WO2018105110A1

WO2018105110A1 - Weighing device for elevator

Info

Publication number: WO2018105110A1
Application number: PCT/JP2016/086755
Authority: WO
Inventors: 壮史松本; 郷平山中; 渡辺　誠治; 健宮川; 大樹福井; 馬場　俊行
Original assignee: 三菱電機株式会社
Priority date: 2016-12-09
Filing date: 2016-12-09
Publication date: 2018-06-14
Also published as: JPWO2018105110A1; CN110023225A; CN110023225B; JP6742436B2

Abstract

This weighing device is installed in an elevator that is provided with: a cage; multiple suspension bodies; and multiple support springs that expand and contract in accordance with a load placed in the cage. The weighing device is provided with: a support member; a load detection unit which is supported by the support member; and multiple elastic bodies which are connected to the load detection unit, expand and contract in response to the expansion and contraction of the corresponding support springs, and impart a force to the load detection unit. The respective elastic bodies have a spring constant smaller than that of the support springs.

Description

Elevator scale equipment

The present invention relates to an elevator scale device provided at an end of a suspension body for suspending a car.

In the conventional main rope tension measuring device, the sensor fixing part is fixed to the thimble rod. A cylindrical sensor part is provided between the sensor fixing part and the compression spring. A strain gauge is attached to the outer peripheral surface of the sensor unit. The strain gauge detects strain in the longitudinal direction of the sensor unit. The load applied to the main rope is measured from the strain amount of the sensor unit detected by the strain gauge (see, for example, Patent Document 1).

JP-A-2015-86026

In the conventional main rope tension measuring device as described above, since the sensor portion is configured to receive the rope tension directly, it is necessary to increase the load resistance of the sensor, which increases the cost. Further, when replacing the sensor unit, it is necessary to remove the rope tension, which is troublesome. Furthermore, in order to inspect whether overload is detected, it is necessary to actually load a weight equivalent to overload on the car, which is troublesome.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an elevator scale device that can reduce the load resistance of the sensor and facilitate replacement and inspection of the sensor. And

An elevator scale device according to the present invention includes a car, a plurality of suspension bodies that suspend a car, and a plurality of support springs that are provided at end portions of the suspension body and expand and contract according to a load in the car. A lifting device that is connected to a support member, a load detection unit supported by the support member, and a load detection unit, and expands and contracts according to the expansion and contraction of the corresponding support spring. A plurality of elastic bodies that apply force to the detection unit are provided, and the spring constant of each elastic body is smaller than the spring constant of the support spring.

In the elevator weighing device according to the present invention, a plurality of elastic bodies that expand and contract in accordance with expansion and contraction of the corresponding support springs and are connected to the load detection section are connected to the load detection section, and the spring constant of each elastic body is Since it is smaller than the spring constant of the support spring, it is possible to reduce the load resistance of the sensor and facilitate replacement and inspection of the sensor.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram which shows the 1st example of the elevator with which the scale apparatus by Embodiment 1 of this invention is applied. It is a front view which shows the 1st leash and the scale apparatus of FIG. It is a top view which shows the balance apparatus of FIG. It is a top view which shows the load sensor of FIG. It is a top view which shows the modification of the load sensor of FIG. It is a schematic block diagram which shows the 2nd example of the elevator with which the balance apparatus by Embodiment 1 is applied. It is a schematic block diagram which shows the 3rd example of the elevator with which the balance apparatus by Embodiment 1 is applied. It is a front view which shows the 1st leash and the scale apparatus of FIG. It is a front view which shows the elevator weighing apparatus by Embodiment 2 of this invention. It is a front view which shows the elevator weighing apparatus by Embodiment 3 of this invention. It is a top view which shows the balance apparatus of FIG. It is a top view which expands and shows the load sensor of FIG. It is a front view which shows the elevator weighing apparatus by Embodiment 4 of this invention. FIG. 14 is a front view illustrating an example in which the load sensor of FIG. 13 has two strain gauges. It is a front view which shows the elevator weighing apparatus by Embodiment 5 of this invention. It is a top view which shows the balance apparatus of FIG. It is a front view which shows the principal part of the elevator scale apparatus by Embodiment 6 of this invention. It is a top view which shows the adjustment bolt of FIG. It is a front view which shows the principal part of the elevator scale apparatus by Embodiment 7 of this invention. It is a front view which shows the elevator weighing apparatus by Embodiment 8 of this invention. It is explanatory drawing which shows an example of the layout of a support spring, a load sensor, and a detection spring when the scale apparatus of FIG. 20 is seen from right above. It is a front view which shows the elevator weighing apparatus by Embodiment 9 of this invention. It is a front view which shows the elevator weighing apparatus by Embodiment 10 of this invention. It is a front view which shows the elevator weighing apparatus by Embodiment 11 of this invention.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram showing a first example of an elevator to which a weighing apparatus according to Embodiment 1 of the present invention is applied, and shows a 2: 1 roping type machine room-less elevator. In the figure, a hoisting machine 2 is installed in the upper part of the hoistway 1. The hoisting machine 2 includes a drive sheave 3, a hoisting machine motor (not shown) that rotates the driving sheave 3, and a hoisting machine brake (not shown) that brakes the rotation of the driving sheave 3.

