection plate 11 is provided by detecting when the absolute position switch 12 is close to the installation position of the absolute position detection plate 11. A control signal is output to the elevator control panel 8. The elevator control panel 8 receives the control signal from the absolute position detection plate 11 and detects the floor where the car 1 is currently located by discriminating the floor information included in this control signal.

  When the absolute position switch 12 of the car 1 is close to the installation position of the absolute position detecting plate 11 on the destination floor, the elevator control panel 8 can open the car door and the hold door (not shown). .

Next, the raising / lowering operation | movement of the elevator car by the elevator of the structure shown in FIG. 1 is demonstrated according to the flowchart shown in FIG.
When the car 1 is landing on any one of the floors, the absolute position switch 12 of the car 1 is close to any one of the absolute position detecting plates 11 of the floors. The elevator control panel 8 inputs a control signal from the absolute position detection plate 11 indicating that the absolute position switch 12 has approached, and the car 1 is connected to each floor based on the floor information included in the control signal. Detect which of the floors you are landing on.

  When the hall call or car call is registered, the elevator control panel 8 moves between the floor where the car 1 is currently located and the landing position of the destination floor which is the call registered floor. The distance X is calculated (step S1). Specifically, a distance calculation table (not shown) that defines the distance between the floors is stored in advance in the memory 8a in the elevator control panel 8, and the elevator control panel 8 is connected to the current floor. The distance X is calculated by collating the information on the floor of the destination floor with the distance calculation table.

  The elevator control panel 8 determines whether or not the distance X from the current position calculated in this way to the landing position of the destination floor is a certain distance (for example, 25 meters or more) (step S2). This fixed distance is a lower limit value of the distance that can cause a large landing error due to rope creep before the car 1 moves up and down toward the destination floor.

  The rope creep is an error between the actual car position and the car position measured based on the pulse signal from the pulse generator 7 due to the effect of slip generated between the wire rope 4 and the sheave 3.

  Significant landing error due to rope creep means that when the car 1 moves up and down toward the target floor according to the call and the car 1 stops according to the number of accumulated pulses of the pulse signal generated by the pulse generator 7, The error is such that the absolute position detection switch 12 of the car 1 is not close to the installation position of the absolute position detection plate 11 on the target floor due to the effect of rope creep, and the door opening operation is not performed. The elevator according to this embodiment has a function of performing control to prevent such landing errors in advance.

  If “YES” is determined in the process of step S2, the elevator control panel 8 calculates the rope creep amount Y generated when the car 1 travels the distance X according to the following equation (1). (Step S3). On the other hand, if “NO” is determined in the process of step S2, normal elevation control and landing control are performed.

Y = B * X Formula (1)
B in equation (1) is a constant and is determined by the size of the distance X, the vertical direction of the car 1, the magnitude of the loading capacity of the car 1, and the coefficient of elongation characteristics of the wire rope 4.
In determining the constant B, the elevator control panel 8 first determines the up and down directions of the driving direction based on the relationship between the call registered destination floor and the current floor, and the control signal output by the load sensor 10. Is obtained from the rope creep calculation table (see FIG. 3) stored in advance in the memory 8a in the elevator control panel 8 to obtain a coefficient relating to the elongation characteristic of the wire rope 4. get. This coefficient is a parameter of the tension of the wire rope 4.

  For example, when the travel distance X is between “0” and “X1”, the loading amount is between “0” and “M1”, the ascending / descending direction is “rise”, and the coefficient of the wire rope 4 is “C”. In some cases, the elevator control panel 8 determines “B1” as the constant B in the equation (1) according to the table shown in FIG.

  Next, the elevator control panel 8 calculates a distance XA obtained by adding or subtracting the value of the rope creep amount Y to the value of the travel distance X calculated in the process of step S1 (step S4). Then, the elevator control panel 8 calculates the number of pulses P based on the distance XA calculated in the process of step S4. The pulse number P is a pulse number calculated so that when the car 1 moves up and down, the landing position error due to rope creep does not occur when the car 1 moves up and down to the destination floor.

