JP2007284169A - Load detection device for elevator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a load detection device capable of accurately detecting loading load not dependent on the form of a car. <P>SOLUTION: The load detection device 10A is the one provided on a rope hitch 9A for retaining an end of a plurality of main ropes 2 for hanging the car 6 of the elevator on a hoistway 3, and is provided with a base plate 11; a vibration-proof rubber (elastic member) 12; a target 13; and a distance measurement sensor 14. The base plate 11 has an insertion hole 111 penetrated with a shackle rod 91 and is arranged on a hitch plate 92 in parallel to the hitch plate 92 at a side where the main rope 2 is extended. The vibration-proof rubber 12 is provided between the hitch plate 92 and the base plate 11. The target 13 is fixed to the hitch plate 92. The distance measurement sensor 14 is arranged at a side where the base plate 11 is fixed, and measures a position of the target 13 along a direction that the shackle rod 91 is extended. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an elevator provided with a load detection device that detects a loaded load applied to a ride.

  The elevator includes a load detection device that detects a load loaded on the ride. In the elevator described in Patent Document 1, the load detection device includes a case where the load detection device is provided between the riding floor and the frame, a case where the load detection device is provided between the side wall of the riding frame and the vertical frame of the frame, The case where it provides between a ceiling and the upper beam of a fence frame is shown. The load detection device includes a push button type load detection switch provided on the saddle side or the saddle frame side, and an operator extending from the saddle frame side or the saddle side corresponding to the load detection switch.

  The riding board is supported by a vibration-proof rubber disposed between the floor and the frame. When the load is applied to the riding rod and the anti-vibration rubber is compressed, and the operator presses the load detection switch, the load detection device detects that the specified load has been exceeded.

  The elevator described in Patent Document 2 includes, as a load detection device, a differential transformer for detecting the amount of displacement of the cage with respect to the cage frame and a limit switch for detecting a limit load set as a maximum load capacity. ing. The differential transformer and the limit switch are installed between the norikura floor and the lower beam of the frame. The riding board is supported by the eaves frame through vibration-proof rubber.

  When a load is applied to the norikura, the anti-vibration rubber is compressed, and the nodule floor and the lower beam of the eaves frame approach each other. In conjunction with this, it is possible to know the loaded load based on the voltage change detected by the differential transformer. In addition, when a load is applied to the rider up to the maximum load, the limit switch is activated.

The elevator load detection device described in Patent Document 3 is provided in a rope hitch at the end of the main rope. This load detection apparatus includes a plate, a rod, a linear motion guide, and a displacement measuring device. Differences in the amount of displacement that occurs individually in the shackle rod depending on the position of the riding rod in the hoistway are averaged by receiving them with a plate mounted via a spring. In addition, by holding the rod attached to the plate with a linear motion guide, the shackle rod is also prevented from falling.
JP 2002-29676 A JP-A-8-245109 JP 2003-2549 A

  However, since the load detection devices described in Patent Document 1 and Patent Document 2 are disposed between the floor of the riding board and the lower beam of the fence frame, the elevator has a certain amount of space below the riding board. Necessary. Further, when the floor area of the riding rod is large, a detection error may occur depending on which position the load is applied to. Further, when the load is concentrated on the center portion of the floor, the entire floor is bent, and an error is likely to be included in the detection result.

  Furthermore, in the case of an elevator that is subjected to a large load at once, such as for cargo, a structure that does not have a vibration-proof rubber may be provided in order to ensure the rigidity of the eaves frame. In this case, the load detecting device cannot be installed between the riding board and the eaves frame because the floor of the riding board and the eaves frame are not displaced relatively.

  The load detection device described in Patent Document 3 calculates the load by averaging the difference in displacement generated at the end of the shackle rod due to the difference in tension applied to the plurality of main ropes, and measuring the average displacement. Is. Therefore, the displacement amount of the shackle rod caused by the position of the riding rod in the hoistway is also included in the displacement amount based on the load applied to the riding rod. As described above, if an error is included in the value measured as the average displacement amount by the mechanism provided to average the displacement amount of the end portion of each shackle rod, an error component when converted into a load. Becomes larger.