A plurality of suspension bodies 4 (only one is shown in FIG. 1) are wound around the drive sheave 3. As each suspension body 4, a rope or a belt is used. The car 5 and the counterweight 6 are suspended in the hoistway 1 by the suspension body 4. Further, the car 5 and the counterweight 6 move up and down in the hoistway 1 by rotating the drive sheave 3.

In the hoistway 1, a pair of car guide rails (not shown) and a pair of counterweight guide rails (not shown) are installed. The car guide rail guides the raising and lowering of the car 5. The counterweight guide rail guides the lifting and lowering of the counterweight 6.

The car 5 is provided with a car suspension car 7. Although only one car suspension car 7 is shown in FIG. 1, two or more car suspension cars 7 may be provided in the car 5. In addition, the car suspension wheel 7 may be provided in the lower part of the car 5.

The counterweight 6 is provided with a counterweight suspension vehicle 8. Although only one counterweight suspension vehicle 8 is shown in FIG. 1, two or more counterweight suspension vehicles 8 may be provided on the counterweight 6.

At the upper part in the hoistway 1, a first leash 9 and a second leash 10 are provided. The first end of the suspension body 4 is connected to the first rope stop 9. The second end of the suspension body 4 is connected to the second rope stop 10.

A control device 11 for controlling the operation of the car 5 is installed in the hoistway 1. The first leash 9 is provided with a scale device 12 that detects the load in the car 5. The scale device 12 generates a signal corresponding to the mass in the car 5.

The signal generated by the scale device 12 is input to the control device 11. The control device 11 processes the signal from the scale device 12 and measures the mass in the car 5. In addition, the control device 11 processes a signal from the scale device 12 to monitor whether or not the tension of each suspension body 4 is abnormal.

The function of the control device 11 is realized by, for example, a computer having a processor, a memory and an input / output port, or an analog electric circuit.

2 is a front view showing the first leash 9 and the scale device 12 of FIG. 1, and FIG. 3 is a plan view showing the scale device 12 of FIG. 2, in the case where three suspension bodies 4 are used. The configuration is shown. The first leash 9 includes a base 21, a plurality of shackle rods 22, a plurality of spring receivers 23, a plurality of spring seats 24, a plurality of support springs 25, and a plurality of nuts 26.

The base 21 is fixed to the upper part in the hoistway 1. The base 21 is supported by at least one of a car guide rail and a counterweight guide rail, for example.

The first end portion of the corresponding suspension body 4 is connected to the lower end portion (not shown) of the shackle rod 22. Each shackle rod 22 passes through the base 21, the corresponding spring receiver 23, the corresponding spring seat 24, and the corresponding support spring 25.

Each spring receiver 23 is placed on the base 21. Each spring seat 24 is arranged above the corresponding spring receiver 23. Each support spring 25 is sandwiched between a corresponding spring receiver 23 and a corresponding spring seat 24.

Threaded portions are formed at the upper end of each shackle rod 22, and two nuts 26 are screwed in. As a result, the spring seat 24 is prevented from coming off from the shackle rod 22. Each support spring 25 expands and contracts according to a change in tension of the corresponding suspension body 4. That is, the support spring 25 functions as a compression spring and expands and contracts according to the mass in the car 5. As the support spring 25, coil springs having the same size and the same spring constant are used.

A flat support member 32 is fixed on the base 21 via a pair of

support columns

31a and 31b. The support member 32 is disposed above the shackle rod 22 and parallel to the base 21.

The load detection unit 33 is supported on the support member 32. The load detection unit 33 has a plurality of load sensors 34. In this example, the same number of load sensors 34 as the suspension body 4 are used.

Each load sensor 34 is fixed to a fixture 36 with a screw 35. Each fixing bracket 36 is fixed to the lower surface of the support member 32 by a pair of

bolts

37a and 37b.

Each load sensor 34 has a metal sensor plate 38 and a strain gauge 39 provided on the sensor plate 38. The planar shape of each sensor plate 38 is a rectangle.

The first end portion of each sensor plate 38 in the longitudinal direction is fixed to the fixing bracket 36 with a screw 35. That is, the sensor plate 38 is cantilevered by the fixture 36. The second end of each sensor plate 38 is located directly above the corresponding shackle rod 22.

