JP2013014406A - Device for detecting weight inside car of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the detection accuracy in a wider range of a rotation angle of a detection rotor, while using an acceleration sensor having a single-axis detection shaft.SOLUTION: The acceleration sensor 36 which is a type of the single-axis detection shaft is mounted on a detection pulley 34. A detection wire 30 is moved according to the weight inside a car, and the rotation angle of the detection pulley 34 is thereby varied. An outer peripheral shape of the detection pulley 34 is elliptical. As a result, in a region where the rotation angle is large, an angle variation in a drawn amount of the wire grows large, and a reduction is suppressed in a variation amount of a detection value by the acceleration sensor 36.

Description

  The present invention relates to an elevator car weight detection device that detects, with an acceleration sensor, an inclination angle of a detection rotating body that is rotated in accordance with a change in car weight.

  In the conventional elevator load detection device, the amount of movement of the shackle spring due to the change in the weight in the car is transmitted to the pulley through the wire and converted into the rotation of the pulley. The pulley is provided with an acceleration sensor, and the car weight is detected based on the output from the acceleration sensor. Then, the detected car weight is used for overriding detection and driving control.

  At this time, the acceleration sensor detects a gravitational acceleration component generated in the detection axis direction. That is, the detected tilt value by the acceleration sensor is expressed as g · sin θ (g: gravitational acceleration), where the tilt angle is θ.

  Further, the moving amount of the shackle spring, the pulling amount of the wire based thereon, and the rotation angle of the pulley are constant with respect to the weight in the car. However, the amount of change in the detected tilt value is not constant with respect to the wire pulling amount, and varies depending on the angle at that time.

  For example, when the angle changes from 10 ° to 20 °, the amount of change in the detected tilt value is g · sin 20 ° −g · sin 10 ° ≈0.168 g. However, when the angle changes from 60 ° to 70 °, the amount of change in the detected tilt value is g · sin 70 ° −g · sin 60 ° ≈0.074 g.

  That is, in this method, in a region where the rotation angle of the pulley is large (near 90 °), the fluctuation of the output value of the acceleration sensor with respect to the wire pulling amount becomes small, and the resolution decreases. For this reason, the rotation angle of the pulley used for detecting the weight in the car is limited to a range of, for example, ± 45 °.

  On the other hand, in another conventional load detection device, a biaxial acceleration sensor that detects gravity acceleration components in the radial direction and circumferential direction of the pulley is provided. A signal from the acceleration sensor is input to the load detection unit. In the load detection unit, a plurality of load calculation formulas for calculating a combined output of each detection value of the acceleration sensor are registered in association with a category of the effective detection range of the rotation angle (see, for example, Patent Document 1). ).

JP 2008-19071 A

  However, in the conventional load detection device as shown in Patent Document 1, a biaxial acceleration sensor is required to solve the problem of a decrease in detection accuracy near a pulley rotation angle of 90 ° in the uniaxial acceleration sensor. In addition, a complicated configuration for calculating a combined output of each detection value of the acceleration sensor is required.

  The present invention has been made to solve the above-described problems, and it is possible to improve the detection accuracy in a wider range of the rotation angle of the detection rotating body while using an acceleration sensor having a single detection axis. An object of the present invention is to obtain a weight detecting device for an elevator car.

  An elevator car weight detection apparatus according to the present invention includes a detection rotating body, a detection line wound around the detection rotating body, and moved according to the weight in the car to change the rotation angle of the detection rotating body, and the detection An acceleration sensor that is provided on the rotating body and that has a single detection axis and outputs a detection signal corresponding to the component of the gravitational acceleration in the direction of the detection axis is provided. At least a part has a shape in which the distance to the rotation center of the detection rotator gradually changes along the circumferential direction.

  In the elevator car weight detection apparatus according to the present invention, the distance to the rotation center of the detection rotator gradually changes along the circumferential direction in at least a part of the region where the detection lines on the outer periphery of the detection rotator are contacted and separated. Because of the shape, the angle variation of the detection rotator relative to the amount of movement of the detection line can be changed according to the rotation angle, thereby allowing a wider range of rotation angles of the detection rotator while using a single-axis acceleration sensor. Thus, the detection accuracy can be improved.

