WO2003053836A1

WO2003053836A1 - Load detection device and control method therefor, and elevator device

Info

Publication number: WO2003053836A1
Application number: PCT/JP2001/011183
Authority: WO
Inventors: Shigenobu Kawakami; Yukihiro Takigawa
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2001-12-20
Filing date: 2001-12-20
Publication date: 2003-07-03
Also published as: KR20030079996A; EP1464607B1; JP4137795B2; CN1492833A; EP1464607A1; DE60141306D1; KR100574434B1; EP1464607A4; CN1297464C; JPWO2003053836A1

Abstract

A load detection device equipped with a sensor (32) for detecting the angle of rotation of a rotary body (35) that rotates in response to changes in load, wherein the state of wires (18, 40) is decided on the basis of detected values from the sensor (32). This makes it possible to reliably recognize breakage of the wires (18, 40), thereby avoiding a burden on the elevator device due to lifting/lowering with the car full of load.

Description

Description Load detecting device and control method thereof, elevator device

The present invention relates to a load detection device for detecting a load applied to a car of an elevator device, a control method thereof, and an elevator device. Background art

8 and 9, a description will be given of a conventional load detecting device of the elevator device. FIG. 8 is a schematic diagram showing a conventional load detecting device. In FIG. 8, 1 is a base installed in a hoistway or a machine room, 3 is a plurality of shirt loop rods that penetrate the base 1 and support one end of a tow rope that suspends a car, etc., and 5 is a shirt loop opening. 7 is a nut for determining the use length of the shackle spring, 8 is a nut for fixing the pulley base, and 10 is the variation in the load applied to multiple shirt rods 3. , A plurality of pulley stands supported by a shirt pull rod 3 and supporting a moving pulley, 1 3 are a plurality of moving pulleys interlocked with the vertical displacement of the shackle rod 3, and 1 5 are loads A frame supporting the detection device, 16 is a plurality of fixed pulleys supported by the frame 15 and the working side wire is wound, and 18 is one end supported by the detection pulley and the other end is slidingly moved. And the operating wire supported by the fixing member via the fixing slide, 20 is a bar screw as a fixing member, 22 is a nut for positioning the bar screw 20, and 30 is a frame 15. A fixed support shaft, 32 is installed on the detection pulley and a sensor that detects the rotation angle of the detection bouley, and 35 is rotated in conjunction with the movement of the working wire 18 and the tension side wire. The detection pulley 35a is a notch provided in the detection pulley 35, 37 is a fixing fitting that fits into the notch 35a and supports the operation side wire 18 and the tension side wire. Reference numeral 40 denotes a tension-side wire having one end supported by a fixing bracket 37 and the other end supported by a tension spring. Reference numeral 42 denotes a rotating force for applying a rotating force to the detection pulley 35 in a no-load direction. Tension as supply unit Shows a spring.

Here, the shirt loop rod 3, the shirt loop spring 10, the spring seat 5, the nut 7, the base 1, and the like constitute a tie-down portion of the elevator apparatus. Note that the cleats are installed in the hoistway or in the machine room. A tow rope (not shown) supported at the lower end of the shirt loop rod 3 suspends a not-shown riding car and a power weight in the hoistway, and is driven by a hoist to drive the riding car and the counter. Raise and lower the weight in the opposite direction.

On the other hand, a load detection device is composed of moving pulleys 13, pulley stands 12, fixed pulleys 16, detection pulleys 35, sensors 32, working wires 18, tension wires 40, and tension springs 42. are doing.

The load detecting device operates as follows.

First, the operation side wire 18 is wound around a plurality of moving pulleys 13 and a plurality of fixed pulleys 16 alternately. Then, the operation wire 18 gives the detecting pulley 35 a rotating force for rotating the detecting pulley 35 clockwise in the figure. On the other hand, the tension-side wire 40 and the tension spring 42 apply a rotating force to rotate the detection pulley 35 counterclockwise (no load direction). As a result, a predetermined tension is applied to the working wire 18. The position of the sensor 32 shown in FIG. 8 indicates a case where the load in the car is in the reference state.

When the load in the car is heavier than the reference state, the shirt loop rod 3 pushes down the shackle spring 10 and moves below the position shown in FIG. With the movement of the shirt loop rod 3, the positions of the moving pulley 13 and the pulley stand 12 also move downward. Thereby, the operation side wire 18 rotates the detection pulley 35 clockwise in the drawing. At this time, the moving amount of the working side wire 18 corresponds to twice the moving amount of the shirt loop rod 3, and the rotation angle of the detection pulley 35 corresponds to the moving amount of the working side wire 18.

At this time, the detection pulley 35 and the sensor 32 fixed to the detection pulley 35 rotate clockwise about the support shaft 30. Then, the rotation angle of the detection pulley 35 is detected by the sensor 32, and the load in the car is detected from the detected value. Here, the sensor 32 is, for example, an inclination sensor (acceleration sensor), It detects the component force of the acceleration and obtains the rotation angle of the detection pulley 35 from the value.

