Weighing device for an elevator

Abstract

The present application provides a scale device of an elevator that can make the setting work easy. In the scale device (8) of the elevator, a pair of fixed columns (81) is fixed to a mounting surface (322a) of an upper beam (322) of a car (3). The upper beam (322) is deformed according to the magnitude of a load received from a suspension body (7) that suspends the car (3). A mounting member (82) is mounted to the pair of fixed columns (81). A strain sensor (83) is mounted to the mounting member (81). The pair of fixed columns (81) is located at positions separated from each other on the mounting surface (322a). The mounting member (82) is located at a position separated from the mounting surface (322a). The rigidity of the mounting member (82) is lower than the rigidity of each of the upper beam (322) and the pair of fixed columns (81). The strain sensor (83) can generate a signal corresponding to the strain amount of the mounting member (82).

Description

Technical Field

[0001] This disclosure relates to a weighing device for elevators. Background Technology

[0002] Patent Document 1 discloses an elevator car in which a weighing device for detecting the load loaded inside the car is installed between the car floor and the car frame. In the weighing device, a plunger is pressed against the lower surface of the car floor by a helical spring, and a coil is arranged around the plunger. When a load is loaded into the car, the plunger moves downward against the helical spring. The coil generates a voltage corresponding to the position of the plunger.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 6-321453 Summary of the Invention

[0006] The problem the invention aims to solve

[0007] In the conventional elevator car disclosed in Patent Document 1, a weighing device, which is composed of a plunger, a coil spring, a coil, etc., needs to be installed between the car floor and the car frame. Therefore, the work of installing the weighing device is labor-intensive.

[0008] This disclosure was made to solve the above-mentioned problems, and its purpose is to provide an elevator weighing device that makes the installation operation easier.

[0009] means for solving problems

[0010] The elevator weighing device disclosed herein comprises: a pair of fixed columns fixed to a mounting surface of a base material that deforms according to the magnitude of the load received from the suspension body of the suspended car; a mounting member mounted on the pair of fixed columns; and a strain sensor mounted on the mounting member, wherein the magnitude of the load received by the base material from the suspension body varies according to the weight of the load loaded in the car, the pair of fixed columns being located at a position separated from each other on the mounting surface, the mounting surface bending according to the deformation of the base material in a plane including the pair of fixed columns, the mounting member being located at a position separated from the mounting surface, the rigidity of the mounting member being lower than that of the base material and the pair of fixed columns, and the strain sensor being capable of generating a signal corresponding to the strain of the mounting member.

[0011] The effects of the invention

[0012] According to this disclosure, the installation of the weighing device in an elevator can be made easier. Attached Figure Description

[0013] Figure 1This is a schematic structural diagram showing the elevator according to Embodiment 1.

[0014] Figure 2 It is shown Figure 1 The front view of the car.

[0015] Figure 3 It is shown Figure 2 An enlarged view of the weighing device.

[0016] Figure 4 It shows that Figure 3 The structural diagram of the computational model obtained by modeling the upper beam and the weighing device.

[0017] Figure 5 It is shown Figure 4 The structural diagram of the calculation model of the upper beam when the upper beam is subjected to an upward load at its center.

[0018] Figure 6 It shows the direction Figure 4 The structural diagram of the computational model of the fixed column when a load is applied to the end of the fixed column in a direction orthogonal to the fixed column.

[0019] Figure 7 It shows the direction Figure 4 The structural diagram of the computational model of the mounting component when a tensile force is applied to the mounting component in the direction along the mounting component.

[0020] Figure 8 This is a front view showing the weighing device of the elevator according to Embodiment 2. Detailed Implementation

[0021] The embodiments of the present disclosure will be described with reference to the accompanying drawings. In the drawings, identical or equivalent parts are labeled with the same reference numerals, and repeated descriptions are simplified or omitted as appropriate. Furthermore, the present disclosure is not limited to the following embodiments; any structural elements of the embodiments can be modified or omitted without departing from the spirit of the present disclosure.

[0022] Implementation method 1.