It is a block diagram which shows the elevator by Embodiment 1 of this invention. It is a front view which shows the weight detection apparatus in a car of FIG. It is a side view which shows the principal part of FIG. It is a front view which shows the detection pulley of FIG. It is a block diagram which shows a part of control system of the elevator of FIG. It is explanatory drawing which shows a motion when the detection pulley of FIG. 2 rotates from BL position to OL position in order of an angle. It is a front view which shows the detection pulley of the weight detection apparatus in a cage by Embodiment 2 of this invention. It is a block diagram which shows the elevator by Embodiment 3 of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a block diagram showing an elevator according to Embodiment 1 of the present invention. In this example, a machine room-less elevator is shown. In the figure, a support beam 2 is fixed to the top of the hoistway 1. A hoisting machine 3 is supported on the support beam 2. The hoisting machine 3 has a drive sheave 4 and a hoisting machine body 5. The hoisting machine body 5 includes a motor that rotates the drive sheave 4 and a brake that brakes the rotation of the drive sheave 4.

  A plurality of main ropes 6 are wound around the drive sheave 4 as suspension means. The car 7 and the counterweight 8 are suspended in the hoistway 1 by the main rope 6 and are raised and lowered by the hoisting machine 3. A pair of car suspension wheels 9 a and 9 b are provided at the lower part of the car 7. On the upper part of the counterweight 8, a counterweight suspension vehicle 10 is provided.

  The main rope 6 has a first end (cage side end) 6a and a second end (counterweight side end) 6b. The first end 6a is connected to the support beam 2 via a first rope stop (car side rope stop) 11a. The second end portion 6b is connected to the support beam 2 via a second rope stop portion (balanced weight side rope stop portion) 11b. In addition, an in-car weight detection device 12 is provided in the first rope stopper 11a.

  The main rope 6 is wound around the car suspension wheels 9a and 9b, the drive sheave 4 and the counterweight suspension wheel 10 in order from the first end portion 6a side, and reaches the second end portion 6b. That is, the car 7 and the counterweight 8 are suspended by the main rope 6 by a 2: 1 roping method.

  Next, FIG. 2 is a front view showing the car weight detecting device 12 of FIG. 1, and FIG. 3 is a side view showing the main part of FIG. Main ropes 6 are connected to the lower ends of the plurality of shackle rods 21 penetrating the support beam 2. A spring seat 22 is attached to the upper end portion of each shackle rod 21. A plurality of nuts 23 for restricting the upward movement of the spring seat 22 with respect to the shackle rod 21 are screwed to the upper end portion of each shackle rod 21.

  Between the support beam 2 and each spring seat 22, a shackle spring (coil spring) 24 that receives the load of the shackle rod 21 is disposed. Each shackle rod 21 passes through a shackle spring 24. When the weight in the car changes, the shackle rod 21 is displaced in the vertical direction and the shackle spring 24 is expanded and contracted.

  The first rope stopper 11 a includes a shackle rod 21, a spring seat 22, a nut 23, and a shackle spring 24.

  A pulley support member 25 that is displaced together with the shackle rod 21 is attached to the upper end portion of each shackle rod 21 by a plurality of nuts 26. Each pulley support member 25 is equipped with a rotatable rod-side pulley 27.

  A frame 28 is erected on the support beam 2. A plurality of rotatable frame side pulleys 29 are mounted on the frame 28. The frame side pulley 29 is disposed above the rod side pulley 27. Further, the rod-side pulley 27 and the frame-side pulley 29 are arranged so as to be alternately arranged as viewed from directly above.

  An intermediate portion of a detection wire 30 as a detection line is alternately wound around the rod side pulley 27 and the frame side pulley 29. That is, the detection wire 30 is arranged so as to meander between the pulleys 27 and 29. The detection wire 30 has a first end 30a and a second end.

  The first end 30 a of the detection wire 30 is fastened to the frame 28 via a fastener 31. The fastener 31 has a bar screw 31a and a plurality of nuts 31b.

  A detector 32 that detects the amount of displacement of the shackle rod 21 (the amount of expansion / contraction of the shackle spring 24) via the detection wire 30 is mounted on the frame 28. The detector 32 includes a support shaft 33, a detection pulley 34 as a detection rotating body, a torsion spring 35 as a tension applying means, and an acceleration sensor 36.

  The support shaft 33 is fixed horizontally to the frame 28. The detection pulley 34 can rotate around the support shaft 33. Moreover, the outer peripheral shape of the detection pulley 34 is an ellipse. The detection wire 30 is partially wound around the outer periphery of the detection pulley 34 and the second end of the detection wire 30 is fixed.