On the other hand, when the load in the car is lighter than the reference state, the shirt loop rod 3 is pushed up by the spring force of the shackle spring 10 and moves upward from the position in FIG. With the movement of the shirt loop rod 3, the positions of the moving pulley 13 and the pulley stand 12 also move upward. At this time, the tension is applied to the operation side wire 18 by the tension side wire 40 and the tension spring 42, and the detection pulley 35 rotates counterclockwise in the drawing. Then, the rotation angle of the detection pulley 35 is detected by the sensor 32, and the load in the car is detected from the detected value.

The detected value of the load of the car detected as described above is transferred to the control unit that controls the inverter in the drive power supply of the hoist. Then, according to the detected value, the rotation speed of the hoist around which the tow rope is wound is finely adjusted. On the other hand, if the detected value of the load on the car exceeds a predetermined value, control is performed so that a warning sound indicating that the car is overloaded is issued to the car.

FIG. 9 is a schematic view showing another conventional load detecting device. The load detector of FIG. 9 differs from the load detector of FIG. 8 in that a weight 45 is used instead of the tension spring 42 for applying tension to the working wire 18. I do. Specifically, one end of the tension side wire 40 is connected to the fixing bracket 37 of the detection pulley 35, and the other end is connected to the weight 45. The configuration of each of the other members and the operation of the load detection device are the same as those of the above-described load detection device in FIG. However, in the load detection device described above, when the operation side wire 18 or the tension side wire 40 is broken, a load exceeding the allowable load is loaded on the car, or the detection pulley 35 rotates. There is a problem that the detection pulley 35 runs idle without being able to control the speed.

For details, if the tension side wire 40 or the operation side wire 18 is broken, the tension is not applied to the operation side wire 18 and the detection pulley 35 Will not rotate. For this reason, the load of the car cannot be detected properly.For example, even if the load of the car is overloaded, it cannot be detected, and the car is overloaded. Up and down in the state of There was a possibility that the tow rope and the like might be damaged.

When the working wire 18 is broken, only the counterclockwise turning force by the tension spring 42 or the weight 45 and the tension wire 40 is applied to the detection pulley 35. For this reason, the detection pulley 35 may be excessively rotated in the counterclockwise direction, and the electric wiring (harness) of the sensor 32 or the like may be wound around the support shaft and cut.

The present invention has been made in order to solve the above-mentioned problem, and even if a wire wound around a detection pulley as a rotating body is broken, the car is not raised and lowered in an overloaded state. It is still another object of the present invention to provide a highly reliable load detection device, a control method thereof, and an elevator device, in which parts such as sensors are not damaged. Disclosure of the invention

The present invention relates to a load detecting device provided with a sensor for detecting a rotation angle of a rotating body that rotates in response to a load change, and determines a state of a wire based on a detection value of the sensor. . This makes it possible to reliably recognize the breakage of the wire, thereby avoiding the burden on the elevator apparatus caused by raising and lowering the car in an overloaded state. Further, the present invention, in the above-described improved load detecting device, identifies whether or not the wire is in a normal state based on whether or not the detected value of the sensor is within a predetermined range. This makes it possible to reliably recognize the breakage of the wire, thereby avoiding the burden on the elevator apparatus caused by raising and lowering the car in an overloaded state.

Further, the present invention provides the above-described improved load detecting device, wherein a normal range of the wire state is determined by adding or subtracting a margin from a value detected by the sensor under an allowable load or under no load. . This makes it possible to reliably recognize the breakage of the wire, thereby avoiding the burden on the elevator system caused by raising and lowering the car in an overloaded state.

Further, the present invention is a load detecting device including a rotating body that rotates in response to a load change, and includes a rotation restricting member that restricts a rotating range of the rotating body. Thus, even if the wire wound around the rotating body is broken, the rotation of the rotating body can be stopped at a predetermined rotation angle, thereby reducing damage to components such as sensors in the device. Further, the present invention, in the above-described improved load detection device, determines the state of the wire based on a detection value of a sensor that detects a rotation angle of the rotating body. As a result, since the rotation of the rotating body can be stopped at a predetermined rotation angle, damage to components such as sensors in the apparatus is reduced. Furthermore, since the breakage of the wire can be reliably recognized, the burden on the elevator system due to raising and lowering the car in an overloaded state can be avoided.

Further, the present invention, in the above-described improved load detection device, identifies whether or not the wire is in a normal state based on whether or not the detection value of the sensor is within a predetermined range. Thus, since the rotation of the rotating body can be stopped at a predetermined rotation angle, damage to components such as a sensor in the device is reduced. Furthermore, since the breakage of the wire can be reliably recognized, it is possible to avoid a burden on the elevator system due to raising and lowering the car in an overloaded state.

Further, the present invention provides the above-described improved load detecting device, wherein a normal range of the wire state is determined by adding or subtracting a margin from a value detected by the sensor under an allowable load or under no load. . Thus, since the rotation of the rotating body can be stopped at a predetermined rotation angle, damage to components such as a sensor in the apparatus is reduced. Furthermore, since it is possible to reliably recognize the wire breakage, it is possible to avoid the burden on the elevator system caused by raising and lowering the car in an overloaded state.