[0023] Figure 1 This is a schematic structural diagram of the elevator according to Embodiment 1. In the diagram, a machine room 2 is provided at the upper part of the hoistway 1. The car 3 and counterweight 4 are arranged in the hoistway 1 in a manner that allows them to move vertically. A traction machine 5 and a deflector sheave 6 are provided in the machine room 2.

[0024] The traction machine 5 generates a driving force that moves the car 3 and the counterweight 4 in the vertical direction. The traction machine 5 has a traction machine body 51 and a drive sheave 52. The drive sheave 52 is rotatably mounted on the traction machine body 51. The traction machine body 51 rotates the drive sheave 52 by supplying power to the traction machine body 51. A deflector pulley 6 is positioned separately from the drive sheave 52.

[0025] Multiple suspension bodies 7 are wound around the drive rope pulley 52 and the deflector pulley 6. Figure 1 For simplicity, only one suspension body 7 is shown. The suspension body 7 uses ropes, belts, etc. Each suspension body 7 has a first end 71 and a second end 72. The first end 71 of each suspension body 7 is connected to the car 3. The second end 72 of each suspension body 7 is connected to the counterweight 4.

[0026] The car 3 and counterweight 4 are suspended from the hoistway 1 by multiple suspension bodies 7. Therefore, in this embodiment, the suspension method of the car 3 and counterweight 4 based on the suspension bodies 7 is a 1:1 rope winding method. The car 3 and counterweight 4 move vertically in the hoistway 1 by rotating the drive pulley 52.

[0027] Figure 2 It is shown Figure 1 The image shows a front view of the car 3. The car 3 has a car body 31 and a car frame 32. An entrance / exit (not shown) is provided on the car body 31. Passengers, goods, etc., can be loaded into the interior of the car body 31 through the entrance / exit. The car body 31 is supported on the car frame 32 by multiple vibration damping devices 33.

[0028] The car frame 32 surrounds the car body 31. The car frame 32 has a lower beam 321, an upper beam 322, and a pair of longitudinal columns 323. The lower beam 321 is located below the car body 31. The upper beam 322 is located above the car body 31. The lower beam 321 and the upper beam 322 are respectively arranged along the width direction of the car 3. The car body 31 is supported on the lower beam 321 by a plurality of vibration damping devices 33. One of the longitudinal columns 323 connects one end of the lower beam 321 and the upper beam 322 to each other. The other longitudinal column 323 connects the other end of the lower beam 321 and the upper beam 322 to each other. Thus, the car body 31 is arranged between the pair of longitudinal columns 323 in the width direction of the car 3.

[0029] The first end 71 of each suspension body 7 becomes a connecting rod. The first end 71 of each suspension body 7 is connected to the middle portion of the upper beam 322 in the width direction of the car 3 via a suspension body connector 73. As a result, the middle portion of the upper beam 322 receives an upward load from each suspension body 7. The upper beam 322 deforms according to the magnitude of the load received from each suspension body 7, thereby flexing upward at the middle portion of the upper beam 322.

[0030] The magnitude of the load on the upper beam 322 from each suspension body 7 varies according to the weight of the passengers, cargo, and other loads on the car body 31. Therefore, the upper beam 322 undergoes deformation corresponding to the weight of the loads on the car body 31.

[0031] The connection position of the first end 71 of each suspension body 7 relative to the upper beam 322 is symmetrical about the centerline of the car frame 32 in the width direction of the car 3. The centerline of the car frame 32 in the width direction of the car 3 is a straight line passing through the center of the upper beam 322 in the width direction of the car 3 along the vertical direction. Therefore, when the upper beam 322 deforms due to the load received by each suspension body 7, the upper beam 322 flexes in a shape symmetrical about the centerline of the car frame 32 in the width direction of the car 3.

[0032] A weighing device 8 is installed on the upper beam 322. The weighing device 8 is mounted on the mounting surface 322a of the upper beam 322. In this embodiment, the upper surface of the upper beam 322 is the mounting surface 322a of the upper beam 322. The weighing device 8 is arranged on the center line of the car frame 32 in the width direction of the car 3. The weighing device 8 uses the upper beam 322 as a base material and operates according to the deformation of the upper beam 322 as the base material. As a result, the weight of the load loaded on the car body 31 is detected.