  The elevator control panel 8 generates a traveling pattern corresponding to the number of pulses P, and performs elevation control until the accumulated number of pulses of the pulse signal generated by the pulse generator 7 reaches the number of pulses P while following the traveling pattern. Perform (step S5). In the traveling pattern, an acceleration time after the car 1 starts to move up and down, an acceleration, a traveling time based on a rated speed, and a time until the landing after decelerating are defined.

  After the processing in step S5, the elevator control panel 8 performs landing control using the absolute position detection plate 11 on the destination floor (step S6). In other words, because the travel pattern considering the effect of rope creep is generated in advance before the start of lifting, the lifting control is performed, so even if rope creep occurs, for example, unnatural speed control is not performed immediately before landing The car can be properly and smoothly landed on the destination floor.

  In the embodiment described above, the rope creep amount Y at the travel distance X of one of the cars is calculated, the distance XA obtained by adding / subtracting the rope creep amount Y to / from the travel distance X is obtained, and the number of pulses calculated based on this distance XA Although the travel pattern corresponding to P is generated, the present invention is not limited to this. For example, if the car 1 is moved up and down according to the travel pattern generated in consideration of the rope creep amount Y, for example, the travel distance X is used. After calculating the number of pulses, a correction pulse number using the rope creep amount Y, which is a correction amount of the travel distance X, as a travel distance may be calculated, and a travel pattern corresponding to the sum of these pulse numbers may be generated. .

  Further, since the coefficient C of the wire rope 4 changes with time, if the elevator operation period is long, the calculated value of the rope creep amount Y when the car 1 travels the distance X and the actual rope creep amount An error will occur. In the elevator according to the present embodiment, a test operation is periodically performed so that correct landing on the destination floor of the car 1 can always be performed, and the number of accumulated pulses in each floor by this test operation is shown in FIG. Various parameters in the table shown in (5) can be updated.

Next, a modification of the embodiment of the present invention will be described.
This modification assumes the case where an elevator is installed in a building such as a skyscraper and the traveling distance of the car 1 is long.
When the lift distance of the car 1 is extremely long, even if the rope creep amount is calculated using the table defined as shown in FIG. 3, the actual rope creep is affected by, for example, the influence of strong wind vibration. An error from the quantity may occur. This modification solves the above-mentioned problems.

FIG. 4 is a flowchart showing an example of the procedure of the processing operation by the elevator according to the modification of the embodiment of the present invention.
First, the elevator control panel 8 calculates the distance D between the floor where the car 1 is currently located and the destination floor that is the registered floor as in the process of step S1 described above. (Step A1). It is assumed that the distance D exceeds the lower limit value of the distance that can cause a significant landing error due to rope creep until the car 1 moves up and down toward the destination floor as described above.

  The elevator control panel 8 determines whether or not the distance D calculated in the process of Step A1 exceeds a predetermined reference value (constant value) W (for example, 50 meters) (Step A2). In this modification, the rope creep calculation table is substantially the same as the configuration shown in FIG. 3, and is a table for calculating the rope creep amount based on the distance to the reference value W.

  If it is determined as “YES” as a result of the process of step A2, the elevator control panel 8 performs the division of the distance D and the reference value W to obtain the quotient (N) and the remainder (α) (step). A3). The value of N corresponds to the number of corrections for travel control according to the amount of rope creep, and the value of α is from the current position of the car 1 after the travel control is corrected N times to the landing position on the destination floor. Corresponds to the remaining distance. On the other hand, if “NO” is determined in the process of step A2, normal elevation control and landing control are performed.

  Next, the elevator control panel 8 sets the value of the coefficient n stored in the memory 8a to “0”, which is an initial value (step A4). The coefficient n is the count value of the number of corrections N described above, and varies between “0” and “N”. Then, the elevator control panel 8 updates the value of the coefficient n stored in the memory 8a by adding 1 (step A5).

