Elevator weighing device

Abstract

The objective is to obtain an elevator weighing device that can accurately detect the load inside the elevator car while standardizing the components on which the sensors are mounted, regardless of the rated load capacity. [Solution] The connecting arm 52 is provided with two or more wire connection holes 52a spaced apart from each other in the longitudinal direction of the connecting arm 52. By selecting a wire connection hole 52a to which the detection wire 41 is connected from among the two or more wire connection holes 52a, the distance from the rotation center of the rotating body 50 to the connection point of the detection wire 41 to the rotating body 50 can be changed in stages.

Description

Technical Field

[0001] The present disclosure relates to a weighing device for an elevator.

Background Art

[0002] In a conventional load detection device, a sensor is fixed to a detection pulley. The detection pulley is connected to a wire fixing portion via a wire. As a result, the detection pulley rotates by an angle corresponding to the load in the car. The sensor generates a signal corresponding to the rotation angle of the detection pulley. The control unit detects the load in the car based on the signal from the sensor (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the conventional load detection device as described above, depending on the specifications of the sensor, there are upper and lower limits to the angle for accurately detecting the load. For example, in the case of an inclination sensor, in order to detect the inclination angle, it is necessary to use the linear part of the sine wave of the sensor output, so the available angle range is limited. In addition, the movement amount of the wire changes according to the rated load in the car. Therefore, depending on the difference in the rated load, it is necessary to use detection pulleys of different sizes.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to obtain a weighing device for an elevator that can accurately detect the load in the car while sharing the components on which the sensor is mounted regardless of the difference in the rated load.

Means for Solving the Problems

[0006] The elevator weighing device according to this disclosure includes a frame, a rotating body rotatably mounted on the frame, a sensor mounted on the rotating body that generates a signal corresponding to the rotation angle of the rotating body, and a detection wire connected to the rotating body. It also includes a transmission mechanism that rotates the rotating body according to the load inside the car, and the distance from the rotation center of the rotating body to the connection point of the detection wire to the rotating body can be changed. [Effects of the Invention]

[0007] According to the elevator weighing device of this disclosure, the load inside the car can be accurately detected while standardizing the components on which the sensors are mounted, regardless of the rated load capacity. [Brief explanation of the drawing]

[0008] [Figure 1] This is a schematic diagram showing an elevator according to Embodiment 1. [Figure 2] Figure 1 is a front view showing the weighing device. [Figure 3] Figure 2 is a front view showing the state of the weighing device when the load inside the cage in Figure 1 is greater than the standard value. [Figure 4] This is a front view showing the state after replacing the connecting arm in Figure 2 with another connecting arm. [Figure 5] This is a front view showing a weighing device according to Embodiment 2. [Figure 6] This is a front view showing a weighing device according to Embodiment 3. [Figure 7] This is a front view showing a weighing device according to Embodiment 4. [Figure 8] This is a front view showing a weighing device according to Embodiment 5. [Modes for carrying out the invention]

[0009] The embodiments will be described below with reference to the drawings. Embodiment 1. This is a schematic diagram showing an elevator according to Embodiment 1. In Figure 1, the elevator is shown unfolded on a single plane.

[0010] In the diagram, a support beam 12 is installed at the top of the elevator shaft 11. A hoisting machine 13 is supported by the support beam 12. The hoisting machine 13 consists of a hoisting machine body 14 and a drive sheave 15.

[0011] The hoisting machine body 14 includes a hoisting machine motor (not shown) and a hoisting machine brake (not shown). The hoisting machine motor rotates the drive sheave 15. The hoisting machine brake maintains the drive sheave 15 in a stationary state. The hoisting machine brake also brakes the rotation of the drive sheave 15.

[0012] Multiple suspension members 16 are wrapped around the drive sheave 15. In Figure 1, only one suspension member 16 is shown. Each suspension member 16 is made of rope or belt.

[0013] The elevator car 17 and the counterweight 18 are suspended within the elevator shaft 11 by the suspension body 16. The elevator car 17 and the counterweight 18 move up and down within the elevator shaft 11 by rotating the drive sheave 15.

[0014] Within the elevator shaft 11, there is a pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown). The pair of car guide rails guide the movement of the car 17. The pair of counterweight guide rails guide the movement of the counterweight 18.