Each strain gauge 39 is disposed on the lower surface of the middle portion of the sensor plate 38, that is, the surface on the shackle rod 22 side. However, each strain gauge 39 may be disposed on the upper surface of the intermediate portion of the sensor plate 38. Each strain gauge 39 changes its electrical resistance value according to the strain of the sensor plate 38.

An eye nut 40 as a rod connecting tool is screwed into the upper end portion of each shackle rod 22. Each eye nut 40 has a nut portion 40a and a ring portion 40b fixed to the nut portion 40a.

The first end of the detection spring 41, which is an elastic body, is connected to the second end of each sensor plate 38. The detection spring 41 and the load sensor 34 are connected by 1: 1. The second end of each detection spring 41 is connected to the corresponding eye nut 40. That is, the second end portion of each detection spring 41 is hooked on the ring portion 40 b of the corresponding eye nut 40.

Each detection spring 41 expands and contracts in accordance with the expansion and contraction of the corresponding support spring 25 and applies a tensile force to the sensor plate 38. That is, the detection spring 41 according to Embodiment 1 functions as a tension spring. As the detection spring 41, coil springs having the same size and the same spring constant are used. The spring constant of the detection spring 41 is smaller than the spring constant of the support spring 25. For this reason, the tension of the suspension 4 is reduced by the detection spring 41 and transmitted to the load detection unit 33.

The scale device 12 according to the first embodiment includes

support columns

31a and 31b, a support member 32, a load detection unit 33, an eyenut 40, and a detection spring 41.

FIG. 4 is a plan view showing the load sensor 34 of FIG. At the first end of the sensor plate 38, a screw insertion hole 38a through which the screw 35 is passed is provided. A spring connection hole 38 b is provided at the second end of the sensor plate 38. The first end of the detection spring 41 is hooked on the spring connection hole 38b.

FIG. 5 is a plan view showing a modification of the load sensor 34 of FIG. In this example, two screw insertion holes 38 a are provided at the first end of the sensor plate 38. For this reason, the sensor plate 38 is fixed to the fixing bracket 36 by the two screws 35. Thereby, the positioning accuracy of the load sensor 34 is improved.

Next, the operation will be described. When the mass in the car 5 fluctuates due to passengers getting on and off, the tension of the suspension 4 also fluctuates. The support spring 25 expands and contracts due to fluctuations in the tension of the suspension body 4. Further, the shackle rod 22 is displaced in the vertical direction by the expansion and contraction of the support spring 25.

Thereby, the detection spring 41 expands and contracts, the tensile force applied to the sensor plate 38 changes, and the strain amount of the sensor plate 38 changes. The control device 11 measures the mass in the car 5 from the total output from the load sensor 34.

In order to measure the mass in the car 5 from the output from the load detection unit 33, for example, when the elevator is installed, two output values from the load detection unit 33 under two different load conditions are obtained in advance. Then, from the two obtained output values, the linear characteristic of the load detection unit 33, that is, the relationship between the output value and the load in the car 5 is set in the control device 11.

Further, the control device 11 monitors the presence or absence of an abnormality in the tension of the individual suspension bodies 4 from the outputs from the individual load sensors 34. That is, when the output value from each load sensor 34 is equal to or less than the threshold value, it is determined that abnormal loosening or breakage has occurred in the corresponding suspension body 4 and is notified to the outside.

In such a scale device 12, the tension of the suspension body 4 is transmitted to the load sensor 34 via the detection spring 41, and the spring constant of the detection spring 41 is smaller than the spring constant of the support spring 25. It is possible to reduce the load resistance of the load sensor 34 used in the above. For this reason, the relatively inexpensive load sensor 34 can be used, and the cost can be reduced.

For example, when a soft detection spring 41 that can be expanded and contracted by hand is used, the load acting on the load sensor 34 can be suppressed to about several kg, the load resistance of the load sensor 34 can be reduced, and the cost can be reduced. Is possible.

Further, when the load sensor 34 is replaced, it is only necessary to remove the detection spring 41 without releasing the tension of the suspension body 4, so that the load sensor 34 can be easily replaced.

Further, by adding a force in the same direction as the tensile force of the detection spring 41 to the load sensor 34, it is possible to inspect whether or not the car 5 is overloaded, so that the load sensor 34 can be easily inspected. Can be. That is, the car load can be increased or decreased in a pseudo manner, and the soundness of the load sensor 34 can be confirmed, such as confirmation of the operation in overload. Further, the load sensor 34 can be calibrated based on the inspection result.