[0033] Figure 3 It is shown Figure 2 An enlarged view of the weighing device 8. The weighing device 8 has a pair of fixed columns 81, a mounting component 82, and a strain sensor 83.

[0034] A pair of fixing posts 81 are fixed to the mounting surface 322a of the upper beam 322. Each fixing post 81 protrudes from the mounting surface 322a of the upper beam 322. Furthermore, the pair of fixing posts 81 are located at separate positions on the mounting surface 322a of the upper beam 322. In the plane containing the pair of fixing posts 81, the mounting surface 322a of the upper beam 322 bends accordingly with respect to the deformation of the upper beam 322 caused by the loads received by the upper beam 322 from each suspension body 7.

[0035] In this embodiment, each fixing post 81 protrudes from the mounting surface 322a in a direction orthogonal to the mounting surface 322a of the upper beam 322. In this embodiment, a pair of fixing posts 81 are located at positions separated from each other in the width direction of the car 3. Thus, in this embodiment, the plane containing the pair of fixing posts 81 is a plane orthogonal to the mounting surface 322a of the upper beam 322 and along the width direction of the car 3.

[0036] Mounting member 82 is mounted on a pair of fixed posts 81. Mounting member 82 is located separate from the mounting surface 322a of the upper beam 322. Mounting member 82 extends from one fixed post 81 to the other fixed post 81. Thus, one end of mounting member 82 is mounted on one fixed post 81, and the other end of mounting member 82 is mounted on the other fixed post 81. In this embodiment, mounting member 82 is plate-shaped.

[0037] The rigidity of the mounting component 82 is lower than that of the upper beam 322 and the pair of fixed columns 81. Therefore, the mounting component 82 is more prone to elastic deformation compared to the upper beam 322 and the pair of fixed columns 81. Spring steel or similar materials are used as the materials constituting the mounting component 82.

[0038] A strain sensor 83 is mounted on the mounting member 82. In this embodiment, the strain sensor 83 is mounted on the upper surface of the mounting member 82. The strain sensor 83 is capable of generating a signal corresponding to the strain of the mounting member 82 as a sensor signal. The sensor signal generated by the strain sensor 83 is sent to a control device (not shown). The control device detects the weight of the load based on the sensor signal from the strain sensor 83, and controls the operation of the elevator based on the detected weight of the load.

[0039] Next, the operation of the weighing device 8 will be explained. When passengers, goods, or other loads are loaded onto the car body 31 of the car 3, the upper beam 322 receives an upward load from each suspension body 7 corresponding to the weight of the load. As a result, the upper beam 322 deforms, and the upper beam 322 flexes upward at its middle portion. At this time, a pair of fixing columns 81, while following the mounting surface 322a of the upper beam 322, intend to displace in the following direction: compared to the position at the mounting surface 322a of the upper beam 322, the distance between the pair of fixing columns 81 is wider at the position of the mounting member 82. As a result, a tensile force corresponding to the increase in the distance between the pair of fixing columns 81 is applied from the pair of fixing columns 81 to the mounting member 82. At the position of the mounting member 82, the increase in the distance between the pair of fixing columns 81 is greater than the strain of the upper beam 322 caused by the deformation of the upper beam 322. Therefore, the strain generated by the installation component 82 is an amplified amount of strain in the upper beam 322 caused by the deformation of the upper beam 322.

[0040] When the mounting component 82 generates strain, amplified from the strain of the upper beam 322 caused by the deformation of the upper beam 322, a signal corresponding to the strain of the mounting component 82 is generated in the strain sensor 83 as a sensor signal, and the sensor signal is output from the strain sensor 83 to the control device. Subsequently, when the control device receives the sensor signal from the strain sensor 83, it detects the weight of the load loaded on the car body 31 based on the sensor signal, and controls the operation of the elevator based on the detected weight of the load.

[0041] Here, the higher the rigidity of the upper beam 322, the smaller the strain of the upper beam 322 when it is subjected to load from each suspension body 7. Therefore, when the strain sensor 83 is directly mounted on the upper beam 322, the higher the rigidity of the upper beam 322, the lower the output of the sensor signal from the strain sensor 83, and the lower the detection accuracy of the strain sensor 83 in detecting the strain of the upper beam 322.

