JP2011042481A - Load detecting device of elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load detecting device of an elevator reducing the number of components, reducing a product cost and an assembling cost, dispensing with car suspension work for fixing a car in a hoistway and relieving tension of a main cable when installed in an existing car, and shortening a construction period. <P>SOLUTION: A detection plate 25 is fixed to a rope stopping plate 17 so that a bottom part 26 is positioned to be separated from a double nut 23 in a prescribed distance in a side opposite to the rope stopping plate 17 of the double nut 23, a detection spring 29 is arranged between a spring seat 21 and the bottom plate 26 respectively, and a deflection gauge 30 is arranged on a side plate 27 of the detection plate 25. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a load detection device for detecting an elevator car load.

  In the latest elevator control system, the motor torque at startup is adjusted in order to improve the ride comfort, so it is necessary to provide accurate in-car load information in real time by the load detection device. And in the repair work of an elevator, when updating to the latest control method, it is necessary to install a load detection device, and a reduction in product cost and installation cost of the load detection device is required.

  A conventional first load detecting device for an elevator includes a plurality of shackles inserted into and supported by an upper beam so as to be movable up and down, a main rope connected to each of the plurality of shackles, and a plurality of erected on the upper beam. A guide, a plurality of detection plates that are respectively inserted into the plurality of guides and moved up and down together with the shackle, and a differential transformer that is attached to the upper beam and detects the weight of the elevator car based on the vertical movement of the detection plates. The pulley is pivotally supported by a movable magnetic body of the differential transformer, and a wire rope is wound around the pulley, and both ends of the wire rope are connected to a plurality of detection plates. (For example, refer to Patent Document 1).

  A conventional second load detecting device for an elevator is inserted into an upper beam so as to be movable up and down, and a plurality of shackles connected to a main rope, and a striation seat that is fitted into a threaded portion of the shackle in the upper beam and faces each other And a strain gauge that is disposed on the striation seat and detects a load acting in the compression direction of the striation (see, for example, Patent Document 2).

  A conventional third load detecting device for an elevator includes a support plate fixed to a steel tower by welding, a hitch plate whose one end is rotatably supported by a support plate, and one end of a main rope connected to each other. A load cell that detects the load applied to the cage by being inserted between the rod inserted into the rod, the spring that is screwed between the nut and the hitch plate, and the hitch plate and the support plate. (For example, refer to Patent Document 3).

Japanese Patent Publication No. 08-005605 Japanese Patent Laid-Open No. 03-098975 Japanese Patent Laid-Open No. 06-255933

  However, the conventional first load detecting device for an elevator has a complicated structure and a large number of parts, so that the product cost increases, the assembly becomes complicated, and the assembly cost also increases. In addition, when installing the conventional load detection device for the first elevator in an existing car in order to upgrade to the latest control method in the repair work of the elevator, the car is fixed in the hoistway and the tension of the main rope is increased. A pulling basket hanging work occurs, and a complicated assembly work on site occurs, so that the construction period becomes long.

  In addition, the conventional second load detecting device for an elevator is constructed by arranging the strain gauges on the struts facing each other through the threaded portion of the shackle, thereby simplifying the structure and reducing the number of parts. Reduction is planned. However, when installing a conventional second elevator load detection device on an existing car in order to upgrade to the latest control method in elevator renovation work, the car is fixed in the hoistway and the tension of the main rope is increased. Since the pulling basket hanging work occurs, the construction period becomes long.

  In addition, since the conventional third load detecting device for the elevator has a hinge structure in which one end of the hitch plate is rotatably supported by the support plate, the total load applied to the plurality of main ropes is the same. However, because the load received by the load cell changes due to variations in the tension of the main rope, the detection accuracy decreases. In addition, when installing a conventional third elevator load detection device on an existing car in order to upgrade to the latest control method during elevator renovation work, it is necessary to change the structure of the leash stop and lift the car. Since the car hanging work that is fixed in the road and removes the tension of the main rope occurs, the construction period becomes long.

  The present invention has been made to solve the above-described problems, and can reduce the number of parts, reduce the product cost and the assembly cost, and when the car is installed in the existing car, It is an object of the present invention to provide an elevator load detection device that can eliminate the car hanging work to fix and remove the tension of the main rope and shorten the construction period.

