JP2008174379A - Load detecting device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple-structured load detecting device for an elevator capable of detecting a load of an elevator car by accurately weighing a load to be applied to a terminal lock portion of a main rope. <P>SOLUTION: This load detecting device 100 is structured by dividing a plurality of ropes structuring the main rope 2 into a left side pair of ropes 2a-2c and a right side pair of ropes 2d-2f, and arranging them symmetrically in right and left or with a redetermined positional relation between them, and arranging a load cell 14 between them. With this structure, a hitch plate 16 is prevented from being tilted, and a load applying to the main rope 2 can be accurately weighed by the single load cell 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an elevator load detection device, and more particularly, to a passenger or a baggage loaded on a passenger car by accurately measuring a load acting on an end locking portion of a main rope while having a simple configuration. The present invention relates to a technique for reliably detecting the weight of the like.

Conventionally, operation control such as controlling the torque of a hoisting machine or issuing a full warning by detecting the weight of passengers or luggage loaded in an elevator car is performed.
Therefore, in the elevator described in the following Patent Document 1, the load capacity of the elevator is detected by measuring the deflection amount of the anti-vibration rubber supporting the lower part of the car using a differential transformer. It has become.

  Moreover, in the elevator described in the following patent document 2, a plurality of load cells are arranged at the terminal locking portion of the main rope that suspends the car by 2: 1 roping, and a plurality of load cells are formed. The load acting on each of the ropes is individually detected.

  Furthermore, in the elevator described in Patent Document 3 below, a single displacement measuring device is disposed at the end locking portion of the main rope that suspends the car by 2: 1 roping, and according to the loaded load. The load on the elevator is detected by measuring the vertical displacement of the plate interlocked with the shackle rod that moves up and down.

JP 11-335027 A JP 2005-519209 A JP 2003-2549 A

  However, in the case of measuring the amount of deflection of the anti-vibration rubber using a differential transformer, the change in the amount of deflection of the anti-vibration rubber is normal when the temperature in the hoistway suddenly decreases in cold districts. A different hysteresis curve is drawn, and there is a possibility that the load load cannot be detected accurately.

  In addition, in the case where a load cell is provided for each rope and the rope load is individually measured, the number of load cells corresponding to the number of ropes constituting the main rope is required, which increases the cost, and individually. The load values obtained from the load cells must be summed, and the calculation process is complicated.

  Furthermore, in the case where the vertical displacement of a plate that moves up and down in conjunction with the shackle rod is measured by a single displacement measuring instrument, the plate must be guided so as to move up and down without tilting. Expensive parts such as bearings and linear bushes must be used.

  Accordingly, the object of the present invention is to eliminate the above-mentioned problems of the prior art and to accurately measure the load acting on the end locking portion of the main rope while ensuring a simple structure, thereby ensuring the load capacity of the car. It is an object of the present invention to provide a load detecting device for an elevator load that can be detected.

The means described in claim 1 for solving the above problem is as follows.
A device for detecting a load carried by the car by measuring a load acting on an end locking portion of a main rope that suspends the elevator car;
A locking member in which the ends of the plurality of ropes constituting the main rope are respectively locked in the vertical direction;
A support means for supporting the locking member in the vertical direction;
A single load cell sandwiched in the vertical direction by the locking member and the support means,
The plurality of ropes are separated from a left rope set and a right rope set so as to sandwich the single load cell in the left-right direction, and are locked to the locking member.

The end locking portion of the main rope is not limited to the portion where the end of the main rope that suspends the car by 2: 1 roping is locked to the fixed side of the hoistway. It also includes a portion for locking the end of the main rope that is suspended to the car or the counterweight.
The left and right rope sets are each composed of an equal number of ropes or a different number of ropes, and are positioned so as to be symmetrical with respect to a single load cell while being locked. Can be locked to.
Furthermore, each rope can be locked to the locking member using a shackle rod and a coil spring.

That is, the elevator load detection device according to claim 1 divides a plurality of ropes constituting the main rope into a left rope group and a right rope group and separates them in the left-right direction. Since the load cell is arranged between them, the load acting on the main rope can be accurately measured by a single load cell.
Thereby, although it is simple structure, the load which acts on the terminal latching | locking part of a main rope can be measured correctly, and the loading load of a car can be detected reliably.

  According to a second aspect of the present invention, the left rope set and the right rope set are positioned so that bending moments acting on the locking members are symmetrical in the left-right direction with respect to the load cell. And is locked to the locking member.