[0042] In this embodiment, the strain sensor 83 generates a sensor signal corresponding to the strain of the mounting member 82 amplified from the strain of the upper beam 322, rather than a signal corresponding to the strain of the upper beam 322. Therefore, the output of the sensor signal from the strain sensor 83 is ensured regardless of the rigidity of the upper beam 322.

[0043] Next, the relationship between the strain of the upper beam 322 and the strain of the mounting member 82 when the upper beam 322 is subjected to an upward load from the suspension body 7 at the center of the upper beam 322 will be explained. Figure 4 It shows that Figure 3 The structural diagram of the computational model obtained by modeling the upper beam 322 and the weighing device 8 is shown. The support of the mounting surface 322a of the upper beam 322 to each fixed column 81 is a fixed support. The support of each fixed column 81 in a pair of fixed columns 81 to the mounting member 82 is a knife-edge support, i.e., a simple support. In addition, let the length of the upper beam 322 between a pair of longitudinal columns 323 be L1. In addition, let the length of each fixed column 81 be L2, and let the length of the mounting member 82 between a pair of fixed columns 81 be L3.

[0044] Furthermore, let the Young's modulus of the upper beam 322 be E1, the moment of inertia of the upper beam 322 be I1, and the section modulus of the upper beam 322 be Z1. Let the Young's modulus of each fixed column 81 be E2, and the moment of inertia of each fixed column 81 be I2. Let the Young's modulus of the mounting member 82 be E3, the moment of inertia of the mounting member 82 be I3, and the cross-sectional area of ​​the mounting member 82 be A3. Furthermore, I3 is less than I1 and I2. Therefore, the loads and moments exerted on the upper beam 322 by the fixed columns 81, as well as the displacement and tilt of the upper beam 322 caused by these loads, are ignored.

[0045] In addition, Figure 4 In this system, a Cartesian coordinate system with the installation position of the mounting component 82 relative to a fixed column 81 as the origin is applied to the upper beam 322 and the weighing device 8. In the Cartesian coordinate system, the axis along the width direction of the car 3 is set as the x-axis, and the axis along the vertical direction is set as the f(x) axis.

[0046] In this case, consider the states of the upper beam 322, the fixed column 81, and the mounting member 82 when the upper beam 322 is subjected to an upward load F1 from the suspension body 7 at the center of the upper beam 322.

[0047] Figure 5 It is shown Figure 4 The structural diagram of the calculation model of the upper beam 322 when it is subjected to an upward load F1 at the center of the upper beam 322. The inclination f'(x) of the upper beam 322 at coordinate x when it is subjected to an upward load F1 from the suspension body 7 at the center of the upper beam 322 is represented by the following equation (1). f'(x) represents the function obtained by differentiating f(x) at coordinate x.

[0048] [Formula 1]

[0049]

[0050] Therefore, the inclination θ at the coordinate x = (L1-L3) / 2 of the position where the fixed column 81 is fixed to the mounting surface 322a of the upper beam 322 is represented by the following formula (2).

[0051] [Formula 2]

[0052]

[0053] Since the tilt θ is small, the following relationship between equations (3) and (4) holds.

[0054] [Formula 3]

[0055] sinθ=θ…(3)

[0056] [Formula 4]

[0057] cosθ=1…(4)

[0058] on the other hand, Figure 6 It shows the direction Figure 4 The structural diagram of the calculation model of the fixed column 81 when a load F2 is applied to the end of the fixed column 81 in a direction orthogonal to the fixed column 81. The deflection δ2 of the fixed column 81 when a load F2 is applied to the end of the fixed column 81 in a direction orthogonal to the fixed column 81 is represented by the following equation (5).

[0059] [Formula 5]

[0060]

[0061] also, Figure 7 It shows the direction Figure 4 The structural diagram of the calculation model of the mounting member 82 when a tensile force F3 is applied to the mounting member 82 in the direction along the mounting member 82 is shown. The elongation δ3 of the mounting member 82 when a tensile force F3 is applied to the mounting member 82 in the direction along the mounting member 82 is expressed by the following equation (6).

