JP6742436B2 - Elevator scale equipment - Google Patents

Description

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

In the conventional main rope tension measuring device, the sensor fixing portion is fixed to the thimble rod. A cylindrical sensor unit is provided between the sensor fixing unit 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 amount of strain of the sensor unit detected by the strain gauge (see, for example, Patent Document 1).

JP, 2005-86026, A

In the conventional main rope tension measuring device as described above, since the sensor portion is configured to directly receive the rope tension, it is necessary to increase the withstand load of the sensor, which increases the cost. Further, when replacing the sensor unit, it is necessary to release the rope tension, which is troublesome. Further, in order to perform an inspection as to whether or not to detect the overload, it is necessary to actually load a weight equivalent to the overload on the car, which is troublesome.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain an elevator weighing device that can reduce the withstand load of the sensor and facilitate the replacement and inspection of the sensor. And

An elevator weighing apparatus according to the present invention includes a car, a plurality of suspension bodies for suspending a 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 scale device provided in an elevator, which 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 a corresponding support spring to load the load. A plurality of elastic bodies that give 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.

The elevator weighing apparatus of the present invention expands and contracts in accordance with the expansion and contraction of the corresponding support spring, and a plurality of elastic bodies that give a force to the load detection unit are connected to the load detection unit, and the spring constant of each elastic body is Since the spring constant is smaller than the spring constant of the support spring, it is possible to reduce the withstand load of the sensor and facilitate replacement and inspection of the sensor.

It is a schematic block diagram which shows the 1st example of the elevator to which the weighing|measuring equipment by Embodiment 1 of this invention is applied. It is a front view which shows the 1st rope stop and 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 to which the weighing|measuring equipment by Embodiment 1 is applied. It is a schematic block diagram which shows the 3rd example of the elevator to which the weighing|measuring equipment by Embodiment 1 is applied. It is a front view which shows the 1st rope stop and scale apparatus of FIG. It is a front view which shows the weighing apparatus of the elevator by Embodiment 2 of this invention. It is a front view which shows the weighing apparatus of the elevator 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 weighing apparatus of the elevator by Embodiment 4 of this invention. FIG. 14 is a front view showing an example in which the load sensor of FIG. 13 has two strain gauges. It is a front view which shows the weighing apparatus of the elevator 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 weighing 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 weighing apparatus by Embodiment 7 of this invention. It is a front view which shows the weighing apparatus of the elevator by Embodiment 8 of this invention. It is explanatory drawing which shows an example of a layout of a support spring, a load sensor, and a detection spring when the balance apparatus of FIG. 20 is seen from directly above. It is a front view which shows the weighing apparatus of the elevator by Embodiment 9 of this invention. It is a front view which shows the weighing apparatus of the elevator by Embodiment 10 of this invention. It is a front view which shows the weighing apparatus of the elevator 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. 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 above the hoistway 1. The hoisting machine 2 has a drive sheave 3, a hoisting machine motor (not shown) for rotating the drive sheave 3, and a hoisting machine brake (not shown) for braking the rotation of the drive sheave 3.

A plurality of (only one in FIG. 1) suspensions 4 are wound around the drive sheave 3. A rope or a belt is used as each suspension body 4. The car 5 and the counterweight 6 are suspended in the hoistway 1 by the suspension 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. Further, the car suspension car 7 may be provided below 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.

A first rope stop 9 and a second rope stop 10 are provided in the upper part of the hoistway 1. The first end of the suspension 4 is connected to the first rope stop 9. The second end of the suspension 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 rope stopper 9 is provided with a weighing device 12 that detects the load inside the car 5. The weighing device 12 generates a signal according to the mass inside the car 5.

The signal generated by the weighing device 12 is input to the control device 11. The control device 11 processes the signal from the weighing device 12 to measure the mass in the car 5. Further, the control device 11 processes a signal from the weighing 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 processor, a computer having a memory and an input/output port, or an analog electric circuit.

2 is a front view showing the first rope stopper 9 and the weighing device 12 in FIG. 1, and FIG. 3 is a plan view showing the weighing device 12 in FIG. 2, in the case where three suspensions 4 are used. The configuration is shown. The first rope stop 9 has a base 21, a plurality of shackle rods 22, a plurality of spring bearings 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 of the hoistway 1. The base 21 is supported by at least one of the car guide rail and the counterweight guide rail, for example.