  Moreover, the load detection apparatus of patent document 3 is the structure which urges | biases the edge part of each shackle rod in the direction which loosens a main rope. The spring inserted into the end portion of the shackle rod needs to have a sufficient stroke to continue acting even when a displacement difference occurs in the end portion of the shackle rod due to the tension applied to the main rope. Therefore, the coil spring of the rope hitch requires an extra reaction force that opposes this urging force more than supporting the tension of the main rope.

  Therefore, the present invention provides a load detection device capable of accurately detecting a loaded load regardless of the form of riding, and an elevator including the load detection device.

  A load detection device according to the present invention is a load detection device provided in a rope hitch that holds ends of a plurality of main ropes that suspend an elevator ride on a hoistway, and includes a base plate, an elastic member, a target, and a distance measurement And a sensor. The base plate has an insertion hole through which the shackle rod is passed, and is arranged in parallel with the hitch plate on the side where the main rope extends with respect to the hitch plate. The elastic member is provided between the hitch plate and the base plate. The target is fixed to the hitch plate. The distance measuring sensor is arranged on the side where the base plate is fixed, and measures the position of the target along the direction in which the shackle rod extends.

  In this case, the target is formed of a magnetic material, and the distance measuring sensor employs a magnetic proximity sensor that detects the distance to the target by changing the inductance of a built-in detection coil. Alternatively, the distance measuring sensor employs an optical distance sensor that detects the reflected light of the light applied to the target and detects the distance to the target.

  Further, the elastic member employs synthetic rubber or a coil spring and is arranged at the end of the base plate. Alternatively, the elastic member employs a coil spring and is extrapolated to the shackle rod. In this case, a coil spring may be extrapolated to all of the shackle rods attached to each of the plurality of main ropes, or may be selectively extrapolated to several. The rope hitch provided with the load detection device is fixed inside the hoistway or fixed to the ride.

  Another aspect of the load detection device according to the present invention is a load detection device provided in a rope hitch that holds ends of a plurality of main ropes that suspend an elevator board from a hoistway. A distance sensor, a database, and a processing unit are provided. The target is fixed to one of the spring supports attached to the end of the shackle rod that is individually attached to the main rope. The distance measuring sensor is fixed to the hitch plate of the rope hitch and detects the position of the target. The database stores in advance signal values detected by the distance measuring sensor when the position of the riding board in the hoistway and the load placed on the riding board are changed. The processing unit calculates the load applied to the riding based on the position of the riding in the hoistway and the signal value stored in the database.

  In any of the load detection devices described above, the center of gravity of the arrangement of the shackle rods on the hitch plate and the center of gravity of the arrangement of the main ropes on the sheave on which the main rope extending from the shackle rod is first wound are aligned in the vertical direction. It is also preferable.

  The elevator according to the present invention includes a riding rod, a main rope, a hoisting machine, a rope hitch, a load detection device, and a control device. The riding board moves along a guide rail provided in the hoistway. The main rope is composed of a plurality of ropes and suspends the riding rod in the hoistway. In the hoisting machine, the main rope is wound around and drives the riding board. The rope hitch holds the end of the main rope. The load detection device employs any one of the load detection devices described above. The control device changes the driving condition of the hoisting machine based on the position of the riding in the hoistway and the output signal of the load detection device.

  The load detection device according to the present invention includes a target fixed to the hitch plate of the rope hitch and a distance measuring sensor fixed to the base plate side, and is based on the amount of displacement between the hitch plate and the base plate. Such a load is detected. Therefore, the load detection device can accurately detect the loaded load of the riding board regardless of the form of riding. The load detection device is provided in the rope hitch. Therefore, this load detection device can cope with either the case of roping in which the rope hitch is provided on the hoistway side or the case of roping in which the rope hitch is provided on the ride.

  Moreover, according to the elevator provided with the load detection device according to the present invention, the driving state of the hoisting machine is changed based on the position of the riding in the hoistway and the output signal of the load detection device. You can drive the norikura comfortably.