  The elevator load detection device according to the present invention is connected to the end of each of the plurality of main ropes, the rope holding plate, the rope holding plate, and the plurality of main ropes. A plurality of shackle rods inserted through the leash retaining plate so as to be movable up and down, and an extension portion of each of the plurality of shackle rods from the leash retaining plate to be opposed to the leash retaining plate and in an externally fitted state. A spring seat to be mounted; a shackle spring to be fitted in an externally-fitted state between the tension stop plate of the plurality of shackle rods extending from the tension stop plate and the spring seat; A load detecting device for an elevator, comprising: a nut member threadedly attached to an extension portion of each shackle rod of the shackle rod and receiving the spring force of the shackle spring via the spring seat, Receiving part above A detection plate fixed to the rope holding plate so as to be positioned a predetermined distance away from the nut member on the opposite side of the rope holding plate, and the spring seat or the nut member and the load receiving portion. And a strain gauge disposed in a connecting portion for connecting the fixing portion of the detection plate to the rope stopper plate and the load receiving portion.

According to the present invention, the configuration of the load detection device is simplified, and the product cost and assembly cost can be reduced.
Further, when the load detecting device is installed in an existing car, the car hanging work for fixing the car in the hoistway and removing the tension of the main rope becomes unnecessary, and the construction period can be shortened.

It is sectional drawing which shows typically the structure of the elevator apparatus carrying the load detection apparatus of the elevator which concerns on Embodiment 1 of this invention. It is a partially broken side view which shows the A section of FIG. It is a top view which shows the distortion sensor applied to the load detection apparatus of the elevator which concerns on Embodiment 1 of this invention. It is sectional drawing which shows typically the structure of the elevator apparatus carrying the load detection apparatus of the elevator which concerns on Embodiment 2 of this invention. It is a partially broken side view which shows the B section of FIG. It is a bridge circuit which shows the strain gauge connection method applied to the load detection apparatus which concerns on Embodiment 3 of this invention. It is a side view which shows the mounting state of the strain gauge in the load detection apparatus which concerns on Embodiment 4 of this invention. It is a side view which shows the mounting state of the strain gauge in the load detection apparatus which concerns on Embodiment 5 of this invention.

Embodiment 1 FIG.
1 is a sectional view schematically showing a configuration of an elevator apparatus equipped with an elevator load detection apparatus according to Embodiment 1 of the present invention, FIG. 2 is a partially broken side view showing part A of FIG. 1, and FIG. These are the top views which show the distortion sensor applied to the load detection apparatus of the elevator which concerns on Embodiment 1 of this invention.

  1 and 2, a hoisting machine 3 including an electric motor 4 and a driving sheave 5 is installed in the upper machine room 2 of the hoistway 1. Three main ropes 7 are hung on the drive sheave 5, one end side of the main rope 7 is suspended in the hoistway 1, and the other end side is hung on the deflector wheel 6 and suspended in the hoistway 1. Further, the car 8 is fixed to one end of the three main ropes 7, and the counterweight 12 is fixed to the other end of the three main ropes 7. As a result, the car 8 and the counterweight 12 are suspended from the three main ropes 7 hung over the drive sheave 5 and the deflector 6 and are guided by guide rails (not shown). The inside of the hoistway 1 is arranged so that it can be raised and lowered.

  Also, in the pit 1 a of the hoistway 1, a shock absorber 13 is installed to alleviate the impact when the car 8 and the counterweight 12 go over the lowest floor for some reason and collide with the bottom of the hoistway 1. ing. The elevator control panel 14 is installed in the upper machine room 2 and includes a control circuit 15 composed of a microcomputer having a CPU, a memory, an input / output circuit, and the like. The control circuit 15 can exchange signals with devices in the car 8 via the control cable 16.

The car 8 is held by the car frame 9 with the car frame 9 configured in a frame shape by an upper frame 9a, a lower frame 9b, and a pair of vertical frames 9c, and a car floor 11 placed and fixed on the lower frame 9b. And a basket room 10. And the rope stopping plate 17 is fixed to the lower surface of the upper frame 9a, and three through holes 18 are formed.
The shackle rod 20 is connected to one end of the main rope 7 and is inserted through a through hole 18 formed in the rope stopping plate 17. The spring seat 21 is fitted to the shackle rod 20 so as to face the rope holding plate 17, and the shackle spring 22 is fitted to the shackle rod 20 and is contracted between the rope holding plate 17 and the spring seat 21. Yes. Further, a double nut 23 as a nut member is screwed to the male threaded portion 24 of the shackle rod 20 to receive the spring force of the shackle spring 22 via the spring seat 21 and prevent the spring seat 21 from coming off from the shackle rod 20. ing.

