JP5173281B2 - elevator - Google Patents

Description

  The present invention relates to an elevator capable of easily adjusting the length of a wire rope.

  Generally, in a wire rope traction type elevator, a car and a counterweight are coupled to the wire rope, so that the wire rope is tensioned and stretched. Further, the amount of elongation increases with time.

  On the other hand, the car and the counterweight travel in the hoistway within the range of the lifting process, but when a failure or the like occurs, it moves beyond the normal lifting process. In preparation for such a failure, a shock absorber is installed below the car and the counterweight in the hoistway. A prescribed clearance is secured between the car and the counterweight and the shock absorber so that they do not come into contact with each other in a normal lifting process. However, when the wire rope is stretched as described above, the clearance between the counterweight and the shock absorber is reduced, and the prescribed clearance cannot be secured.

  When the wire rope is stretched and the clearance is reduced, it is necessary to cut off the stretched portion of the wire rope in order to secure the clearance. Usually, this truncation work must stop the elevator operation until the work is completed, which causes inconvenience to the elevator user. For workers, for example, work is often performed on an unstable car under the feet, and workability is poor.

Therefore, for example, a contact position directly above a shock absorber provided below the counterweight (hereinafter referred to as “balance weight shock absorber”) and a non-proponent that deviates from a region immediately above the counterweight buffer. An elevator main rope elongation compensator has been proposed that includes a movable spacer that can move between contact positions and an extension that is mounted below the counterweight (see Patent Document 1). According to this proposal, when the clearance between the extension portion and the shock absorber is reduced, the reduced clearance is reduced by moving the movable spacer from the contact position to the non-contact position according to the reduction width. We are going to compensate.
JP 2005-521610 A

  However, according to the invention disclosed in Patent Document 1, the clearance is compensated by moving the movable spacer. However, by mounting the extension portion below the counterweight, it is originally between the counterweight and the shock absorber. The clearance will decrease. Moreover, it is necessary to provide an extension part at the lower part of the counterweight. Depending on the shape of the extension part, the shape of the counterweight may be restricted.

  SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to reduce the number of truncation operations in an operation for stretching the wire rope, improve work efficiency even when performing the operation, and It is possible to provide an elevator capable of ensuring a prescribed clearance simply and safely in consideration of the work safety.

A first feature according to an embodiment of the present invention is that, in an elevator, a car that moves up and down in a hoistway, a car sheave mounting beam provided at a lower part of the car and connected to the car, and a car sheave mounting A car sheave attached to the beam and over which a wire rope is stretched, a hoisting machine that moves the wire rope up and down to raise and lower the car, and a counterweight connected to the wire rope hanging on the hoisting machine, The car sheave mounting beam provided at the lower part of the car and the car is connected by a movable device that can change the distance between the two in a predetermined direction.

  According to the present invention, in the work for the elongation of the wire rope, the number of truncation operations is reduced, and the clearance defined in a simple and safe manner in consideration of the improvement of the work efficiency and the work safety of the worker when performing the work. Can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is an overall view showing the configuration of an elevator 1, particularly a wire rope traction type elevator. In this elevator 1, a wire rope 2 connected at both ends to rope hitches RH provided at two places is wound around a sheave connected to a car 3 on which people, luggage, etc. ride and a counterweight 4. ing. Further, the wire rope 2 between the car 3 and the counterweight 4 is wound around the traction sheave 5a of the hoisting machine 5, and the hoisting machine 5 winds the wire rope 2 up and down to move it up and down. A car 3 and a counterweight 4 move up and down in the road 6.

  In the embodiment of the present invention, the shock absorbers 7a and 7b are provided directly below the car 3, and the shock absorber 7c is provided directly below the counterweight 4 as shock absorbers for reducing the impact when dropped. It has been.

  A sheave mounting beam 3a to which a car sheave 3b is mounted is connected to the lower portion of the car 3. A wire rope 2 is stretched over the car sheave 3b. Therefore, for example, when the hoist 5 winds the wire rope 2, the car sheaves 3 b and 3 b (hereinafter collectively referred to as “car sheave 3 b”) rotate to raise the car 3.

  In the first embodiment of the present invention, the car 3 and the sheave mounting beam 3a provided at the lower part of the car 3 are movable devices 8 and 8 (hereinafter referred to as “movable device 8” as appropriate. ").

  This movable device 8 connects between the car 3 and the sheave mounting beam 3a. The distance between the car 3 and the car sheave 3b attached to the sheave attachment beam 3a can be changed by the movable device 8 in a predetermined direction, for example, the vertical direction. The movable device 8 is a jack in the embodiment of the present invention. For example, the movable device 8 may be a mechanical screw jack (pantograph type, ball screw type, ratchet type, etc.), a rack drive jack, or a liquid actuated type. It may be a hydraulic jack that is a jack. In describing the embodiment of the present invention, an example using a pantograph jack is given.