Further, according to the present invention, in the above-described improved load detection device, the rotation restricting member restricts the supply of rotational power to the rotating body by the rotational power supply unit connected to the tension side wire. Thus, since the rotation of the rotating body can be stopped at a predetermined rotation angle, damage to components such as sensors in the device is reduced.

Further, the present invention, in the above-described improved load detection device, restricts the movable range of the tension spring as a turning power supply unit with a regulating wire as a rotation regulating member. Thus, since the rotation of the rotating body can be stopped at a predetermined rotation angle, damage to components such as a sensor in the device is reduced.

According to the present invention, in the improved load detecting device described above, the rotation restricting member restricts the amount of movement of the moving pulley to restrict the supply of rotational power to the rotating body. As a result, since the rotation of the rotating body can be stopped at a predetermined rotation angle, The damage of components such as the sensor can be reduced.

Further, according to the present invention, in the above-described improved load detection device, the rotation restricting member is constituted by a first pulley base and a second pulley base having a slide mechanism. As a result, since the rotation of the rotating body can be stopped at a predetermined rotation angle, damage to components such as sensors in the apparatus is reduced.

Further, the present invention is an elevator apparatus including the improved load detecting device described above. This makes it possible to reliably recognize the breakage of the wire, thereby avoiding the burden on the elevator system due to raising and lowering the car in an overloaded state. Further, since the rotation of the rotating body can be stopped at a predetermined rotation angle, damage to components such as a sensor in the load detection device is reduced.

Further, the present invention relates to the improved elevator apparatus described above, wherein the control unit identifies the wire state based on the detection value of the sensor, and controls the elevation of the car based on the identification result. Things. This makes it possible to reliably recognize the breakage of the wire, thereby avoiding the burden on the elevator system caused by raising and lowering the car in an overloaded state.

Further, the present invention is a control method of a load detecting device provided with a sensor for detecting a rotation angle of a rotating body which rotates in response to a load change, wherein the state of the wire is determined based on a detection value of the sensor. Is to judge. This makes it possible to reliably recognize the breakage of the wire, thereby avoiding the burden on the elevator system due to raising and lowering the car in an overloaded state.

Further, the present invention, in the above-mentioned improved method of controlling a load detecting device, identifies whether or not a wire is in a normal state based on whether or not a detected value of a sensor is within a predetermined range. This makes it possible to reliably recognize the breakage of the wire, thereby avoiding the burden on the elevator apparatus caused by raising and lowering the car in an overloaded state.

Further, according to the present invention, in the control method of the improved load detection device described above, the normal range of the wire state is determined by adding or subtracting a margin from a value detected by the sensor under an allowable load or no load. It is a thing. As a result, wire breaks can be recognized with certainty, and the elevator system can be installed by raising and lowering the car in an overloaded state. The burden can be avoided. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a schematic diagram showing a load detection device according to Embodiment 1 of the present invention. FIG. 2 is a graph showing a relationship between an output value of a sensor and a rotation angle of a rotating body in the load detection device of FIG.

FIG. 3 is a schematic diagram showing a state in which the working-side wire is broken in the load detection device of FIG.

FIG. 4 is a schematic diagram showing a load detection device according to Embodiment 2 of the present invention. FIG. 5 is a schematic diagram showing a state in which the tension side wire is broken in the load detection device of FIG.

FIG. 6 is an enlarged view showing a moving pulley and a pulley stand in the load detection device of FIG. FIG. 7 is a sectional view showing a section taken along line X_X of the moving pulley and the pulley stand of FIG. 6. FIG. 8 is a schematic view showing a conventional load detecting device.

FIG. 9 is a schematic view showing another conventional load detecting device. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be described in more detail with reference to the accompanying drawings. In each of the drawings, the same or corresponding portions are denoted by the same reference characters, and description thereof will be appropriately simplified or omitted.

The load detecting device according to the first embodiment of the present invention will be described with reference to FIGS. Figure

FIG. 1 is a schematic diagram showing a load detection device according to Embodiment 1 of the present invention. Figure 2

2 is a graph showing a relationship between an output value of a sensor and a rotation angle of a rotating body in the load detection device of FIG. FIG. 3 is a schematic diagram showing a state in which the working-side wire is broken in the load detection device of FIG.

1 to 3, 1 is a base, 3 is a plurality of shirt loop rods, and 5 is a spring seat.

