Elevator

Abstract

To provide an elevator capable of measuring the magnitude of displacement of a governor rope.SOLUTION: An elevator 10 includes a speed governing device 30 that detects an overspeed of a car 26 by using a speed governing rope 36 that is stretched between a speed governing sheave 32 (see FIG. 1) and a tension sheave 34 (see FIG. 1) and is connected to the car 26 (see FIG. 1) that moves up and down via a connecting part 26A so as to move up and down in conjunction with the car 26. This device is provided with a range measuring sensor 50 for measuring a position in a preset vertical directional position of a car upper side governor rope 36A part, and a positional dislocation detecting part 46 for calculating the size of positional dislocation of the governor rope 36A part on the basis of the position of the car upper side governor rope 36A part detected via the range measuring sensor 50 when a car 26 is positioned in a different vertical directional position.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to an elevator, and more particularly to an elevator equipped with a speed governor that uses a governor rope to detect overspeed of a car. [Background technology]

[0002] The elevator is provided with a speed governor that detects an abnormal increase in the ascending or descending speed of the car and applies a braking force to stop the car, and also activates an emergency stop device for the car if the car does not stop even when the braking force is applied.

[0003] This speed governor is configured, for example, so that a governor rope, which is stretched endlessly between a governor sheave installed directly above the hoistway and a tensioner installed in the hoistway pit, is connected to the car via a connecting part.The governor rope rises and falls in conjunction with the rising and falling speed of the car, thereby detecting the rising and falling speed of the car.

[0004] Patent Document 1 discloses an elevator having a governor that detects the ascending and descending speed of the car by connecting a governor rope to the car that ascends and descends in the elevator shaft and using a governor sheave that is configured to rotate in conjunction with the ascending and descending of the car via this governor rope. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2002-179361 Summary of the Invention [Problem to be solved by the invention]

[0006] The governor rope is connected to a connector midway between the governor sheave and the tension wheel, and the position of the connector that connects the car and the governor rope may be slightly misaligned with the governor sheave and tension wheel in a plan view. In such cases, the position of the governor rope in the horizontal direction will also fluctuate as the car rises and falls (hereinafter referred to as "governor rope misalignment").

[0007] If the misalignment of the connector exceeds the allowable range, it becomes necessary to adjust the position of the governor rope hanging down in the hoistway by adjusting the attachment position of the connector, etc. However, the elevator described in Patent Document 1 has a problem in that it is not possible to measure the magnitude of the governor rope misalignment.

[0008] An object of the present invention is to provide an elevator capable of measuring the magnitude of positional deviation of a governor rope. [Means for solving the problem]

[0009] The elevator of the present invention is an elevator equipped with a speed governor that detects overspeed of a car using a governor rope that is spanned between a governor sheave and a tension wheel and is connected via a connecting part to the car that moves up and down in the elevator shaft, thereby being configured to rise and fall in conjunction with the car, and is equipped with a rope position detection unit that measures the position of the governor rope at a predetermined vertical position, and a position deviation detection unit that calculates the magnitude of the position deviation of the governor rope based on the position of the governor rope detected via the rope position detection unit when the car is located at a different vertical position.

[0010] In the elevator of the present invention, the position deviation detection unit may be configured to determine an abnormality when the magnitude of the position deviation of the governor rope is equal to or greater than a predetermined value.

[0011] The elevator of the present invention may further include a correction value calculation unit that calculates a correction value required to correct a positional deviation based on the magnitude of the positional deviation of the governor rope calculated by the positional deviation detection unit. [Effects of the Invention]

[0012] According to the elevator of the present invention, the magnitude of the positional deviation of the governor rope can be measured based on the position of the governor rope at predetermined vertical positions measured when the elevator car is stopped at different vertical positions. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 1 is a diagram showing a schematic configuration of an elevator according to this embodiment. [Figure 2] FIG. 2 is a block diagram showing the relationship of a control system centered on a control device for determining an abnormality due to a positional deviation of the governor rope in the elevator of this embodiment. [Figure 3] Figure 3(a) is a diagram showing the arrangement of the governor rope when the car shown in Figure 1 is stopped at a lower landing, and Figure 3(b) is a diagram showing the arrangement of the governor rope when the car shown in Figure 1 is stopped at an upper landing. [Figure 4] Figure 4(a) is a diagram showing the geometric positional relationship of each part when the elevator shown in Figure 3(a) is located relatively on the lower floor side, and Figure 4(b) is a diagram showing the geometric positional relationship of each part when the elevator shown in Figure 3(b) is located relatively on the upper floor side. DETAILED DESCRIPTION OF THE INVENTION

[0014] An elevator 10 according to one embodiment of the present invention will be described below with reference to the drawings. Note that the scales of the components in each drawing are not necessarily uniform. In each drawing, the horizontal direction perpendicular to the axial direction of the sheave 14A is indicated as horizontal direction X, the horizontal direction perpendicular to horizontal direction X is indicated as horizontal direction Y, and the vertical direction is indicated as up-down direction Z.