  Further, in changing the distance between the car 3 and the sheave mounting beam 3a (the car sheave 3b), even if the installed jack is manually moved, it is of an electric type. It doesn't matter. In the case of the electric type, the power for driving the jack may be supplied from the control panel of the elevator 1 or may be directly connected to the jack to supply power.

  The counterweight 4 is suspended from the wire rope 2 via the counterweight sheave 4a, and moves in the hoistway 6 in the opposite direction to the car 3. Further, when the car 3 is moved up to the top floor, the distance between the lower surface of the counterweight 4 and the shock absorber 7c (hereinafter simply referred to as “clearance C”) is determined by laws and regulations and the elevator 1 installer. The necessary clearance C is secured by regulations.

  By the way, the position of the car 3 is corrected at any time in relation to the platform on each floor. Therefore, even if the wire rope 2 extends, the length of the wire rope 2 from one rope hitch RH on the side of the car 3 to the car sheave 3b and the hoisting machine 5 is always kept substantially constant. Accordingly, the elongation of the wire rope 2 appears in the length of the wire rope 2 of the counterweight sheave 4a from the hoisting machine 5 and the other rope hitch RH. From this, when the wire rope 2 is extended, the counterweight 4 is lowered from the normal position, and the clearance C is reduced. If such a state is left as it is, the prescribed clearance C cannot be secured, and it is necessary to perform a cutting operation in order to avoid contact between the counterweight 4 and the shock absorber 7c.

  Therefore, in the first embodiment of the present invention, the distance between the car 3 and the car sheave 3b is extended using the movable device 8 in the vertical direction. That is, as shown in the overall view of the elevator 1 in FIG. 2, the height of the pantograph jack is increased, and the distance between the car 3 and the car sheave 3 b is adjusted according to the amount of extension of the wire rope 2.

  As described above, the position of the car 3 is corrected in relation to the landing on each floor. Accordingly, the fact that the distance between the car 3 and the car sheave 3b increases in the vertical direction means that the car sheave 3b is separated from the car 3 with the position of the car 3 as a reference. By moving the sheave mounting beam 3a in this way and changing the position of the car sheave 3b, the length of the wire rope 2 from one rope hitch RH on the car 3 side to the car sheave 3b and the hoisting machine 5 is wired. It can be made longer than the length at the same location when the rope 2 is not stretched. That is, by absorbing the amount of elongation of the wire rope 2 at this location, the counterweight 4 can be prevented from falling below the normal position, and thus the clearance C can be secured.

  FIGS. 3 and 4 are enlarged views of portions of the car 3, the sheave mounting beam 3a, and the movable device 8 (in circles indicated by broken lines) in FIGS. FIG. 3 is a diagram illustrating a state of the movable device 8 in a state where the elevator 1 is just installed and the wire rope 2 is not stretched, and corresponds to FIG. 1. In this case, the wire rope 2 is not stretched, and therefore the clearance C between the counterweight 4 and the shock absorber 7c is secured to a specified amount. Therefore, the movable device 8 is moved to move the car 3 and the car sheave 3b ( There is no need to increase the distance between the sheave mounting beam 3a).

  On the other hand, as shown in FIG. 4, when the wire rope 2 is stretched, the movable device 8 is used between the car 3 and the car sheave 3b (the sheave mounting beam 3a) according to the stretch amount. Increase the distance. In FIG. 4, since the pantograph type screw jack which is the movable device 8 is a type which is moved manually, a handle 8a is attached.

  In this way, by allowing the car sheave to move in a predetermined direction, it is only necessary to adjust the vertical distance between the car cage and the car sheave using the movable device according to the amount of elongation of the wire rope. Because it can absorb the amount of wire rope stretch, it reduces the number of truncation operations, improves work efficiency when working and considers the work safety of workers in a simple and safe manner, with a balanced weight and buffer. It is possible to provide an elevator that can ensure a prescribed clearance with the machine.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the second embodiment, the same components as those described in the first embodiment are denoted by the same reference numerals, and the description of the same components is omitted because it is duplicated.

  In the second embodiment of the present invention, unlike the elevator 1 in the first embodiment, as shown in FIGS. 5 and 6, a sheave mounting beam 3 a and a car sheave 3 b are provided on the upper portion of the car 3. It is provided.

  In the second embodiment, the distance between the car 3 and the car sheave 3b is widened in advance, and this state is set to a normal state. When the wire rope 2 is stretched under such a condition, the stretch amount affects the clearance C between the counterweight 4 and the shock absorber 7c as in the first embodiment described above (the clearance decreases). To do).

  Therefore, when elongation occurs in the wire rope 2, the distance between the car 3 and the car sheave 3 b is shortened using the movable device 8. That is, even if the wire rope 2 extends, the position of the car 3 does not change greatly in relation to the landing on each floor. Therefore, by retracting the movable device 8 in accordance with the amount of elongation of the wire rope 2 and bringing the car sheave 3b closer to the car 3, the one from the rope hitch RH on the car 3 side to the car sheave 3b and the hoist 5 The length of the wire rope 2 can be made longer than the length at the same location when the wire rope 2 is not stretched.

