Elevator weighing device

Abstract

The present invention comprises: first load detectors (2a, 7a); a first angle detector (6da); a second angle detector (6ab); a third angle detector (6bc); and a calculation unit (9a) that calculates the total of loads applied to first to fourth elastic members (5a to 5b) by using loads detected by the first load detectors (2a, 7a), an angle detected by the first angle detector (6da), a distance between the center of the first elastic member (5a) and the center of the fourth elastic member (5d), an angle detected by the second angle detector (6ab), a distance between the center of the first elastic member (5a) and the center of the second elastic member (5b), an angle detected by the third angle detector (6bc), a distance between the center of the second elastic member (5b) and the center of the third elastic member (5c), and elastic constants of the first to fourth elastic members (5a to 5b).

Description

Technical Field

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

Background Art

[0002] In a conventional elevator weighing device, support springs that support the floor surface of the car are provided at the four corners under the floor of the car, respectively, and displacement measuring devices installed near each support spring measure the displacement amount of the floor surface due to the elastic deformation of each support spring at each of the four corners. Then, using the voltage values output by each displacement measuring device, the sum of the loads applied to each support spring, that is, the load applied to the floor surface, is calculated. (For example, see 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 above conventional elevator weighing device, since load detectors including sensors for detecting physical quantities necessary for calculating loads, such as displacement measuring devices, are installed at all four corners under the floor, it is necessary to perform an initial setting to adjust the outputs of each sensor included in each load detector to be approximately the same, and there is a problem that the installation work takes time. On the other hand, if the number of load detectors to be installed is reduced, although the work time for the initial setting can be reduced, there is a problem that the load cannot be accurately calculated when there is a bias in the load applied to the floor surface.

[0005] The present disclosure has been made to solve the above problems, and an object thereof is to obtain an elevator weighing device that can reduce the amount of installation work and accurately calculate the load applied to the floor surface of the car.

Means for Solving the Problems

[0006] The elevator weighing device according to this disclosure is an elevator weighing device that calculates the sum of the loads on a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member that support the floor surface of the elevator car at the four corners beneath the floor of the elevator car, and comprises a first load detector for detecting the load on the first elastic member, a first angle detector for detecting the angle between the horizontal plane and the floor surface in a cross section perpendicular to the horizontal plane passing through the center of the first elastic member and the center of the fourth elastic member, a second angle detector for detecting the angle between the horizontal plane and the floor surface in a cross section perpendicular to the horizontal plane passing through the center of the first elastic member and the center of the second elastic member, and The system includes a third angle detector for detecting the angle between a horizontal plane and the floor, and a calculation unit for calculating the sum of the loads applied to the first, second, third, and fourth elastic members using the load detected by the first load detector, the angle detected by the first angle detector, the distance between the center of the first elastic member and the center of the fourth elastic member, the angle detected by the second angle detector, the distance between the center of the first elastic member and the center of the second elastic member, the angle detected by the third angle detector, the distance between the center of the second elastic member and the center of the third elastic member, the elastic constant of the first elastic member, the elastic constant of the second elastic member, the elastic constant of the third elastic member, and the elastic constant of the fourth elastic member.

[0007] Furthermore, the elevator weighing device according to this disclosure is an elevator weighing device that calculates the sum of the loads applied to a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member that support the floor surface of the elevator car at the four corners beneath the floor of the elevator car, and comprises a first load detector for detecting the load applied to the first elastic member, a second load detector for detecting the load applied to the second elastic member, a first angle detector for detecting the angle between the horizontal plane and the floor surface in a cross section perpendicular to the horizontal plane passing through the center of the first elastic member and the center of the fourth elastic member, and a horizontal plane in a cross section perpendicular to the horizontal plane passing through the center of the second elastic member and the center of the third elastic member. The system comprises a second angle detector for detecting the angle between a plane and the floor, and a calculation unit for calculating the sum of the loads applied to the first, second, third, and fourth elastic members using the load detected by the first load detector, the load detected by the second load detector, the angle detected by the first angle detector, the distance between the center of the first elastic member and the center of the fourth elastic member, the angle detected by the second angle detector, the distance between the center of the second elastic member and the center of the third elastic member, the elastic constant of the first elastic member, the elastic constant of the second elastic member, the elastic constant of the third elastic member, and the elastic constant of the fourth elastic member.

[0008] Furthermore, the elevator weighing device according to this disclosure is an elevator weighing device that calculates the sum of the loads applied to a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member that support the floor surface of the elevator car at the four corners beneath the floor of the elevator car, and comprises a first load detector for detecting the load applied to the first elastic member, a second load detector for detecting the load applied to the third elastic member, a first angle detector for detecting the angle between the horizontal plane and the floor surface in a cross section passing through the center of the first elastic member and the center of the fourth elastic member and perpendicular to the horizontal plane, and a cross section passing through the center of the first elastic member and the center of the second elastic member and perpendicular to the horizontal plane The system includes a second angle detector for detecting the angle between the horizontal plane and the floor on the surface, and a calculation unit for calculating the sum of the loads on the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member using the load detected by the first load detector, the load detected by the second load detector, the angle detected by the first angle detector, the distance between the center of the first elastic member and the center of the fourth elastic member, the angle detected by the second angle detector, the distance between the center of the first elastic member and the center of the second elastic member, the elastic constant of the first elastic member, the elastic constant of the second elastic member, and the elastic constant of the fourth elastic member.

[0009] Furthermore, the elevator weighing device according to this disclosure is an elevator weighing device that calculates the sum of the loads applied to a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member that support the floor surface of the elevator car at the four corners beneath the floor of the elevator car, and comprises a first load detector for detecting the load applied to the first elastic member, a second load detector for detecting the load applied to the second elastic member, a third load detector for detecting the load applied to the third elastic member, and a device that passes through the center of the first elastic member and the center of the fourth elastic member perpendicular to the horizontal plane. The system includes a first angle detector that detects the angle between the horizontal plane and the floor in a cross-section, and a calculation unit that calculates the sum of the loads applied to the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member using the load detected by the first load detector, the load detected by the second load detector, the load detected by the third load detector, the angle detected by the first angle detector, the distance between the center of the first elastic member and the center of the fourth elastic member, the elastic constant of the first elastic member, and the elastic constant of the fourth elastic member. [Effects of the Invention]

[0010] According to this disclosure, the amount of installation work can be reduced, and the load on the cage floor can be accurately calculated. [Brief explanation of the drawing]

[0011] [Figure 1] This is a view from above of the underside of the elevator car floor in Embodiment 1. [Figure 2] This is a front view of the elevator car in Embodiment 1. [Figure 3] This is a block diagram showing the configuration of the elevator weighing device in Embodiment 1. [Figure 4] This figure schematically shows the angle θda in Embodiment 1. [Figure 5] This figure schematically shows the angle θab in Embodiment 1. [Figure 6] This figure schematically shows the angle θbc in Embodiment 1. [Figure 7]It is a view of the underside of the elevator car in Embodiment 2 as seen from above. [Figure 8] It is a front view of the elevator car in Embodiment 2. [Figure 9] It is a block diagram showing the configuration of the weighing device of the elevator in Embodiment 2. [Figure 10] It is a view of the underside of the elevator car in Embodiment 3 as seen from above. [Figure 11] It is a block diagram showing the configuration of the weighing device of the elevator in Embodiment 3. [Figure 12] It is a view of the underside of the elevator car in Embodiment 4 as seen from above. [Figure 13] It is a block diagram showing the configuration of the weighing device of the elevator in Embodiment 4. [Figure 14] It is a view of the underside of the elevator car in Embodiment 5 as seen from above. [Figure 15] It is a front view of the elevator car in Embodiment 5.