For example, the load corresponding to the overload can be applied to the load sensor 34 by removing the second end of the detection spring 41 from the eye nut 40 and hooking the inspection weight on the second end of the detection spring 41. it can. The load corresponding to the overload can be a load K × Xs obtained by obtaining the displacement Xs of the support spring 25 at the time of overload and multiplying the displacement Xs by the spring constant K of the detection spring 41.

In addition, when adding the load K × Xs to a position different from the detection spring 41 of the sensor plate 38, it is necessary to add correction due to the difference in position to the load K × Xs.

Also, the load sensor 34 can be inspected by giving a displacement Xs to the detection spring 41.

Furthermore, since the load sensor 34 and the detection spring 41 correspond in a 1: 1 ratio, an abnormality in the tension of the individual suspension bodies 4 can be detected. This makes it possible to determine which suspension body 4 is loosened or broken.

Further, since the load sensor 34 having the strain gauge 39 attached to the sensor plate 38 is used, the load detection unit 33 can be configured at low cost.

FIG. 6 is a schematic configuration diagram showing a second example of an elevator to which the scale device 12 according to the first embodiment is applied. In this example, the hoisting machine 2 is arranged in the lower part in the hoistway 1. A first return wheel 13 and a second return wheel 14 are arranged in the upper part of the hoistway 1. The suspension body 4 is wound around the car suspension wheel 7, the first return wheel 13, the drive sheave 3, the second return wheel 14, and the counterweight suspension wheel 8 in order from the first end side. . Other configurations are the same as those of the first example.

Thus, the scale device 12 of the first embodiment can also be applied to a 2: 1 roping elevator in which the hoist 2 is disposed in the lower part of the hoistway 1.

FIG. 7 is a schematic configuration diagram showing a third example of an elevator to which the scale device 12 according to the first embodiment is applied. In this example, the hoisting machine 2 and the control device 11 are installed in a machine room 15 provided in the upper part of the hoistway 1.

The first end of the suspension body 4 is connected to the upper part of the car 5 via the first rope stopper 9. The second end of the suspension body 4 is connected to the upper portion of the counterweight 6 via the second rope stop 10. The scale device 12 is provided on the upper part of the car 5.

FIG. 8 is a front view showing the first leash 9 and the scale device 12 of FIG. In an elevator in which the first end of the suspension 4 is connected to the upper part of the car 5, the configuration of the scale device 12 is upside down as shown in FIG.

Embodiment 2. FIG.
Next, FIG. 9 is a front view showing an elevator weighing apparatus according to Embodiment 2 of the present invention. In the second embodiment, a flat support member 42 is horizontally fixed to the upper end portion of each shackle rod 22. A corresponding shackle rod 22 passes through each support member 42. Each support member 42 is sandwiched between the two nuts 26 and fixed to the shackle rod 22.

Each load sensor 34 is fixed to a corresponding support member 42 with a screw 35. The same number of eyebolts 43 as the load sensors 34 are fixed to the base 21. Each eyebolt 43 is disposed directly below the second end of the corresponding load sensor 34.

The first end of each detection spring 41 is connected to the corresponding load sensor 34. The second end of each detection spring 41 is connected to the corresponding eyebolt 43. In the first embodiment, the detection springs 41 and the corresponding support springs 25 are arranged one above the other. In the second embodiment, each detection spring 41 and the corresponding support springs 25 are arranged in the horizontal direction. Has been.

The scale device of the second embodiment includes a support member 42, an eyebolt 43, a load detection unit 33, and a detection spring 41.

When the shackle rod 22 is displaced in the vertical direction due to a change in the mass in the car 5, the load sensor 34 is also displaced in the vertical direction integrally with the shackle rod 22. As a result, the detection spring 41 expands and contracts, the tensile force applied to the sensor plate 38 changes, and the strain amount of the sensor plate 38 changes. Other configurations and operations are the same as those in the first embodiment.

Even with such a weighing device, the same effect as in the first embodiment can be obtained. In addition, since the detection springs 41 and the corresponding support springs 25 are arranged side by side in the horizontal direction, the total height of the first rope stopper 9 and the weighing device can be kept low. Thereby, the overhead dimension of an elevator can also be shortened.

Note that the weighing apparatus according to the second embodiment can also be applied to an elevator as shown in FIGS.

Embodiment 3 FIG.
Next, FIG. 10 is a front view showing an elevator weighing apparatus according to Embodiment 3 of the present invention, and FIG. 11 is a plan view showing the weighing apparatus of FIG. The same number of rectangular recesses 32 a as the detection springs 41 are provided on the surface of the support member 32 opposite to the detection springs 41. A rectangular through hole 32b is provided in a part of the bottom of the recess 32a, that is, in the center. Each through-hole 32b is disposed immediately above the corresponding detection spring 41.