[0015] The support beam 12 is provided with a first rope-fastening section 19 and a second rope-fastening section 20. The suspension body 16 has a first end 16a, which is one end in the longitudinal direction, and a second end 16b, which is the other end in the longitudinal direction. The first end 16a is connected to the first rope-fastening section 19. The second end 16b is connected to the second rope-fastening section 20.

[0016] At the lower part of the car 17, a first car hoist 21 and a second car hoist 22 are provided. At the upper part of the counterweight 18, a counterweight hoist 23 is provided.

[0017] The suspension body 16 is wound around the first car hoist 21, the second car hoist 22, the drive sheave 15, and the counterweight hoist 23 in order from the first end 16a side and reaches the second end 16b. That is, the elevator of Embodiment 1 is a machine roomless elevator with a 2:1 roping system.

[0018] In the hoistway 11, a control panel 24 is installed. The control panel 24 controls the operation of the car 17 by controlling the hoisting machine 13.

[0019] A weighing device 30 is supported by the support beam 12. A signal from the weighing device 30 is sent to the control panel 24. The control panel 24 detects the load in the car 17 based on the signal from the weighing device 30.

[0020] FIG. 2 is a front view showing the weighing device 30 of FIG. 1. The first wire fixing portion 19 has a plurality of shackle rods 25, a plurality of shackle springs 26, a plurality of spring seats 27, and a plurality of adjusting nuts 28.

[0021] Each shackle rod 25 penetrates the support beam 12. At the lower end of each shackle rod 25, a corresponding suspension body 16 is connected.

[0022] The plurality of shackle springs 26 are provided on the support beam 12. Each shackle rod 25 is passed through a corresponding shackle spring 26. Each shackle spring 26 expands and contracts according to the tension acting on the corresponding suspension body 16.

[0023] Each spring seat 27 is provided on a corresponding shackle spring 26. Each shackle rod 25 is passed through a corresponding spring seat 27.

[0024] Each adjustment nut 28 is screwed onto the shackle rod 25 on the corresponding spring seat 27. By adjusting the amount each adjustment nut 28 is tightened, the usable length of the corresponding shackle spring 26 is adjusted.

[0025] The weighing device 30 comprises a frame 31, a rotating body 50, a sensor 32, and a transmission mechanism 33.

[0026] The frame 31 is fixed on the support beam 12. The frame 31 also has a bottom portion 31a, a vertical portion 31b, and an upper portion 31c. The bottom portion 31a is fixed to the support beam 12. The vertical portion 31b protrudes upward perpendicular to the bottom portion 31a. The upper portion 31c protrudes perpendicularly from the upper end of the vertical portion 31b in the same direction as the bottom portion 31a.

[0027] The rotating body 50 is mounted on the vertical section 31b so as to be rotatable about a horizontal support shaft 44. The support shaft 44 is fixed to the vertical section 31b.

[0028] The rotating body 50 has a disc-shaped mounting member 51 and a connecting arm 52. The mounting member 51 is rotatably supported on the pivot shaft 44. As the mounting member 51, for example, a detection pulley similar to those used in conventional weighing devices can be used.

[0029] The connecting arm 52 is detachably attached to the mounting member 51. The connecting arm 52 is a flat, strip-shaped plate. The connecting arm 52 is rotatable together with the mounting member 51 around the support shaft 44. The connecting arm 52 protrudes from the mounting member 51 along its radial direction, on the side opposite to the first rope fastening portion 19.

[0030] A wire connection hole 52a is provided at the end of the connecting arm 52 opposite to the first rope fastening portion 19.

[0031] The sensor 32 is mounted on the mounting member 51. In Embodiment 1, the component on which the sensor 32 is mounted is the mounting member 51. The sensor 32 generates a signal according to the rotation angle of the rotating body 50. For example, a tilt sensor is used as the sensor 32.

[0032] The transmission mechanism 33 rotates the rotating body 50 in accordance with the load inside the cage 17. Figure 1 shows the state where the load inside the cage 17 is at a standard value. In this state, the connecting arm 52 is horizontal.

[0033] The transmission mechanism 33 includes a plurality of pulley bases 34, a plurality of fixing nuts 35, a plurality of movable pulleys 36, a plurality of fixed pulleys 37, a guide pulley 38, a threaded rod 39, a positioning nut 40, a detection wire 41, a tension wire 42, and a tension spring 43.

[0034] Each pulley base 34 is fixed to the upper end of the corresponding shackle rod 25 using a fixing nut 35. Each movable pulley 36 is supported by the corresponding movable pulley 36 so as to be rotatable about a horizontal axis of rotation. As a result, each movable pulley 36 is displaced vertically together with the corresponding shackle rod 25.