Embodiments for Carrying Out the Invention

[0012] Embodiment 1. The configuration of the weighing device of the elevator in Embodiment 1 will be described. FIG. 1 is a view of the underside of the elevator car 3 in Embodiment 1 as seen from above, and FIG. 2 is a front view of the elevator car 3 in Embodiment 1. Note that the view from the lower side to the upper side of the paper surface of FIG. 1 corresponds to FIG. 2. In FIGS. 1 and 2, a floor receiving frame 1 is provided below the floor surface 4 of the car 3 (hereinafter, may be referred to as "underside of the floor"), and between the floor receiving frame 1 and the floor surface 4 of the car 3, springs 5a, 5b, 5c, 5d, which are elastic members that support the lower surfaces of the floor surface 4, are provided.

[0013] The floor surface 4 of the car 3 has a substantially rectangular shape when viewed from above.

[0014] The bed receiving frame 1 has a rod shape. Four bed receiving frames 1 are provided along the four sides of the floor surface 4 of the basket 3, and as seen from above, it has a generally rectangular shape as a whole. Here, the positions of the bed receiving frame 1 corresponding to the four corners of the floor surface 4 of the basket 3 are respectively referred to as corners 8a, 8b, 8c, and 8d. Springs 5a, 5b, 5c, 5d are respectively provided at the corners 8a, 8b, 8c, 8d on the bed receiving frame 1, and support the four corners of the floor surface 4 from below.

[0015] Each of the springs 5a, 5b, 5c, 5d has the same elastic characteristics and has, for example, a horseshoe shape as shown in FIG. 2. And the two straight portions of the horseshoe shape are respectively provided so as to contact the lower surface of the bed receiving frame 1 and the floor surface 4 of the basket 3. When a person or an object enters the basket 3 and a load is applied to the floor surface 4 of the basket 3, the springs 5a, 5b, 5c, 5d elastically deform in the compressed direction, that is, downward in FIG. 2. Incidentally, hereinafter, the springs 5a, 5b, 5c, 5d may be respectively referred to as the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member.

[0016] A differential transformer 2a, which is a displacement sensor, is provided at the corner 8a of the bed receiving frame 1. The differential transformer 2a is communicably connected to a detection unit 7a described later, and the differential transformer 2a and the detection unit 7a constitute a load detector for detecting the load applied to the spring 5a. When a load is applied to the floor surface 4 of the basket 3, the spring 5a elastically deforms downward, and accordingly, the floor surface 4 is displaced downward. The differential transformer 2a measures the displacement amount accompanying the elastic deformation of the spring 5a, that is, the vertical relative position of the floor surface 4 of the basket 3 with respect to the bed receiving frame 1, and outputs an electromotive force having a voltage corresponding to the relative position. Thus, the differential transformer is a device that converts mechanical displacement into a voltage proportional to the displacement amount. When a plurality of differential transformers are used in one device, it is necessary to perform an initial setting so that the outputs of each differential transformer are of the same degree, and the amount of work involved in installation is large. Incidentally, hereinafter, the load detector composed of the differential transformer 2a and the detection unit 7a may be referred to as the first load detector.

[0017] Angle sensors 6da, 6ab, and 6bc are provided on the underside of the floor surface 4 of the cage 3. Angle sensor 6da is provided on a straight line connecting the center of spring 5a and the center of spring 5d, angle sensor 6ab is provided on a straight line connecting the center of spring 5a and the center of spring 5b, and angle sensor 6bc is provided on a straight line connecting the center of spring 5b and the center of spring 5c. Angle sensor 6da detects the angle θda between the horizontal plane in a cross section perpendicular to the horizontal plane, passing through the centers of spring 5d and spring 5a, and the floor surface 4 of the cage 3. Angle sensor 6ab detects the angle θab between the horizontal plane in a cross section perpendicular to the horizontal plane, passing through the centers of spring 5a and spring 5b, and the floor surface 4 of the cage 3. Angle sensor 6bc detects the angle θbc between the horizontal plane in a cross section perpendicular to the horizontal plane, passing through the centers of spring 5b and spring 5c, and the floor surface 4 of the cage 3. In the following, angle sensors 6da, 6ab, and 6bc may be referred to as the first angle detector, the second angle detector, and the third angle detector, respectively.

[0018] Figure 3 is a block diagram showing the configuration of the elevator weighing device in Embodiment 1. Here, the loads on springs 5a, 5b, 5c, and 5d are denoted as Wa, Wb, Wc, and Wd, respectively. Also, the total load on the entire floor surface 4 of the elevator car 3, i.e., the sum of Wa, Wb, Wc, and Wd, is denoted as Wall.

[0019] In Figure 3, the elevator weighing device in Embodiment 1 comprises a differential transformer 2a, a detection unit 7a to which the output from the differential transformer 2a is input, angle sensors 6da, 6ab, and 6bc, a storage unit 10a, and a calculation unit 9a to which the outputs from the detection unit 7a, angle sensors 6da, 6ab, and 6bc, and the storage unit 10a are input.

[0020] The detection unit 7a calculates the load Wa acting on the spring 5a using the voltage value of the electromotive force output by the differential transformer 2a. Specifically, for example, Wa can be calculated using the spring constant Ka of the spring 5a and the displacement due to the elastic deformation of the spring 5a, based on Hooke's Law. The calculated value of the load Wa is input to the calculation unit 9a. The function of the detection unit 7a is realized by the elevator control panel.

[0021] The memory unit 10a stores the spring constants Ka, Kb, Kc, and Kd of springs 5a, 5b, 5c, and 5d. However, in Embodiment 1, since springs 5a, 5b, 5c, and 5d have the same elastic properties, their spring constants Ka, Kb, Kc, and Kd are assumed to be equal, with Ka=Kb=Kc=Kd=K, and the value of K is stored. Furthermore, the memory unit 10a stores the distance between the centers of two springs provided at both ends of each floor support frame 1, which is equipped with angle sensors 6da, 6ab, and 6bc. Specifically, the distance between the center of spring 5d and the center of spring 5a, the distance between the center of spring 5a and the center of spring 5b, and the distance between the center of spring 5b and the center of spring 5c ​​are stored. However, in Embodiment 1, since the four floor support frames 1 combined form a roughly rectangular shape overall, the distance between the center of spring 5d and the center of spring 5a, and the distance between the center of spring 5b and the center of spring 5c ​​are assumed to be equal, and the value of distance BB is stored as these distances. The value of distance AA is stored as the distance between the center of spring 5a and the center of spring 5b. The storage unit 10a is provided in the elevator control panel.

[0022] The calculation unit 9a uses the load Wa output from the detection unit 7a, the angles θda, θab, and θbc output from the angle sensors 6da, 6ab, and 6bc respectively, and the spring constant K, distance AA, and distance BB output from the storage unit 10a to calculate the sum of the loads Wall on springs 5a, 5b, 5c, and 5d. The Wall calculated by the calculation unit 9a is output to, for example, a determination unit (not shown), which is used to determine whether the load on the floor surface 4 of the elevator car 3 exceeds a predetermined standard value. The function of the calculation unit 9a is implemented by the elevator control panel. The function of the determination unit (not shown) is also implemented by the elevator control panel.

[0023] Next, we will specifically explain the operation of the elevator weighing device in Embodiment 1, that is, the method for calculating the total load Wall applied to the floor surface 4 of the elevator car 3.

[0024] First, the method for detecting the load Wa applied to the spring 5a will be explained. The differential transformer 2a measures the amount of displacement due to the elastic deformation of the spring 5a, that is, the vertical relative position of the floor surface 4 of the cage 3 with respect to the floor support frame 1, and outputs an electromotive force having a voltage corresponding to that relative position to the detection unit 7a. The detection unit 7a uses the voltage value of the electromotive force output from the differential transformer 2a to calculate the load Wa applied to the spring 5a. Here, the load Wa is assumed to be Wa1. The calculated Wa1 is input to the calculation unit 9a.