The load detection unit 33 has the same number of load sensors 44 as the suspension body 4. Each load sensor 44 is accommodated in the corresponding recess 32a. Each load sensor 44 includes a metal sensor plate 45 and a strain gauge 46 provided on the sensor plate 45. A first end of a detection spring 41 is connected to each sensor plate 45 via an eyebolt 43.

FIG. 12 is an enlarged plan view showing the load sensor 44 of FIG. The sensor plate 45 includes an annular stationary portion 45a placed on the bottom of the recess 32a so as to surround the through-hole 32b, an island-shaped movable portion 45b facing the through-hole 32b, and an outer periphery of the movable portion 45b. A connecting portion 45c connecting the portion to the stationary portion 45a.

A screw hole 45d is provided at the center of the movable portion 45b. An eyebolt 43 is screwed into the screw hole 45d. That is, the movable part 45 b receives a tensile force from the detection spring 41. The strain gauge 46 is provided in the connecting portion 45c.

When the detection spring 41 expands and contracts and the tensile force applied to the movable portion 45b changes, the strain amount of the connecting portion 45c changes. Other configurations and operations are the same as those in the first embodiment.

Even with such a weighing device, the same effect as in the first embodiment can be obtained. Further, since the load sensor 44 is merely placed in the recess 32a and is not fastened to the support member 32, the load sensor 44 can be easily assembled and the number of parts can be reduced.

The scale device according to the third embodiment can also be applied to an elevator as shown in FIGS. However, when applied to the elevator shown in FIG. 7, it is necessary to fix the load sensor 44 to the support member 32.
Further, if the support member 42 of the second embodiment is extended to a position directly above the detection spring 41, the load sensor 44 of the third embodiment can be applied to the scale device of the second embodiment.

Embodiment 4 FIG.
Next, FIG. 13 is a front view showing an elevator weighing apparatus according to Embodiment 4 of the present invention. In the fourth embodiment, an S-shaped metal fitting 47 as a rod connector is interposed between each detection spring 41 and the corresponding eye nut 40.

The S-shaped bracket 47 allows the shackle rod 22 to rotate with respect to the detection spring 41. That is, even if the shackle rod 22 rotates about its axis, the rotation is absorbed by the S-shaped metal fitting 47 and is not transmitted to the detection spring 41.

The first end of a U-shaped connection fitting 49 is connected to the second end of each sensor plate 38 by a screw 48. An eye bolt 43 is connected to the second end of each connection fitting 49. A first end of each detection spring 41 is connected to the eyebolt 43. Other configurations and operations are the same as those in the first embodiment.

Even with such a weighing device, the same effect as in the first embodiment can be obtained. Further, since the S-shaped metal fitting 47 is interposed between the eye nut 40 and the detection spring 41, the detection spring 41 is not twisted even when the shackle rod 22 rotates, and the detection accuracy of the load sensor 34 is improved. be able to. Furthermore, it is not necessary to worry about the angles of the eyenut 40 and the detection spring 41 during installation, and the installation can be improved.

Further, since the connection fitting 49 and the eyebolt 43 are interposed between the detection spring 41 and the load sensor 34, the rotation of the shackle rod 22 can be more reliably prevented from being transmitted to the load sensor 34.

The scale device according to the fourth embodiment can be applied to an elevator as shown in FIGS.
Further, an S-shaped metal fitting 47 may be interposed between the sensor plate 38 and the detection spring 41 of the second embodiment.
Furthermore, the load sensor 34 according to the fourth embodiment may be replaced with the load sensor 44 according to the third embodiment.
Furthermore, the rod connector that allows rotation of the shackle rod 22 is not limited to the S-shaped bracket 47, and may be a joint that allows rotation, for example.

In the fourth embodiment, one strain gauge 39 is provided for each load sensor 34. However, as shown in FIG. 14, two strain gauges 39 may be provided. In this case, the strain gauges 39 are arranged on the front and back of the sensor plate 38 at the same position.
In such a configuration, a failure of the strain gauge 39 can be detected by comparing the signals from the two strain gauges 39 by the control device 11. For example, when the difference between the absolute values of the outputs of the two strain gauges 39 is equal to or greater than the threshold value, the control device 11 determines that one of the strain gauges 39 has failed.

In the first to third embodiments, two

strain gauges

39 or 46 may be provided on one

sensor plate

38 or 45.

Embodiment 5 FIG.
15 is a front view showing an elevator weighing apparatus according to Embodiment 5 of the present invention, and FIG. 16 is a plan view showing the weighing apparatus of FIG. A fixing plate 51 is fixed horizontally on the

columns

31a and 31b. The fixed plate 51 is provided with a plurality of through holes 51a through which the detection spring 41 is passed.