[0015] Fig. 1 is a schematic diagram showing the overall configuration of an elevator 10. As shown in Fig. 1, elevator 10 is a rope elevator that uses a traction system as its drive system, and is installed in a machine room M directly above a hoistway 12. Elevator 10 is equipped with a hoisting machine 14 in the machine room M. This hoisting machine 14 includes a sheave 14A and an electric motor 14B that drives sheave 14A. A main rope 16 is stretched across sheave 14A, and a car 26 is suspended from one end of this main rope 16, and a counterweight 24 is suspended from the other end.

[0016] The elevator 10 also includes a speed governor 30 that detects excessive speed of the car 26 (in other words, excessive upward and downward speed of the car 26). The speed governor 30 includes a governor sheave 32 installed in the machine room M, a tension sheave 34 installed in the pit (bottom) 12P of the hoistway 12, and a governor rope 36 that is endlessly stretched between the sheaves 32, 34. The tension sheave 34 has the function of applying tension to the governor rope 36 to prevent it from slackening.

[0017] The governor rope 36 is connected to the car 26 via a connecting portion 26A attached to the car 26, and the governor rope 36 also moves up and down in conjunction with the up and down movement of the car 26. Then, in conjunction with the up and down movement of the governor rope 36, the governor sheave 32 around which the governor rope 36 is stretched rotates.

[0018] The speed governor 30 has the function of sending a stop signal to the control device 40 when the ascending / descending speed of the car 26 increases abnormally and the rotational speed of the governor sheave 32 reaches a predetermined first speed limit, and of activating an emergency stop device (not shown) installed on the car 26 when the rotational speed of the governor sheave 32 reaches a second speed limit that is higher than the first speed limit.

[0019] As shown in FIG. 1, the machine room M also includes a control device 40 that performs overall control of the operation of the elevator 10. FIG. 2 is a block diagram showing the relationship of a control system centered around the control device 40. As shown in FIG. 2, the control device 40 includes a memory unit 42, which is composed of a ROM, a RAM, an HDD, and the like, in which various control programs are stored. A CPU reads the programs from the memory unit 42 and performs arithmetic processing to function as an operation control unit 44, a position deviation detection unit 46 that detects a position deviation of the governor rope 36, and a correction value calculation unit 48 that calculates a correction value required to correct the position deviation based on the magnitude of the position deviation of the governor rope 36 calculated by the position deviation detection unit 46. The memory unit 42 also stores the vertical position of the car 26 when measuring positions P1 and P2, which will be described later.

[0020] The operation control unit 44 has a normal operation mode in which it controls the drive of the hoisting machine 14 based on a destination floor operation input via a car operation panel (not shown) installed in the car 26 or a hall operation panel (not shown) installed at the hall. Here, the positional deviation of the governor rope 36 means the amount of displacement of the rope 36 in the horizontal direction X and the horizontal direction Y.

[0021] The elevator 10 is provided with a range sensor (rope position detection unit) 50 (see FIGS. 3(a) and 3(b)) on the wall surface of the hoistway 12, which transmits position information of the governor rope 36 to the control device 40. This range sensor 50 is provided on the wall surface of the hoistway 12, outside the ascent and descent path of the car 26 and counterweight 28. It is preferable to install the range sensor 50 in the center of the hoistway 12, i.e., at a position where the vertical distance from the pit 12P is approximately half the total vertical length AL of the hoistway 12 (see FIG. 1).

[0022] This range sensor 50 has the function of measuring the distance and direction to an object located on a horizontal plane including its installation position and outputting the measured distance and direction as two-dimensional position data. Here, the horizontal plane will also be referred to as the "scanning plane" as appropriate. The range sensor 50 is a known two-dimensional range sensor (laser range scanner) that measures the distance from the installation position of the range sensor 50 to an object by emitting laser light at predetermined angular intervals (e.g., 0.125 degrees) to scan the horizontal plane in a fan shape, measuring the time it takes for each emitted laser light to travel to and from the object and converting the time into distance, using a time-of-flight method. The time per scan (scanning time) is, for example, 25 msec, and the number of scans per second is 40.