Specifically, for example, when the left rope set and the right rope set are each composed of three ropes, the three ropes are symmetrical with respect to the horizontal center line of a single load cell. In other words, the ropes are arranged at the same distance X1 from the center line.
On the other hand, for example, when the left rope group is composed of three ropes and the right rope group is composed of two ropes, the left-right direction of the center line of the single load cell and the left rope group When the distance is X2, and the distance between the center line and the right rope set is X3, X2: X3 = 2: 3. In other words, the ratio between the distance X2 and the distance X3 is set to be an inverse ratio between the number of ropes in the left rope group and the number of ropes in the right rope group.
Furthermore, each rope of the left rope group and each rope of the right rope group are positioned and arranged so as to be symmetrical in the front-rear direction with respect to the center line in the front-rear direction of the single load cell.

That is, in the elevator load detection device according to claim 2, the bending moment caused by the rope load caused by the left rope set and the right rope set acting on the locking member is applied to a single load cell. It becomes symmetrical back and forth and right and left.
Thereby, since it can prevent that the latching member inclines and the load of the diagonal direction acts on a load cell, the load which is acting on the main rope can be measured more correctly with a single load cell.

According to a third aspect of the present invention, the support means includes a support member that supports the end locking portion, an attachment member to which the single load cell is attached, the attachment member, and the support member. And an elastic body sandwiched in the vertical direction,
A switch that operates when the elastic body is elastically deformed in the vertical direction and the attachment member approaches a predetermined distance from the support member is attached to the attachment member or the support member. And

That is, in the elevator load detection device according to claim 3, the load acting on the main rope is increased, the vertical deformation amount of the elastic body is increased, and the distance between the mounting member and the support member is reduced. The switch is activated when a certain distance is reached.
Thereby, when the loaded load of the car exceeds a predetermined value, a signal indicating full or overloaded can be sent to the operation control device of the elevator.

In addition, as described in claim 4 or claim 5, the elastic body can be a vibration-proof member made of a polymer material or a metal spring member.
Thereby, it is possible to act on the load cell while buffering the fluctuation component of the load acting on the main rope.

  As is apparent from the above description, according to the present invention, an elevator capable of accurately detecting the load acting on the car by accurately measuring the load acting on the end locking portion of the main rope while having a simple configuration. It is possible to provide a loaded load detection device.

  Hereinafter, each embodiment of the elevator load detection device according to the present invention will be described in detail with reference to FIGS. 1 to 4, but the same reference numerals are used for the same portions, and redundant descriptions are omitted. .

First Embodiment First, a load detection device according to a first embodiment will be described with reference to FIGS.

Before that, the structure of the end locking portion of the conventional main rope will be described. The conventional end locking portion 1 shown in FIG. 5 is a main rope 2 in which a car not shown is suspended by 2: 1 roping. The six ropes 2a to 2f that constitute the shaft are locked to the fixed side of the hoistway, and a hitch plate (between a pair of left and right support beams (support members) 3a and 3b extending in parallel in the front-rear direction. (Locking member) 4 is suspended.
And each shackle rod 5a-5f attached to the front-end | tip of each rope 2a-2f is penetrated by the six insertion holes penetrated by the hitch plate 4 at predetermined intervals, and is extended upwards, The male screw part Coil springs 7 are attached by double lock nuts 6a and 6b that are screwed onto the ropes to buffer fluctuations in the rope load acting on the ropes 2a to 2f.

That is, in the terminal locking portion 1 of the conventional main rope, the ropes 2a to 2f are disposed close to each other between the pair of left and right support beams 3a and 3b.
On the other hand, in the loaded load detection device 100 of the first embodiment shown in FIG. 1, with respect to one support beam 11 extending horizontally in the front-rear direction (direction perpendicular to the illustrated paper surface), Three ropes (left rope sets) 2a to 2c are arranged on the left side, and three ropes (right rope sets) 2d to 2f are arranged symmetrically on the right side.

An attachment plate (attachment member) 12 is fixed to the upper surface of the support beam 11 with a bolt 13, and constitutes a support means for supporting the end locking portion together with the support beam 11.
A single load cell 14 having a substantially rectangular parallelepiped shape having a narrow width in the left-right direction and narrow in the front-rear direction is attached to the upper surface of the mounting plate 12 by a pair of front and rear bolts 15.
Further, a hitch plate (locking member) 16 is fixed to the upper surface of the load cell 14 by a pair of front and rear bolts 17.