  3 and 4 used in the description of the first embodiment, in the second embodiment, it is normal that the movable device 8 is in a state as shown in FIG. That is, the wire rope 2 is not stretched. On the other hand, the reason why the movable device 8 is contracted as compared with the case shown in FIG. 4 as shown in FIG. 3 is that the wire rope 2 is stretched, and the movable device 8 is moved in accordance with the stretch amount.

  In this way, by allowing the car sheave to move in the vertical direction, it is only necessary to adjust the vertical distance between the car and the sheave mounting beam using a movable device according to the amount of elongation of the wire rope. Because it can absorb the amount of wire rope stretch, it reduces the number of truncation operations, improves work efficiency when working and considers the work safety of workers in a simple and safe manner, with a balanced weight and buffer. It is possible to provide an elevator that can ensure a prescribed clearance with the machine. Furthermore, by arranging the car sheave 3b on the upper part of the car 3, it is possible for the worker who is placed on the car to easily check the working state and the moving distance.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the third embodiment, the same components as those described in the first and second embodiments are denoted by the same reference numerals, and the description of the same components is duplicated. Omitted.

  In the third embodiment of the present invention, unlike the elevator 1 in the first and second embodiments, as shown in FIGS. 7 and 8, the movable device 8 includes a counterweight 4 and a counterweight sheave 4a. It is characterized by being provided between. In the third embodiment, the sheave mounting beam 3a is provided at the lower part of the car 3. However, the sheave mounting beam 3a may be provided at the upper part of the car 3 as in the second embodiment.

  In the third embodiment, the distance between the counterweight 4 and the counterweight sheave 4a is widened in advance, and this state is set to a normal state. When the wire rope 2 is stretched under such a state, the stretch amount affects the clearance C between the counterweight 4 and the shock absorber 7c as in the first and second embodiments described above ( Clearance decreases).

  Therefore, when elongation occurs in the wire rope 2, the distance between the counterweight 4 and the counterweight sheave 4 a is shortened using the movable device 8. That is, the wire rope 2 from the hoisting machine 5 to the counterweight sheave 4a and the other rope hitch RH by shrinking the movable device 8 in accordance with the extension amount of the wire rope 2 and bringing the counterweight sheave 4a closer to the counterweight 4. Can be made longer than the length at the same location when the wire rope 2 is not stretched.

  In this way, by allowing the car sheave to move in the vertical direction, it is only necessary to adjust the vertical distance between the car and the sheave mounting beam using a movable device according to the amount of elongation of the wire rope. Because it can absorb the amount of wire rope stretch, it reduces the number of truncation operations, improves work efficiency when working and considers the work safety of workers in a simple and safe manner, with a balanced weight and buffer. It is possible to provide an elevator that can ensure a prescribed clearance with the machine.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In each of the above-described embodiments, the installation position of the movable device 8 is not particularly limited. For example, when the movable device 8 is installed between the car 3 and the sheave mounting beam 3a, the movable device 8 is provided on the car 3 side. It may be provided or may be provided on the sheave mounting beam 3a side.

  Further, a movable device is provided both between the car 3 and the sheave mounting beam 3a and between the counterweight 4 and the counterweight sheave 4a so that both the car sheave 3b and the counterweight sheave 4a can be moved. It is also possible.

  Furthermore, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine the component covering different embodiment suitably.

It is a figure showing the whole elevator composition concerning a 1st embodiment of the present invention. In the elevator which concerns on the 1st Embodiment of this invention, it is a figure which shows the state which ensured the clearance according to elongation of the wire rope. It is the elements on larger scale which expanded and represented the inside of the circle shown with the broken line of FIG. It is the elements on larger scale which expanded and represented the inside of the circle shown with the broken line of FIG. It is a figure which shows the whole structure of the elevator which concerns on the 2nd Embodiment of this invention. In the elevator which concerns on the 2nd Embodiment of this invention, it is a figure which shows the state which ensured the clearance according to elongation of the wire rope. It is a figure which shows the whole structure of the elevator which concerns on the 3rd Embodiment of this invention. In the elevator which concerns on the 3rd Embodiment of this invention, it is a figure which shows the state which ensured the clearance according to elongation of the wire rope.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Elevator 2 Wire rope 3 Ride car 3a Sheave installation beam 3b Car sheave 4 Balance weight 4a Balance weight sheave 5 Hoisting machine 5a Traction sheave 6 Hoistway 7a, 7b, 7c Shock absorber 8 Movable device

Claims (2)

A car that goes up and down in the hoistway,
A car sheave mounting beam provided at a lower portion of the car and connected to the car;
A car sheave attached to the car sheave mounting beam and laid over a wire rope;
A hoisting machine that moves the wire rope to raise and lower the car;
A counterweight connected to the wire rope hanging on the hoisting machine,
An elevator characterized in that the car sheave mounting beam provided at the lower part of the car and the car is connected by a movable device capable of changing the distance between them in a predetermined direction. The elevator according to claim 1, wherein the movable device is a manual or electric jack .

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