The corresponding first end of the suspension 4 is connected to the lower end (not shown) of the shackle rod 22. Further, each shackle rod 22 penetrates 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 seat 23. Each support spring 25 is sandwiched between a corresponding spring receiver 23 and a corresponding spring seat 24.

A threaded portion is formed on the upper end portion of each shackle rod 22, and two nuts 26 are screwed therein. This prevents the spring seat 24 from coming off the shackle rod 22. Each support spring 25 expands and contracts according to the change in tension of the corresponding suspension 4. That is, the support spring 25 functions as a compression spring and expands and contracts according to the mass inside the car 5. As the support spring 25, coil springs having the same size and the same spring constant are used.

A flat plate-shaped support member 32 is fixed on the base 21 via a pair of columns 31a and 31b. The support member 32 is arranged above the shackle rod 22 and in parallel with the base 21.

The load detector 33 is supported by 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 bodies 4 are used.

Each load sensor 34 is fixed to a fixing fitting 36 with a screw 35. Each fixing member 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 sensor plate 38 made of metal and a strain gauge 39 provided on the sensor plate 38. The planar shape of each sensor plate 38 is a rectangle.

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

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

An eye nut 40 as a rod connecting tool is screwed into the upper end 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 at a ratio of 1:1. The second end of each detection spring 41 is connected to the corresponding eye nut 40. That is, the second end of each detection spring 41 is hooked on the ring portion 40b of the corresponding eye nut 40.

Each detection spring 41 expands and contracts according to 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 of the first embodiment 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. Therefore, the tension of the suspension 4 is reduced by the detection spring 41 and transmitted to the load detection unit 33.

The weighing device 12 according to the first embodiment includes the columns 31a and 31b, the support member 32, the load detection unit 33, the eye nut 40, and the detection spring 41.

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

FIG. 5 is a plan view showing a modified example of the load sensor 34 of FIG. In this example, two screw insertion holes 38a are provided at the first end of the sensor plate 38. Therefore, the sensor plate 38 is fixed to the fixing fitting 36 by the two screws 35. This improves the positioning accuracy of the load sensor 34.

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

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. 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, two output values from the load detection unit 33 under two different load conditions are obtained in advance when the elevator is installed, for example. Then, 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 from the obtained two output values.

Further, the control device 11 monitors whether or not there is an abnormality in the tension of each suspension body 4 from the output from each load sensor 34. That is, when the output value from each load sensor 34 becomes equal to or less than the threshold value, it is determined that the corresponding suspension body 4 is abnormally loosened or broken, and the outside is notified.

In such a scale device 12, since the tension of the suspension 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, the load detection unit 33. The withstand load of the load sensor 34 used for can be reduced. Therefore, the relatively inexpensive load sensor 34 can be used, and the cost can be reduced.

For example, if the softness 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 withstand load of the load sensor 34 can be reduced, and the cost can be reduced. It is possible.

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

Furthermore, by applying 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 overload of the car 5 is detected, so that the load sensor 34 can be easily inspected. Can be That is, the car load can be artificially increased or decreased, and the soundness of the load sensor 34 can be confirmed, such as confirmation of operation in overload. Further, the load sensor 34 can be calibrated based on the inspection result.

For example, 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 is possible to apply a load corresponding to the overload to the load sensor 34. it can. The load equivalent 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.

When the load K×Xs is added to the position different from the detection spring 41 of the sensor plate 38, it is necessary to add the correction due to the difference in the position to the load K×Xs.

The load sensor 34 can also be inspected by applying the displacement Xs to the detection spring 41.

Furthermore, since the load sensor 34 and the detection spring 41 correspond to each other 1:1, it is possible to detect an abnormality in the tension of each suspension body 4. This makes it possible to determine which suspension 4 is loosened or broken.

Moreover, since the load sensor 34 in which the strain gauge 39 is 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 weighing device 12 according to the first embodiment is applied. In this example, the hoisting machine 2 is arranged in the lower part of 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 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 in the first example.

As described above, the weighing device 12 according to the first embodiment can be applied to a 2:1 roping type elevator in which the hoisting machine 2 is disposed in the lower portion of the hoistway 1.