Thereby, the single load cell 14 is clamped by the hitch plate 16 and the mounting plate 12 in the vertical direction, and the resultant force of the load acting on the hitch plate 16 from each of the ropes 2a to 2f acts.
The value of the resultant force of the rope load measured by the load cell 14 is input to an elevator operation control device (not shown), and used for operation control such as controlling the drive torque of the hoist and issuing a full warning.

At this time, as shown in FIG. 2 as a plan view, the shackle rods 5a to 5f, and therefore the ropes 2a to 2f, are located with respect to the center line C1 in the left-right direction and the center line C2 in the front-rear direction. These are positioned and arranged so as to be symmetrical in the left-right direction and the front-rear direction.
More specifically, the left shackle rods 5a to 5c (left rope sets 2a to 2c) are positioned and disposed at a position separated from the center line C1 by a distance X1 to the left, and the right shackle The rods 5d to 5f (right rope sets 2d to 2f) are also positioned and arranged at positions separated from the center line C1 by a distance X1 on the right side.
Further, the left shackle rods 5a to 5c (left rope sets 2a to 2c) are arranged at a distance Y1 so as to be symmetrical with respect to the center line C2, and the right shackle rods 5d to 5f. (Rope sets 2d to 2f on the right side) are also arranged so as to be symmetrical with respect to the center line C2 with a distance Y1.

As a result, the bending moment caused by the rope load that the left rope sets 2 a to 2 c and the right rope sets 2 d to 2 f act on the hitch plate 16 is laterally and longitudinally with respect to the single load cell 14. It becomes symmetric.
As a result, the hitch plate 16 does not tilt and no load is applied to the load cell 14 in an oblique direction. Can be measured.
Furthermore, since the load cell 14 has only one signal indicating the load to be input to the operation control device, the rope loads that the ropes 2a to 2f act on the hitch plate 16 as in the device described in Patent Document 2 above. Therefore, the elevator operation control can be performed smoothly.

On the other hand, in the loaded load detection device 150 of the modification shown in FIG. 3, the main rope 2 is composed of five ropes 2a to 2e, and therefore there are five shackle rods 5a to 5e.
In this case, the bending moments caused by the rope loads applied to the hitch plate 16 by the left rope sets 2a to 2c and the right rope sets 2d and 2e are laterally and longitudinally applied to the single load cell 14, respectively. The arrangement of the shackle rods 5a to 5e must be devised so as to be symmetrical.

Accordingly, the left shackle rods 5a to 5c (left rope sets 2a to 2c) are positioned and disposed at a position separated by a distance X2 to the left side from the center line C1 in the left-right direction. 5d, 5e (right rope sets 2d, 2e) are positioned and arranged at a position separated from the center line C1 by a distance X3 on the right side.
The left shackle rods 5a to 5c (left rope sets 2a to 2c) are arranged at a distance Y1 so as to be symmetric with respect to the center line C2 in the front-rear direction. 5d and 5e (right rope sets 2d and 2e) are arranged so as to be symmetrical with respect to the center line C2 with a distance Y2.

At this time, the values of X2 and X3 are determined to be X2: X3 = 2: 3.
In other words, the ratio between the distance X2 and the distance X3 is determined to be an inverse ratio between the number of ropes of the left rope sets 2a to 2c and the number of ropes of the right rope sets 2d and 2e.
Therefore, assuming that the value of the rope load W acting on the ropes 2a to 2e is equal, the value of the bending moment on the left side acting on the hitch plate 16 is 3 × W × X2, and the value of the bending moment on the right side is 2 × W × X3. Since the ratio of X2: X3 = 2: 3 is 3 × X2 = 2 × X3, the value of the bending moment on the left side is 3 × W × X2 = 2 × W × X3. The value is exactly equal to 2 × W × X3.

That is, even when the number of ropes constituting the main rope 2 is an odd number as in the load detection device 150 of the present modification, the left rope sets 2a to 2c and the right rope sets 2d and 2e are By appropriately positioning and arranging, the bending moment due to the rope load acting on the hitch plate 16 can be made symmetrical in the left-right direction.
As a result, the hitch plate 16 does not tilt and no load is applied to the load cell 14 in an oblique direction. Therefore, the resultant force of the rope load applied to the hitch plate 16 by the ropes 2a to 2e is obtained by the single load cell 14. Can be measured accurately.

