JP4226894B2 - Elevator rope traction increase device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a traction increasing device for an elevator rope that increases the traction performance between a rope connected to an elevator car and a sheave.
[0002]
[Prior art]
In the elevator apparatus, a main rope is stretched over a traction sheave connected to an output shaft of a hoisting machine or the like installed in a hoistway or a machine room, and a car is suspended from one end side of the main rope. Further, a counterweight is attached to the other end side of the main rope, and the cab and the counterweight are moved up and down in opposite directions by rotation of the traction sheave.
[0003]
In such an elevator apparatus, the frictional force between the traction sheave and the main rope (hereinafter referred to as traction) needs to be a predetermined value or more from the viewpoint of properly transmitting the rotational force of the sheave to the main rope. is there. In general, the weight of the counterweight is a constant value, but the weight of the car changes according to the use situation of the elevator user, and these weight changes, that is, the difference in weight from the car and the counterweight is handled by traction. There is a need. In particular, when the weight of the car is significantly reduced, there is a considerable weight difference between the zero load weight that is not used by elevator users and the maximum load weight that loads the maximum number of users. The weight ratio of the counterweight to the weight and maximum load weight is very large, and as a result, large traction is required.
[0004]
That is, when the traction is small, a relative slip occurs between the traction sheave and the main rope, which causes a significant hindrance to the operation of the elevator. As a result, many users are desired to realize a device that increases traction from the viewpoint of ensuring stable operation of the elevator.
[0005]
Therefore, conventionally, a traction increasing device as shown in FIG. 9 has been realized and disclosed.
[0006]
This traction increasing device has a structure in which a car 53 and a counterweight 54 are suspended from each end of a main rope 52 spanned over a traction sheave 51, and in the vicinity of the circumference of the traction sheave 51 with which the main rope 52 contacts. It is attached to. Specifically, in this traction increasing device, support boxes 60A and 60B having a shape adapted to the curved surface of the traction sheave 51 are fixed to the components of the elevator near the circumference in the left-right direction across the uppermost portion of the traction sheave 51. In each box 60a, 60B, five roller pressing mechanisms 61a-61e, 61f-61j are attached.
[0007]
Each roller pressing mechanism 61a,... Includes a roller 62 that contacts the main rope 52 spanned over the traction sheave 51, an arm 63 that rotatably supports the roller 62, and inner surfaces of the arm 63 and the boxes 60a and 60b. The spring 64 is interposed therebetween and presses the roller 62 against the main rope 52. The screw mechanism 65 adjusts the pressing force against the spring 64 from the outside of the boxes 60a and 60b.
[0008]
In such a traction increasing device, each of the roller pressing mechanisms 61a to 61e and 61f to 61j can independently adjust the pressing force, so that the roller pressing mechanisms 61a and 61j near the rope entrance / exit of the traction sheave 51 have a large force. The roller 62 is pressed, the pressing force is reduced as it approaches the uppermost part of the traction sheave 51, and the roller pressing mechanisms 61e and 61f closest to the uppermost part of the traction sheave 51 press the roller 62 with the smallest force. Moreover, by adjusting the pressing force using the screw mechanism 65, the overall contact surface pressure between the main rope 52 and the traction sheave 51 is increased, the traction is increased, and the main rope 52 comes into contact with the traction sheave 51. Since the surface pressure can be made almost uniform along the length, the increase in the maximum value of the surface pressure is minimized as compared with the case where each of the roller pressing mechanisms 61a to 61e and 61f to 61j is not provided. It is stated that it is possible to minimize wear.
[0009]
[Patent Literature]
Japanese Patent No. 2865894 (FIG. 1)
[0010]
[Problems to be solved by the invention]
By the way, the following problems are pointed out in the above traction increasing apparatuses.
