JP2000355475A - Main cable pull stop device of elevator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the main cable pull stop device of an elevator in which a looseness detector is not mis-operated by the car load change estimated at the usual operation time. SOLUTION: A cable stop spring is stretched by the generation of the looseness of a main cable and pull stop device is lowered abnormaly and an operation plate 16 is also lowered. A looseness detector 37 is operated by the enlargement and transmission of the stretch amount of the cable stop spring by an enlargement transmission mechanism 28 following to the lowering of the operation plate 16. Therefore, the characteristic of the cable stop spring can be set easily so that the looseness detector 37 is not operated by the extension/ contraction of the cable stop spring by the car load change estimated at the usual operation time and operated surely by the abnormality such as the looseness of the main cable. Thereby, the mis-operation of the looseness detector 37 is reduced and the operation of the elevator by a high reliability is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main index stopping device for an elevator in which a plurality of main ropes are arranged in parallel and each is connected to a support.

[0002]

2. Description of the Related Art FIG.
FIG. 5 is a front view of a main part of an elevator car showing a conventional main index stopping device of an elevator shown in Japanese Unexamined Patent Application Publication No. HEI 9-125, and FIG. In the drawing, reference numeral 1 denotes a support having an upper beam of a car frame of an elevator car (not shown) and having a hat-shaped steel cross section.

[0003] Reference numeral 2 denotes a detent, which has a main rope 4 connected to one end of a detent rod 3 inserted through the support 1, and a detent rod 3.
Is fitted to the insertion end side of the
A nut 7 is screwed into the insertion end of the retaining rod 3 to hold the nut through a washer 6.

[0004] Reference numeral 8 denotes a bracket that stands upright from the upper surface of the support 1 and is disposed close to the length of the retaining bar 3. The operation plate 10 arranged in the position is a looseness detector composed of a micro switch, and is fastened to the bracket 8, and the operation portion is arranged to face the operation plate 9.

[0005] The conventional main index locking device of the elevator is constructed as described above, and the retaining member 2 is held on the support 1 via the retaining spring 5. As a result, the elevator car is suspended by the main cable 4 connected to the detent device 2. When the main rope 4 is abnormally elongated or loosened, the cleat spring 5 is extended. As a result, the stopper 2 is abnormally lowered, and the operating plate 9 is also lowered. Then, the corresponding slack detector 10 is operated by being pressed by the lowered operating plate 9, and the elevator is controlled in an abnormal state through the operation of the slack detector 10.

[0006]

SUMMARY OF THE INVENTION In the conventional elevator main index stop device as described above, passengers get on and off between cars and landings at normal times, dynamic load changes at the time of car acceleration and deceleration, and The load fluctuates due to, for example, a passenger jumping up mischief within the vehicle. The characteristics of the cleat spring 5 are set so that the slack detector 10 does not operate due to the expansion and contraction of the cleat spring 5 due to these load fluctuations, and the slack detector 10 operates reliably due to an abnormality such as the slack of the main rope 4. Need to be set. For this reason, if the spring constant of the cleat spring 5 is set to a small value, the loosening of the main rope 4 can be reliably detected.
There has been a problem that erroneous detection of the operation of the looseness detector 10 occurs due to a change in the load of the car predicted during normal operation.

[0007] If the spring constant of the cleat spring 5 is reduced, the amount of sinking of the car at the time of passenger getting on and off increases. For this reason, it is necessary to keep the sinking amount of the car within a predetermined value, which limits the reduction of the spring constant of the cleat spring 5. Further, in an elevator having a large load capacity and a heavy car weight, the number of main ropes 4 is generally large. Accordingly, since the spring constant of the cleat spring 5 increases, the amount of deflection of the cleat spring 5 decreases. When the amount of bending of the rope retaining spring 5 decreases, the displacement from the amount of bending in a normal state to the amount of bending in a state of loose rope becomes very small, and detection becomes impossible. In addition, since the displacement is very small, the displacement required to absorb the setting error of the slack detector cannot be secured, and the error of detection that the rope is detected as loose even in a normal state due to the setting error increases. .