[0035] Multiple fixed pulleys 37 are positioned above multiple movable pulleys 36. Each fixed pulley 37 is mounted on the vertical section 31b so as to be rotatable about a horizontal axis of rotation.

[0036] The guide pulley 38 is positioned above the rotating body 50. The guide pulley 38 is also mounted on the vertical section 31b so as to be rotatable about a horizontal axis of rotation.

[0037] The threaded rod 39 is fixed to the upper surface portion 31c by a positioning nut 40. The vertical position of the threaded rod 39, that is, the amount of the threaded rod 39 protruding downward from the upper surface portion 31c, can be adjusted by turning the positioning nut 40.

[0038] The base end of the detection wire 41 is connected to the lower end of the threaded rod 39. The tip of the detection wire 41 is connected to the wire connection hole 52a of the connecting arm 52. The connection point of the detection wire 41 to the rotating body 50 is the wire connection hole 52a.

[0039] The middle section of the detection wire 41 is wound alternately around the movable pulley 36 and the fixed pulley 37. The detection wire 41 is also guided to the connecting arm 52 by being wound around the guide pulley 38.

[0040] The tension wire 42 is connected to the wire connection hole 52a of the connecting arm 52. The tension spring 43 is provided between the tension wire 42 and the bottom surface 31a.

[0041] If the load inside the cage 17 is greater than the reference value, each shackle rod 25 is displaced downward relative to the support beam 12, causing the detection wire 41 to be pulled. As a result, the rotating body 50 rotates clockwise from the state shown in Figure 2 against the tension spring 43, as shown in Figure 3.

[0042] When the load inside the cage 17 is less than the reference value, each shackle rod 25 is displaced upward relative to the support beam 12, thereby loosening the detection wire 41. As a result, the rotating body 50 rotates counterclockwise in Figure 2 by the tension spring 43. The tension spring 43, via the tension wire 42, imparts a rotational force to the rotating body 50 in the unloaded direction.

[0043] Figure 4 is a front view showing the state in which the connecting arm 52 in Figure 2 has been replaced with another connecting arm 53. A wire connection hole 53a is provided at the end of the other connecting arm 53 opposite to the first rope stopper 19. The detection wire 41 and the tension wire 42 are connected to the wire connection hole 53a. The connection point of the detection wire 41 to the rotating body 50 is the wire connection hole 53a.

[0044] The length of the other connecting arm 53 is different from the length of the connecting arm 52. As a result, the length from the center of rotation to the wire connection hole 53a on the other connecting arm 53 is different from the length from the center of rotation to the wire connection hole 52a on the connecting arm 52.

[0045] In this example, the length of the other connecting arm 53 is shorter than the length of the connecting arm 52. As a result, the length from the center of rotation to the wire connection hole 53a on the other connecting arm 53 is shorter than the length from the center of rotation to the wire connection hole 52a on the connecting arm 52.

[0046] Thus, in Embodiment 1, the connecting arm 52 is interchangeable with other connecting arms 53 of different lengths. This allows the distance from the rotation center of the rotating body 50 to the connection point of the detection wire 41 to the rotating body 50 to be changed.

[0047] In such a weighing device 30, the distance from the rotation center of the rotating body 50 to the connection point of the detection wire 41 to the rotating body 50 can be changed. As a result, for example, the amount of load inside the cage 17 required to rotate the rotating body 50 by the same angle will differ between the connecting arm 52 in Figure 2 and the other connecting arm 53 in Figure 4. Specifically, the load inside the cage 17 required to rotate the other connecting arm 53 in Figure 4 to the same angle as in Figure 3 will be smaller than when using the connecting arm 52 in Figure 2.

[0048] This allows the tilt angle of the sensor 32 to be kept within a certain range by selecting whether to attach the connecting arm 52 or the other connecting arm 53 to the mounting member 51, even when the rated load capacity is different. Therefore, the load inside the cage 17 can be detected accurately while keeping the mounting member 51 common to all vehicles with different rated load capacities.

[0049] Furthermore, by providing multiple types of connecting arms 53 with different lengths, it is possible to accommodate multiple elevators with different rated load capacities.