[0025] Next, we will explain how to calculate the load Wd on spring 5d and the load Wb on spring 5b. Although corners 8b and 8d do not have differential transformers, the adjacent corner 8a has a differential transformer 2a. The loads Wb and Wd on springs 5b and 5d, respectively, installed in corners 8b and 8d, can be calculated using the method described later.

[0026] The load Wd acting on spring 5d is calculated using Wa1, which is the detection result of the load detector composed of the differential transformer 2a and the detection unit 7a; the angle θda detected by the angle sensor 6da installed between spring 5d and spring 5a; the distance BB between the centers of spring 5d and spring 5a; the spring constant Kd of spring 5d; and the spring constant Ka of spring 5a.

[0027] Figure 4 schematically shows the angle θda between the horizontal plane and the floor surface 4 of the cage 3 in a cross section perpendicular to the horizontal plane, passing through the centers of springs 5d and 5a. For simplification, in Figure 4, springs 5a and 5d are schematically shown as coil shapes, and the differential transformer 2a and angle sensor 6da are omitted from the illustration. The θda shown in Figure 4 can be expressed using Wd, Wa1, BB, Kd, ​​and Ka as shown in Equation 1 below.

[0028]

number

[0029] By rearranging equation 1 and substituting Kd=Ka=K, Wd can be expressed as shown in equation 2 below.

[0030]

number

[0031] The load Wb on spring 5b is calculated in the same way as the load Wd on spring 5d, using Wa1, which is the detection result of the load detector composed of the differential transformer 2a and the detection unit 7a, the angle θab detected by the angle sensor 6ab installed between spring 5a and spring 5b, the distance AA between the centers of spring 5a and spring 5b, and the spring constants Ka of spring 5a and Kb of spring 5b.

[0032] Figure 5 schematically shows the angle θab between the horizontal plane and the floor surface 4 of the cage 3 in a cross section perpendicular to the horizontal plane, passing through the centers of springs 5a and 5b. For simplification, in Figure 5, springs 5a and 5b are schematically shown as coil shapes, and the differential transformer 2a and angle sensor 6ab are not shown. The θab shown in Figure 5 can be expressed using Wa1, Wb, AA, Ka, and Kb as shown in Equation 3 below.

[0033]

number

[0034] By rearranging equation 3 and substituting Ka=Kb=K, Wb can be expressed as shown in equation 4 below.

[0035]

number

[0036] Next, we will explain how to calculate the load Wc acting on spring 5c. No differential transformer is provided in corner 8c, nor are there any differential transformers in corners 8b and 8d, which are located next to corner 8c. The load Wc acting on spring 5c ​​in such a corner 8c can be calculated using the load Wb acting on spring 5b in corner 8b, the angle θbc detected by the angle sensor 6bc installed between spring 5b and spring 5c, the distance BB between the centers of spring 5b and spring 5c, the spring constant Kb of spring 5b, and the spring constant Kc of spring 5c.

[0037] Figure 6 schematically shows the angle θbc between the horizontal plane and the floor surface 4 of the cage 3 in a cross section perpendicular to the horizontal plane, passing through the centers of springs 5b and 5c. For simplification, in Figure 6, springs 5b and 5c are schematically shown as coil shapes, and the angle sensor 6bc is not shown. The θbc shown in Figure 6 can be expressed using Wb, Wc, BB, Kb, and Kc as shown in Equation 5 below.

[0038]

number

[0039] By transforming equation 5 and substituting Kb=Kc=K and Wb, which is expressed in equation 4, Wc can be expressed as shown in equation 6 below.

[0040]

number

[0041] Using Wa (Wa1), Wd (Equation 2), Wb (Equation 4), and Wc (Equation 6) as explained above, the sum of the loads on springs 5a, 5b, 5c, and 5d, that is, the sum of the loads on the floor surface 4 of cage 3, Wall, is expressed as shown in Equation 7 below. The calculation unit 9a calculates Wall using Equation 7.

[0042]

number

[0043] As described above, the elevator weighing device in Embodiment 1 is an elevator weighing device that calculates the sum of the loads on the first elastic spring 5a, the second elastic spring 5b, the third elastic spring 5c, and the fourth elastic spring 5d, which support the floor surface 4 of the elevator car 3 at the four corners under the floor of the elevator car 3, and comprises a differential transformer 2a and a detection unit 7a, which are first load detectors that detect the load on spring 5a; an angle sensor 6da, which is a first angle detector that detects the angle θda between the horizontal plane and the floor surface 4 in a cross section passing through the centers of spring 5a and spring 5d and perpendicular to the horizontal plane; an angle sensor 6ab, which is a second angle detector that detects the angle θab between the horizontal plane and the floor surface 4 in a cross section passing through the centers of spring 5a and spring 5b and perpendicular to the horizontal plane; and spring The system includes an angle sensor 6bc, which is a third angle detector that detects the angle θbc between the horizontal plane and the floor surface 4 in a cross section perpendicular to the horizontal plane, passing through the centers of 5b and spring 5c; and a calculation unit 9a that calculates the sum of the loads Wall on springs 5a, 5b, 5c, and 5d using the load Wa1 detected by the differential transformer 2a and detection unit 7a, the angle θda detected by the angle sensor 6da, the distance BB between the center of spring 5a and the center of spring 5d, the angle θab detected by the angle sensor 6ab, the distance AA between the center of spring 5a and the center of spring 5b, the angle θbc detected by the angle sensor 6bc, the distance BB between the center of spring 5b and the center of spring 5c, the spring constant Ka of spring 5a, the spring constant Kb of spring 5b, the spring constant Kc of spring 5c, and the spring constant Kd of spring 5d. This reduces the number of load detectors, including differential transformers which are displacement sensors, thus reducing the amount of installation work and allowing for accurate calculation of the load on the floor surface 4 of the cage 3.

[0044] Furthermore, since springs 5a, 5b, 5c, and 5d, which have the same elastic properties, are used, the calculation unit 9a performs the calculation assuming that the spring constants Ka of spring 5a, Kb of spring 5b, Kc of spring 5c, and Kd of spring 5d are equal. This simplifies the calculation.

[0045] In Embodiment 1, springs 5a, 5b, 5c, and 5d having the same elastic properties were used. However, in reality, there are some errors, and the spring constants Ka, Kb, Kc, and Kd of springs 5a, 5b, 5c, and 5d are not necessarily exactly the same. To calculate Wall more accurately, the calculation unit 9a can use the respective values ​​of the spring constants Ka, Kb, Kc, and Kd. In this case, Wall is expressed as shown in Equation 8 below. Equation 8 can also be used in the same way when springs 5a, 5b, 5c, and 5d are intentionally used to have different elastic properties.

[0046]

number

[0047] In Embodiment 1, four rod-shaped floor support frames 1 were used in combination, but the system is not limited to this configuration. For example, one floor support frame 1 having the same shape as the overall shape formed by combining four rod-shaped floor support frames 1 may be provided, or two L-shaped floor support frames 1 may be combined to form a similar shape.

[0048] In Embodiment 1, horseshoe-shaped springs were used as springs 5a, 5b, 5c, and 5d, but other shapes of springs, such as coil-shaped springs, may also be used.

[0049] In Embodiment 1, the functions of the detection unit 7a and the calculation unit 9a are implemented by the elevator control panel, but this is not limited to that. For example, the functions of the detection unit 7a and the calculation unit 9a may be implemented by a computer different from the elevator control panel, or by an elevator control server.

[0050] In Embodiment 1, the storage unit 10a was provided in the elevator control panel, but this is not the only possible configuration. For example, an external device other than the elevator control panel may have the storage unit 10a, and the calculation unit 9a may communicate with this external device.