Although not shown in the drawing, in the case of a winding drum type elevator in which a counterweight is provided to reduce the size of the hoisting machine, the load caused by the car is small, so that the deflection of the cleat spring 5 during normal operation is reduced. Since the amount is small, false detection of the looseness detector 10 increases. In general, since a plurality of main ropes 4 are provided, in the case of a device configuration in which a slack detector 10 is provided for each main rope 4, the slack detector 10 for each main rope 4 is provided.
In order to secure the installation space, the degree of freedom of design is impaired.

The plurality of main ropes 4 are adjusted so that the loads acting at the beginning of installation are balanced. However, since the amount of elongation of each main rope 4 differs due to aging, the looseness detector 10 of the main rope 4 having large elongation may operate even if there is no looseness, and erroneous detection may occur.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a main index stop device for an elevator in which a slack detector does not malfunction due to a change in the load of a car predicted during normal operation. I do.

[0011]

In the elevator weighing apparatus according to the present invention, a main rope is connected to one end of a retaining rod inserted into the supporting member, and the retaining rod is held on the supporting member via a retaining spring. A plurality of detents arranged in parallel at a distance from each other on the support, and engaged with the respective detent rods and supported at a predetermined position in the longitudinal direction of the detent rod, and the longitudinal direction of at least one detent rod An operation plate that is displaced in a direction along the length of the retaining rod from a predetermined position by displacement, a slack detector provided on the support,
There is provided a transmission means connected on one side to the operation plate, and an enlarged transmission mechanism connected to the other side of the transmission means for expanding the displacement of the operation plate and transmitting the displacement to the slack detector.

Further, in the elevator weighing apparatus according to the present invention, a load detector is provided on the support and connected to the transmitting means, and generates an output corresponding to the displacement of the transmitting means.

Further, in the elevator weighing device according to the present invention, there is provided an enlarged transmission mechanism constituted by a rope wrapping mechanism for extending the longitudinal displacement of the retaining rod through a pulley and a transmission cable.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 1 to 3 are views showing an example of an embodiment of the present invention. FIG. 1 is a perspective view conceptually showing an elevator car, and FIG. 2 is a longitudinal section of a main part of a support body in FIG. FIG. 3 is an enlarged view and FIG. 3 is a plan view of FIG. In the figure, reference numeral 1 denotes a support having an upper beam of a car frame 12 constituting a car 11 of an elevator and having a hat-shaped steel cross section.

Reference numeral 2 denotes a stopper which is arranged at each corner of the triangle in three planes. A main rope 4 is connected to one end of a stopper rod 3 inserted into the support 1, and the insertion end of the stopper rod 3 is inserted. A retaining spring 5 is fitted on the side, and a nut 7 for holding the retaining spring 5 via a washer 6 is screwed into the insertion end of the retaining rod 3.

Reference numeral 13 denotes a support tube which is fitted to the retaining rod 3 to form a gap in the support 1 and has a lower end arranged in contact with the upper surface of the washer 6 and a spherical seat 14 at the upper end. It is installed. Reference numeral 15 denotes a guide bar, which is provided upright from the upper surface of the support 1 and is provided corresponding to each of the retaining bars 3.

Reference numeral 16 denotes an operation plate, in which the retaining rod 3 and the guide rod 15 are fitted to each other while forming a gap, and the spherical seat 14 is provided.
Is disposed on and in contact with a washer 141. 17
Is a lower pressing spring, which is disposed on each of the guide rods 15, is fitted to the guide rods 15, and is disposed between the upper surface of the support 1 and the lower surface of the operation plate 16.