[0023] Next, a method for detecting a positional deviation of the governor rope 36 will be described with reference to Figures 3(a) and 3(b). Because the method for calculating the positional deviation of the governor rope 36 in both the horizontal direction X and the horizontal direction Y is similar, the following description will mainly focus on an example of a method for calculating the positional deviation in the horizontal direction X, and will omit a description of the method for calculating the positional deviation in the horizontal direction Y as appropriate.

[0024] Figures 3(a) and 3(b) are diagrams showing the arrangement of the governor rope 36 when the connecting portion 26A of the car 26 is located below the vertical position of the range sensor 50, with Figure 3(a) showing the installed state of the governor rope 36 when the car 26 is located relatively on the lower floor side, and Figure 3(b) showing the installed state of the governor rope 36 when the car 26 is located relatively on the upper floor side.

[0025] 3(a) and 3(b), the portion of the governor rope 36 that departs from the governor sheave 32 and reaches the connecting portion 26A of the car 26 is referred to as the car upper governor rope 36A, and the portion that extends from the connecting portion 26A of the car 26 to the tension sheave 34 is referred to as the car lower governor rope 36B. In this embodiment, the position of the car upper governor rope 36A when the car 26 is at different vertical positions is measured by the range sensor 50, and the magnitude of the positional deviation is detected via the positional deviation detection unit 46.

[0026] As shown in Figures 3(a) and 3(b), the position of the car upper governor rope 36A on the scanning plane of the range sensor 50 displaces (shifts) from position P1 to position P2 as the vertical position of the car 26 changes from the lower floor to the upper floor.

[0027] Here, the position deviation detection unit 46 calculates the coordinates (Px1, Py1) of the position P1 and the coordinates (Px2, Py2) of the position P2 of the car upper governor rope 36A based on the two-dimensional position data output from the range sensor 50 described above.

[0028] Fig. 4(a) is a diagram showing the geometric positional relationship of each part when the car 26 shown in Fig. 3(a) is located relatively on the lower floor side. In Fig. 4(a), the tension sheave 34 is located vertically below the governor sheave 32, and the dashed line represents an imaginary line V extending vertically downward from the detachment position R1 where the upper car governor rope 36A detaches from the governor sheave 32. The distance from the detachment position R1 to the scanning plane of the range sensor 50 is represented by L0.

[0029] 4(a), the distance from the release position R1 to the coupling portion 26A is defined as distance L1, the intersection of the scanning plane of the range sensor 50 and the virtual line V is defined as position P0, and the coordinates of position P0 are defined as (Px0, Py0). When the difference between position P1 and position P0 on the scanning plane of the car upper governor rope 36A, in other words the difference between Px1 and Px0, is defined as distance D1, the relationship of the following formula (1) is established.

[0030]

number

[0031] Similarly, Fig. 4(b) is a diagram showing the geometric positional relationship of each part when the car 26 shown in Fig. 3(b) is located relatively on the upper floor side. In Fig. 4(b), the tension sheave 34 is located vertically below the governor sheave 32, and the dashed line represents an imaginary line V extending vertically downward from the detachment position R1 where the governor rope 36 detaches from the governor sheave 32. The distance from the detachment position R1 to the scanning plane of the range sensor 50 is also represented by L0.

[0032] As shown in Figure 4(b), if the distance from the release position R1 to the connecting portion 26A is distance L2, the intersection of the virtual line V on the scanning plane of the range sensor 50 is position P2 and the coordinates of position P2 are (Px2, Py2), and the difference between position P2 and position P0 on the scanning plane of the car upper governor rope 36A, in other words, the difference between Px2 and Px0, is distance D2, then the relationship shown in equation (2) below holds.

[0033]

number

[0034]

number

[0035]

number

[0036] Similarly, the positional deviation detection unit 46 also calculates the distance L2 based on the vertical position of the car 26 when measuring the departure position R1 and the position P2. Then, the positional deviation detection unit 46 calculates the distance Dx using the above formula (4), and performs an abnormality determination if the distance Dx is equal to or greater than a preset allowable value (predetermined value).