, 7 and 8 are nuts, 10 is a plurality of shirt loop springs, 1 2 is a plurality of pulley stands supported by the shirt pull rod 3 and supports a moving pulley, 1 3 is a shirt loop rod 3 A plurality of moving pulleys linked to the vertical displacement of the vehicle, 15 is a frame supporting the load detecting device, 16 is a fixed pulley supported on the frame 15, 18 is one end supported by the detecting pulley and other Working-side wire whose end is supported by a fixed member via a moving pulley and a fixed pulley, 20 is a rod screw as a fixing member, 22 is a nut for positioning the rod screw 20, and 30 is a frame 15 is a support shaft fixed to 5, 3 is a sensor such as an inclination sensor that is installed on the detection pulley and detects the rotation angle of the detection pulley. 3 3 is a wire 18 based on the detection value of the sensor 32. , 40 is a control unit for judging the state, 35 is a detection pulley as a rotating body that rotates in conjunction with the movement of the operation side wire 18 and the tension side wire, and 35 a is provided on the detection pulley 35. Notch 3 7 fits into the notch 3 5 a and the working side wire 18 and 40 is a tension side wire whose one end is supported by the fixing bracket 37 and the other end is supported by a tension spring. 42 is a direction in which no load is applied to the detection pulley 35. A tension spring as a rotating power supply unit for applying a rotating power of 50, 50 is a fixing screw fixed to the frame 15, 52 is one end supported by the fixing screw 50 and the other end is a tension spring 4 2 The control wire supported by is shown.

Here, the shirt clasp 3, the shirt clump spring 10, the spring seat 5, the nut 7, the base 1, and the like constitute a gland portion. The girder is installed in the hoistway or in the machine room. Then, a tow rope (not shown) supported at the lower end of the shirt loop rod 3 suspends a not-shown car and a counter weight in the hoistway, and is driven by the hoist to drive the car and the counter weight. Are raised and lowered in opposite directions.

On the other hand, moving pulley 13, pulley stand 12, fixed pulley 16, detection pulley 35, sensor 32, working wire 18, tension wire 40, tension spring 42, regulating wire 52, fixing screw 50 etc. constitute the load detection device.

The normal operation of the load detecting device configured as described above will be described.

First, the working side wire 18 is wound around the moving pulley 13 and the fixed pulley 16 alternately. Then, the operation wire 18 gives the detecting pulley 35 a rotating force for rotating the detecting pulley 35 clockwise in the drawing. On the other hand, tension side wire 4 0 and the tension spring 42 apply a rotating force to rotate the detection pulley 35 counterclockwise. As a result, a predetermined tension is applied to the operation side wire 18.

If the load in the car is heavier than the reference state, the shirt loop rod 3 pushes down the shackle spring 10 and moves below the position shown in FIG. With the movement of the shirt loop rod 3, the positions of the moving pulley 13 and the pulley stand 12 also move downward. Thereby, the operation side wire 18 rotates the detection pulley 35 clockwise in the drawing. Then, the rotation angle of the detection pulley 35 is detected by the sensor 32, and the load in the car is detected from the detected value.

On the other hand, when the load in the car is lighter than the reference state, the shirt loop rod 3 is pushed up by the spring force of the shirt loop spring 10 and moves upward from the position in FIG. With the movement of the shirt loop rod 3, the positions of the moving pulley 13 and the pulley stand 12 also move upward. As a result, the actuating wire 18 also moves, and the detection bulge 35 rotates counterclockwise in the figure. Then, the rotation angle of the detection pulley 35 is detected by the sensor 32, and the load in the car is detected from the detected value.

The detected value of the load of the car detected as described above is transferred to the control unit 33, and thereafter, the information is transferred to the drive unit of the hoist, the operation unit of the car, and the like. become.

Next, the operation of the load detecting device according to the first embodiment when an abnormality occurs will be described with reference to FIGS. FIG. 2 is a graph showing a relationship between an output value of a sensor and a rotation angle of a rotating body in the load detection device of FIG.

2, the horizontal axis represents the rotation angle of the detection pulley 35 in FIG. 1, and the vertical axis represents the detection value (output value) of the sensor 32 in FIG.

Then, when the load of the car of the elevator device is in the reference state (the state in FIG. 1), the rotation angle of the detection pulley becomes 0 ° (BL in the figure), and FIG. As shown in the figure, the detection value of the sensor is 0. On the other hand, when the load of the car is unloaded, the detection pulley rotates counterclockwise in FIG. 1, and the sensor has a detection value corresponding to NL in FIG. Furthermore, when the load of the car is in the allowable load state, the detection pulley rotates clockwise in Fig. 1, and the sensor corresponds to FL in Fig. 2. Detected value. Here, the permissible load is the upper limit of the load capacity of the car, which is determined in advance from the viewpoint of the structure of the elevator device and the regulations.

The load detecting device according to the first embodiment determines the state of the working-side wire and the tension-side wire based on the detection value of the sensor. Specifically, the rotation angle L2 obtained by subtracting the margin M2 from the rotation angle NL at no load and the margin M1 to the rotation angle FL under the allowable load The range of 1 is defined as a normal detection range S in which the detection pulley operates normally without any abnormality such as breakage in the operation side wire and the tension side wire. On the other hand, the rotation angle L2 obtained by subtracting the allowance M2 from the rotation angle NL when no load is applied and the rotation angle L1 obtained by adding the allowance Ml to the rotation angle FL when the allowable load is applied. The range outside of the range is defined as the abnormal detection range AS where the detection pulley does not operate normally due to the occurrence of an abnormality in the operation side wire or the tension side wire. Such a distinction between the normal detection range S and the abnormality detection range AS is based on the fact that the detection value of the sensor is a minimum value corresponding to the rotation angle L2 and a maximum value corresponding to the rotation angle L1. The determination is made by the control unit 33 in FIG. 1 as to whether or not to enter the range.