[0062] [Formula 6]

[0063]

[0064] The mounting member 82 is mounted on the end of the fixed column 81. Therefore, the relationship between the load F2 and the tensile force F3 is expressed by the following equation (7). In addition, the relationship between the deflection δ2 and the elongation δ3 is expressed by the following equation (8).

[0065] [Formula 7]

[0066] F3=F2cosθ…(7)

[0067] [Formula 8]

[0068]

[0069] Therefore, according to equations (2) to (8), using load F1, load F2 is represented by the following equation (9).

[0070] [Formula 9]

[0071]

[0072] The strain ε1 of the upper beam 322 on the central mounting surface 322a of the upper beam 322 is represented by the following formula (10).

[0073] [Formula 10]

[0074]

[0075] The strain ε3 of the mounting component 82 is represented by the following equation (11).

[0076] [Formula 11]

[0077]

[0078] Therefore, according to equations (4), (7) and (9) to (11), the relationship between the strain ε1 of the upper beam 322 and the strain ε3 of the mounting component 82 is expressed by the following equation (12).

[0079] [Formula 12]

[0080]

[0081] Therefore, by adjusting the parameters of the upper beam 322, the fixed column 81, and the installation component 82, the ratio of the strain ε3 to the strain ε1 can be adjusted.

[0082] In the weighing device 8 of such an elevator, a pair of fixed columns 81 are fixed to the mounting surface 322a of the upper beam 322, which serves as the base material. The upper beam 322 deforms according to the magnitude of the load received from each suspension body 7 of the suspended car 3. The pair of fixed columns 81 are located separately from each other on the mounting surface 322a. In the plane containing the pair of fixed columns 81, the mounting surface 322a bends accordingly with the deformation of the upper beam 322. A mounting member 82 is mounted on the pair of fixed columns 81. The mounting member 82 is located separately from the mounting surface 322a. The rigidity of the mounting member 82 is lower than that of the upper beam 322 and the pair of fixed columns 81. A strain sensor 83 is capable of generating a signal corresponding to the strain of the mounting member 82.

[0083] Therefore, by installing mounting members 82 on a pair of fixed columns 81 fixed to the upper beam 322, and installing strain sensors 83 on the mounting members 82, the weighing device 8 can be installed. This eliminates the need to install the weighing device 8 between the car floor and the car frame, simplifying the installation process. Furthermore, the strain sensor 83 can generate a signal corresponding to the strain of the mounting member 82 amplified from the strain of the upper beam 322. This ensures the accuracy of the output of the strain sensor 83 and the detection of the weight of the load based on the signal from the strain sensor 83.

[0084] Implementation method 2.

[0085] Figure 8 This is a front view showing the weighing device of the elevator according to Embodiment 2. Figure 8 It is the same as in implementation method 1 Figure 3 The corresponding diagram. The weighing device 8 also has a pair of ribs 84.

[0086] A pair of ribs 84 are correspondingly configured with a pair of fixing posts 81. One of the ribs 84 is fixed to one fixing post 81 and fixed to the mounting surface 322a. The other rib 84 is fixed to the other fixing post 81 and fixed to the mounting surface 322a.

[0087] Each rib 84 is disposed on a plane containing a pair of fixing posts 81. In this embodiment, the pair of ribs 84 is disposed between the pair of fixing posts 81. The rigidity of each rib 84 is higher than the rigidity of the mounting member 82. Other structures are the same as in Embodiment 1.

[0088] In this weighing device 8, one rib 84 is fixed to a fixed post 81 and fixed to the mounting surface 322a, and another rib 84 is fixed to another fixed post 81 and fixed to the mounting surface 322a. Therefore, the fixed posts 81 are less prone to bending, and the strain of the mounting member 82 can be reliably amplified from the strain of the upper beam 322. This further ensures the accuracy of the weight detection based on the signal from the strain sensor 83.