On the fixed plate 51, a flat support member 52 is provided. The support member 52 is provided with a plurality of through holes 52a through which the detection spring 41 is passed. The load sensor 34 is attached to the support member 52. Each detection spring 41 is connected to the corresponding load sensor 34 through the through hole 52a.

The support member 52 is screwed with a pair of adjustment bolts 53 as a drive mechanism. The tip of the adjustment bolt 53 is in contact with the fixing plate 51. The support member 52 can be moved up and down by rotating the adjustment bolt 53. In other words, the support member 52 is movable in the extending and contracting direction of the detection spring 41. The adjustment bolt 53 moves the support member 52 to simultaneously expand and contract the plurality of detection springs 41. Other configurations and operations are the same as those in the first embodiment.

Even with such a weighing device, the same effect as in the first embodiment can be obtained. In addition, all the detection springs 41 can be expanded and contracted simultaneously by moving the support member 52 with the adjusting bolt 53. For this reason, even when the detection spring 41 that has a large spring constant and cannot be extended by hand is used, the detection spring 41 can be easily connected between the load sensor 34 and the eyenut 40. Further, a load corresponding to overload can be applied to all the load sensors 34 in a pseudo and simultaneous manner, and the load sensors 34 can be easily inspected.

Note that the weighing apparatus according to the fifth embodiment can also be applied to an elevator as shown in FIGS.
Further, the support member 52 and the drive mechanism of the fifth embodiment may be applied to the third and fourth embodiments.

Embodiment 6 FIG.
Next, FIG. 17 is a front view showing an essential part of an elevator scale device according to Embodiment 6 of the present invention. In the sixth embodiment, the same number of inspection bolts 54 as the load sensor 34 (only one is shown in FIG. 17) is screwed into the support member 32 as a load adding mechanism. Further, the lower end portion of each connection fitting 49 is extended to a position directly below the corresponding inspection bolt 54.

The inspection bolt 54 is separated from the connection fitting 49 in normal times. Further, the inspection bolt 54 can be screwed in the same direction as the tensile force by the detection spring 41. When the load sensor 34 is inspected, a load in the same direction as the tensile force of the detection spring 41 is applied to the load sensor 34 by screwing the inspection bolt 54 and pushing the connection fitting 49. Other configurations and operations are the same as those in the fourth embodiment.

Even with such a weighing apparatus, the same effect as in the fourth embodiment can be obtained. Further, the inspection can be easily performed for each load sensor 34 with a simple configuration.

Further, for example, as shown in FIG. 18, if a mark is attached to the head of the support member 32 and the inspection bolt 54 so that the normal rotation position of the inspection bolt 54 and the rotation position at the time of inspection can be understood, the load sensor 34 inspections can be performed more easily.

Further, for example, if the rotation position of the inspection bolt 54 where the tip of the inspection bolt 54 contacts the connection fitting 49 and the output of the load sensor 34 are recorded in the no-load state and the full-load state at the time of installation, the load sensor 34 is recorded. Inspection and calibration can be performed more easily.

Embodiment 7 FIG.
Next, FIG. 19 is a front view showing an essential part of an elevator scale device according to Embodiment 7 of the present invention. In the seventh embodiment, the connection fitting 49 is provided with a weight connection portion 55. An eye bolt similar to the eye bolt 43 can be used as the weight connection portion 55. Further, in the seventh embodiment, instead of the inspection bolt 54 of the sixth embodiment, an inspection weight 56 as a load adding mechanism is connected to the weight connection portion 55. Other configurations and operations are the same as those in the fourth embodiment.

Note that the inspection weight 56 may be connected using the eyebolt 43 of the third embodiment as a weight connection portion.

Embodiment 8 FIG.
Next, FIG. 20 is a front view showing an elevator weighing apparatus according to Embodiment 8 of the present invention, and FIG. 21 is a support spring 25, a load sensor 34, and a detection spring when the weighing apparatus of FIG. 20 is viewed from directly above. It is explanatory drawing which shows an example of the layout of 41. FIG.

In the first to seventh embodiments, the detection spring 41 and the load sensor 34 correspond 1: 1, but in the eighth embodiment, a plurality of detection springs 41 are connected to each load sensor 34. Specifically, the load detection unit 33 has two load sensors 34. Two load springs 41 are connected to one load sensor 34. In addition, three detection springs 41 are connected to the other load sensor 34. Other configurations and operations are the same as those in the fourth embodiment.

In such a weighing apparatus, the number of load sensors 34 can be reduced to reduce the cost. Moreover, although the tension | tensile_strength of each suspension body 4 cannot be detected, the fracture | rupture of the suspension body 4 with a large tension | tensile_strength change can be detected.