Then, when the detection value of the sensor becomes larger than the maximum value or smaller than the minimum value, the information is transmitted from the control unit to the car, the hoist, etc., and a measure for preventing overloading the car is taken. Be taken. Specifically, for example, a hoist is controlled to suspend the elevation of the car, or an operation panel in the car is controlled to emit a warning sound. Thus, it is possible to prevent the operation of the elevator device when the load detection device has failed.

In addition, regarding the rotation angle of the detection pulley, the allowance M2 on the no-load side is, for example, a value of 10 to 15% with respect to the weight when the car is empty. The allowance Ml on the allowable load side is, for example, a value of 10 to 15% of the weight when the car is full. Then, for example, when the detection value of the sensor falls within the abnormality detection range AS continuously for a predetermined time, the control unit can recognize the breakage of the operation side wire and the tension side wire.

Next, a rotation restricting member that restricts the rotation of the detection pulley in the counterclockwise direction in the load detection device according to the first embodiment will be described with reference to FIG. FIG. 3 is a schematic diagram showing a state in which the working-side wire is broken in the load detection device of FIG. In FIG. 3, the working-side wire 18 is broken at the break P1. At this time, the operating wire loses the tension of rotating the detection pulley 35 clockwise, and the detection pulley 35 is moved counterclockwise by the tension spring 42 and the tension wire 40 (arrow in FIG. 3). Direction). Then, when the rotation of the detection bouley 35 exceeds the normal detection range S, the control unit 33 recognizes the breakage of the operation side wire 18 as described above.

Further, when the detection pulley 35 rotates beyond the normal detection range S, the turning power by the tension spring 42 is regulated according to the length of the regulation wire 52. As a result, the rotation of the detection pulley 35 stops. That is, when the detection pulley 35 is rotating normally, as shown in FIG. 1, the regulating wire 52 is in a slack state. On the other hand, when the detection pulley 35 rotates counterclockwise beyond the normal range, as shown in FIG. 3, the regulating wire 52 is in a stretched state. At this time, the tension spring 42, one end of which is supported by the regulating wire 52, is maintained at a predetermined spring length without contracting to a free length. Then, at that position, the rotation of the detection pulley 35 stops.

In this way, it is possible to reliably prevent a problem such as a disconnection of the harness in the sensor 32 due to the excessive rotation of the detection pulley 35 due to the cutting of the operation side wire 18.

As described above, according to the load detection device according to the first embodiment, even if the wire wound around the detection pulley serving as the rotating body is broken, the car can be moved up and down in an overloaded state. There is no damage to components such as sensors, and high reliability can be obtained.

In the first embodiment, the tension spring 42 is used as the turning power supply unit. However, the turning power supply unit according to the present invention is not limited to this. For example, as shown in FIG. A weight 45 can be used, or a torsion coil spring can be provided on the support shaft 30 of the detection pulley 35 and used as a rotating power supply member. Also, in this case, the same effect as in the second embodiment can be obtained. A load detection device according to a second embodiment of the present invention will be described with reference to FIGS. Figure FIG. 4 is a schematic diagram showing a load detection device according to Embodiment 2 of the present invention. FIG. 5 is a schematic diagram showing a state in which the tension side wire is broken in the load detection device of FIG. FIG. 6 is an enlarged view showing a moving pulley and a pulley stand in the load detection device of FIG. FIG. 7 is a sectional view showing a section taken along line X-X of the moving pulley and the pulley stand of FIG.

The load detecting device of the second embodiment is characterized in that the tension spring 42 has no regulating wire and that the pulley base relating to one of the moving pulleys is of a sliding type. It is different from form 1.

In FIGS. 4 to 7, 1 is a base, 3 is a plurality of shirt loop rods, 5 is a spring seat, 7, 8, 22 is a nut, 10 is a plurality of shirt loop springs, 1 is a pulley stand, and 1 is a pulley stand. A plurality of movable pulleys, 14 is fixed to the first pulley base and a support shaft serving as the center of rotation of the movable pulley, 15 is a frame, 16 is a fixed pulley, 18 is a working side wire, 2 0 is a bar screw, 30 is a spindle, 3 2 is a sensor, 3 3 is a control unit, 3 5 is a detection burry, 3 5 a is a cutout, 3 7 is a fixing bracket, 40 is a tension side wire, 4 2 Is a tension spring, 62 is the first pulley table supporting the moving pulley 13, 62 a is a plurality of long holes as through holes provided in the first pulley table 62, and 63 is for screw penetration The second pulley base that has a hole and allows the slide movement of the first pulley base 62, 65 is a screw that passes through the long hole 62a and the hole of the second pulley base 63, and 67 is Flat seat installed on the screw head side of screw 6 5, 6 8 Is a collar installed on the male thread of the screw 65, 70 is a nut to be screwed to the screw 65, 72 is a flat seat installed on the nut 70 side, and 73 is a flat with the nut 70. Shows a spring seat installed between the seat 72 and the seat.