  The torsion spring 35 biases the detection pulley 34 in a direction in which the detection wire 30 is wound up (counterclockwise in FIG. 2), and applies tension to the detection wire 30. The spring force of the torsion spring 35 is sufficiently smaller than the spring force of the shackle spring 24.

  When the shackle rod 21 is displaced due to the change in the car weight, the pulley support member 25 and the rod-side pulley 27 are also displaced together, and the length from the first end 30a of the detection wire 30 to the portion that enters the detection pulley 34. Changes, and the rotation angle of the detection pulley 34 is changed. That is, when the detection wire 30 is moved according to the weight in the car, the rotation angle of the detection pulley 34 is also changed. At this time, the range in which the detection wire 30 on the outer periphery of the detection pulley 34 is in contact changes.

  The acceleration sensor 36 has a sensor substrate mounted on the detection pulley 34 and a sensor main body mounted on the sensor substrate. As the sensor body, a capacitance type (semiconductor type) sensor having a single detection axis is used. A pair of guide pulleys 37 for guiding the detection wire 30 are provided between the frame-side pulley 29 and the detection pulley 34 that are closest to the detection pulley 34.

  FIG. 4 is a front view showing the detection pulley 34 of FIG. The detection pulley 34 rotates in the clockwise direction in the figure when the weight in the car increases, and rotates in the counterclockwise direction in the figure when the weight in the car decreases.

  Due to the rotation of the detection pulley 34, the acceleration sensor 36 is displaced on the circumference around the rotation center of the detection pulley 34 while changing the tilt angle. In the first embodiment, when the load on the car 7 side and the load on the counterweight 8 are equal (balance load), the acceleration sensor 36 is set to be positioned at the uppermost position on the circumference (BL position). : Reference position).

  The detection pulley 34 is arranged so that the short axis is horizontal and the long axis is vertical when the acceleration sensor 36 is located at the BL position. The acceleration sensor 36 is disposed on the long axis of the detection pulley 34. The detection axis direction of the acceleration sensor 36 is set to be horizontal when the acceleration sensor 36 is located at the BL position.

  The acceleration sensor 36 is displaced to the OL (overload) position when the car weight becomes maximum, and is displaced to the NL (no load) position when the car weight becomes minimum. In the first embodiment, the OL position is set to + 90 ° and the NL position is set to −90 ° with respect to the BL position. Further, the acceleration sensor 36 outputs a detection signal of g · sin θ, which is a component in the detection axis direction of the gravitational acceleration g, as an inclination detection value corresponding to the inclination angle. Further, the acceleration sensor 36 outputs signals having different polarities depending on whether the acceleration sensor 36 is inclined from the NL position toward the OL position or the NL position.

  FIG. 5 is a block diagram showing a part of the control system of the elevator shown in FIG. A detection signal from the acceleration sensor 36 is input to the weight detection unit 38. The weight detection unit 38 is constituted by a microcomputer, for example, and calculates the weight in the car based on the detection signal from the acceleration sensor 36.

  The car weight information calculated by the weight detector 38 is sent to an elevator controller 39 that controls the operation of the car 7. The elevator control device 39 performs overriding detection and operation control based on the detected car weight. For example, the elevator control device 39 changes the maximum speed and acceleration of the car 7 according to the weight in the car.

  FIG. 6 is an explanatory view showing the movement of the detection pulley 34 of FIG. 2 in the order of angles when the detection pulley 34 is rotated from the BL position to the OL position. As an example, considering the case where the major axis of the detection pulley 34 is 100 mm, the minor axis is 50 mm, and the horizontal distance from the rotation center of the detection pulley 34 to the guide pulley 37 is 75 mm, the rotation angle of the detection pulley 34 is 10 ° to 20 °. The amount of wire drawing required to vary the angle is about 11 mm.

  On the other hand, the wire pulling amount required to change from 60 ° to 70 ° is about 7 mm, and the wire pulling amount required to change from 70 ° to 80 ° is about 5 mm. In other words, the detection pulley 34 can be rotated by about 20 ° with the same wire pulling amount.

  When the rotation angle of the detection pulley 34 changes from 10 ° to 20 °, the amount of change in the inclination detection value by the acceleration sensor 36 is g · sin 20 ° −g · sin 10 ° ≈0.168 g as described above.

  In the car weight detecting apparatus 12 according to the first embodiment, it can be rotated from 60 ° to 80 ° with substantially the same pulling amount in the vicinity of 10 °, and the fluctuation amount of the inclination detection value at this time is g · sin80. ° -g · sin60 ° ≈0.118 g.