FIG. 7 is a schematic configuration diagram showing a third example of an elevator to which the weighing 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 above the hoistway 1.

The first end of the suspension 4 is connected to the top of the car 5 via a first rope stop 9. The second end of the suspension 4 is connected to the upper part of the counterweight 6 via a second rope stop 10. The weighing device 12 is provided above the car 5.

FIG. 8 is a front view showing the first rope stopper 9 and the weighing device 12 of FIG. 7. In an elevator in which the first end of the suspension 4 is connected to the top of the car 5, the configuration of the weighing device 12 is upside down from that of FIG. 2, as shown in FIG.

Embodiment 2.
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 plate-shaped support member 42 is horizontally fixed to the upper end of each shackle rod 22. A corresponding shackle rod 22 passes through each support member 42. Further, each support member 42 is sandwiched between two nuts 26 and fixed to the shackle rod 22.

Each load sensor 34 is fixed to the 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 arranged 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 side by side in the vertical direction, but in the second embodiment, the detection springs 41 and the corresponding support springs 25 are arranged side by side in the lateral direction. Has been done.

The weighing apparatus according to the second embodiment includes a support member 42, eyebolts 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 of the car 5, the load sensor 34 is also displaced in the vertical direction together 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 similar to those of the first embodiment.

Even with such a scale device, the same effect as that of the first embodiment can be obtained. Further, since the detection springs 41 and the corresponding support springs 25 are arranged side by side in the lateral direction, the total height of the first rope stopper 9 and the weighing device can be kept low. This can also reduce the overhead dimensions of the elevator.

The weighing device according to the second embodiment can also be applied to the elevator shown in FIGS. 1, 6, and 7, for example.

Embodiment 3.
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. On the surface of the support member 32 opposite to the detection spring 41, the same number of rectangular recesses 32a as the detection springs 41 are provided. 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 arranged directly above the corresponding detection spring 41.

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

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. And 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. The eyebolt 43 is screwed into the screw hole 45d. That is, the movable portion 45b receives the 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 similar to those of the first embodiment.

Even with such a scale device, the same effect as that of the first embodiment can be obtained. Further, since the load sensor 44 is only 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 weighing device according to the third embodiment can also be applied to the elevator shown in FIGS. 1, 6, and 7, for example. 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 just above the detection spring 41, the load sensor 44 of the third embodiment can be applied to the weighing device of the second embodiment.

Fourth Embodiment
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 connecting tool is interposed between each detection spring 41 and the corresponding eye nut 40.

The S-shaped metal fitting 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 connecting fitting 49 is connected to the second end of each sensor plate 38 with a screw 48. An eyebolt 43 is connected to the second end of each connection fitting 49. The first end of each detection spring 41 is connected to the eyebolt 43. Other configurations and operations are similar to those of the first embodiment.

Even with such a scale device, the same effect as that of 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, even if the shackle rod 22 rotates, the detection spring 41 is not twisted and the detection accuracy of the load sensor 34 is improved. be able to. Furthermore, it is not necessary to pay attention to the angles of the eye nut 40 and the detection spring 41 at the time of installation, and the installability can be improved.

Moreover, since the connection fitting 49 and the eyebolt 43 are interposed between the detection spring 41 and the load sensor 34, it is possible to more reliably prevent the rotation of the shackle rod 22 from being transmitted to the load sensor 34.

The weighing device according to the fourth embodiment can also be applied to the 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 of the fourth embodiment may be replaced with the load sensor 44 of the third embodiment.
Furthermore, the rod connector that allows rotation of the shackle rod 22 is not limited to the S-shaped metal fitting 47, and may be, for example, a joint that allows rotation.

Further, in the fourth embodiment, one strain gauge 39 is provided for each load sensor 34, but two strain gauges 39 may be provided as shown in FIG. 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 with the control device 11. For example, when the difference between the absolute values of the outputs of the two strain gauges 39 becomes equal to or larger than the threshold value, the control device 11 determines that one of the strain gauges 39 is out of order.

In addition, also in Embodiments 1 to 3, one sensor plate 38 or 45 may be provided with two strain gauges 39 or 46.

Embodiment 5.
Next, 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 horizontally fixed on the columns 31a and 31b. The fixed plate 51 is provided with a plurality of through holes 51a through which the detection springs 41 pass.