Numeral 18 denotes an upper pressing spring, which is disposed on each of the guide rods 15, is fitted on the guide rods 15, is disposed on the upper surface of the operation plate 16, and has an upper end screwed into the upper end of the guide rod 15. As a result, the operating plate 16 is pressed against the spherical seat 14 against the pushing-up force of the lower pressing spring 17. Reference numeral 21 denotes a load detector provided on the support 1 and is constituted by a differential transformer having a differential body 22.

Reference numeral 23 denotes a support 1 caused by the expansion and contraction of the clasp spring 5.
A transmission means for transmitting the displacement of the stopper 2 to the load detector 21, the pulley 24 being pivotally attached to the support 1 and disposed opposite the differential body 22, and the three retaining rods 3 in the operation plate 16 A screw rod 25 inserted in the center between the nuts, nuts 26 screwed into the screw rod 25 and arranged on the upper and lower surfaces of the operation plate 16 respectively, and one end connected to the lower end of the screw rod 25, wound around the pulley 24 and the other end Is constituted by a rope 27 connected to the differential body 22.

Reference numeral 28 denotes an enlarged transmission mechanism, which is provided upright from a pivot plate 29 fixed to the end of the differential body 22 on the side opposite to the pulley 24, a pulley 30 pivotally supported by the pivot plate 29, and the support 1. Pulley 30
, One end of which is connected to one side of the mounting plate 31 and is wound around the pulley 30, and the other end of which is a transmission cable 32 and a transmission cable 32 which are disposed on the other side of the mounting plate 31. Are connected to each other to form a gap in the mounting plate 31, and are fitted to the bucking rod 33, and are fitted to the bucking rod 33 so that one end is in contact with the mounting plate 31 and the other end is the insertion end of the bucking rod 33. A compression coil spring 36 is held by a nut 34 screwed through a washer 35 via a washer 35.

That is, the expansion transmission mechanism 28 is constituted by a rope wrapping mechanism that expands the operation through the pulley 30 and the transmission cable 32. Reference numeral 37 denotes a looseness detector comprising a microswitch provided on the support 1, and the operating portion is disposed at a position where the operating portion is opposed to the insertion end of the cleat bar 33 in a normal state with a gap formed therebetween.

In the main index locking device for an elevator constructed as described above, a plurality of detent tools 2 are held on the support 1 via the retaining springs 5 respectively. As a result, the car 11 is suspended by the main rope 4 connected to the stopper 2. Then, the operation plate 16 is arranged in contact with the spherical seat 14 of the support tube 13 supported by the washer 6 holding the tie spring 5.

The transmission means 2 connected to the operating plate 16
3 is substantially connected to the expansion transmission mechanism 28 via the differential body 22 of the load detector 21 and is pulled by the compression coil spring 36 of the expansion transmission mechanism 28. Then, for example, when the load in the car 11 increases, the bending of the cleat spring 5 increases, and the retaining rod 3 is displaced upward with respect to the support 1.

As a result, the operation plate 16 is raised via the spherical seat 14 of the support tube 13 and the rope 27 connected to the screw rod 25 is pulled up. Therefore, the differential body 22 is displaced forward from the load detector 21, and the load in the car 11 is detected steplessly, and the detected value controls the elevator according to the load in the car room 11.

When the main rope 4 is abnormally elongated or loosened, the cleat spring 5 is extended. As a result, the stopper 2 abnormally descends, and the operating plate 16 supported by the spherical seat 14 of the support tube 13 also descends. When the operation plate 16 is lowered, the rope stopping rod 33 protrudes from the mounting plate 31 by the tensile action of the compression coil spring 36 of the enlarged transmission mechanism 28.

The slack detector 37 operates by the protrusion of the rope stopper bar 33. Through the operation of the slack detector 37, the elevator is controlled when it is abnormal. The amount of protrusion of the cleat bar 33 when the rope retaining spring 5 is abnormally extended is increased by the enlarged transmission mechanism 28, that is, the rope wrapping mechanism by the 2: 1 roping in which the pulley 30 and the transmission cable 32 are arranged.
The amount of operation due to the expansion and contraction of the rope retaining spring 5 is doubled and transmitted to the cleat bar 33.