  An elevator 1 to which a load detection apparatus 10A according to a first embodiment of the present invention is applied will be described with reference to FIGS. The elevator 1 shown in FIG. 1 is an elevator in which a plurality of main ropes 2 are roped in a 2: 1 (two to one) form. The elevator 1 has a rod rail 4, a weight rail 5, a riding rod 6, a counterweight 7, a hoisting machine 8, and rope hitches 9 </ b> A and 9 </ b> B inside the hoistway 3.

  The eaves rail 4 and the weight rail 5 are provided in parallel as a pair, and are laid in the vertical direction. The riding rod 6 is guided by the rod rail 4, and the counterweight 7 is guided by the weight rail 5. The hoisting machine 8 and the rope hitches 9A and 9B are arranged in the upper part of the hoistway 3. The riding rod 6 has a rod sheave 61 at the bottom, and the counterweight 7 has a weight sheave 71 at the top. The hoisting machine 8 includes a main sheave 81 and a deflecting sheave 82. The main rope 2 is roped from the hook-side rope hitch 9 </ b> A to the rope-side rope hitch 9 </ b> B through the hook sheave 61, the main sheave 81, the deflecting sheave 82, and the weight sheave 71.

  2 shows the rope hitch 9A on the heel side and its periphery. The rope hitch 9B holds the ends of the plurality of main ropes 2 and is equipped with a load detection device 10A. The rope hitch 9 </ b> A includes a shackle rod 91, a hitch plate 92, a coil spring 93, a spring receiver 94, and a nut 95. The load detection device 10 </ b> A includes a base plate 11, an anti-vibration rubber 12, a target 13, and a distance measuring sensor 14.

  Sockets 21 are fastened to the ends of the plurality of main ropes 2 by an alloy. The shackle rod 91 is provided corresponding to each of the plurality of main ropes 2 and is connected to the main rope 2 via the socket 21. The tip of the shackle rod 91 is passed through an insertion hole 921 provided in the hitch plate 92. The coil spring 93 is externally inserted into an end portion of the shackle rod 91 that is passed through the insertion hole 921 of the hitch plate 92, and a nut 95 that is screwed to the tip of the shackle rod 91 in a state where the spring receiver 94 is applied. Retained.

  The insertion holes 921 of the hitch plate 92 are provided in two rows in a zigzag manner, so-called staggered arrangement, so that the intervals between adjacent ones are equal. In this case, as shown in FIG. 3, the center of gravity of the arrangement of the shackle rods 91 on the hitch plate 92 is the center of the main rope 2 in the sheave 61 for the saddle 6 on which the main rope 2 extending from the shackle rod 91 is first hung. It is preferable to arrange them so as to coincide with the vertical direction with respect to the center of gravity of the array. By arranging in this way, it is possible to minimize variations in tension applied to each of the plurality of main ropes 2 depending on the position of the riding rod 6 in the hoistway 3.

  The base plate 11 has an insertion hole 111 through which the shackle rod 91 is passed. The base plate 11 is fixed to a bracket 41 that is attached to the bag rail 4. The base plate 11 and the hitch plate 92 are arranged in parallel. The anti-vibration rubber 12 is an example of an elastic member, and is sandwiched between the hitch plate 92 and the base plate 11. As a specific example of the anti-vibration rubber 12, when a nitrile rubber which is a synthetic rubber is employed, it is inexpensive and easily available.

  The anti-vibration rubber 12 is disposed at each end of the base plate 11 which is the outer periphery of the arranged shackle rods 91, and is provided in two layers. Each anti-vibration rubber 12 has a plate 121 having rigidity on the upper and lower surfaces to be laminated. The anti-vibration rubber 12 is provided with a plurality of stages by attaching the plates 121 in the upper and lower directions as described above, and the strength against the buckling load is increased as compared with the continuous provision.

  The target 13 is made of a general structural steel plate, which is a magnetic material, and is fixed to the hitch plate 92. The tip 131 of the target 13 is provided in a direction parallel to the hitch plate 92. The distance measuring sensor 14 is a magnetic proximity sensor and is supported by a bracket 41 on the side to which the base plate 11 is fixed. The distance measuring sensor 14 measures the position of the target 13 along the direction in which the shackle rod 91 extends.