[0051] In Embodiment 1, a load detector was constructed using a differential transformer 2a, which is a displacement sensor, and a detection unit 7a, and the load applied to the spring 5a was detected by this load detector. However, a load sensor that directly detects the load, such as a load cell, may also be used to detect the load applied to the spring 5a.

[0052] In Embodiment 1, angles θda, θab, and θbc were detected using angle sensors 6da, 6ab, and 6bc, respectively. However, instead of directly detecting angles θda, θab, and θbc, an angle detector may be configured using a sensor that detects physical quantities other than angles and a detection unit that calculates angles θda, θab, and θbc using the physical quantities detected by the sensor.

[0053] In Embodiment 1, springs 5a, 5b, 5c, and 5d are provided at the four corners beneath the floor of the cage 3 to support the floor surface 4, but elastic members other than springs may be used instead of springs 5a, 5b, 5c, and 5d. If elastic members other than springs are used, the calculation unit 9a uses the elastic constant of the elastic member to calculate Wall.

[0054] In Embodiment 1, the load Wc on spring 5c ​​was calculated using the load Wb on spring 5b located at corner 8b, the angle θbc detected by angle sensor 6bc located between spring 5b and spring 5c, the distance BB between the centers of spring 5b and spring 5c, the spring constant Kb of spring 5b, and the spring constant Kc of spring 5c. However, if angle sensor 6cd is provided between spring 5c ​​and spring 5d, Wc can also be calculated using the load Wd on spring 5d located at corner 8d, the angle θcd detected by angle sensor 6cd located between spring 5c ​​and spring 5d, the distance AA between the centers of spring 5c ​​and spring 5d, the spring constant Kc of spring 5c, and the spring constant Kd of spring 5d. In this case, assuming Kc=Kd=K, the total load Wall can be expressed as shown in equation 9 below.

[0055]

number

[0056] Embodiment 2. The configuration of the elevator weighing device in Embodiment 2 will now be described. Figure 7 is a view of the underside of the elevator car 3 in Embodiment 2, seen from above, and Figure 8 is a front view of the elevator car 3 in Embodiment 2. Figure 8 corresponds to a view of Figure 7 from the bottom of the paper toward the top of the paper. The elevator weighing device in Embodiment 2 differs from the elevator weighing device in Embodiment 1 in that differential transformers 2a and 2b, which are displacement sensors, are provided at the corners 8a and 8b of the floor support frame 1, respectively, and angle sensors 6da and 6bc are provided on the underside of the floor surface 4 of the car 3. Components identical to those in Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0057] The differential transformer 2a is connected to the detection unit 7b in a communicative manner, and the differential transformer 2a and the detection unit 7b constitute a load detector that detects the load applied to the spring 5a. Similarly, the differential transformer 2b is connected to the detection unit 7b in a communicative manner, and the differential transformer 2b and the detection unit 7b constitute a load detector that detects the load applied to the spring 5b. In the following, the load detector composed of the differential transformer 2a and the detection unit 7b may be referred to as the first load detector, and the load detector composed of the differential transformer 2b and the detection unit 7b may be referred to as the second load detector. Furthermore, the angle sensors 6da and 6bc may be referred to as the first angle detector and the second angle detector, respectively.

[0058] Figure 9 is a block diagram showing the configuration of the elevator weighing device in Embodiment 2. In Figure 9, the elevator weighing device in Embodiment 2 comprises differential transformers 2a and 2b, a detection unit 7b to which the outputs from the differential transformers 2a and 2b are input, angle sensors 6da and 6bc, a storage unit 10b, and a calculation unit 9b to which the outputs from the detection unit 7b, angle sensors 6da and 6bc, and storage unit 10b are input.

[0059] The detection unit 7b uses the voltage values ​​of the electromotive forces output by the differential transformers 2a and 2b, respectively, to calculate the loads Wa and Wb acting on the springs 5a and 5b. The calculated load values ​​Wa and Wb are input to the calculation unit 9b. The function of the detection unit 7b is implemented by the elevator control panel.

[0060] The memory unit 10b stores the spring constants Ka, Kb, Kc, and Kd of springs 5a, 5b, 5c, and 5d. However, in Embodiment 2, since springs 5a, 5b, 5c, and 5d have the same elastic properties, their spring constants Ka, Kb, Kc, and Kd are assumed to be equal, so Ka=Kb=Kc=Kd=K, and the value of K is stored. Furthermore, the memory unit 10b stores the distance between the centers of two springs provided at both ends of each floor support frame 1, which is equipped with angle sensors 6da and 6bc. Specifically, the distance between the center of spring 5d and the center of spring 5a, and the distance between the center of spring 5b and the center of spring 5c ​​are stored. Here, in Embodiment 2, since the combined shape of the four floor support frames 1 is approximately rectangular, the distance between the center of spring 5d and the center of spring 5a, and the distance between the center of spring 5b and the center of spring 5c ​​are assumed to be equal, and the value of distance BB is stored as these distances. Furthermore, the memory unit 10b is installed in the elevator control panel.

[0061] The calculation unit 9b uses the loads Wa and Wb output from the detection unit 7b, the angles θda and θbc output from the angle sensors 6da and 6bc respectively, and the spring constant K and distance BB output from the storage unit 10b to calculate the sum of the loads Wall on springs 5a, 5b, 5c, and 5d. The Wall calculated by the calculation unit 9b is output to, for example, a determination unit (not shown), which is used to determine whether the load on the floor surface 4 of the elevator car 3 exceeds a predetermined standard value. The function of the calculation unit 9b is implemented by the elevator control panel.

[0062] Next, we will specifically explain the operation of the elevator weighing device in Embodiment 2, that is, the method for calculating the total load Wall applied to the floor surface 4 of the elevator car 3.

[0063] First, the method for detecting the loads Wa and Wb acting on springs 5a and 5b will be explained. Differential transformers 2a and 2b measure the displacement amount due to the elastic deformation of springs 5a and 5b, that is, the vertical relative position of the floor surface 4 of the cage 3 with respect to the floor support frame 1, and output electromotive forces with voltages corresponding to these relative positions to the detection unit 7b. The detection unit 7b uses the voltage values ​​of the electromotive forces output from the differential transformers 2a and 2b to calculate the loads Wa and Wb acting on springs 5a and 5b, respectively. Here, load Wa is assumed to be Wa1 and load Wb is assumed to be Wb1. The calculated Wa1 and Wb1 are input to the calculation unit 9b.

[0064] Next, we will explain how to calculate the load Wd on spring 5d and the load Wc on spring 5c. Although no differential transformers are provided at corners 8d and 8c, differential transformers 2a and 2b are provided at corner 8a adjacent to corner 8d and corner 8b adjacent to corner 8c, respectively. The load Wd on spring 5d at such corner 8d is expressed as shown in Equation 2, similar to Embodiment 1. The load Wc on springs 5c at each corner 8c can be calculated using the method described later.

[0065] The load Wd acting on spring 5d is calculated using Wa1, which is the detection result of the load detector composed of the differential transformer 2a and the detection unit 7b; the angle θda detected by the angle sensor 6da installed between spring 5d and spring 5a; the distance BB between the centers of spring 5d and spring 5a; the spring constant Kd of spring 5d; and the spring constant Ka of spring 5a.

[0066] The load Wc acting on spring 5c ​​is calculated in the same way as the load Wd acting on spring 5d, using Wb1, which is the detection result of the load detector composed of the differential transformer 2b and the detection unit 7b, the angle θbc detected by the angle sensor 6bc installed between spring 5b and spring 5c, the distance BB between the centers of spring 5b and spring 5c, and the spring constants Kb of spring 5b and Kc of spring 5c.

[0067] The angle θbc is expressed using Wb1, Wc, BB, Kb, and Kc as shown in equation 10 below.

[0068]

number

[0069] By rearranging equation 10 and substituting Kb=Kc=K, Wc can be expressed as shown in equation 11 below.