  The detection plate 25 is made of, for example, a steel plate, and includes a bottom plate 26 serving as a load receiving portion, a pair of side plates 27 serving as a connecting portion extending at right angles from both sides of the bottom plate 26, and a pair of side plates 27. It is formed by being formed into a substantially U-shape comprising a pair of flange portions 28 as a fixed portion extending in a direction away from each other at a right angle from the front end. Further, three shackle rod insertion holes 37 a are formed in the bottom plate 26 of the detection plate 25 corresponding to the arrangement of the shackle rods 20. This detection plate 25 is attached to each shackle rod 20 with the tip of the shackle rod 20 inserted through each of the shackle rod insertion holes 37a, with a predetermined gap between the double nut 23 and the bottom plate 26. The shackle spring 22, the spring seat 21, and the double nut 23 are disposed so as to cover the pair of flange portions 28. The pair of flange portions 28 are fastened to the rope fastening plate 17 or welded to the upper frame 9 a. A detection spring 29 is contracted between each spring seat 21 and the bottom plate 26 of the detection plate 25. Here, the shackle spring 22 is set to a spring constant that is extremely larger than the spring constant of the detection spring 29, for example, 50 times the spring constant of the detection spring 29.

  The strain gauge 30 is a foil strain gauge, and as shown in FIG. 3, a resistor 32 made of a lattice-shaped metal stay is formed on the surface of a base substrate 31 made of an electrically insulating thin resin. The surface is laminated and gauge leads 33 are attached to both ends of the resistor 32. The strain gauge 30 is adhered and attached to the outer walls of the U-shaped side plates 27 of the detection plate 25. Further, the cover 35 is fixedly attached to the rope retaining plate 17 so as to cover the detection plate 25 by inserting the shackle rod 20 into the shackle rod insertion hole 37b. Furthermore, the gauge lead 33 of the strain gauge 30 is connected to the amplifier 36, and the output of the strain gauge 30 is amplified by the amplifier 36 and transmitted to the control circuit 15 of the elevator control panel 14 via the control cable 16.

  Here, the detection plate 25, the detection spring 29, the strain gauge 30, the cover 35, and the like constitute a load detection device that detects the load on the car 8. Although not shown in detail, the other end (the counterweight side) of the main rope 7 is also a shackle rod, a spring seat, a shackle spring, Using nuts, they are fastened to a rope holding plate fixed to the upper frame of the counterweight frame.

  In the elevator apparatus configured as described above, the car 8 and the counterweight 12 are suspended in a suspension manner on the three main ropes 7 hung over the drive sheave 5 and the deflector 6 and 1: 1 roping. It has become.

  The load of the car 8 is supported by the shackle rod 20 via a shackle spring 22 interposed between the rope stopping plate 17 and the spring seat 21. Therefore, when the load of the car 8 fluctuates, the shackle spring 22 expands and contracts according to the fluctuation of the load of the car 8. Since the detection spring 29 interposed between the spring seat 21 and the bottom plate 26 is set to a spring constant of about 1/50 of the spring constant of the shackle spring 22, the total length x of the detection spring 29 is It is forcibly changed by the expansion and contraction of the shackle spring 22. Since the detection plate 25 is made of a rigid body, a reaction force generated by a change in the total length x of the detection spring 29 acts on the detection plate 25 and a minute distortion occurs in the detection plate 25.

  The strain generated in the detection plate 25 acts as a tensile force (or compressive force) on the resistor 32 of the strain gauge 30 disposed on the outer wall of the side plate 27, and the resistance value of the resistor 32 increases (or decreases). . A signal indicating the change in the resistance value is output to the amplifier 36 via the gauge lead 33, amplified by the amplifier 36, and transmitted to the control circuit 15 via the control cable 16. In the memory of the control circuit 15, a relationship map between the loaded load and the output value of the strain gauge 30 is stored in advance. Therefore, the control circuit 15 calculates the loaded load from the map stored in the memory based on the output from the strain gauge 30.

  As described above, according to the first embodiment, it is possible to detect the load variation in the car 8, that is, the load variation in the car 8 in real time, so that the motor torque at the time of startup is based on the load fluctuation in the car 8. Can be adjusted, and an elevator apparatus with a good riding comfort can be realized.