Second Embodiment Next, a loaded load detection device according to a second embodiment will be described with reference to FIG.

  The load detection device 200 according to the second embodiment includes a rectangular parallelepiped vibration-proof member made of a polymer material between the support beam 11 and the mounting plate 12 in the load detection device 100 according to the first embodiment described above. Elastic bodies) 21 and 21 are interposed and fixed with bolts 22 and 22, and a safety switch 23 is attached to the end of the mounting plate 12.

As a result, when the load acting on the main rope 2 is increased and the vibration isolating members 21 and 21 are greatly deformed in the vertical direction, the distance between the support beam 11 and the mounting plate 12 is reduced, and the distal end portion 23a of the safety switch 23 is supported. The upper surface 11a of the beam 11 is contacted.
Then, since this switch 23 is activated and a signal indicating full or overloading is sent to the elevator operation control device, an alarm can be issued to passengers in the car.

Further, as described above, the bending moment caused by the rope load caused by the left rope sets 2 a to 2 c and the right rope sets 2 d to 2 f acting on the hitch plate 16 is laterally applied to the single load cell 14. It is symmetrical in the front-rear direction.
As a result, the hitch plate 16, and thus the mounting plate 12, does not tilt with respect to the support beam 11, so that the safety switch 23 can be reliably operated according to the load acting on the main rope 2.
Further, the vibration isolating members 21 and 21 can cause the load cell 14 to act on the load cell 14 while buffering the fluctuation component of the load acting on the main rope 2.

As mentioned above, although each embodiment of the elevator load detection apparatus according to the present invention has been described in detail, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications are possible.
For example, in the first embodiment described above, the terminal locking portion of the main rope 2 that suspends the car by 2: 1 roping has been described as an example, but the car is suspended by 1: 1 roping. Needless to say, the structure of the load detection device of the present invention can be applied to a portion where the main rope is connected to the car.
Moreover, in 2nd Embodiment mentioned above, although the safety switch 23 is attached to the attachment plate 2, it can also be attached to the support beam 11, and is attached to the hitch plate 16 which moves up and down integrally with the attachment plate 12. You can also.

The front view which shows the loading load detection apparatus of 1st Embodiment. The top view which shows arrangement | positioning of the rope in the loading load detection apparatus shown in FIG. The top view which shows the modification of arrangement | positioning of the rope shown in FIG. The right view which shows the loading load detection apparatus of 2nd Embodiment. The perspective view which shows the conventional main rope terminal latching | locking part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Conventional main rope terminal locking part 2 Main rope 2a-2f Each rope which comprises the main rope 3a, 3b Support beam 4 Hitch plate (locking member)
5a to 5f Shackle rod 6a, 6b Double lock nut 7 Coil spring 10 Support means 11 Support beam (support member)
12 Mounting plate (Mounting member)
13 bolt 14 load cell 15 bolt 16 hitch plate (locking member)
17 Bolt 21 Anti-vibration member (elastic body)
22 Bolt 23 Safety switch 23a Tip portion 100 Load load detection device 150 of the first embodiment Load load detection device 200 of a modified example Load load detection device of the second embodiment

Claims (5)

A device for detecting a load carried by the car by measuring a load acting on an end locking portion of a main rope that suspends the elevator car;
A locking member in which the ends of the plurality of ropes constituting the main rope are respectively locked in the vertical direction;
A support means for supporting the locking member in the vertical direction;
A load cell sandwiched in the vertical direction by the locking member and the support means;
With
Elevator load detection, wherein the plurality of ropes are spaced apart from a left rope set and a right rope set so as to sandwich the load cell in the left-right direction and are locked to the locking member. apparatus.   The left rope group and the right rope group are positioned so that bending moments acting on the locking member are symmetrical in the left-right direction with respect to the load cell, and locked to the locking member. The elevator load detection device according to claim 1, wherein: The support means includes a support member that supports the end locking portion, an attachment member to which the single load cell is attached, and an elastic body that is clamped in the vertical direction by the attachment member and the support member. Have
A switch that operates when the elastic body is elastically deformed in the vertical direction and the attachment member approaches a predetermined distance from the support member is attached to the attachment member or the support member. The elevator load detection device according to claim 1 or 2.   The elevator load detecting device according to claim 3, wherein the elastic body is a vibration-proof member made of a polymer material.   The elevator load detection device according to claim 3, wherein the elastic body is a metal spring member.

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