Here, as shown in FIG. 4, one of the three pulleys 13 (the right pulley on the drawing) is the first pulley 6 2 and the second pulley 6 3. It is supported by a slide type pulley base consisting of

And this slide type pulley is constituted as follows. In other words, as shown in FIGS. 6 and 7, the male thread of the screw 65 and the collar 68 penetrate through the elongated hole 62 a of the first pulley base 62 and the hole of the second pulley base 63. I do. On the screw head side of the screw 65, a flat seat 67 having a diameter larger than the diameter of the elongated hole 62a is provided between the screw 65 and the collar 68. On the other hand, on the nut 70 side, between the nut 70 and the collar 68, 2 and a spring seat 73 are provided. Here, referring to FIG. 7, the length between both ends of the collar 68 is greater than the sum of the thickness of the first pulley base 62 and the thickness of the second pulley base 63. Thereby, the first pulley base 62 and the second pulley 63 can be smoothly slid and moved by the screws 65 and the nuts 70 without being tightened. In addition, the protrusion of the second pulley base 6 3 engaging with the elongated hole 6 2 a of the first pulley base 6 2 with the screw 65, the flat seats 67, 72, the nut 70, and the spring seat 73. Make The normal operation of the load detecting device configured as described above will be described.

First, the operating side wire 18 is alternately wound around the moving pulley 13 and the fixed pulley 16 as in the first embodiment. When the load in the car is heavier than the reference state, the detection pulley 35 rotates clockwise, and the sensor 32 detects the rotation angle. On the other hand, when the load in the car is lighter than the reference state, the detection pulley 35 rotates counterclockwise, and the sensor 32 detects the rotation angle.

At this time, as shown in FIG. 4, the first pulley base 62 is located at a position corresponding to the upper end of the movable range defined by the elongated hole 62a.

Next, the operation of the load detection device according to the second embodiment when an abnormality occurs will be described. First, also in the load detection device of the second embodiment, similarly to the first embodiment, when the detection value of the sensor 32 becomes larger than the maximum value or smaller than the minimum value, the control unit 33 The information is transmitted to the car and hoist, and measures are taken to prevent overloading of the car.

Then, as shown in FIG. 5, when the tension side wire 40 is broken, the above-mentioned slide type pulley mechanism functions as a rotation restricting member. FIG. 5 is a schematic diagram showing a state in which the tension-side wire is broken in the load detection device of FIG.

In FIG. 5, the tension side wire 40 is broken at the break P2. At this time, since the tension side wire 40 loses the tension for rotating the detection pulley 35 counterclockwise, the detection pulley 35 is moved clockwise by the operation side wire 18 (in the direction of the arrow in FIG. 5). )). When the rotation of the detection pulley 35 exceeds the normal detection range S, as described above, the control unit 33 is moved to the tension side. You will notice a break in wire 40.

Further, when the detection pulley 35 rotates beyond the normal detection range S, the moving pulley 13 associated with the slide-type pulley mechanism falls down in the shape of the elongated hole 62a, and the first pulley stand 62 stops at a position corresponding to the lower end of the movable range due to the elongated hole 62a. As a result, the rotation of the detection pulley 35 stops.

In this way, it is possible to reliably prevent a problem such as a disconnection of the harness in the sensor 32 due to the excessive rotation of the detection pulley 35 caused by the disconnection of the tension side wire 40.

As described above, in the load detection device according to the second embodiment, similarly to the first embodiment, even if the wire wound around the detection pulley as the rotating body is broken, It does not move up and down in an overloaded state, and further, there is no damage to components such as sensors, and high reliability can be obtained.

In the second embodiment, the elongated hole 62a is provided on the first pulley base 62 side, and the protrusion including the screw 65 and the like is provided on the second pulley base 63 side. On the other hand, even if the elongated hole 62 a is provided on the second pulley base 63 side and the protrusion is provided on the first pulley base 62 side, the same effect as in the second embodiment can be obtained. Will be.

Further, the slide type pulley base mechanism is not limited to the configuration shown in the second embodiment. For example, a stud is provided on the second pulley base 63, and the stud is connected to the elongated hole 62a. It is good also as composition which combines. Further, the position where the slide type pulley base mechanism is installed is not limited to the arrangement shown in the second embodiment, and for example, even if the slide type pulley base mechanism is provided for the moving pulley 13 in the center of the paper. Good. In each of the above embodiments, the acceleration sensor provided on the detection pulley 35 is used as the sensor 32, but the sensor in the present invention is not limited to this. The sensor applied to the present invention may be any sensor that can detect the rotation angle of the detection pulley. For example, a sensor of the present invention is configured by a so-called mouth encoder, in which a plurality of slits are provided on the rotation surface of the detection pulley, and the displacement of the slit is detected by an optical sensor installed outside the detection pulley. Is also good.