  The load detection device according to the first embodiment includes a detection plate 25 attached to the leash plate 17 so as to cover an extension portion of the shackle rod 20 from the leash plate 17, and a spring attached to the shackle rod 20. A detection spring 29 disposed between the seat 21 and the bottom plate 26 of the detection plate 25 and a strain gauge 30 attached to the side plate 27 of the detection plate 25 are provided. Therefore, the configuration of the load detection device is simplified, the number of parts is reduced, and the assembly is facilitated. Therefore, the assembly cost and the assembly time of the load detection device can be reduced.

  Further, since the detection springs 29 are respectively disposed between the spring seats 21 attached to the three shackle rods 20 and the bottom plate 26, the bottom plate 26 of the detection plate 25 due to variations in the tension of the main rope 7. The variation of the load received by the strain gauge 30 is suppressed, and the decrease in detection accuracy by the strain gauge 30 is suppressed.

  Further, when the load detecting device is mounted on the existing elevator device, the car hanging work for fixing the car 8 in the hoistway 1 and releasing the tension of the main rope 7 becomes unnecessary, and the shackle that receives the load of the car 8 is also provided. There is no need to change the support structure of the rod 20, and the construction period, that is, the stop period of the elevator apparatus can be significantly shortened.

  Further, the shackle rod insertion holes 37a and 37b are formed in the detection plate 25 and the cover 35, and when the detection plate 25 and the cover 35 are attached, the shackle rod 20 is inserted through the shackle rod insertion holes 37a and 37b. . Therefore, when the load detection device is attached to the clasp 17, the load detection device does not protrude below the shackle rod 20, so that interference with other devices installed on the car can be suppressed, and load detection can be performed. The device can be easily attached.

Embodiment 2. FIG.
4 is a cross-sectional view schematically showing the configuration of an elevator apparatus equipped with an elevator load detection apparatus according to Embodiment 2 of the present invention, and FIG. 5 is a partially broken side view showing part B of FIG.

In FIG. 4, one end of the main rope 7 is fixed to the floor 2a of the upper machine room 2 and lowered, and is hung on a sheave 38 attached to the upper frame 9a so as to be rotatable around a horizontal axis. The sheave 5 is hung and lowered by the sheave 6 and the sheave 39 attached to the counterweight 12 so as to be rotatable around the horizontal axis. The other end is fixed to the floor 2a.
Thus, this elevator apparatus is a 1: 2 roping elevator apparatus.

In FIG. 5, three insertion holes 40 are formed in the floor 2 a of the upper machine room 2. And the rope stopping plate 17 is fixed to the upper surface of the floor 2a with the through hole 18 aligned with the insertion hole 40.
The shackle rod 20 is connected to one end of the main rope 7 and is inserted from below into an insertion hole 40 drilled in the floor 2a and a through hole 18 drilled in the rope stopping plate 17. The spring seat 21 is fitted to the extension portion of the shackle rod 20 from the rope holding plate 17 so as to face the rope holding plate 17, and the shackle spring 22 is fitted to the shackle rod 20, and the rope holding plate 17 and the spring are fixed. It is disposed between the seat 21. Further, a double nut 23 is screwed onto the male thread portion 24 of the shackle rod 20 to prevent the spring seat 21 from coming off from the shackle rod 20.

  The detection plate 25 is disposed so that the tip of the shackle rod 20 is inserted into each of the shackle rod insertion holes 37a and covers the shackle spring 22, the spring seat 21, and the double nut 23 attached to the shackle rod 20. The flange portion 28 is fastened and fixed to the rope stopping plate 17 or welded. A detection spring 29 is interposed between the spring seat 21 and the bottom plate 26 of the detection plate 25. The strain gauge 30 is attached to the outer wall of the U-shaped side plates 27 of the detection plate 25 by being adhered. Further, a cover 35 is attached to the rope stopping plate 17 so as to cover the detection plate 25 by inserting the shackle rod 20 into the shackle rod insertion hole 37b. Furthermore, the gauge lead 33 of the strain gauge 30 is connected to the amplifier 36, and the output of the strain gauge 30 is amplified by the amplifier 36 and transmitted to the control circuit 15 of the elevator control panel 14 via the control cable 19.

  Although not shown in detail, the other end (the counterweight side) of the main rope 7 is also a shackle rod, a spring seat, a shackle spring, a double, similarly to the leash stop at one end (cage side) of the main rope 7. A nut is used to fasten to the rope holding plate fixed to the floor 2a.