In normal times, load fluctuations occur due to passengers getting on and off between the car 11 and the landing, dynamic load changes at the time of acceleration and deceleration of the car 11, and passengers jumping up in the car 11 by mischief. . The amount of deflection of the cleat spring 5 due to the load fluctuation of the car predicted during normal operation is as follows.
It is enlarged and transmitted twice.

However, the displacement of the slack detector 37 necessary for detecting the slack of the main rope 4 does not change. For this reason,
Since the amount of deflection of the cleat spring 5 for detecting the looseness of the main rope 4 is substantially doubled, the looseness detector 37
Operating accuracy is increased. Therefore, even if the spring constant of the cleat spring 5 is set to a small value, the looseness of the main rope 4 can be reliably detected, and erroneous detection in which the looseness detector 37 operates due to a predicted car load change during normal operation is generated. Can be prevented.

That is, the slack detector 37 does not operate due to the expansion and contraction of the cleat spring 5 due to a change in the load of the car which is predicted during normal operation such as when the passenger gets on and off between the car and the landing. In this case, the characteristics of the cleat spring 5 can be easily set so that the looseness detector 37 operates reliably due to the abnormality. Therefore, it is possible to obtain a main index stopping device for an elevator, which can reduce the malfunction of the slackness detector 37 and can operate the elevator with high reliability.

In the embodiment shown in FIGS. 1 to 3,
Since the load detector 21 that operates by being connected to the transmission means 23 is provided, the load detection function in the car 11 and the abnormality detection function of the main rope 4 can be easily arranged in a small space, and the design freedom especially in the small car 11 is free. The degree can be improved.

It is to be noted that the enlarged transmission mechanism 28 can be easily configured by applying the embodiment of FIGS. 1 to 3 as described below, and the same operation as that of the embodiment of FIGS. Obtainable. That is, a pulley is added to the enlarged transmission mechanism 28 to easily provide a 3: 1 roping winding mechanism, 4:
It can be a one-roping winding mechanism. Further, it is also possible to configure the expansion transmission mechanism 28 with a link mechanism, a gear mechanism, or the like to increase the amount of deflection of the cleat spring 5.

[0032]

As described above, according to the present invention, the main rope is connected to one end of the detent rod inserted into the support, the detent rod is held on the support via a retaining spring, and A plurality of detents arranged in parallel at a distance,
An operating plate engaged with each of the retaining bars and supported at a predetermined position in the longitudinal direction of the retaining bars, and displaced in a direction along the longitudinal direction of the retaining bars from the predetermined position by the longitudinal displacement of at least one retaining rod; A looseness detector provided on the body, a transmission means connected to the operation plate on one side, and an enlarged transmission mechanism connected to the other side of the transmission means for expanding the displacement of the operation plate and transmitting the displacement to the looseness detector; Is provided.

Thus, when the main rope is abnormally elongated or loosened, the retaining spring is extended, the retaining member is abnormally lowered, and the operating plate is also lowered. Then, the slack detector operates via the operation of the expansion transmission mechanism due to the lowering of the operation plate. That is, the slack detector operates due to the abnormal lowering of the detent device due to the slack of the main rope or the like, that is, the amount of extension of the cleat spring is expanded and transmitted by the expansion transmission mechanism. As a result, the slack detector does not operate due to the expansion and contraction of the cleat spring due to the load fluctuation of the car predicted during normal operation,
The characteristics of the cleat spring can be easily set so that the slack detector operates reliably due to an abnormality such as slack of the main rope. Therefore, there is an effect that the malfunction of the slack detector is reduced and the operation of the elevator with high reliability is realized.

Further, as described above, the present invention is provided with a load detector which is provided on the support and is connected to the transmitting means, and which generates an output corresponding to the displacement of the transmitting means.