Further, in each of the above embodiments, the rotation when the operation side wire 18 is broken is described. Although the regulating member and the rotation regulating member when the tension side wire 40 is broken are separately provided, both the rotation regulating members may be collectively provided in one load detection device.

The rotation restricting member according to the present invention is not limited to the above embodiments. For example, a protrusion may be provided at a predetermined position on the rotation surface of the detection pulley 35, and the stopper member may be engaged with the protrusion. By providing the outside of the detection pulley 35, the rotation angle of the detection pulley 35 can be regulated.

In addition, the present invention is not limited to the above embodiments, and each embodiment may be appropriately changed within the scope of the technical idea of the present invention, in addition to those suggested in each embodiment. It is clear. Further, the number, position, shape, and the like of the above-mentioned constituent members are not limited to the above-described embodiment, and can be set to a number, position, shape, or the like suitable for carrying out the present invention. Industrial applicability

As described above, a load detection device according to the present invention is a load detection device including a sensor that detects a rotation angle of a rotating body that rotates in response to a load change, and based on a detection value of the sensor. To determine the state of the wire. This makes it possible to reliably recognize the breakage of the wire, and is useful as a load detection device that can avoid the burden on the elevator device due to raising and lowering the car in an overloaded state.

Further, the load detection device according to the present invention is for discriminating whether the wire is in a normal state or an abnormal state depending on whether or not the detection value of the sensor is within a predetermined range. This makes it possible to reliably recognize the breakage of the wire, and is useful as a load detection device capable of avoiding the burden on the elevator system by raising and lowering the car in an overloaded state.

Further, in the load detecting device according to the present invention, a normal range of the wire state is determined by adding or subtracting a margin from a value detected by a sensor under an allowable load or under no load. This makes it possible to reliably recognize the breakage of the wire, and thus is useful as a load detection device capable of avoiding the burden on the elevator apparatus caused by raising and lowering the car in an overloaded state. Further, a load detection device according to the present invention is a load detection device including a rotating body that rotates in response to a load change, and includes a rotation regulating member that regulates a rotation range of the rotating body. is there. As a result, even if the wire wound around the rotating body is broken, the rotation of the rotating body can be stopped at a predetermined rotation angle, thereby reducing damage to components such as sensors in the device. Useful as a load detector.

Further, the load detection device according to the present invention determines the state of the wire based on a detection value of a sensor that detects the rotation angle of the rotating body. Accordingly, since the rotation of the rotating body can be stopped at a predetermined rotation angle, it is useful as a load detection device that reduces damage to components such as sensors in the device. Furthermore, since the wire breakage can be reliably recognized, it is useful as a load detection device that can avoid the burden on the elevator device due to raising and lowering the car in an overloaded state.

Further, the load detection device according to the present invention is for discriminating whether the wire is in a normal state or an abnormal state depending on whether or not the detection value of the sensor is within a predetermined range. Thus, since the rotation of the rotating body can be stopped at a predetermined rotation angle, it is useful as a load detection device that reduces damage to components such as sensors in the device. Furthermore, since wire breakage can be reliably recognized, it is useful as a load detection device that can avoid the burden on the elevator system by raising and lowering the car in an overloaded state.

Further, in the load detecting device according to the present invention, a normal range of the wire state is determined by adding or subtracting a margin from a value detected by a sensor under an allowable load or under no load. Accordingly, since the rotation of the rotating body can be stopped at a predetermined rotation angle, it is useful as a load detection device in which damage to components such as sensors in the device is reduced. In addition, since wire breakage can be reliably recognized, it is useful as a load detection device that can avoid the burden on elevator equipment due to raising and lowering the car in an overloaded state.

Further, in the load detection device according to the present invention, the rotation restricting member restricts the supply of the rotating power to the rotating body by the rotating power supply unit connected to the tension side wire. Accordingly, since the rotation of the rotating body can be stopped at a predetermined rotation angle, it is useful as a load detecting device in which damage to components such as sensors in the device is reduced. Further, in the load detection device according to the present invention, the movable range of the tension spring as the turning power supply unit is limited by the regulation wire as the rotation regulating member. Accordingly, since the rotation of the rotating body can be stopped at a predetermined rotation angle, it is useful as a load detection device that reduces damage to components such as sensors in the device.

Further, in the load detection device according to the present invention, the rotation restricting member restricts the amount of movement of the moving pulley to restrict the supply of rotational power to the rotating body. Accordingly, since the rotation of the rotating body can be stopped at a predetermined rotation angle, it is useful as a load detection device that reduces damage to components such as sensors in the device.

Further, in the load detection device according to the present invention, the rotation restricting member includes a first pulley base and a second pulley base having a slide mechanism. Accordingly, since the rotation of the rotating body can be stopped at a predetermined rotation angle, it is useful as a load detection device that reduces damage to components such as sensors in the device.

Further, an elevator apparatus according to the present invention is an elevator apparatus provided with the improved load detecting device described above. This makes it possible to reliably recognize the breakage of the wire, and is useful as an elevator device that can avoid the burden on the device due to raising and lowering the car in an overloaded state. Further, since the rotation of the rotating body can be stopped at a predetermined rotation angle, it is useful as an elevator device in which damage to components such as sensors in the load detection device is reduced.