  Also in the second embodiment, the load of the car 8 is supported by the shackle rod 20 via the shackle spring 22 and the double nut 23 interposed between the rope retaining plate 17 and the spring seat 21. Therefore, when the load of the car 8 fluctuates, the shackle spring 22 expands and contracts according to the fluctuation of the load of the car 8, and the entire length x of the detection spring 29 is forcibly changed by the expansion and contraction of the shackle spring 22. Then, a reaction force generated by a change in the total length x of the detection spring 29 acts on the detection plate 25, and a minute distortion occurs in the detection plate 25.

  The strain generated in the detection plate 25 acts as a tensile force (or compressive force) on the resistor 32 of the strain gauge 30 disposed on the outer wall of the side plate 27, and the resistance value of the resistor 32 increases (or decreases). . A signal indicating the change in the resistance value is output to the amplifier 36 through the gauge lead 33, amplified by the amplifier 36, and transmitted to the control circuit 15 through the control cable 19. Then, the control circuit 15 calculates the loaded load from the map stored in the memory based on the output from the strain gauge 30.

As described above, also in the second embodiment, since the fluctuation of the loaded load in the car 8, that is, the load fluctuation in the car 8, can be detected in real time, the motor torque at the time of start-up is based on the load fluctuation in the car 8. An elevator device that can be adjusted and has good riding comfort can be realized.
Also in the load detection device according to the second embodiment, the shackle rod 20 is mounted on the detection plate 25 and the shackle rod 20 that are attached to the rope holding plate 17 so as to cover the extended portion of the shackle rod 20 from the rope holding plate 17. Since the detection spring 29 disposed between the spring seat 21 and the bottom plate 26 of the detection plate 25 and the strain gauge 30 attached to the side plate 27 of the detection plate 25 are provided, Similar effects can be obtained.

In the second embodiment, one end of the main rope is fixed to the floor of the upper machine room. However, a support angle is installed on the upper part of the hoistway, and one end of the main rope is fixed to the support angle. May be.
In the first and second embodiments, the car is moved up and down by three main ropes. When the number of main ropes increases, the shackle rod insertion holes are detected according to the number of main ropes. A plate and a cover may be perforated, and a detection spring may be interposed between each spring seat and the detection plate.

In the first and second embodiments, the output of the strain gauge is described as being input to the amplifier. However, the output of the strain gauge may be input to the A / D converter.
In the first and second embodiments, the detection spring is disposed between the spring seat and the bottom plate. However, the receiving seat is attached to the shackle rod from the tip side, and the nut is further attached to the shackle rod. A detection spring may be disposed between the receiving plate and the bottom plate that are screwed and fixed between the nut and the double nut. Here, the receiving seat is assumed to be included in the nut member.

Embodiment 3 FIG.
FIG. 6 is a bridge circuit showing a strain gauge connection method applied to the load detection apparatus according to Embodiment 3 of the present invention.

In the third embodiment, as shown in FIG. 6, a strain gauge 30 is connected to one side, and a 1 gauge three-connection bridge circuit is connected to the three sides where the fixed resistors R1, R2, and R3 remain. ing.
In the bridge circuit configured in this way, three lead wires are used for the strain gauge 30, and the resistance components of the two lead wires subjected to the same temperature change are respectively inserted into adjacent sides of the bridge. Therefore, the temperature influence of the lead wire is excluded from the output of the bridge.

  According to the third embodiment, since the strain gauge 30 forms a 1-gauge 3-connection bridge circuit, the influence of the lead wire temperature is excluded, and a stable output is obtained even if the ambient temperature changes. be able to.

Embodiment 4 FIG.
FIG. 7 is a side view showing a mounted state of a strain gauge in the load detection device according to Embodiment 4 of the present invention.

In FIG. 7, two through holes 42 are formed in the side plate 27 of the detection plate 25 </ b> A across the region where the strain gauge 30 is disposed.
Other configurations are the same as those in the first embodiment.

  First, since the detection plate 25A is formed in a U shape, the reaction force generated by the change in the total length x of the detection spring 29 acts perpendicularly on the bottom plate 26 of the detection plate 25A. That is, the reaction force generated by the change in the total length x of the detection spring 29 acts on the side plate 27 of the detection plate 25A in the direction perpendicular to the bottom plate 26, that is, the vertical direction. Therefore, the through-hole 24 is provided in the area parallel to the bottom plate 26 of the side plate 27 in the region where the strain gauge 30 is disposed, that is, the horizontal cross-sectional area is larger than the horizontal cross-sectional area of other regions of the side plate 27. Minutes get smaller.