A flat plate-shaped support member 52 is provided on the fixed plate 51. The support member 52 is provided with a plurality of through holes 52a through which the detection spring 41 passes. 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.

A pair of adjustment bolts 53 as a drive mechanism are screwed into the support member 52. The tip of the adjusting bolt 53 is in contact with the fixed plate 51. The support member 52 can be moved up and down by rotating the adjustment bolt 53. That is, the support member 52 is movable in the expansion/contraction 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 similar to those of the first embodiment.

Even with such a scale device, the same effect as that of the first embodiment can be obtained. Moreover, the support member 52 can be moved by the adjusting bolt 53 to expand and contract all the detection springs 41 at the same time. Therefore, even when the detection spring 41 having a large spring constant and which cannot be extended by hand is used, the detection spring 41 can be easily connected between the load sensor 34 and the eye nut 40. Further, loads corresponding to overloads can be applied to all the load sensors 34 in a pseudo manner and at the same time, so that the load sensors 34 can be easily inspected.

The weighing apparatus according to the fifth embodiment can also be applied to the elevator shown in FIGS. 1, 6, and 7, for example.
Further, the support member 52 and the drive mechanism of the fifth embodiment may be applied to the third and fourth embodiments.

Sixth Embodiment
Next, FIG. 17 is a front view showing a main part of an elevator weighing apparatus according to Embodiment 6 of the present invention. In the sixth embodiment, as the load applying mechanism, the same number of inspection bolts 54 as the load sensor 34 (only one is shown in FIG. 17) are screwed into the support member 32. Further, the lower end portion of each connection fitting 49 extends to just below the corresponding inspection bolt 54.

The inspection bolt 54 is normally separated from the connection fitting 49. Further, the inspection bolt 54 can be screwed in the same direction as the tensile force of the detection spring 41. When inspecting the load sensor 34, the inspection bolt 54 is screwed in and the connection fitting 49 is pushed, whereby a load in the same direction as the tensile force of the detection spring 41 is applied to the load sensor 34. Other configurations and operations are similar to those of the fourth embodiment.

Even with such a scale device, the same effect as that of the fourth embodiment can be obtained. Moreover, the inspection can be easily performed for each load sensor 34 with a simple configuration.

For example, as shown in FIG. 18, if the heads of the support member 32 and the inspection bolt 54 are marked so that the rotational position of the inspection bolt 54 in the normal state and the rotational position of the inspection bolt 54 can be known, the load sensor The inspection of 34 can be performed more easily.

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

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

Even with such a scale device, the same effect as that of the fourth embodiment can be obtained. Moreover, the inspection can be easily performed for each load sensor 34 with a simple configuration.

The eyebolt 43 of the third embodiment may be used as a weight connecting portion to connect the inspection weight 56.

Eighth embodiment.
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.

In the first to seventh embodiments, the detection spring 41 and the load sensor 34 correspond to each other in a ratio of 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. Then, the two detection springs 41 are connected to the one load sensor 34. Further, three detection springs 41 are connected to the other load sensor 34. Other configurations and operations are similar to those of the fourth embodiment.

In such a scale device, the number of load sensors 34 can be reduced, and the cost can be reduced. Further, although the tension of each suspension body 4 cannot be detected, the breakage of the suspension body 4 having a large change in tension can be detected.

The weighing device according to the eighth embodiment can also be applied to the elevator shown in FIGS. 1, 6, and 7, for example.
Further, in the weighing devices of the first to third and fifth to seventh embodiments, the number of the load sensors 34 may be reduced as in the eighth embodiment.
Further, the number of load sensors 34 may be one or three or more.

Ninth Embodiment
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 the corresponding support spring 25 via the U-shaped support spring connector 57 and the eyebolt 43. The support spring connector 57 is sandwiched between the spring seat 24 and the nut 26 and connected to the movable end of the support spring 25.

In addition, each support spring connector 57 includes a first horizontal portion 57a, a second horizontal portion 57b that faces the first horizontal portion 57a above the first horizontal portion 57a, and a first horizontal portion 57a. And a vertical portion 57c connecting the second horizontal portion 57b. The first horizontal portion 57a is interposed between the spring seat 24 and the nut 26.

The eyebolt 43 is screwed and fixed to the second horizontal portion 57b. The second end of the detection spring 41 is hooked 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 the shackle rod 22. Other configurations and operations are similar to those of the first embodiment.