[0011]
10 and 11 are schematic views of the surface pressure acting on the main rope 52 when the traction increasing device shown in FIG. 9 is not attached and when it is attached. That is, when the traction increasing device is not attached, as shown in FIG. 10, the surface pressure by the main rope 52 becomes 0 at the inlet and the outlet of the main rope 52 as ω0, and the longitudinal central axis of the traction sheave 51 It is distributed in a so-called mountain shape where the top is the largest.
[0012]
On the other hand, when the traction increasing device is attached, as shown in FIG. 11, the surface pressure acting on the main rope 52 is pressed by the roller pressing mechanisms 61a to 61e and 61f to 61j against the distribution of the surface pressure ω0 described above. The surface pressure increases ω1 to ωj0 of the roller 62 are superimposed. That is, although it is possible to suppress an increase in the maximum surface pressure on the central axis in the longitudinal direction of the traction sheave 51, the roller pressing mechanisms 61a to 61e and 61f to 61j are arranged only at intervals equal to or larger than the diameter of the roller 62. Since this is impossible, the surface pressure increases ω1 to ωj0 by the roller pressing mechanisms 61a to 61e and 61f to 61j are in a discontinuous distribution state.
[0013]
By the way, normally, the life of the main rope 52 is determined by the wear of the strands and the fatigue level of the strands due to repeated bending. In particular, the fatigue failure of a wire is greatly influenced not only by the maximum surface pressure at which it acts but also by the number of times the surface pressure is repeatedly applied. When the number of operations increases, the life of the traction sheave 51 including the main rope 52 decreases accordingly.
[0014]
As shown in FIG. 11, when the main rope 52 is driven in a state where the discontinuous surface pressure distribution is applied, the traction increases, but the number of repetitions of the surface pressure acting on the main rope 52 increases. The service life will be greatly reduced.
[0015]
The present invention has been made in view of the above circumstances, increasing the traction by the main rope, reducing the number of repeated surface pressures acting on the main rope, greatly extending the life of the main rope, It is an object of the present invention to provide an elevator rope traction increasing device that eliminates relative slip between a sheave and a main rope, and that enables a car to travel stably.
[0016]
[Means for Solving the Problems]
(1) In order to solve the above-mentioned problems, the present invention suspends a cage on one end side of a main rope spanned on a traction sheave arranged in a hoistway or in a machine room and a counterweight on the other end side. , An elevator device that lifts and lowers the car and the counterweight in opposite directions, from the top of the traction sheave Near the left and right circumferences of the sheave at the required distance First and second idler sheaves that are rotatably supported, and First and second A rope surface pressure increasing device is provided that includes an endless belt wound around an idler sheave and a tension applying mechanism that applies a displacement force to the idler sheave to apply a required tension to the endless belt, in accordance with the applied tension. Thus, the endless belt is an traction increasing device for an elevator rope that applies a pressing force to a main rope that is stretched over the traction sheave.
[0017]
In the present invention, the endless belt is given a predetermined tension by applying a displacement force to the idler sheave supported rotatably on the displacement shaft side by the tension applying mechanism. Therefore, it is possible to continuously increase the surface pressure acting on the main rope while suppressing the increase in the maximum value of the surface pressure acting on the main rope. It is possible to greatly extend the life of the main rope by reducing the number of surface pressure fluctuations repeatedly acting.
[0018]
(2) Further, in the present invention, a plurality of idler sheaves around which an endless belt is wound are joined by links so as to be displaced relative to each other, and an opening angle of these links is displaced to add tension to the endless belt. A mechanism may be provided. In this case, since the plurality of idler sheaves are relatively displaced from each other, the position where the increase in the surface pressure of the main rope is maximized can always be made constant.
[0019]
In addition, if a rope surface pressure increasing device is arranged at a location of the main rope other than the location where the rope surface pressure of the main rope due to the hanging load is maximum, while avoiding the maximum surface pressure due to the action of the main rope itself, It is possible to give the required increased surface pressure with an endless belt. In addition, the same effect can be obtained when the rope surface pressure increasing devices are respectively arranged in the vicinity of the left and right circumferences of the sheave at a required distance from the top of the traction sheave.