Further, the elevator apparatus according to the present invention identifies a wire state by a control unit based on a detection value of a sensor, and controls elevation of the car based on the identification result. This makes it possible to reliably recognize the breakage of the wire, and is useful as an elevator system that can avoid the load on the device caused by raising and lowering the car in an overloaded state.

Further, a control method of a load detection device according to the present invention is a control method of a load detection device including a sensor that detects a rotation angle of a rotating body that rotates in response to a load change.

The state of the wire is determined based on the detection value of the sensor. This makes it possible to reliably recognize the breakage of the wire, and is useful as a control method of a load detection device capable of avoiding a burden on the elevator device by raising and lowering the car in an overloaded state. In addition, the control method of the load detection device according to the present invention is to identify whether the wire is in a normal state or an abnormal state based on whether or not the detection value of the sensor is within a predetermined range. . This makes it possible to reliably recognize the breakage of the wire, and is useful as a control method of a load detection device that can avoid a burden on the elevator apparatus due to raising and lowering the car in an overloaded state.

Further, in the control method of the load detection device according to the present invention, a normal range of the wire state is determined by adding or subtracting a margin from a value detected by the sensor when an allowable load is applied or when no load is applied. This makes it possible to reliably recognize the breakage of the wire, and is useful as a control method of a load detection device capable of avoiding the burden on the elevator apparatus caused by raising and lowering the car in an overloaded state.

Claims

The scope of the claims

1. A rotating body around which the wire is wound and which rotates in conjunction with the movement of the wire;

A sensor for detecting a rotation angle of the rotating body,

A control unit for determining a state of the wire based on a detection value of the sensor.

2. The control unit determines that the wire is in a normal state when a value detected by the sensor is within a range between a predetermined maximum value and a minimum value of the detection value. The load detection device according to claim 1, wherein

3. The maximum value of the predetermined detection value is a value obtained by adding a margin to the detection value at the time of the allowable load, and the minimum value of the predetermined detection value is obtained by subtracting the margin from the detection value at the time of no load. 3. The load detection device according to claim 2, wherein

4. A rotating body around which the wire is wound and which rotates in conjunction with the movement of the wire;

A rotation restricting member for restricting a rotation range of the rotation body.

5. a sensor for detecting a rotation angle of the rotating body;

5. The load detection device according to claim 4, further comprising: a control unit configured to determine a state of the wire based on a value detected by the sensor.

6. The control unit determines that the wire is in a normal state when a value detected by the sensor is within a range between a predetermined maximum value and a minimum value of the detection value. The load detection device according to claim 5, wherein

7. The maximum value of the predetermined detection value is a value obtained by adding a margin to the detection value at the time of the allowable load, and the minimum value of the predetermined detection value is obtained by subtracting the margin from the detection value at the time of no load. 7. The load detection device according to claim 6, wherein the load detection device has a value obtained by the following method.

8. The wire includes a tension-side wire, one end of which is supported by the rotating body and the other end of which is supported by a turning power supply unit that applies a turning force to the rotating body in a no-load direction. The load detection device according to any one of claims 4 to 7, wherein the rotation restricting member is a member that restricts supply of rotational power by the rotational power supply unit.

9. The rotating power supply is a tension spring or a weight,

9. The load detecting device according to claim 8, wherein the rotation restricting member is a restricting wire having one end supported by the tension spring or the weight and the other end supported by a fixed portion.

10. The wire includes an operation-side wire, one end of which is supported by the rotating body and the other end of which is supported by a fixed portion via a moving pulley interlocking with the magnitude of the load. The load detecting device according to any one of claims 4 to 7, wherein: is a member that regulates a moving amount of the moving pulley.

11. The rotation restricting member has a first pulley base that supports the moving pulley and has a through hole or a projection, and a projection or a through hole that engages with the through hole or the projection. 10. The load detecting device according to claim 10, further comprising a second pulley base that enables the first pulley base to slide.

12. An elevator apparatus comprising the load detecting device according to any one of claims 1 to 11.

13. The elevator apparatus according to claim 12, wherein a lift of the car in the hoistway is regulated based on a detection result of the state of the wire by the load detection device.

14. A control method for a load detecting device comprising: a rotating body around which a wire is wound and which rotates in conjunction with the movement of the wire; and a sensor for detecting a rotating angle of the rotating body,

Determining a state of the wire based on a value detected by the sensor.

15. The step of determining the state of the wire includes determining that the wire is in a normal state when a value detected by the sensor is within a range between a predetermined maximum value and a minimum value of the detection value. The control method of the load detection device according to claim 14, wherein the determination step is a step of determining.

16. The maximum value of the predetermined detection value is a value obtained by adding a margin to the detection value at the time of an allowable load, and the minimum value of the predetermined detection value is a value of the detection value at the time of no load. The control method of the load detection device according to claim 15, wherein the value is a value obtained by subtraction.