[0050] Embodiment 2. Next, Figure 5 is a front view showing the weighing device 30 according to Embodiment 2. The connecting arm 52 of Embodiment 2 is provided with an elongated hole 52b along the longitudinal direction of the connecting arm 52. A support shaft 44 passes through the elongated hole 52b.

[0051] The mounting position of the connecting arm 52 to the mounting member 51 can be continuously adjusted within the range of the elongated hole 52b. This allows the distance from the rotation center of the rotating body 50 to the wire connection hole 52a to be changed.

[0052] Other configurations in Embodiment 2 are the same as those in Embodiment 1.

[0053] This configuration also provides the same effects as in Embodiment 1. Furthermore, the common connecting arm 52 allows for compatibility with multiple elevators with different rated load capacities, thereby suppressing an increase in the number of component types.

[0054] In the second embodiment, the mounting position of the connecting arm 52 to the mounting member 51 may be discontinuous, i.e., adjustable in steps.

[0055] Furthermore, the configuration of Embodiment 2 may be combined with the configuration of Embodiment 1. In this case, elongated holes are also provided in the other connecting arms 53, which have a different length from the connecting arm 52. This allows for large differences in rated load capacity to be addressed by choosing between the connecting arm 52 and the other connecting arms 53, and small differences in rated load capacity to be addressed by adjusting the mounting position.

[0056] Embodiment 3. Next, Figure 6 is a front view showing the weighing device 30 according to Embodiment 3. The connecting arm 52 of Embodiment 3 is provided with two or more wire connection holes 52a spaced apart from each other in the longitudinal direction of the connecting arm 52. By selecting the wire connection hole 52a to which the detection wire 41 is connected from among the two or more wire connection holes 52a, the distance from the rotation center of the rotating body 50 to the connection point of the detection wire 41 to the rotating body 50 can be changed in stages.

[0057] Other configurations in Embodiment 3 are the same as those in Embodiment 1.

[0058] This configuration also provides the same effects as in Embodiment 1. Furthermore, the common connecting arm 52 allows for compatibility with multiple elevators with different rated load capacities, thereby suppressing an increase in the number of component types.

[0059] In the third embodiment, for example, a sliding member that can slide along the longitudinal direction of the connecting arm 52 may be provided on the connecting arm 52, and the detection wire 41 may be connected to the sliding member. In this case, the connection point of the detection wire 41 to the rotating body 50 is the sliding member. This makes it possible to continuously adjust the connection position of the detection wire 41 to the connecting arm 52.

[0060] Furthermore, the configuration of Embodiment 3 may be combined with the configuration of Embodiment 1. In this case, two or more wire connection holes 53a are provided on the other connecting arms 53, which have a different length from the connecting arm 52. This allows for large differences in rated load capacity to be addressed by choosing between the connecting arm 52 and the other connecting arms 53, and small differences in rated load capacity to be addressed by adjusting the connection position.

[0061] Embodiment 4. Next, Figure 7 is a front view showing the weighing device 30 according to Embodiment 4. In the weighing device 30 of Embodiment 4, in addition to the same configuration as in Embodiment 2, an elongated hole 31d is provided in the vertical portion 31b of the frame 31. The mounting position of the mounting member 51 to the frame 31 can be continuously adjusted within the range of the elongated hole 31d, along with the position of the support shaft 44.

[0062] The elongated hole 31d is provided along a direction parallel to the straight line connecting the center of rotation of the rotating body 50 and the wire connection hole 52a when the load inside the cage 17 is at a reference value. In this example, the longitudinal direction of the elongated hole 31d is the horizontal direction.

[0063] Other configurations in Embodiment 4 are the same as those in Embodiment 2.

[0064] This configuration also provides the same effects as in Embodiment 2. Furthermore, the mounting position of the mounting member 51 to the frame 31 can be changed depending on the mounting position of the connecting arm 52 to the mounting member 51. This allows for optimization of the component layout and makes the weighing device 30 more compact.

[0065] In the fourth embodiment, the mounting position of the mounting member 51 to the frame 31 may be discontinuous, or adjustable in steps, along with the position of the support shaft 44.

[0066] Furthermore, in embodiments 1 and 3, the mounting position of the mounting member 51 to the frame 31 may be adjustable, similar to embodiment 4.

[0067] Furthermore, in embodiments 1 to 4, the shape of the mounting member 51 is not limited to a disc shape. Also, the shape of the connecting arm 52 is not limited to a strip-shaped flat plate.