The scale device according to the eighth embodiment can also be applied to an elevator as shown in FIGS.
Further, in the weighing devices of the first to third embodiments and the fifth to seventh embodiments, the number of load sensors 34 may be reduced as in the eighth embodiment.
Furthermore, the number of load sensors 34 may be one or three or more.

Embodiment 9 FIG.
Next, FIG. 22 is a front view showing an elevator weighing apparatus according to Embodiment 9 of the present invention. In the ninth embodiment, each detection spring 41 is connected to a corresponding support spring 25 via a U-shaped support spring connector 57 and an eyebolt 43. The support spring connector 57 is sandwiched between the spring seat 24 and the nut 26 and connected to the movable side end of the support spring 25.

Each support spring connector 57 includes a first horizontal portion 57a, a second horizontal portion 57b facing the first horizontal portion 57a above the first horizontal portion 57a, and a first horizontal portion 57a. And a vertical portion 57c that connects the second horizontal portion 57b. The first horizontal portion 57 a is interposed between the spring seat 24 and the nut 26.

The eyebolt 43 is fixed by being screwed into the second horizontal portion 57b. A second end of the detection spring 41 is hung on the eyebolt 43. As a result, the detection spring 41 expands and contracts according to the expansion and contraction of the support spring 25 without using the shackle rod 22. Other configurations and operations are the same as those in the first embodiment.

In such a scale device, the expansion and contraction of the support spring 25 and the expansion and contraction of the detection spring 41 directly correspond to each other regardless of the vertical position of the shackle rod 22 with respect to the support spring 25. For this reason, it is possible to measure the absolute value of the tension of the suspension body 4 by performing zero point correction before the suspension body 4 is installed or by setting the positional relationship immediately before the force is applied to the detection spring 41. It becomes.

Embodiment 10 FIG.
Next, FIG. 23 is a front view showing an elevator weighing apparatus according to Embodiment 10 of the present invention. In the tenth embodiment, the length of the second horizontal portion 57b is shorter than the length of the first horizontal portion 57a. That is, the protruding amount of the second horizontal portion 57b from the vertical portion 57c is smaller than the protruding amount of the first horizontal portion 57a from the vertical portion 57c. As a result, the second horizontal portion 57b does not overlap the shackle rod 22 when viewed from directly above.

Further, the eyebolt 43 is disposed at a position shifted from directly above the shackle rod 22. Thereby, the connection position of each detection spring 41 with respect to the support spring connector 57 is a position deviated from directly above the corresponding shackle rod 22. On the other hand, the first end of the detection spring 41 is connected to the sensor plate 38 directly above the shackle rod 22. For this reason, each detection spring 41 is inclined and arranged.

In the ninth embodiment, the vertical dimension of the support spring connector 57 is sufficiently secured in order to secure a space for adjusting the vertical position of the shackle rod 22. On the other hand, in the tenth embodiment, even if the vertical position of the shackle rod 22 is adjusted, it does not interfere with the support spring connector 57, so that the vertical dimension of the support spring connector 57 can be reduced. Thereby, the height dimension of the scale device can be suppressed.

Also, even if the shackle rod 22 rotates about its axis, the length of the detection spring 41 does not change, and an error due to the rotation of the shackle rod 22 does not occur.

Note that the weighing devices according to the ninth and tenth embodiments can also be applied to an elevator as shown in FIGS.
Further, the support spring connector 57 of the ninth or tenth embodiment may be applied to the scale devices of the second, third, fifth, and seventh embodiments.

Embodiment 11 FIG.
Next, FIG. 24 is a front view showing an elevator weighing apparatus according to Embodiment 11 of the present invention. In the first to tenth embodiments, a tension spring is used as the detection spring 41. However, in the eleventh embodiment, the detection spring 61, which is an elastic body, functions as a compression spring. As the detection spring 61, coil springs having the same size and the same spring constant are used. The spring constant of the detection spring 61 is smaller than the spring constant of the support spring 25.

Each detection spring 61 is sandwiched between the upper connector 62 and the lower connector 63 in a pre-compressed state. Each upper connector 62 is connected to the second end of the corresponding sensor plate 38. The threaded portion of the corresponding shackle rod 22 is screwed into each lower connector 63.

When the load acting on the suspension body 4 increases, the support spring 25 is compressed. At this time, the compression amount of the detection spring 61 decreases. That is, the detection spring 61 extends. Conversely, when the load acting on the suspension body 4 is reduced, the compression amount of the support spring 25 is reduced and the compression amount of the detection spring 61 is increased. Other configurations and operations are the same as those in the first embodiment.

Thus, even if a compression spring is used as the detection spring 61, the same effect as in the first embodiment can be obtained.