In such a weighing 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. Therefore, the absolute value of the tension of the suspension 4 can be measured by performing the zero point correction before installing the suspension 4 or by setting the positional relationship immediately before the force is applied to the detection spring 41. Becomes

Embodiment 10.
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 amount of protrusion of the second horizontal portion 57b from the vertical portion 57c is smaller than the amount of protrusion 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 arranged at a position displaced from directly above the shackle rod 22. As a result, the connection position of each detection spring 41 with respect to the support spring connection tool 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 just above the shackle rod 22. Therefore, the detection springs 41 are arranged so as to be inclined.

In the ninth embodiment, in order to secure a space for adjusting the vertical position of the shackle rod 22, the vertical dimension of the support spring connector 57 is sufficiently secured. 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 weighing device can be suppressed.

Further, 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.

The weighing devices of the ninth and tenth embodiments can also be applied to the elevators shown in FIGS. 1, 6, and 7, for example.
Further, the support spring connector 57 of the ninth or tenth embodiment may be applied to the weighing devices of the second, third, or fifth to seventh embodiments.

Eleventh Embodiment
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, but 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 an upper connecting tool 62 and a lower connecting tool 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 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. On the contrary, when the load acting on the suspension body 4 becomes smaller, the compression amount of the support spring 25 becomes smaller and the compression amount of the detection spring 61 increases. Other configurations and operations are similar to those of the first embodiment.

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

The weighing device according to the eleventh embodiment can also be applied to the elevator as shown in FIGS.
Further, also in the configurations of Embodiments 2 to 10, it is possible to replace the tension spring with a compression spring. However, when a compression spring is used, if the both ends of the detection spring are simply hooked, they may come off during expansion and contraction.

Furthermore, 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 the coil spring, and may be a leaf spring, for example.
The elastic body is not limited to the spring and may be rubber, for example.
Further, the control device that measures the mass in the car using the signal from the weighing device may be separated from the control device 11 that controls the operation of the car. Further, the control device may be, for example, a safety monitoring device.
Furthermore, the elevator to which the weighing apparatus of the present invention is applied is not limited to the elevators shown in FIGS. 1, 6 and 7, and the present invention is applicable to, for example, an elevator having a machine room, a double deck elevator, and a one-way 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 independently move up and down in a common hoistway.

4 suspension body, 5 car, 12 scale device, 22 shackle rod, 25 support spring, 32, 42, 52 support member, 33 load detection part, 32a recessed part, 32b through hole, 34, 44 load sensor, 38, 45 sensor plate , 39, 46 Strain gauge, 40 Eye nut (rod connector), 41, 61 Detection spring (elastic body), 45a Stationary part, 45b Movable part, 45c Connecting part, 47 S-shaped metal fitting (rod connector), 53 Adjustment bolt (Driving mechanism), 54 inspection bolt (load applying mechanism), 55 weight connecting portion, 56 inspection weight (load applying mechanism), 57 support spring connecting tool.

Claims (15)