  According to the fourth embodiment, since the cross-sectional area perpendicular to the direction in which the reaction force generated by the change of the detection spring 29 acts in the area where the strain gauge 30 is disposed becomes small, the strain gauge 30 is caused by the load of the car. The distortion generated in the arrangement area is enlarged. Thereby, the resolution of detection by the strain gauge 30 is increased, and the loaded load can be detected with high accuracy.

Embodiment 5 FIG.
FIG. 8 is a side view showing a state in which a strain gauge is mounted in a load detection device according to Embodiment 5 of the present invention.

In FIG. 8, the strain gauge unit 45 is configured as an integrated body by fixing the strain gauge 30 on a steel plate substrate 46. The strain gauge unit 45 is arranged so as to straddle the through hole 47 formed in the side plate 27 of the detection plate 25B in the direction in which the reaction force generated by the change of the detection spring 29 acts, and is tightened to the side plate 27. It is fixed.
Other configurations are the same as those in the first embodiment.

Also in the fifth embodiment, the arrangement area of the strain gauge 30, that is, the horizontal cross-sectional area of the substrate 46 is smaller than the horizontal cross-sectional area of the other area of the side plate 27. Similarly, the resolution of detection by the strain gauge 30 is increased, and the loaded load can be detected with high accuracy.
Further, since the strain gauge unit 45 is configured as a single body by fixing the strain gauge 30 on the substrate 46, it can be easily replaced even if the strain gauge 30 is replaced during maintenance. Can do.

In each of the above embodiments, a foil strain gauge is used as the strain gauge. However, the strain gauge is not limited to the foil strain gauge, and a linear strain gauge or a semiconductor strain gauge may be used.
In each of the above embodiments, the load detecting device is applied to an elevator device having an upper machine room above the hoistway. However, the load detecting device is applied to a laterally driven elevator device or a machine room-less elevator device. May be.

  DESCRIPTION OF SYMBOLS 1 Hoistway, 2a Floor, 8 Car, 9 Car frame, 9a Upper frame, 17 Tail plate, 20 Shackle rod, 21 Spring seat, 22 Shackle spring, 23 Double nut (nut member), 25 Detection plate, 26 Bottom plate ( Load receiving part), 27 Side plate (connecting part), 28 Flange part (fixed part), 37a Shackle rod insertion hole, 29 Detection spring, 30 Strain gauge, 31 Base substrate, 32 Resistor, 33 Gauge lead, 45 Strain gauge unit .

Claims (7)

Whether the hoistway can be moved up and down by a plurality of main ropes,
A leash plate,
A plurality of shackle rods connected to the respective car-side ends of the plurality of main ropes, and inserted through the rope retaining plate so as to be movable up and down;
A spring seat which is mounted in an externally fitted state opposite to the clasp plate to the extension portion from the clasp plate of each of the plurality of shackle rods;
A shackle spring mounted in an externally fitted state between the tensioning plate and the spring seat of each of the plurality of shackle rods extending from the tensioning plate;
A load detecting device for an elevator, comprising: a nut member threadedly attached to an extension portion of each of the plurality of shackle rods from the clasp plate and receiving a spring force of the shackle spring via the spring seat. ,
A detection plate fixed to the leash plate so that the load receiving portion is positioned on the opposite side of the nut member to the leash plate and separated from the nut member by a predetermined distance;
Detection springs disposed respectively between the spring seat or the nut member and the load receiving portion;
A strain gauge disposed in a connecting portion for connecting the fixing portion of the detection plate to the rope stopping plate and the load receiving portion;
An elevator load detection device characterized by comprising:   2. The elevator load detection device according to claim 1, wherein the rope stopping plate is fixed to an upper frame of the car frame.   2. The elevator load detection device according to claim 1, wherein the rope stop plate is fixed to a hoistway.   The shackle rod insertion hole is formed in the load receiving portion, and the detection plate is fixed to the rope stop plate by inserting the shackle rod into the shackle rod insertion hole. The elevator load detection device according to claim 3.   The horizontal cross-sectional area of the region of the connecting portion where the strain gauge is disposed is smaller than the horizontal cross-sectional area of the other region of the connecting portion. The elevator load detection device according to any one of the preceding claims.   6. The strain gauge according to claim 1, wherein the strain gauge is connected to one side and connected to three sides where the fixed resistance remains to form a one-gauge three-connection bridge circuit. The elevator load detection apparatus as described.   The elevator load detection device according to any one of claims 1 to 6, wherein the strain gauge is unitized.

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