The weighing apparatus according to the eleventh embodiment can also be applied to an elevator as shown in FIGS.
Also in the configurations of Embodiments 2 to 10, the tension spring can be replaced with a compression spring. However, in the case of using a compression spring, if the configuration in which both ends of the detection spring are simply hooked may be removed during expansion / contraction, it is necessary to have a configuration that does not come out during expansion / contraction.

Further, the load sensor is not limited to a sensor using a strain gauge, and may be a sensor using a piezoelectric element, for example.
Furthermore, the detection spring is not limited to a coil spring, and may be a leaf spring, for example.
The elastic body is not limited to a spring, and may be rubber, for example.
Furthermore, the control device that measures the mass in the car using a signal from the scale device may be separated from the control device 11 that controls the operation of the car. The control device may be a safety monitoring device, for example.
Furthermore, the elevator to which the weighing apparatus of the present invention is applied is not limited to the elevator shown in FIGS. 1, 6, and 7. For example, the present invention includes an elevator having a machine room, a double deck elevator, It can also be applied to shaft double car type elevators. The one-shaft double-car type elevator is an elevator in which an upper car and a lower car arranged directly below the upper car are lifted and lowered independently in a common hoistway.

4 Suspension body, 5 cage, 12 scale device, 22 shackle rod, 25 support spring, 32, 42, 52 support member, 33 load detection part, 32a recess, 32b through hole, 34, 44 load sensor, 38, 45

sensor plate

39,46 strain gauge, 40 eyenut (rod connector), 41, 61 detection spring (elastic body), 45a stationary part, 45b movable part, 45c connecting part, 47 S-shaped bracket (rod connector), 53 adjustment bolt (Drive mechanism), 54 inspection bolt (load addition mechanism), 55 weight connection, 56 inspection weight (load addition mechanism), 57 support spring connector.

Claims

A car, a plurality of suspension bodies for suspending the car, and a plurality of support springs provided at end portions of the suspension body and extending and contracting according to a load in the car; A weighing device,
Support member,
A load detector supported by the support member;
A plurality of elastic bodies connected to the load detection unit, extending and contracting according to expansion and contraction of the corresponding support spring, and applying force to the load detection unit;
An elevator scale device in which a spring constant of each elastic body is smaller than a spring constant of the support spring.
The load detection unit has a plurality of load sensors,
The elevator scale device according to claim 1, wherein the elastic body and the load sensor are connected at a ratio of 1: 1.
The elevator scale device according to claim 1, wherein the load detection unit includes a load sensor to which a plurality of the elastic bodies are connected.
The elevator scale device according to claim 2 or 3, wherein the load sensor includes a sensor plate to which the elastic body is connected, and a strain gauge provided on the sensor plate.
A concave portion is provided on a surface of the support member opposite to the elastic body,
A through hole is provided in a part of the bottom of the recess,
The sensor plate is
A stationary part placed on the bottom of the through hole;
A movable part that faces the through hole and receives a force from the elastic body;
A connecting portion connecting the movable portion to the stationary portion,
The elevator strain device according to claim 4, wherein the strain gauge is provided in the connecting portion.
A plurality of rod connectors connected respectively to a plurality of shackle rods to which the plurality of suspensions are connected;
The elevator scale device according to any one of claims 1 to 5, wherein each elastic body is connected to the corresponding rod connector.
The elevator scale device according to claim 6, wherein each rod connector has an eyenut into which the shackle rod is screwed.
The elevator scale device according to claim 6 or 7, wherein each rod connector allows rotation of the shackle rod with respect to the elastic body.
A plurality of support spring connectors connected to the movable side end of each of the support springs;
The elevator scale device according to any one of claims 1 to 5, wherein each of the elastic bodies is connected to the corresponding support spring connector.
The connection position of each of the elastic bodies to the support spring connector is a position deviated from directly above the corresponding shackle rod to which the corresponding suspension body is connected,
The elevator scale device according to claim 9, wherein each of the elastic bodies is inclined.
The support member is movable in the expansion / contraction direction of the elastic body,
The elevator scale device according to any one of claims 1 to 10, wherein the support member is provided with a drive mechanism that moves the support member and simultaneously expands and contracts the plurality of elastic bodies.
The load adding mechanism for adding a load in the same direction as the force by the elastic body to the load detecting unit when the load detecting unit is inspected. Elevator scale device.
13. The elevator scale device according to claim 12, wherein the load applying mechanism is an inspection bolt that can be screwed in the same direction as the force by the elastic body.
The load application mechanism is an inspection weight,
The elevator scale device according to claim 12, wherein the load detection unit is provided with a weight connection unit for connecting the inspection weight.