A car, a plurality of suspension bodies that suspend the car, and a plurality of support springs that are respectively provided at the ends of the suspension body and that expand and contract according to the load in the car. A scale device that
Support member,
A load detection unit supported by the support member, and a plurality of elastic bodies connected to the load detection unit, which expand and contract according to the expansion and contraction of the corresponding support spring, and apply a force to the load detection unit. ,
The spring constant of each elastic body is smaller than the spring constant of the support spring,
The elevator weighing device, wherein each of the elastic bodies is a detection spring functioning as a tension spring. Further comprising a plurality of shackle rods to which the plurality of suspension bodies are connected,
Each of the shackle rods passes through the corresponding support spring,
The plurality of shackle rods do not penetrate the plurality of elastic bodies,
The elevator weighing apparatus according to claim 1, wherein each of the elastic bodies is removable without removing tension of the suspension body. The load detection unit has a plurality of load sensors,
The elevator weighing apparatus according to claim 1, wherein the elastic body and the load sensor are connected at a ratio of 1:1. The elevator weighing apparatus according to claim 1, wherein the load detection unit includes a load sensor to which the plurality of elastic bodies are connected. The elevator load balancer according to claim 3 or 4, 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 car, a plurality of suspensions for suspending the car, and an elevator provided with a plurality of support springs that are respectively provided at the ends of the suspensions and that expand and contract according to the load in the car. A scale device that
Support member,
A load detection unit supported by the support member; and a plurality of elastic bodies connected to the load detection unit, which expand and contract according to the expansion and contraction of the corresponding support springs, and apply a force to the load detection unit. ,
The spring constant of each elastic body is smaller than the spring constant of the support spring,
The load detection unit has a load sensor,
The load sensor has a sensor plate to which the elastic body is connected, and a strain gauge provided on the sensor plate,
A recess is provided on the surface of the support member opposite to the elastic body,
A part of the bottom of the recess is provided with a through hole,
The sensor plate is
A stationary portion placed on the bottom of the through hole,
A movable portion facing the through hole and receiving a force from the elastic body;
And a connecting portion that connects the movable portion to the stationary portion,
The strain gauge is an elevator weighing device provided in the connecting portion. Further comprising a plurality of rod connecting members respectively connected to the plurality of shackle rods,
The elevator weighing apparatus according to claim 2, wherein each of the elastic bodies is connected to the corresponding rod connector. A car, a plurality of suspension bodies that suspend the car, and a plurality of support springs that are respectively provided at the ends of the suspension body and that expand and contract according to the load in the car. A scale device that
Support member,
A load detector supported by the support member,
A plurality of elastic bodies that are connected to the load detection unit and that expand and contract according to the expansion and contraction of the corresponding support springs to apply a force to the load detection unit, and a plurality of shackles to which the plurality of suspension bodies are connected. A plurality of rod connectors, each connected to a rod,
The spring constant of each elastic body is smaller than the spring constant of the support spring,
Each of the elastic bodies is connected to the corresponding rod connector,
An elevator weighing apparatus in which each of the rod connectors has an eye nut into which the shackle rod is screwed. 9. The elevator weighing apparatus according to claim 7, wherein each of the rod connectors allows rotation of the shackle rod with respect to the elastic body. Further comprising a plurality of support spring connectors connected to the movable end of each of the support springs,
The elevator weighing apparatus according to any one of claims 1 to 6, wherein each of the elastic bodies is connected to the corresponding support spring connector. A car, a plurality of suspension bodies that suspend the car, and a plurality of support springs that are respectively provided at the ends of the suspension body and that expand and contract according to the load in the car. A scale device that
Support member,
A load detection unit supported by the support member, and a plurality of elastic bodies connected to the load detection unit that expand and contract according to the expansion and contraction of the corresponding support spring to apply a force to the load detection unit. ,
The spring constant of each elastic body is smaller than the spring constant of the support spring,
Further comprising a plurality of support spring connectors connected to the movable end of each of the support springs,
Each of the elastic bodies is connected to the corresponding support spring connector,
The connection position of each elastic body with respect to the support spring connector is a position deviated from directly above the corresponding shackle rod to which the corresponding suspension is connected,
A coil spring is used as each of the elastic bodies,
An elevator weighing apparatus in which each of the elastic bodies is arranged to be inclined with respect to an axis of the shackle rod. A car, a plurality of suspension bodies that suspend the car, and a plurality of support springs that are respectively provided at the ends of the suspension body and that expand and contract according to the load in the car. A scale device that
Support member,
A load detection unit supported by the support member, and a plurality of elastic bodies connected to the load detection unit that expand and contract according to the expansion and contraction of the corresponding support spring to apply a force to the load detection unit. ,
The spring constant of each elastic body is smaller than the spring constant of the support spring,
The support member is movable in the expansion and contraction direction of the elastic body,
An elevator weighing apparatus, wherein the support member is provided with a drive mechanism that moves the support member to simultaneously expand and contract the plurality of elastic bodies. When inspecting the pre-Symbol load detection unit, one of the load to the force in the same direction by the elastic body from the claim 1, further comprising a load application machine for adding the load detection portion to Claim 12 1 An elevator weighing apparatus according to the paragraph . The elevator weighing apparatus according to claim 13, wherein the load applying mechanism is an inspection bolt that can be screwed in the same direction as the force of the elastic body. The load applying mechanism is an inspection weight,
The elevator weighing apparatus according to claim 13, wherein the load detection unit is provided with a weight connection unit that connects the inspection weight.

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