[0020]
(3) Further, according to the present invention, the endless belt is formed of a base material formed of a material having a low elastic modulus and a high strength material embedded in the base material, thereby reducing the rotational force of the idler sheave. It is possible to have both a function of reliably transmitting and a function capable of sufficiently dealing with strength when tension is applied to the endless belt.
[0021]
Further, according to the present invention, if a longitudinal groove is formed in the longitudinal direction of the base surface portion that contacts the main rope, the main rope can be fitted into the longitudinal groove of the endless belt to increase the contact area. Can be smoothly transmitted to the endless belt.Further, if a lateral groove is formed in the width direction of the base material surface contacting the main rope, the friction coefficient between the endless belt and the main rope can be increased. Movement can be smoothly transmitted to the endless belt.
[0022]
Further, as the tension applying mechanism, a mechanism capable of adjusting the tension of the endless belt can be provided so that the belt tension and the surface pressure acting on the main rope can be adjusted to a predetermined value.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0024]
(First embodiment)
FIG. 1A and FIG. 1B are a front view and a configuration diagram of a rope surface pressure increasing device showing an embodiment of a traction increasing device including a configuration of a part of an elevator apparatus according to the present invention.
[0025]
In the elevator apparatus, a main rope 2 is wound around a traction sheave 1 connected to an output shaft of a hoisting machine or the like installed in a hoistway or a machine room, and a car 3 is attached to one end side of the main rope 2. The counterweight 4 is suspended from the other end of the main rope 2, and the car 3 and the counterweight 4 are moved up and down in opposite directions as the traction sheave 1 rotates.
[0026]
The upper part of this traction sheave 1, that is, the upper part of the sheave that is closer to the counterweight side with a required distance from the uppermost part, and the upper part of the sheave that is closer to the car side with a similar distance from the uppermost part The rope surface pressure increasing devices 5a and 5b are respectively arranged in the two, and these two sets of rope surface pressure increasing devices 5a and 5b constitute an elevator rope traction increasing device.
[0027]
These rope surface pressure increasing devices 5a and 5b are disposed on opposite sides of the uppermost portion on the longitudinal central axis of the traction sheave 1, and the detailed configurations of the increasing devices 5a and 5b are the same. Therefore, hereinafter, the rope surface pressure increasing device 5a disposed on the left side of the drawing will be described, description of the rope surface pressure increasing device 5b disposed on the right side of the drawing will be omitted, and the description of the rope surface pressure increasing device 5a will be given.
[0028]
The rope surface pressure increasing device 5a includes a first idler sheave 7 that is rotatably supported on a shaft 6 that is fixed to an appropriate component of an elevator, for example, a motor frame or a support structure of the traction sheave 1. A second idler sheave rotatably supported on the side near the lower portion along the circumference of the sheave 1 than the first idler sheave 7, that is, on the displacement shaft side disposed at a position corresponding to the rope entrance to the traction sheave 1. The second idler sheave 8 is provided with a tension applying mechanism 10.
[0029]
As shown in FIG. 2B, the tension applying mechanism 10 has an opening formed in a concave shape to which a shaft 11 serving as a displacement shaft for rotatably supporting the second idler sheave 8 is attached. From the arm member 12, an elastic support base 14 disposed with an elastic member 13 such as a spring interposed on the opposite side of the opening of the arm member 12, that is, the central portion on the back side, and the elastic support base 14 A screw body 15 protruding on the rear end side, and a hole that is fixed to an appropriate structure (not shown) such as a motor frame or a support structure of the traction sheave 1 and penetrates the rear end side of the screw body 15. And a fastening member 17 such as a nut that is screwed into a screw body 15 penetrating outward from the hole of the fixed base 16 and expands and contracts the elastic member 13. The tightening member 17 is tightened so as to apply a required tension while being in contact with the fixed base 16, and is supported by the fixed base 16 even when an upward force is received by the screw body 15. Therefore, it is the structure which does not displace.