[0070]

number

[0071] Using Wa (Wa1), Wb (Wb1), Wd (Equation 2), and Wc (Equation 11) as explained above, the sum of the loads on springs 5a, 5b, 5c, and 5d, that is, the sum of the loads on the floor surface 4 of cage 3, Wall, is expressed as shown in Equation 12 below. The calculation unit 9b calculates Wall using Equation 12.

[0072]

number

[0073] As described above, the elevator weighing device in Embodiment 2 is an elevator weighing device that calculates the sum of the loads on the first elastic spring 5a, the second elastic spring 5b, the third elastic spring 5c, and the fourth elastic spring 5d that support the floor surface 4 of the elevator car 3 at the four corners under the floor of the elevator car 3, and comprises a differential transformer 2a and detection unit 7b which are first load detectors for detecting the load on spring 5a, a differential transformer 2b and detection unit 7b which are second load detectors for detecting the load on spring 5b, an angle sensor 6da which is a first angle detector for detecting the angle θda between the horizontal plane and the floor surface in a cross section perpendicular to the horizontal plane passing through the centers of spring 5a and spring 5d, and the center of spring 5b The system includes an angle sensor 6bc, which is a second angle detector that detects the angle between the horizontal plane and the floor surface in a cross section perpendicular to the horizontal plane passing through the center of spring 5c, and a calculation unit 9b that calculates the sum of the loads on springs 5a, 5b, 5c, and 5d using the load Wa1 detected by the differential transformer 2a and detection unit 7b, the load Wb1 detected by the differential transformer 2b and detection unit 7b, the angle θda detected by the angle sensor 6da, the distance BB between the center of spring 5a and the center of spring 5d, the angle θbc detected by the angle sensor 6bc, the distance BB between the center of spring 5b and the center of spring 5c, the spring constant Ka of spring 5a, the spring constant Kb of spring 5b, the spring constant Kc of spring 5c, and the spring constant Kd of spring 5d. This reduces the number of load detectors, including the differential transformer which is a displacement sensor, thus reducing the amount of installation work and allowing for accurate calculation of the load on the floor surface 4 of the cage 3.

[0074] Furthermore, since springs 5a, 5b, 5c, and 5d, which have the same elastic properties, are used, the calculation unit 9b performs the calculation assuming that the spring constants Ka of spring 5a, Kb of spring 5b, Kc of spring 5c, and Kd of spring 5d are equal. This simplifies the calculation.

[0075] In Embodiment 2, springs 5a, 5b, 5c, and 5d having the same elastic properties were used. However, in reality, there are some errors, and the spring constants Ka, Kb, Kc, and Kd of springs 5a, 5b, 5c, and 5d are not necessarily exactly the same. To calculate Wall more accurately, the calculation unit 9b can use the respective values ​​of the spring constants Ka, Kb, Kc, and Kd. In this case, Wall is expressed as shown in Equation 13 below. Equation 13 can also be used in the same way when springs 5a, 5b, 5c, and 5d are intentionally used to have different elastic properties.

[0076]

number

[0077] In Embodiment 2, the detection unit 7b calculated the loads Wa and Wb on the springs 5a and 5b using the outputs from the differential transformers 2a and 2b, respectively. However, it is also possible to provide a detection unit that calculates the load Wa on the spring 5a using the output from the differential transformer 2a, and a detection unit that calculates the load Wb on the spring 5b using the output from the differential transformer 2b.

[0078] Embodiment 3. The configuration of the elevator weighing device in Embodiment 3 will now be described. Figure 10 is a view of the underside of the elevator car 3 in Embodiment 3, seen from above. The front view of the elevator car 3 in Embodiment 3 is the same as in Figure 2. Note that the view of Figure 10 from the bottom of the paper toward the top of the paper corresponds to Figure 2. The elevator weighing device in Embodiment 3 differs from the elevator weighing device in Embodiment 1 in that differential transformers 2a and 2c, which are displacement sensors, are provided at the corners 8a and 8c of the floor support frame 1, respectively, and angle sensors 6da and 6ab are provided on the underside of the floor surface 4 of the car 3. Note that components identical to those in Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0079] The differential transformer 2a is connected to the detection unit 7c in a communicative manner and constitutes a load detector that detects the load applied to the spring 5a by the differential transformer 2a and the detection unit 7c. Similarly, the differential transformer 2c is connected to the detection unit 7c in a communicative manner and constitutes a load detector that detects the load applied to the spring 5c ​​by the differential transformer 2c and the detection unit 7c. In the following, the load detector composed of the differential transformer 2a and the detection unit 7c may be referred to as the first load detector, and the load detector composed of the differential transformer 2c and the detection unit 7c may be referred to as the second load detector. Furthermore, the angle sensors 6da and 6ab may be referred to as the first angle detector and the second angle detector, respectively.

[0080] Figure 11 is a block diagram showing the configuration of the elevator weighing device in Embodiment 3. In Figure 11, the elevator weighing device in Embodiment 3 comprises differential transformers 2a and 2c, a detection unit 7c to which the outputs from the differential transformers 2a and 2c are input, angle sensors 6da and 6ab, a storage unit 10c, and a calculation unit 9c to which the outputs from the detection unit 7c, angle sensors 6da and 6ab, and storage unit 10c are input.

[0081] The detection unit 7c uses the voltage values ​​of the electromotive forces output by the differential transformers 2a and 2c, respectively, to calculate the loads Wa and Wc acting on the springs 5a and 5c, respectively. The calculated values ​​of loads Wa and Wc are input to the calculation unit 9c. The function of the detection unit 7c is implemented by the elevator control panel.

[0082] The memory unit 10c stores the spring constants Ka, Kb, and Kd of springs 5a, 5b, and 5d. However, in Embodiment 3, since springs 5a, 5b, and 5d have the same elastic properties, their spring constants Ka, Kb, and Kd are assumed to be equal, with Ka=Kb=Kd=K, and the value of K is stored. Furthermore, the memory unit 10c stores the distance between the centers of two springs provided at both ends of each floor support frame 1, which is equipped with angle sensors 6da and 6ab. Specifically, the distance BB between the center of spring 5d and the center of spring 5a, and the distance AA between the center of spring 5a and the center of spring 5b are stored. The memory unit 10c is also provided in the elevator control panel.

[0083] The calculation unit 9c uses the loads Wa and Wc output from the detection unit 7c, the angles θda and θab output from the angle sensors 6da and 6ab respectively, and the spring constant K, distance AA, and BB output from the storage unit 10c to calculate the sum of the loads Wall on springs 5a, 5b, 5c, and 5d. The Wall calculated by the calculation unit 9c is output to, for example, a determination unit (not shown), which is used to determine whether the load on the floor surface 4 of the car 3 exceeds a predetermined standard value. The function of the calculation unit 9c is implemented by the elevator control panel.

[0084] Next, we will specifically describe the operation of the elevator weighing device in Embodiment 3, that is, the method for calculating the total load Wall applied to the floor surface 4 of the elevator car 3.

[0085] First, the method for detecting the loads Wa and Wc acting on springs 5a and 5c will be explained. Differential transformers 2a and 2c measure the displacement amount due to the elastic deformation of springs 5a and 5c, that is, the vertical relative position of the cage 3 on the floor surface 4 with respect to the floor support frame 1, and output electromotive forces with voltages corresponding to these relative positions to the detection unit 7c. The detection unit 7c uses the voltage values ​​of the electromotive forces output from the differential transformers 2a and 2c to calculate the loads Wa and Wc acting on springs 5a and 5c, respectively. Here, load Wa is assumed to be Wa1 and load Wc is assumed to be Wc1. The calculated Wa1 and Wc1 are input to the calculation unit 9c.