  Here, the magnetic proximity sensor employed as the distance measuring sensor 14 is a non-contact type sensor, and based on a change in inductance generated in a detection coil built in when the target 13 approaches or moves away from the target 13, Detect distance. Therefore, since the target 13 should just be a magnetic body, it is not limited to the product made from a general structural steel plate.

  Further, instead of using a magnetic proximity sensor as the distance measuring sensor 14, an optical distance sensor may be used. This optical distance sensor measures the distance to the target 13 by detecting the reflected light of the light irradiated on the target 13. Therefore, the target 13 in this case may be other than a magnetic material. In addition to these, as a distance measuring sensor, a strain gauge is attached to a plate that is curved and curved in an arc shape between the hitch plate 92 and the base plate 11 in addition to the ultrasonic distance measuring sensor, linear induct thin, and load cell. Etc. are also available.

  As described above, the load detecting device 10A provided on the rope hitch 9A includes the vibration isolating rubber 12 between the bracket 41 attached to the rail 4 and the rope hitch 9A. It is provided so as to receive the load applied to 9A. The load applied to the riding rod 6 is proportional to the amount of flatness of the anti-vibration rubber 12. Therefore, the load applied to the riding rod 6 can be accurately measured by measuring the flat amount of the vibration-proof rubber 12 by the distance measuring sensor 14. When the elastic coefficient of the anti-vibration rubber 12 changes according to the load, the load can be accurately detected by measuring the relationship between the load and the displacement amount in advance and using this as a calibration value.

  The elevator 1 is provided so that the center of gravity of the arrangement of the shackle rods 91 on the hitch plate 92 and the center of gravity of the array of the main ropes 2 on the rod sheave 61 of the riding rod 6 coincide with each other in the vertical direction. Therefore, when the riding rod 6 is at a certain position, the load is not biased to any one of the plurality of main ropes 2, and the anti-vibration rubber 12 is evenly flattened. That is, the detection reliability of the load detection device 10A is improved. Further, since the rope hitch 9A is uniformly displaced according to the load applied to the riding rod 6, the target 13 and the distance measuring sensor 14 may be attached to any direction around the rope hitch 9A.

  Further, as shown in FIG. 1, the elevator includes a control device 15 that changes a driving condition of the hoisting machine 8 using an output signal of the load detection device 10A. By optimizing the driving conditions for acceleration and deceleration according to the load applied to the riding board 6, the ride quality of the passenger can be improved. When the control device 15 uses the position information of the ride 6 in the hoistway 3 and the input information of the operation buttons in the ride 6 and landing buttons installed in each elevator hall, the riding comfort is further improved. Is also possible.

  Since this load detection device 10A detects the load applied to the riding rod 6, it is also easy to detect that the maximum loading load of the riding rod 6 has been exceeded without specially providing a limiter switch. be able to. In addition, when a load greater than the maximum load is detected, an alarm can be sounded or the conditions at that time can be recorded easily by adding those functions.

  A load detection device 10B according to a second embodiment of the present invention will be described with reference to FIG. In contrast to the load detecting device 10A of the first embodiment using the anti-vibration rubber 12 as an elastic member, the load detecting device 10B of this embodiment uses a coil spring 16 as an elastic member. The coil spring 16 is disposed at the end of the base plate 11 that is the outer periphery of the shackle rod 91 as in the case of the vibration isolating rubber 12 of the first embodiment. A guide rod 161 is attached to the center of the coil spring 16.

  The coil springs 16 may be arranged at the four corners of the hitch plate 92 so that the center of gravity of the arrangement of the shackle rods 91 on the hitch plate 92 can be easily maintained with the center of gravity of the arrangement of the main rope. Further, instead of providing the coil springs 16 at the four corners, the guide rods 161 may be replaced with those having a straight sliding performance such as a linear guide.

  Since the other configuration is the same as that of the load detection device 10A described in the first embodiment, the same reference numerals are given and description thereof is omitted. Moreover, since the whole structure as the elevator 1 is the same as 1st Embodiment, it shall refer to FIG. 1 and the description which concerns on FIG. 1 in 1st Embodiment.