  The elevator control panel 8 calculates the value of the rope creep amount YW using the reference value W described above as the travel distance of the car 1 according to the equation (1) (step A6). Here, the constant B in the equation (1) is determined according to the above and below the driving direction, the loading amount, and the coefficient of the wire rope 4 in addition to the reference value W of the travel distance. Then, the elevator control panel 8 calculates the value of the distance XB obtained by adding or subtracting the value of the rope creep amount YW to the value of the total travel distance D of the car 1 (step A7).

The elevator control panel 8 calculates the number of pulses PB corresponding to the distance XB calculated in step A7, generates a traveling pattern corresponding to the number of pulses PB, and follows this traveling pattern. The elevator 1 is controlled to move up and down (step A8).
When the elevator 1 is moved up and down by the process of step A8, and the absolute position detection plate 11 and the absolute position switch 12 detect that the lifted distance has become the reference value W, the elevator control panel 8 If there is an error between the reference pulse number corresponding to the installation position of the position detection plate 11 and the accumulated pulse number of the pulse signal generated by the pulse generator 7, this is reflected in the accumulated pulse number. Then, the elevator control panel 8 determines whether or not the value of the coefficient n stored in the memory 8a is “N” (step A9).

  If it is determined as “NO” as a result of the process of step A9, that is, if the correction of the travel control for N times calculated in the process of step A3 is not completed, the process returns to the process of step A5. In this case, the elevator control panel 8 updates the value of the coefficient n stored in the memory 8a by adding 1 and updates the value of the rope creep amount YW calculated as described above to the total lift distance D and the lifted distance. After reflecting the difference in distance, that is, the remaining distance from the current position of the car 1 to the landing position of the destination floor, the traveling pattern is corrected according to the number of pulses corresponding to the reflected distance, thereby performing the lifting control. Will continue.

  On the other hand, when “YES” is determined in the process of step A9, that is, when the correction of the travel control for N times calculated in the process of step A3 has been completed, the elevator control panel 8 determines the distance α from the current position. Subsequently, the car 1 is continuously raised and lowered, and landing control is performed using the absolute position detection plate 11 on the destination floor (step A10).

  Therefore, even if the total travel distance of the car 1 to the destination floor is remarkably long and the travel control based on the number of pulses corresponding to this distance cannot be performed, the landing control on the destination floor when the rope creep occurs. Can be performed smoothly and accurately.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Moreover, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

The block diagram which shows the structural example of the elevator according to embodiment of this invention. The flowchart which shows an example of the procedure of the processing operation of the elevator shown in FIG. The figure which shows an example of the table for calculation of the amount of rope creep memorize | stored in the memory of the elevator control panel shown in FIG. The flowchart which shows an example of the procedure of the processing operation by the elevator according to the modification of embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Riding car, 2 ... Motor (winding machine), 3 ... Sheave, 4 ... Wire rope, 5 ... Counterweight, 6 ... Hoistway, 7 ... Pulse generator (PG), 8 ... Elevator control panel, 8a ... Memory , 9 ... Tail cord, 10 ... Load sensor, 11 ... Absolute position detection plate, 12 ... Absolute position switch.

Claims (2)

Position detecting means for detecting the current position of the car;
Distance calculating means for calculating the distance from the detected current position to the landing position of the destination floor;
An error in the landing position of the car based on at least one of the loading capacity of the car, the driving direction of the car, and the elongation characteristics of the wire rope, and the distance calculated by the distance calculation means. Correction value calculation means for calculating the correction value of the calculated distance such that does not occur,
Control for determining a travel pattern of the car based on the distance value calculated by the distance calculation means and the correction value, and performing control for raising and lowering the car to the landing position on the destination floor according to the travel pattern And an elevator. The correction value calculation means includes
When the distance is calculated by the distance calculation means and the calculated distance exceeds a predetermined distance, the loading amount of the car, the driving direction of the car, and the elongation of the wire rope Calculating a correction value for the calculated distance based on at least one of the characteristics and the predetermined distance;
The distance calculation means includes
Each time the position detecting means detects that the car has moved up and down over the predetermined distance according to a travel pattern determined based on the value of the distance from the current position to the landing position of the destination floor and the correction value. The elevator according to claim 1, wherein a distance from the current position of the car to the landing position of the destination floor is newly calculated.

Images