[0086] Next, we will explain how to calculate the load Wd on spring 5d and the load Wb on spring 5b. Although no differential transformers are provided at corners 8d and 8b, a differential transformer 2a is provided at corner 8a adjacent to corners 8d and 8b. The load Wd on spring 5d at such corner 8d is expressed as shown in Equation 2, as in Embodiment 1. Similarly, the load Wb on spring 5b at corner 8b is expressed as shown in Equation 4, as in Embodiment 1.

[0087] Using Wa(Wa1), Wc(Wc1), Wd(Equation 2), and Wb(Equation 4) as explained above, the sum of the loads on springs 5a, 5b, 5c, and 5d, i.e., the sum of the loads on the floor surface 4 of cage 3, Wall, is expressed as shown in Equation 14 below. The calculation unit 9c calculates Wall using Equation 14.

[0088]

number

[0089] As described above, the elevator weighing device in Embodiment 3 is an elevator weighing device that calculates the sum of the loads applied to the first elastic spring 5a, the second elastic spring 5b, the third elastic spring 5c, and the fourth elastic spring 5d, which support the floor surface 4 of the elevator car 3 at the four corners beneath the floor of the elevator car 3, and comprises a differential transformer 2a and a detection unit 7c, which are first load detectors for detecting the load applied to spring 5a; a differential transformer 2c and a detection unit 7c, which are second load detectors for detecting the load applied to spring 5c; and an angle sensor 6da, which is a first angle detector for detecting the angle θda between the horizontal plane and the floor surface in a cross section perpendicular to the horizontal plane passing through the centers of spring 5a and spring 5d. The system includes an angle sensor 6ab, which is a second angle detector that detects the angle between the horizontal plane and the floor surface in a cross section perpendicular to the horizontal plane, passing through the centers of springs 5a and 5b; and a calculation unit 9c that calculates the sum of the loads on springs 5a, 5b, and 5d using the load Wa1 detected by the differential transformer 2a and detection unit 7c, the load Wc1 detected by the differential transformer 2c and detection unit 7c, the angle θda detected by the angle sensor 6da, the distance BB between the centers of springs 5a and 5d, the angle θab detected by the angle sensor 6ab, the distance AA between the centers of springs 5a and 5b, the spring constant Ka of spring 5a, the spring constant Kb of spring 5b, and the spring constant Kd of spring 5d. This reduces the number of load detectors, including the differential transformer which is a displacement sensor, thus reducing the amount of installation work and allowing for accurate calculation of the load on the floor surface 4 of the cage 3.

[0090] Furthermore, since springs 5a, 5b, and 5d, which have the same elastic properties, are used, the calculation unit 9c performs the calculation assuming that the spring constants Ka of spring 5a, Kb of spring 5b, and Kd of spring 5d are equal. This simplifies the calculation.

[0091] In Embodiment 3, springs 5a, 5b, and 5d having the same elastic properties were used, but in reality there are some errors, and the spring constants Ka, Kb, and Kd of springs 5a, 5b, and 5d are not necessarily exactly the same. To calculate Wall more accurately, the calculation unit 9c can use the respective values ​​of the spring constants Ka, Kb, and Kd. In this case, Wall is expressed as shown in the following equation 15. Note that equation 15 can also be used in the same way when springs 5a, 5b, and 5d are intentionally used with different elastic properties. In this case, the memory unit 10c only needs to store three types of spring constants: Ka, Kb, and Kd, and does not need to store the spring constant Kc.

[0092]

number

[0093] In Embodiment 3, the detection unit 7c calculated the loads Wa and Wc on the springs 5a and 5c using the outputs from the differential transformers 2a and 2c, respectively. However, a detection unit that calculates the load Wa on the spring 5a using the output from the differential transformer 2a and a detection unit that calculates the load Wc on the spring 5c ​​using the output from the differential transformer 2c may also be provided.

[0094] Furthermore, if an angle sensor 6cd is installed between spring 5d and spring 5c, Wd can also be calculated using the load Wc applied to spring 5c ​​at corner 8c, the angle θcd detected by the angle sensor 6cd installed between spring 5c ​​and spring 5d, the distance AA between the centers of spring 5c ​​and spring 5d, the spring constant Kc of spring 5c, and the spring constant Kd of spring 5d. Additionally, if an angle sensor 6bc is installed between spring 5b and spring 5c, Wb can also be calculated using the load Wc applied to spring 5c ​​at corner 8c, the angle θbc detected by the angle sensor 6bc installed between spring 5b and spring 5c, the distance BB between the centers of spring 5c ​​and spring 5b, the spring constant Kc of spring 5c, and the spring constant Kb of spring 5b. In this case, assuming Kb=Kc=Kd=K, the sum of the loads Wall can be expressed as shown in equation 16 below.

[0095]

number

[0096] Embodiment 4. The configuration of the elevator weighing device in Embodiment 4 will now be described. Figure 12 is a view of the underside of the elevator car 3 in Embodiment 4, seen from above. The front view of the elevator car 3 in Embodiment 4 is the same as in Figure 8. Note that the view of Figure 12 from the bottom of the paper towards the top of the paper corresponds to Figure 8. The elevator weighing device in Embodiment 4 differs from the elevator weighing device in Embodiment 1 in that differential transformers 2a, 2b, and 2c, which are displacement sensors, are provided at the corners 8a, 8b, and 8c of the floor support frame 1, respectively, and an angle sensor 6da is provided on the underside of the floor surface 4 of the car 3. Note that components identical to those in Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0097] The differential transformer 2a is connected to the detection unit 7d in a communicative manner and constitutes a load detector that detects the load applied to the spring 5a by the differential transformer 2a and the detection unit 7d. The differential transformer 2b is connected to the detection unit 7d in a communicative manner and constitutes a load detector that detects the load applied to the spring 5b by the differential transformer 2b and the detection unit 7d. The differential transformer 2c is connected to the detection unit 7d in a communicative manner and constitutes a load detector that detects the load applied to the spring 5c ​​by the differential transformer 2c and the detection unit 7d. In the following, the load detector composed of the differential transformer 2a and the detection unit 7d may be referred to as the first load detector, the load detector composed of the differential transformer 2b and the detection unit 7d as the second load detector, and the load detector composed of the differential transformer 2c and the detection unit 7d as the third load detector. The angle sensor 6da may also be referred to as the first angle detector.

[0098] Figure 13 is a block diagram showing the configuration of the elevator weighing device in Embodiment 4. In Figure 13, the elevator weighing device in Embodiment 4 comprises differential transformers 2a, 2b, and 2c, a detection unit 7d to which the outputs from the differential transformers 2a, 2b, and 2c are input, an angle sensor 6da, a storage unit 10d, and a calculation unit 9d to which the outputs from the detection unit 7d, the angle sensor 6da, and the storage unit 10d are input.

[0099] The detection unit 7d uses the voltage values ​​of the electromotive forces output by the differential transformers 2a, 2b, and 2c, respectively, to calculate the loads Wa, Wb, and Wc acting on the springs 5a, 5b, and 5c, respectively. The calculated load values ​​Wa, Wb, and Wc are input to the calculation unit 9d. The function of the detection unit 7d is implemented by the elevator control panel.

[0100] The memory unit 10d stores the spring constants Ka and Kd of springs 5a and 5d. However, in Embodiment 4, since springs 5a and 5d have the same elastic properties, the spring constants Ka and Kb are assumed to be equal, so Ka=Kd=K, and the value of K is stored. Furthermore, the memory unit 10d stores the distance BB between the center of spring 5d and the center of spring 5a. The memory unit 10d is also installed in the elevator control panel.

[0101] The calculation unit 9d uses the loads Wa, Wb, and Wc output from the detection unit 7d, the angle θda output from the angle sensor 6da, and the spring constant K and distance BB output from the storage unit 10d to calculate the sum of the loads Wall on springs 5a, 5b, 5c, and 5d. The Wall calculated by the calculation unit 9d is output to, for example, a determination unit (not shown), which is used to determine whether the load on the floor surface 4 of the car 3 exceeds a predetermined standard value. The function of the calculation unit 9d is implemented by the elevator control panel.