[0030]
Further, an endless belt 20 is wound around the first idler sheave 7 and the second idler sheave 8. Therefore, the traction sheave facing side of the endless belt 20 has a function of pressing the upper surface of the main rope 2 spanned over the traction sheave 1 against the traction sheave 1 with a predetermined pressing force.
[0031]
2 is a cross-sectional view taken along the line AA of FIG. 1 for explaining the contact relationship between the endless belt 20, the main rope 2, and the traction sheave 1. FIG. 3 is a perspective view of the endless belt 20. FIG.
[0032]
That is, the traction sheave 1 is formed with a plurality of rope grooves 18 in the circumferential direction, and the main rope 2 is wound along the rope grooves 18. On the other hand, the endless belt 20 includes a base material 21 made of a rubber material having a relatively low elastic modulus and easily deformed, such as natural rubber, butyl rubber, silicon rubber, polyurethane, and the like. It is composed of a reinforcing material 22 made of a high-strength material such as a metal wire, an aramid fiber, or a carbon fiber embedded so as to make a round, and further, the length of the surface portion of the base material 21 in contact with the main rope 2 A longitudinal groove 23 is formed in the direction. Therefore, the lower surface side of the main rope 2 is fitted along the rope groove 18 of the traction sheave 1, and the upper surface side of the main rope 2 is in contact with the inner surface of the longitudinal groove 23 constituting the endless belt 20.
[0033]
Next, the operation of the elevator rope traction increasing apparatus as described above will be described.
[0034]
First, when the tightening member 17 is tightened so as to rotate, for example, in the right direction, the screw body 15 is transferred in a direction retreating from the fixed base 16. At this time, the shaft 6 of the first idler sheave 7 is fixed. Therefore, a downward force F1 acts on the second idler sheave 8 via the elastic member 13-arm member 12-shaft 11 as shown in FIG. A reaction force F2 of the shaft 6 acts. As a result, tension is generated in the endless belt 20 itself by the forces F1 and F2.
[0035]
At this time, the longitudinal grooves 23 formed in the longitudinal direction of the inner surface of the endless belt 20 are in contact with the upper surface of the main rope 2 wound around the traction sheave 1 in an arc shape. A pressing force Fω2 to 1 is generated.
[0036]
The force F1 acting on the second idler sheave 8 can be easily measured from the extension amount of the elastic member 13. And if the force F1 is obtained, the force Fω2 by which the main rope 2 presses the traction sheave 1 can be obtained from the tension generated in the endless belt 20 and this tension. That is, by measuring the extension amount of the elastic member 13, the tension of the endless belt 20 and the force with which the main rope 2 presses the traction sheave 1 can be easily adjusted.
[0037]
Next, the surface pressure acting on the main rope 2 will be described.
[0038]
FIG. 5 is a diagram schematically showing the surface pressure distribution acting on the main rope 2. As is apparent from this figure, the surface pressure acting on the main rope 2 is ω0 when the rope surface pressure increasing devices 5a and 5b are not present, whereas the rope surface pressure increasing devices 5a and 5b are The surface pressure at the time of existence does not increase the maximum value of the surface pressure ω0 without the rope surface pressure increasing devices 5a, 5b, and the surface pressure ω0 in the left-right direction, which is a required distance away from the portion where the maximum value appears. The surface pressure increase ω2 by the pressure increasing devices 5a and 5b is superimposed.