[0089] In embodiment 2, a pair of ribs 84 are respectively fixed to a pair of fixing posts 81. However, it is also possible to fix the rib 84 to only one fixing post 81. In this case, the rib 84 is also fixed to the mounting surface 322a. In this way, it is also possible to prevent one fixing post 81 from bending, and to further reliably ensure the accuracy of the weight detection of the load. That is, it is sufficient that at least one of the pair of fixing posts 81 is fixed with a rib 84 fixed to the mounting surface 322a.

[0090] Furthermore, in embodiment 2, instead of a pair of ribs 84, one rib can be fixed to each of the pair of fixed posts 81. In this case, one rib is also fixed to the mounting surface 322a. In this way, the accuracy of the load weight detection can be further reliably ensured.

[0091] Furthermore, in each of the above embodiments, the mounting surface 322a of fixing the pair of fixing posts 81 becomes the upper surface of the upper beam 322. However, the mounting surface 322a of fixing the pair of fixing posts 81 can also be set as the lower surface of the upper beam 322. In this case, when the upper beam 322 is subjected to an upward load from each suspension body 7, the pair of fixing posts 81 tend to displace in the direction that the distance between the pair of fixing posts 81 decreases at the position of the mounting member 82. Therefore, a compressive force corresponding to the amount of reduction in the distance between the pair of fixing posts 81 is applied from the pair of fixing posts 81 to the mounting member 82, and the mounting member 82 generates a strain amplified from the strain of the upper beam 322 caused by the deformation of the upper beam 322. In this way, the installation of the weighing device 8 can be made easier, and the detection accuracy of the weight of the load detected based on the signal from the strain sensor 83 can be ensured.

[0092] Furthermore, in each of the above embodiments, the suspension method of the car 3 and counterweight 4 based on the suspension body 7 is a 1:1 rope winding method. However, in a machine room-less elevator without a machine room, the suspension method of the car 3 and counterweight 4 based on the suspension body 7 can also be a 2:1 rope winding method. In this case, the first end 71 of each suspension body 7 is connected to a first fixed beam fixed to the upper part of the hoistway 1, and the second end 72 of each suspension body 7 is connected to a second fixed beam fixed to the upper part of the hoistway 1. In addition, a car sheave is provided in the car 3, and a counterweight sheave is provided in the counterweight 4. The car 3 and counterweight 4 are suspended in the hoistway 1 by the suspension bodies 7 that are wound around the car sheave and the counterweight sheave. As a result, the first fixed beam deforms according to the magnitude of the load received from the suspension body 7 suspending the car 3. Therefore, by using the first fixed beam as the base material and fixing a pair of fixed columns 81 of the weighing device 8 on the upper or lower surface of the first fixed beam as the base material, the mounting member 82 can generate a strain amplified from the strain of the first fixed beam.

[0093] The above-described embodiments illustrate one example of the content of this disclosure. These embodiments can be combined with other known technologies. A portion of the structure of the embodiments can be omitted or modified without departing from the spirit of this disclosure.

[0094] Explanation of reference numerals in the attached figures

[0095] 3 Car, 7 Suspension body, 8 Weighing device, 81 Fixed column, 82 Mounting component, 83 Strain sensor, 84 Rib, 322 Upper beam (base material), 322a Mounting surface.

Claims

1. A weighing device for an elevator, wherein, The elevator's weighing device includes: A pair of fixed posts, which are fixed to the mounting surface of the base material that deforms according to the magnitude of the load received from the suspension body of the suspended car; Mounting components, which are mounted on the pair of fixed posts; and The strain sensor is mounted on the mounting component. The magnitude of the load on the base material from the suspension body varies depending on the weight of the load loaded in the car. The pair of fixed posts are located at positions separate from each other on the mounting surface. In the plane containing the pair of fixed posts, the mounting surface bends according to the deformation of the base material. The mounting component is located at a position separated from the mounting surface. The rigidity of the mounting component is lower than that of the base material and the pair of fixing posts. The strain sensor is capable of generating a signal corresponding to the strain of the mounting component.

2. The elevator weighing device according to claim 1, wherein, The weighing device includes a rib, which is fixed to at least one of the pair of fixed posts and to the mounting surface. The ribs are arranged in a plane containing the pair of fixed posts.

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