[0102] Next, we will specifically explain the operation of the elevator weighing device in Embodiment 4, that is, the method for calculating the total load Wall applied to the floor surface 4 of the elevator car 3.

[0103] First, the method for detecting the loads Wa, Wb, and Wc acting on springs 5a, 5b, and 5c will be explained. Differential transformers 2a, 2b, and 2c measure the displacement amount due to the elastic deformation of springs 5a, 5b, and 5c, that is, the vertical relative position of the cage 3 on the floor surface 4 with respect to the floor support frame 1, and output electromotive forces with voltages corresponding to these relative positions to the detection unit 7d. The detection unit 7d uses the voltage values ​​of the electromotive forces output from the differential transformers 2a, 2b, and 2c to calculate the loads Wa, Wb, and Wc acting on springs 5a, 5b, and 5c, respectively. Here, load Wa is assumed to be Wa1, load Wb to be Wb1, and load Wc to be Wc1. The calculated Wa1, Wb1, and Wc1 are input to the calculation unit 9d.

[0104] Next, we will explain how to calculate the load Wd acting on spring 5d. Although no differential transformer is provided at corner 8d, a differential transformer 2a is provided at the adjacent corner 8a. The load Wd acting on spring 5d at such corner 8d is expressed as shown in Equation 2, similar to Embodiment 1.

[0105] Using Wa(Wa1), Wb(Wb1), Wc(Wc1), and Wd(Equation 2) as described above, the sum of the loads on springs 5a, 5b, 5c, and 5d, i.e., the sum of the loads on the floor surface 4 of cage 3, Wall, is expressed as shown in Equation 19 below. The calculation unit 9d calculates Wall using Equation 17.

[0106]

number

[0107] As described above, the elevator weighing device in Embodiment 4 is an elevator weighing device that calculates the sum of the loads on the first elastic spring 5a, the second elastic spring 5b, the third elastic spring 5c, and the fourth elastic spring 5d that support the floor surface 4 of the elevator car 3 at the four corners under the floor of the elevator car 3, and comprises a differential transformer 2a and detection unit 7d which are first load detectors for detecting the load on spring 5a, a differential transformer 2b and detection unit 7d which are second load detectors for detecting the load on spring 5b, a differential transformer 2c and detection unit 7d which are third load detectors for detecting the load on spring 5c, and The system includes an angle sensor 6da, which is a first angle detector that detects the angle θda between the horizontal plane and the floor surface in a cross section perpendicular to the horizontal plane, passing through the center and the center of spring 5d, and a calculation unit 9d that calculates the sum of the loads Wall on springs 5a, 5b, 5c, and 5d using the load Wa1 detected by the differential transformer 2a and detection unit 7d, the load Wb1 detected by the differential transformer 2b and detection unit 7d, the load Wc1 detected by the differential transformer 2c and detection unit 7d, the angle θda detected by the angle sensor 6da, the distance BB between the center of spring 5a and the center of spring 5d, the spring constant Ka of spring 5a, and the spring constant Kd of spring 5d. This reduces the number of load detectors, including the differential transformer which is a displacement sensor, thus reducing the amount of installation work and allowing for accurate calculation of the load on the floor surface 4 of the cage 3.

[0108] Furthermore, since springs 5a and 5d, which have the same elastic properties, are used, the calculation unit 9d performs the calculation assuming that the spring constant Ka of spring 5a and the spring constant Kd of spring 5d are equal. This simplifies the calculation.

[0109] In Embodiment 4, springs 5a and 5d with identical elastic properties were used, but in reality, there may be some errors, and the spring constants Ka and Kd of springs 5a and 5d are not necessarily exactly equal. To calculate Wall more accurately, the calculation unit 9d can use the respective values ​​of the spring constants Ka and Kd. In this case, Wall is expressed as shown in the following equation 18. Note that equation 18 can also be used if springs 5a and 5d are intentionally used with different elastic properties. In this case, the memory unit 10d only needs to store two types of spring constants, Ka and Kd, and does not need to store the spring constants Kb and Kc.

[0110]

number

[0111] In Embodiment 4, the detection unit 7d calculated the loads Wa, Wb, and Wc on springs 5a, 5b, and 5c using the outputs from differential transformers 2a, 2b, and 2c, respectively. However, it is also possible to provide a detection unit that calculates the load Wa on spring 5a using the output from differential transformer 2a, a detection unit that calculates the load Wb on spring 5b using the output from differential transformer 2b, and a detection unit that calculates the load Wc on spring 5c ​​using the output from differential transformer 2c.

[0112] Furthermore, if an angle sensor 6cd is installed between spring 5d and spring 5c, the load Wd on spring 5d can also be calculated using the load Wc applied to spring 5c ​​located at corner 8c, the angle θcd detected by the angle sensor 6cd installed between spring 5c ​​and spring 5d, the distance AA between the centers of spring 5c ​​and spring 5d, the spring constant Kc of spring 5c, and the spring constant Kd of spring 5d. In this case, if Kc=Kd=K, the sum of the loads Wall can be expressed as shown in equation 19 below.

[0113]

number

[0114] Embodiment 5. The configuration of the elevator weighing device in Embodiment 5 will now be described. Figure 14 is a view of the underside of the elevator car 3 in Embodiment 5, seen from above, and Figure 15 is a front view of the elevator car 3 in Embodiment 5. Figure 15 corresponds to a view of Figure 14 from the bottom to the top of the paper. The elevator weighing device in Embodiment 5 differs from the elevator weighing device in Embodiment 1 in that it is provided with connecting members 11da, 11ab, and 11bc that connect two springs together. Components identical to those in Embodiment 1 are denoted by the same reference numerals and their descriptions are omitted.

[0115] The connecting members 11da, 11ab, and 11bc are formed in a plate shape. They are installed under the floor of the cage 3 along the floor support frame 1 to connect the upper ends of two springs. Specifically, connecting member 11da is attached to the lower surface of the upper end of spring 5a and the lower surface of the upper end of spring 5d, connecting member 11ab is attached to the lower surface of the upper end of spring 5a and the lower surface of the upper end of spring 5b, and connecting member 11bc is attached to the lower surface of the upper end of spring 5b and the lower surface of the upper end of spring 5c. Angle sensors 6da, 6ab, and 6bc are provided on connecting members 11da, 11ab, and 11bc, respectively. Hereafter, connecting members 11da, 11ab, and 11bc may be referred to as the first connecting member, the second connecting member, and the third connecting member, respectively.

[0116] As described above, the elevator weighing device in Embodiment 5 includes a connecting member 11da, which is a first connecting member that connects the upper end of a spring 5a, which is a first elastic member, to a spring 5d, which is a fourth elastic member; a connecting member 11ab, which is a second connecting member that connects the upper end of a spring 5a to a spring 5b, which is a second elastic member; and a connecting member 11bc, which is a third connecting member that connects the upper end of a spring 5b to the upper end of a spring 5c, which is a third elastic member. An angle sensors 6da, 6ab, and 6bc, which are the first, second, and third angle sensors, are provided on the connecting members 11da, 11ab, and 11bc, respectively. As a result, even if the floor surface 4 of the cage 3 deflects, each connecting member 11da, 11ab, and 11bc is less affected by the deflection of the floor surface 4, so that each angle sensor 6da, 6ab, and 6bc provided on each connecting member 11da, 11ab, and 11bc can detect angles θda, θab, and θbc more accurately.