  As described above, since the outer periphery of the detection pulley 34 is elliptical, the rotation angle of the detection pulley 34 from the reference position becomes large (in 90 °) in the region where the detection wire 30 on the outer periphery of the detection pulley 34 is contacted and separated. As the distance approaches, the distance to the rotation center of the detection pulley 34 gradually decreases. That is, when the inclination angle of the acceleration sensor 36 increases, the distance (the apparent diameter of the detection pulley 34) between the entry portion (contact start point) of the detection wire 30 to the detection pulley 34 and the rotation center of the detection pulley 34. Becomes smaller.

  For this reason, in the region where the rotation angle is large, the angle variation with respect to the wire pulling amount becomes large, and the decrease in the variation amount of the detection value by the acceleration sensor 36 is suppressed. Accordingly, a decrease in resolution is also suppressed, it is possible to effectively use up to a region with a large inclination angle, and the weight in the car can be detected with higher accuracy. Further, by controlling the operation of the car 7 based on such a highly accurate detected value of the weight in the car, for example, it is possible to further improve riding comfort. Further, since the acceleration sensor 36 having a single detection axis is used, the calculation process of the weight in the car is simple, so that the configuration is not complicated and the cost can be reduced.

  Further, since the guide pulley 37 is provided between the frame-side pulley 29 and the detection pulley 34, the detection wire 30 can be smoothly put in and out of the detection pulley 34.

Embodiment 2. FIG.
Next, FIG. 7 is a front view showing a detection pulley 34 of the car weight detecting apparatus according to the second embodiment of the present invention. In the second embodiment, the detection axis direction of the acceleration sensor 36 is set to be vertical when the acceleration sensor 36 is located at the BL position. Further, the acceleration sensor 36 outputs a detection signal of g · cos θ, which is a detection axis direction component of the gravitational acceleration g, as an inclination detection value corresponding to the inclination angle.

  The outer peripheral shape of the detection pulley 34 is elliptical as in the first embodiment. However, the detection pulley 34 is arranged such that the long axis is horizontal and the short axis is vertical when the acceleration sensor 36 is located at the BL position. The acceleration sensor 36 is disposed on the short axis of the detection pulley 34. Other configurations are the same as those in the first embodiment.

  In such an in-car weight detection device, in the region where the detection wire 30 on the outer periphery of the detection pulley 34 is contacted and separated, the detection pulley 34 increases as the rotation angle of the detection pulley 34 from the reference position increases (approaches 90 °). The distance to the center of rotation gradually increases. That is, when the inclination angle of the acceleration sensor 36 increases, the distance (the apparent diameter of the detection pulley 34) between the entry portion (contact start point) of the detection wire 30 to the detection pulley 34 and the rotation center of the detection pulley 34. Becomes larger.

  For this reason, in the region where the rotation angle of the detection pulley 34 is small (close to the BL position), the angle fluctuation with respect to the wire pulling amount becomes large, and the decrease in the fluctuation amount of the detection value by the acceleration sensor 36 is suppressed. Accordingly, a decrease in resolution is also suppressed, it is possible to effectively use up to a region with a large inclination angle, and the weight in the car can be detected with higher accuracy. In addition, since the acceleration sensor 36 having a single detection axis is used, the calculation process of the weight in the car is simple, the complexity of the configuration can be suppressed, and the cost can be reduced.

Thus, even when the detection sensor direction of the acceleration sensor 36 is different, the present invention can be applied and the same effect can be obtained.
In the second embodiment, when the OL position is set to + 90 ° and the NL position is set to −90 °, both g · cos θ are 0. Therefore, the effective detection range is set slightly narrower, or + 90 ° and −90. It is preferable to detect the difference from ° by other means.

Embodiment 3 FIG.
Next, FIG. 8 is a block diagram showing an elevator according to Embodiment 3 of the present invention. In the figure, a machine room 42 is provided above the hoistway 41. In the machine room 42, a hoisting machine 43 is installed. The hoisting machine 43 has a drive sheave 44 and a hoisting machine main body 45. The hoisting machine main body 45 includes a motor that rotates the drive sheave 44 and a brake that brakes the rotation of the drive sheave 44.

  A plurality of main ropes 46 as suspension means are wound around the drive sheave 44. The main rope 46 has a first end (a car side end) 46a and a second end (a counterweight side end) 46b.