[0068] Embodiment 5. Next, Figure 8 is a front view showing the weighing device 30 according to Embodiment 5. The rotating body 50 of Embodiment 5 is composed only of connecting arms 52. Therefore, the sensor 32 is mounted on the end of the connecting arm 52 opposite to the wire connection hole 52a. In other words, the connecting arm 52 also serves as a mounting member.

[0069] The connecting arm 52 is rotatable about the support shaft 44. Similar to Embodiment 2, the connecting arm 52 is provided with an elongated hole 52b. This allows the mounting position of the connecting arm 52 on the support shaft 44 to be continuously adjusted within the range of the elongated hole 52b. Therefore, the distance from the rotation center of the rotating body 50 to the connection point of the detection wire 41 to the rotating body 50 can be changed.

[0070] Other configurations in Embodiment 5 are the same as those in Embodiment 2.

[0071] This configuration also provides the same effects as in Embodiment 2. Furthermore, it allows for miniaturization of the rotating body 50 and a reduction in the number of parts.

[0072] In Embodiment 5, the mounting position of the connecting arm 52 to the support shaft 44 may be discontinuous, i.e., adjustable in steps.

[0073] Furthermore, in Embodiment 5, the mounting position of the connecting arm 52 to the frame 31 may be adjustable along with the position of the support shaft 44.

[0074] Furthermore, the rotating body 50 of Embodiment 3 may be composed solely of connecting arms 52, similar to Embodiment 5.

[0075] Furthermore, in embodiments 1 to 5, the specific configuration of the transmission mechanism 33 is not limited to the examples described above.

[0076] Furthermore, in embodiments 1 to 5, the weighing device 30 may be provided on the second rope stopper 20.

[0077] Furthermore, the elevator may have a machine room. In this case, the first rope fastening section 19, the second rope fastening section 20, and the weighing device 30 may be installed in the machine room.

[0078] Furthermore, the type of elevator is not limited to the type shown in Figure 1; for example, a 1:1 roping system may also be used. In this case, the weighing device 30 may be installed on the car 17 or the counterweight 18.

[0079] Furthermore, the elevator may be a double-deck elevator, a single-shaft multi-car elevator, or the like. In a single-shaft multi-car elevator, the upper car and the lower car, located directly below the upper car, each move independently up and down a common hoistway. [Explanation of symbols]

[0080] 19 First rope stopper, 30 weighing device, 31 frame, 32 sensor, 33 transmission mechanism, 44 support shaft, 50 rotating body, 51 mounting member, 52 connecting arm, 52a wire connection hole (connection point), 53 other connecting arm, 53a wire connection hole (connection point).

Claims

1. Frame, A rotating body rotatably mounted on the aforementioned frame, A sensor mounted on the rotating body generates a signal corresponding to the rotation angle of the rotating body. It has a detection wire connected to the rotating body, and a transmission mechanism that rotates the rotating body according to the load inside the cage. Equipped with, An elevator weighing device in which the distance from the rotation center of the rotating body to the connection point of the detection wire to the rotating body can be changed.

2. The rotating body is A mounting member is provided rotatably on the frame and on which the sensor is mounted, A connecting arm is detachably attached to the aforementioned mounting member and to which the detection wire is connected. It has, The elevator weighing device according to claim 1, wherein the connecting arm is interchangeable with other connecting arms of different lengths.

3. The rotating body is A mounting member is provided rotatably on the frame and on which the sensor is mounted, A connecting arm is attached to the aforementioned mounting member and to which the detection wire is connected. It has, The elevator weighing device according to claim 1, wherein the mounting position of the connecting arm to the mounting member is adjustable, thereby allowing the distance from the rotation center to the connection point to be changed.

4. The rotating body is A mounting member is provided rotatably on the frame and on which the sensor is mounted, A connecting arm is attached to the aforementioned mounting member and to which the detection wire is connected. It has, The elevator weighing device according to claim 1, wherein the distance from the center of rotation to the connection point can be changed by adjusting the connection position of the detection wire to the connecting arm.

5. The mounting member is rotatable about a support shaft provided on the frame, The elevator weighing device according to any one of claims 2 to 4, wherein the mounting position of the mounted member with respect to the frame is adjustable together with the position of the support shaft.

6. The rotating body is composed of connecting arms which are strip-shaped flat plates. The connecting arm is rotatable about a pivot shaft provided in the frame, The elevator weighing device according to claim 1, wherein the mounting position of the connecting arm with respect to the support shaft is adjustable.

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