Thus, when the main rope is abnormally elongated or loosened, the rope retaining spring is extended, the retaining member is abnormally lowered, and the operating plate is also lowered. Then, the slack detector operates via the operation of the expansion transmission mechanism due to the lowering of the operation plate. That is, the slack detector operates due to the abnormal lowering of the detent device due to the slack of the main rope or the like, that is, the amount of extension of the cleat spring is expanded and transmitted by the expansion transmission mechanism. This allows the slack detector not to operate due to the expansion and contraction of the rope retaining spring due to fluctuations in the car load predicted during normal operation, and the rope detector to operate reliably due to an abnormality such as loose main ropes. The characteristics of the stop spring can be easily set. Therefore, there is an effect that the malfunction of the slack detector is reduced and the operation of the elevator with high reliability is realized. Further, since the load detector connected to the transmission means is provided, the load detection function in the car and the abnormality detection function of the main rope can be easily arranged in a small space, and the effect of improving the design flexibility in a small car or the like can be improved. There is.

Further, as described above, the present invention is provided with an enlarged transmission mechanism constituted by a rope wrapping mechanism for extending the longitudinal displacement of the retaining rod via a pulley and a transmission cable.

As a result, when the main rope is abnormally elongated, loosened, or the like, the rope retaining spring is extended, the retaining member is abnormally lowered, and the operating plate is also lowered. Then, the slack detector operates via the operation of the expansion transmission mechanism due to the lowering of the operation plate. That is, the locking device is abnormally lowered due to the loosening of the main rope, that is, the expansion amount of the cleat spring is expanded and transmitted by the expansion transmission mechanism configured by the rope wrapping mechanism in which the pulley and the transmission cable are arranged, and the loosening is performed. The detector operates. This allows the slack detector not to operate due to the expansion and contraction of the rope retaining spring due to fluctuations in the car load predicted during normal operation, and the rope detector to operate reliably due to an abnormality such as loose main ropes. The characteristics of the stop spring can be easily set. Therefore, there is an effect that the malfunction of the slack detector is reduced and the operation of the elevator with high reliability is realized.

[Brief description of the drawings]

FIG. 1 shows the first embodiment of the present invention, and is a perspective view conceptually showing an elevator car.

FIG. 2 is an enlarged view of a main part of a support body in FIG.

FIG. 3 is a plan view of FIG. 2;

FIG. 4 is a front view of a main part of an elevator car showing a conventional main index stopping device of the elevator.

FIG. 5 is a side view of FIG. 4;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 support, 2 detent, 3 detent rod, 4 main rope, 5 rope retaining spring, 16 operating plate, 21 load detector, 23 transmission means, 28 enlarged transmission mechanism, 30 pulley,
32 Transmission cable, 37 Loose detector.

Claims (3)

[Claims] 1. A main rope is connected to one end of a detent rod inserted through a support, the detent rod is held on the support via a rope spring, and the detent rod is spaced apart from and parallel to the support. And a plurality of detent tools, which are engaged with the respective detent rods and are supported at predetermined positions in the longitudinal direction of the detent rods, and are moved from the predetermined position to the longitudinal direction by a longitudinal displacement of at least one detent rod. An actuating plate displaced in the direction along, a slack detector provided on the support, a transmitting means connected to the operating plate on one side, and a displacement of the operating plate connected to the other side of the transmitting means. A main index detent device for an elevator, comprising: an enlarged transmission mechanism that is enlarged and transmitted to the looseness detector. 2. The main rope of an elevator according to claim 1, further comprising a load detector provided on the support and connected to the transmitting means, and generating a load according to the displacement of the transmitting means. Detent device. 3. The expansion transmission mechanism according to claim 1, wherein the expansion transmission mechanism is constituted by a rope wrapping mechanism that expands the longitudinal displacement of the retaining rod via a pulley and a transmission cable. 3. The main index stopping device for an elevator according to 1.