  A car 47 is connected to the first end 46a. A counterweight 48 is connected to the second end 46b. The car 47 and the counterweight 48 are suspended in the hoistway 1 by the main rope 6 by a 1: 1 roping method, and are lifted and lowered by the hoisting machine 43.

  The first end portion 46a is connected to the upper beam of the car 47 through the first main rope connection device 49a. The second end portion 46b is connected to the upper portion of the counterweight 48 through the second main rope connection device 49b. The first main rope connection device 49a is provided with a car weight detection device 12. The configurations of the first main rope connection device 49a and the car weight detection device 12 are the same as those in FIG.

  The same in-car weight detection device 12 as in the first embodiment (or the second embodiment) can be applied to such a 1: 1 roping elevator, and the same effect can be obtained.

In the above example, the outer peripheral shape of the detection pulley 34 is an ellipse, but it may not be an exact ellipse.
Further, the entire shape of the detection pulley 34 does not need to be an ellipse, and an area where the detection wire 30 on the outer periphery of the detection pulley 34 is contacted / separated (an area where the detection wire 30 is wound or separated depending on the rotation angle of the detection pulley 34) ), That is, only the region corresponding to the effective detection range may be an elliptical outer peripheral shape or a similar shape thereto. For example, the lower half of the detection pulley 34 in FIG. 2 may be cut into a semi-elliptical shape.
Furthermore, only a part of the region where the detection wire 30 on the outer periphery of the detection pulley 34 is in contact with or separated from the detection pulley 34 may have an elliptical outer peripheral shape or a similar shape thereto.

Furthermore, the detection axis direction of the acceleration sensor 36 is not limited to the first and second embodiments, and can be arbitrarily set.
In the first and second embodiments, the effective detection range of the rotation angle of the detection pulley 34 is ± 90 ° with respect to the BL position. However, the present invention is not limited to this. For example, the range is reduced to ± 80 °. It may be °.
Furthermore, the means for applying tension to the detection wire 30 is not limited to the torsion spring 35. For example, a tension spring may be connected to the second end of the detection wire 30 or a weight may be suspended. Good.
Furthermore, the detection line is not limited to the detection wire 30 and may be, for example, a string, a belt, or a single line made of metal or resin.

Further, the mechanism for moving the detection wire 30 according to the weight in the car is not limited to the above example.
Furthermore, in the above example, the distance to the rotation center is changed in the entire region where the detection wire 30 on the outer periphery of the detection pulley 34 is contacted and separated, but it may be changed only in a part of the region.

In the above example, the main ropes 6 and 46 are shown as the suspension means. However, a plurality of belts may be used as the suspension means.
Further, the layout of the elevator equipment is not limited to FIG. 1 or FIG. For example, the hoisting machine 3 of FIG. 1 is installed in the lower part of the hoistway 1, the hoisting machine 3 is arranged so that the rotational axis of the drive sheave 4 is substantially vertical, or a plurality of counterweights 8 are provided. It may be divided.
Furthermore, the present invention can be applied to all types of elevators such as a double deck elevator and a multi-car elevator provided with a plurality of cars in a common hoistway.

  30 detection wires (detection lines), 34 detection pulleys (detection rotating bodies), 36 acceleration sensors.

Claims (3)

Detection rotor,
A detection line that is wound around the detection rotating body and moves according to the weight in the car to change the rotation angle of the detection rotating body, and provided on the detection rotating body, and has one detection axis. An acceleration sensor that outputs a detection signal corresponding to a component of gravity acceleration in the detection axis direction,
At least a part of a region where the detection line on the outer periphery of the detection rotator is in contact with or separated from the detection rotator has a shape in which the distance to the rotation center of the detection rotator gradually changes along the circumferential direction. Elevator car weight detection device.   2. The elevator car weight detection device according to claim 1, wherein at least a part of a region where the detection line on the outer periphery of the detection rotating body is in contact with or separated from each other has an elliptical outer peripheral shape. The acceleration sensor outputs a detection signal of g · sin θ, where g is a gravitational acceleration and θ is a rotation angle of the detection rotating body from a reference position,
At least a part of a region where the detection line on the outer periphery of the detection rotating body is in contact with or separated from has a shape in which the distance to the rotation center of the detection rotating body gradually decreases as the rotation angle θ increases. The elevator car weight detecting device according to claim 1 or 2, wherein the elevator car weight detecting device is provided.

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