  Thus, by adopting the coil spring 16 as an elastic member, the responsiveness to the change of the load applied to the riding rod 6 is improved, and the spring constant for setting the displacement amount with respect to the load is easily set. In addition, the load detection device 10B of the second embodiment can obtain the same effects as the load detection device 10A of the first embodiment.

  A load detection device 10C according to a third embodiment of the present invention will be described with reference to FIG. A load detection device 10C shown in FIG. 5 employs a coil spring 17 as an elastic member. The coil spring 17 is extrapolated to each of the shackle rods 91 provided corresponding to the plurality of main ropes 2 individually. If a sufficient reaction force can be obtained, the coil spring 17 need not be provided so as to be extrapolated to all the shackle rods 91 between the hitch plate 92 and the base plate 11. However, it arrange | positions so that the load received from rope hitch 9A may be applied equally.

  This embodiment has the same configuration when compared with the load detection device 10A of the first embodiment and the load detection device 10B of the second embodiment, except that the arrangement of the coil springs 17 serving as elastic members is different. Therefore, the same reference numerals are given and the description thereof is omitted. Moreover, the whole structure as an elevator shall refer to FIG. 1 and the description concerning FIG. 1 in the first embodiment.

  The load detection device 10 </ b> C configured as described above has the same effect as the load detection device 10 </ b> A of the first embodiment and the load detection device 10 </ b> B of the second embodiment, and the coil spring 17 is connected to the shackle rod 91. Therefore, the overall size of the device is compactly collected.

  A load detection device 10D according to a fourth embodiment of the present invention will be described with reference to FIG. A load detection apparatus 10D shown in FIG. 6 includes a target 13, a distance measuring sensor 14, a database 18, and a processing unit 19. The target 13 is fixed to a spring receiver 94 attached to the end of one shackle rod 91. The tip 131 of the target 13 is provided in a direction parallel to the hitch plate 92. The target 13 is made by bending a general structural steel plate which is an example of a magnetic body.

  The distance measuring sensor 14 employs a magnetic proximity sensor that is a non-contact sensor. In addition, as long as the method does not affect the movement of the shackle rod 91, a sensor such as an ultrasonic distance sensor, an optical distance sensor, or a linear inductor can be used instead of the magnetic proximity sensor. It is.

  The database 18 stores signal values detected by the distance measuring sensor 14 when the position of the riding rod 6 in the hoistway 3 and the load placed on the riding rod 6 are changed. Instead of storing the signal value, an approximate expression based on a plurality of actually measured values may be stored. The processing unit 19 converts the signal value obtained from the distance measuring sensor 14 into a load applied to the riding rod 6 based on the position of the riding rod 6 in the hoistway 3 and the signal value stored in the database 18. To do.

  The load detection device 10 </ b> D of the present embodiment calculates a load applied to the riding rod 6 based on the tension applied to any one of the plurality of main ropes 2. In this case, the load detection device 10D of the present embodiment is detected by the distance measuring sensor 14 when the position of the riding rod 6 and the load applied to the riding rod 6 are changed with respect to this specific one main rope 2. A database 18 for recording the signal value is stored, and the value actually measured by the distance measuring sensor 14 is collated with the database 18 by the processing unit 19 to calculate the load applied to the rider 6.

  The carriage 6 repeatedly moves up and down in the hoistway 3 in the same manner and has good reproducibility. In other words, even when the load applied to the rider 6 and the signal value detected by the distance measuring sensor 14 are not directly proportional, or even when a specific detection result is obtained under a specific condition, it is repeatedly reproduced. The Therefore, the load detection device 10D can accurately measure the load applied to the riding rod 6 by correcting the detection value of the distance measuring sensor 14 based on the database 18.

  In order to improve the measurement accuracy of the load detection device 10D, a plurality of sets of targets 13 and distance measuring sensors 14 may be attached to the main rope 2 individually.

  In any of the embodiments, the distance measuring sensor 14 is arranged to be separated from the target 13 when a load is applied to the riding rod 6. The displacement amount of the target 13 detected by the distance measuring sensor 14 may be reversed along the direction in which the shackle rod 91 extends depending on whether the load is applied to the ride rod 6 or the load is removed. When a load is applied, the target 13 may be arranged to approach toward the distance measuring sensor 14.