[0117] In Embodiment 5, connecting members 11da are attached to the lower surfaces of the upper ends of spring 5a and spring 5d, connecting members 11ab are attached to the lower surfaces of the upper ends of spring 5a and spring 5b, and connecting members 11bc are attached to the lower surfaces of the upper ends of spring 5b and spring 5c. However, the attachment locations of each connecting member 11da, 11ab, and 11bc are not limited to these. For example, connecting members 11da may be attached to the upper surfaces of the upper ends of spring 5a and spring 5d, connecting members 11ab may be attached to the upper surfaces of the upper ends of spring 5a and spring 5b, and connecting members 11bc may be attached to the upper surfaces of the upper ends of spring 5b and spring 5c. It is more preferable that the floor surface 4 of the cage 3 and each connecting member 11da, 11ab, and 11bc are provided at a distance from each other without contact.

[0118] In Embodiment 5, the elevator weighing device is configured by adding connecting members 11da, 11ab, and 11bc to the elevator weighing device in Embodiment 1. However, in Embodiment 2, connecting members 11da and 11bc may be added, and angle sensors 6da and 6bc may be provided on the connecting members 11da and 11bc, respectively. In Embodiment 3, connecting members 11da and 11ab may be added, and angle sensors 6da and 6ab may be provided on the connecting members 11da and 11ab, respectively. In Embodiment 4, connecting member 11da may be added, and angle sensor 6da may be provided on the connecting member 11da. [Explanation of symbols]

[0119] 1 Floor support frame 2a, 2b, 2c Differential Transformers 3 baskets 4. Basket floor 5a, 5b, 5c, 5d springs 6da, 6ab, 6bc, 6cd angle sensors 7a, 7b, 7c, 7d detection section 8a, 8b, 8c, 8d corners 9a, 9b, 9c, 9d calculation section 10a, 10b, 10c, 10d storage section 11da, 11ab, 11bc connecting members

Claims

1. An elevator weighing device that calculates the sum of the loads applied to a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member that support the floor surface of the elevator car at the four corners beneath the floor of the elevator car, A first load detector for detecting the load applied to the first elastic member, A first angle detector that detects the angle between the horizontal plane and the floor plane in a cross section perpendicular to the horizontal plane, passing through the center of the first elastic member and the center of the fourth elastic member, A second angle detector that detects the angle between the horizontal plane and the floor plane in a cross section perpendicular to the horizontal plane, passing through the center of the first elastic member and the center of the second elastic member, A third angle detector that detects the angle between the horizontal plane and the floor plane in a cross section perpendicular to the horizontal plane, passing through the center of the second elastic member and the center of the third elastic member, A calculation unit that calculates the sum of the loads applied to the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member using the load detected by the first load detector, the angle detected by the first angle detector, the distance between the center of the first elastic member and the center of the fourth elastic member, the angle detected by the second angle detector, the distance between the center of the first elastic member and the center of the second elastic member, the angle detected by the third angle detector, the distance between the center of the second elastic member and the center of the third elastic member, the elastic constant of the first elastic member, the elastic constant of the second elastic member, the elastic constant of the third elastic member, and the elastic constant of the fourth elastic member; An elevator weighing device equipped with [a specific feature / feature].

2. A first connecting member that connects the upper end of the first elastic member and the upper end of the fourth elastic member, A second connecting member that connects the upper end of the first elastic member and the upper end of the second elastic member, The device comprises a third connecting member that connects the upper end of the second elastic member and the upper end of the third elastic member, The first angle detector is provided on the first connecting member, The second angle detector is provided on the second connecting member, The third angle detector is provided on the third connecting member. The elevator weighing device according to claim 1.

3. An elevator weighing device that calculates the sum of the loads applied to a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member that support the floor surface of the elevator car at the four corners beneath the floor of the elevator car, A first load detector for detecting the load applied to the first elastic member, A second load detector for detecting the load applied to the second elastic member, A first angle detector that detects the angle between the horizontal plane and the floor plane in a cross section perpendicular to the horizontal plane, passing through the center of the first elastic member and the center of the fourth elastic member, A second angle detector that detects the angle between the horizontal plane and the floor plane in a cross section perpendicular to the horizontal plane, passing through the center of the second elastic member and the center of the third elastic member, A calculation unit that calculates the sum of the loads applied to the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member using the load detected by the first load detector, the load detected by the second load detector, the angle detected by the first angle detector, the distance between the center of the first elastic member and the center of the fourth elastic member, the angle detected by the second angle detector, the distance between the center of the second elastic member and the center of the third elastic member, the elastic constant of the first elastic member, the elastic constant of the second elastic member, the elastic constant of the third elastic member, and the elastic constant of the fourth elastic member, An elevator weighing device equipped with [a specific feature / feature].

4. A first connecting member that connects the upper end of the first elastic member and the upper end of the fourth elastic member, The device comprises a second connecting member that connects the upper end of the second elastic member and the upper end of the third elastic member, The first angle detector is provided on the first connecting member, The second angle detector is provided on the second connecting member. The elevator weighing device according to claim 3.

5. The calculation unit performs the calculation assuming that the elastic constants of the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member are equal. The elevator weighing device according to any one of claims 1 to 4.

6. An elevator weighing device that calculates the sum of the loads applied to a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member that support the floor surface of the elevator car at the four corners beneath the floor of the elevator car, A first load detector for detecting the load applied to the first elastic member, A second load detector for detecting the load applied to the third elastic member, A first angle detector that detects the angle between the horizontal plane and the floor plane in a cross section perpendicular to the horizontal plane, passing through the center of the first elastic member and the center of the fourth elastic member, A second angle detector that detects the angle between the horizontal plane and the floor plane in a cross section perpendicular to the horizontal plane, passing through the center of the first elastic member and the center of the second elastic member, A calculation unit that calculates the sum of the loads applied to the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member using the load detected by the first load detector, the load detected by the second load detector, the angle detected by the first angle detector, the distance between the center of the first elastic member and the center of the fourth elastic member, the angle detected by the second angle detector, the distance between the center of the first elastic member and the center of the second elastic member, the elastic constant of the first elastic member, the elastic constant of the second elastic member, and the elastic constant of the fourth elastic member, An elevator weighing device equipped with [a specific feature / feature].

7. A first connecting member that connects the upper end of the first elastic member and the upper end of the fourth elastic member, The device comprises a second connecting member that connects the upper end of the first elastic member and the upper end of the second elastic member, The first angle detector is provided on the first connecting member, The second angle detector is provided on the second connecting member. The elevator weighing device according to claim 6.

8. The calculation unit performs the calculation assuming that the elastic constants of the first elastic member, the second elastic member, and the fourth elastic member are equal. The elevator weighing device according to claim 6 or 7.

9. An elevator weighing device that calculates the sum of the loads applied to a first elastic member, a second elastic member, a third elastic member, and a fourth elastic member that support the floor surface of the elevator car at the four corners beneath the floor of the elevator car, A first load detector for detecting the load applied to the first elastic member, A second load detector for detecting the load applied to the second elastic member, A third load detector for detecting the load applied to the third elastic member, A first angle detector that detects the angle between the horizontal plane and the floor plane in a cross section perpendicular to the horizontal plane, passing through the center of the first elastic member and the center of the fourth elastic member, A calculation unit that calculates the sum of the loads applied to the first elastic member, the second elastic member, the third elastic member, and the fourth elastic member using the load detected by the first load detector, the load detected by the second load detector, the load detected by the third load detector, the angle detected by the first angle detector, the distance between the center of the first elastic member and the center of the fourth elastic member, the elastic constant of the first elastic member, and the elastic constant of the fourth elastic member, An elevator weighing device equipped with [a specific feature / feature].

10. The device includes a connecting member that connects the upper end of the first elastic member and the upper end of the fourth elastic member. The first angle detector is provided on the connecting member. The elevator weighing device according to claim 9.

11. The calculation unit performs the calculation assuming that the elastic constant of the first elastic member and the elastic constant of the fourth elastic member are equal. The elevator weighing device according to claim 9 or 10.

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