[0037] When an abnormality is determined via the positional deviation detection unit 46, the control unit 40 preferably turns on a lamp provided in the control unit 40 to notify the occurrence of an abnormality. This allows a maintenance person to be notified that an abnormality has occurred. Furthermore, when the above-described abnormality determination is made, the control unit 40 may record information that an abnormality determination has been made in an operation log stored in the storage unit 42, together with, for example, the date and time of the abnormality occurrence. In this case, whether or not an abnormality has occurred can be confirmed by checking the operation log during maintenance and inspection, etc.

[0038] Furthermore, when an abnormality is determined, the control device 40 may be configured to notify a management center or the like of the abnormality determination via communication means such as the Internet. This allows for prompt inspection and confirmation of the installation condition of the speed governor 30. Furthermore, the control device 40 may be configured to stop the normal operation mode when an abnormality is determined.

[0039] The correction value calculation unit 48 calculates a correction value required to correct the positional deviation based on the distance Dx calculated by the positional deviation detection unit 46. This makes it possible to correct the positional deviation of the governor rope 36 so that it falls within the tolerance range by adjusting the attachment position of the connecting portion 26A based on the correction value. As a result, it becomes possible to correct the positional deviation by appropriately adjusting the attachment position of the connecting portion 26A.

[0040] According to the elevator 10 of this embodiment, it is possible to calculate (measure) the magnitude of the positional deviation of the governor rope 36 in the horizontal direction X and the horizontal direction Y caused by the rising and falling of the car 26 based on the position of the governor rope 36 measured via the range sensor 50 when the car 26 is stopped at different vertical positions.

[0041] Furthermore, in this embodiment, an example has been described in which misalignment of the governor rope 36 is corrected by adjusting the attachment position of the connecting portion 26A, but the present invention is not limited to this. For example, misalignment of the governor rope 36 may be corrected by adjusting the installation positions of the governor sheave 32 and the tension sheave 34. In this case as well, the same effects as those of the above embodiment can be obtained.

[0042] In the above embodiment, an example has been described in which the range sensor 50 calculates the distance Dx by detecting the car upper governor rope 36A, but the present invention is not limited to this. For example, the range sensor 50 may calculate the distance Dx by detecting the car lower governor rope 36B.

[0043] Incidentally, there may be cases where the building in which the elevator 10 is installed shakes due to an earthquake, strong wind, or the like, and the shaking resonates, causing horizontal vibration (hereinafter referred to as "lateral vibration") in the governor rope 36. However, if a large positional deviation exceeding the above-mentioned allowable value occurs in the governor rope 36, there is a problem in that it is not possible to accurately determine whether the horizontal displacement of the governor rope 36 measured via the range sensor 50 is due to lateral vibration or the above-mentioned positional deviation of the governor rope 36.

[0044] Therefore, as in this embodiment, by determining the positional deviation of the governor rope 36 in advance and reducing the magnitude of the positional deviation so that it is less than the allowable value, there is also the advantage that the lateral vibration of the governor rope 36 can be accurately determined.

[0045] The present invention can be implemented in various forms, including improvements, modifications, and variations based on the knowledge of those skilled in the art, without departing from the spirit of the invention. Furthermore, the invention can be implemented in a form in which any of the features of the invention are replaced with other technology, as long as the same action or effect is achieved. [Explanation of symbols]

[0046] 10 Elevator 12 Elevator shaft 16 Main Rope 24 Counterweight 26 Car 30 Speed ​​governor 32 Regulating sheave 34 Tension sheave 36 Speed-regulating rope 36A Upper car speed control rope 36B Undercarriage speed control rope 40 Control device 42 Storage section 44 Operation control unit 46 Position deviation detection unit 48 Correction value calculation unit 50 Range sensor (rope position detection unit) X,Y horizontal direction Z vertical direction

Claims

1. An elevator equipped with a speed governor that detects an overspeed of a car using a governor rope that is stretched between a governor sheave and a tension wheel and that is connected to a car that moves up and down in a hoistway via a connecting part, thereby moving up and down in conjunction with the car, a rope position detection unit that measures the position of the governor rope at a preset vertical position; a position deviation detection unit that calculates the magnitude of a position deviation of the governor rope based on the position of the governor rope detected via the rope position detection unit when the car is located at different vertical positions; An elevator equipped with:

2. The positional deviation detection unit determines an abnormality when the magnitude of the positional deviation of the governor rope is equal to or greater than a predetermined value.

2. The elevator of claim 1.

3. a correction value calculation unit that calculates a correction value required to correct the positional deviation based on the magnitude of the positional deviation of the governor rope calculated by the positional deviation detection unit, 2. The elevator of claim 1.

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