  If the target 13 is arranged so as to approach the distance measuring sensor 14 as the load applied to the riding rod 6 increases, depending on the form of the distance measuring sensor 14 to be applied, the detection signal may be increased as the load increases. Can also be set to increase.

The front view which shows typically an elevator provided with the load detection apparatus of 1st Embodiment which concerns on this invention. FIG. 3 is a side view of the heel side rope hitch and load detection device shown in FIG. The top view which shows typically the positional relationship of the perpendicular direction of the rope hitch shown in FIG. The side view which shows a rope hitch provided with the load detection apparatus of 2nd Embodiment which concerns on this invention, and its periphery partly notched. The side view which shows the rope hitch provided with the load detection apparatus of 3rd Embodiment based on this invention, and its periphery partly notched. The side view which shows a rope hitch provided with the load detection apparatus of 4th Embodiment which concerns on this invention, and its periphery partly notched.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Elevator, 2 ... Main rope, 3 ... Hoistway, 6 ... Riding, 8 ... Hoisting machine, 9A, 9B ... Rope hitch, 10A, 10B, 10C, 10D ... Load detection device, 11 ... Base plate, 12 ... Anti-vibration rubber (elastic member (synthetic rubber)), 13 ... target, 14 ... distance measuring sensor, 15 ... control device, 16, 17 ... coil spring (elastic member), 18 ... database, 19 ... processing unit, 91 ... shackle rod 92 ... Hitch plate, 93 ... Coil spring, 94 ... Spring support, 111 ... Insertion hole.

Claims (11)

A load detection device provided in a rope hitch that holds end portions of a plurality of main ropes that suspend an elevator ride on a hoistway,
A base plate that has an insertion hole through which a shackle rod passes and is arranged in parallel to the hitch plate on the side where the main rope extends with respect to the hitch plate;
An elastic member provided between the hitch plate and the base plate;
A target fixed to the hitch plate;
A distance measuring sensor disposed on a side to which the base plate is fixed and measuring a position of the target along a direction in which the shackle rod extends;
A load detection device comprising: The target is formed of a magnetic material,
The load sensor according to claim 1, wherein the distance measuring sensor is a magnetic proximity sensor that detects a distance to the target by a change in inductance of a built-in detection coil.   The load detection device according to claim 1, wherein the distance measuring sensor is an optical distance sensor that detects reflected light of light irradiated on the target and detects a distance to the target.   The load detection device according to claim 1, wherein the elastic member is a synthetic rubber disposed at an end portion of the base plate.   The load detection device according to claim 1, wherein the elastic member is a coil spring disposed at an end portion of the base plate.   The load detection device according to claim 1, wherein the elastic member is a coil spring that is extrapolated to the shackle rod.   The load detection device according to claim 1, wherein the rope hitch is fixed inside the hoistway.   The load detecting device according to claim 1, wherein the rope hitch is fixed to the riding rod. A load detection device provided in a rope hitch that holds end portions of a plurality of main ropes that suspend an elevator ride on a hoistway,
A target fixed to one of the spring supports attached to the ends of the shackle rods individually attached to the main rope;
A ranging sensor fixed to the hitch plate of the rope hitch to detect the position of the target;
A database for storing signal values detected by the distance measuring sensor when the position of the riding rod in the hoistway and the load placed on the riding rod are each changed;
A load detection device comprising: a processing unit that calculates a load applied to the riding board based on the position of the riding board in the hoistway and the signal value stored in the database. .   The center of gravity of the arrangement of the shackle rods on the hitch plate and the center of gravity of the arrangement of the main ropes on a sheave around which the main rope extending from the shackle rod is first wound coincide with each other in the vertical direction. Item 10. The load detection device according to any one of Items 1 to 9. Norikura moving along guide rails provided in the hoistway;
A plurality of main ropes for suspending the riding board in the hoistway;
A hoisting machine on which the main rope is wound to drive the riding board;
A rope hitch that holds the end of the main rope;
The load detection device according to any one of claims 1 to 10, provided on the rope hitch,
An elevator comprising: a control device that changes a driving condition of the hoisting machine based on a position of the riding in the hoistway and an output signal of the load detection device.

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