[0039]
The surface pressure increase ω2 by the rope surface pressure increasing devices 5a and 5b is continuous along the length of contact of the endless belt 20 with the main rope 2 without increasing the maximum value of the surface pressure ω0 as described above. The size is 0 at both ends of the belt contact portion, and is maximum at the center portion of the contact portion. In this case, if the position to which the rope surface pressure increasing devices 5a and 5b are attached and the force with which the main rope 2 presses the traction sheave 1 are appropriately adjusted, the rope surface pressure increasing devices 5a and 5b can act on the main rope 2 compared to the case without the rope surface pressure increasing devices 5a and 5b. The surface pressure can be continuously distributed while suppressing an increase in the maximum value of the surface pressure.
[0040]
Furthermore, the movement of the main rope 2 and the endless belt 20 when the traction sheave 1 is driven and the surface pressure fluctuation acting on the main rope 2 will be described.
[0041]
When the traction sheave 1 is driven by a motor (not shown), the main rope 2 stretched over the sheave 1 moves along the circumference of the traction sheave 1. A vertical groove 23 of the endless belt 20 is fitted on the upper surface of the main rope 2, the contact area between the main rope 2 and the endless belt 20 is large, and a rubber-based material is used for the contact portion of the endless belt 20. Therefore, the coefficient of friction between the main rope 2 and the endless belt 20 is very large. As a result, the endless belt 20 moves smoothly in conjunction with the movement of the main rope 2.
[0042]
Since the endless belt 20 is wound around the first idler sheave 7 and the second idler sheave 8, the endless belt 20 moves in conjunction with the main rope 2 and then reaches the idler sheave. It moves along the circumference, and eventually moves in a circulating manner between the first idler sheave 7 and the second idler sheave 8. In other words, in conjunction with the movement of the main rope 2, the endless belt 20 moves and is wound around one idler sheave, but another portion of the endless belt 20 is sent out from the other idler sheave. Even if the sheave 1 is driven, the surface pressure distribution as shown in FIG. 5 is maintained.
[0043]
Here, paying attention to a certain portion of the main rope 2, the history of the surface pressure fluctuation that the portion receives from the time it is wound on the traction sheave 1 until it is sent out will be considered. For example, when the car descends, the main rope 2 is wound around the traction sheave 1 at the portion shown in FIG. 5 and is sent out via the portion shown in FIG. Accordingly, the surface pressure corresponding to each part is sequentially received. Although the surface pressure distribution shown in FIG. 5 has some variation, the surface pressure variation is very small compared to the conventional surface pressure distribution shown in FIG. Can be reduced.
[0044]
Further, the endless belt 20 is required to have two functions: (a) a function that can be easily hung around the idler sheave, and (b) a function that can sufficiently resist the tension acting on the endless belt. The Regarding (a), a rubber material having a low elastic modulus and being easily deformed is used for the base material 21 and a high-strength material used for the reinforcing material 22 is in the form of fibers or threads. It can bend easily and satisfy this function. As for (b), since a high-strength material such as a fiber or thread is used for the reinforcing material 22, most of the tension can be borne by the reinforcing material 22, and this function can also be satisfied. .
[0045]
Therefore, according to the rope surface pressure increasing devices 5a and 5b of the embodiments as described above, the rope surface pressure increasing devices 5a and 5b are rotatably supported in the vicinity of the left and right circumferences with a predetermined interval across the uppermost portion of the traction sheave 1. A plurality of idler sheaves 7, 8, an endless belt 20 wound around these idler sheaves 7, 8, and one idler sheave 7 is an idler sheave for fixed shaft side support rotation, and the other displacement shaft side idler sheave 8 is Since the tension applying mechanism 10 is attached and the endless belt 20 between the idler sheaves 7 and 8 is pressed against the main rope 2 engaged with the traction sheave 1, the surface pressure acting on the main rope 2 is continuously increased. In addition, the number of surface pressure fluctuations that repeatedly act when the main rope 2 is driven can be greatly reduced, and the life of the main rope 2 can be greatly extended.
[0046]
Further, the surface pressure acting on the main rope 2 can be reduced by arranging the rope surface pressure increasing devices 5a and 5b in the vicinity of the circumference of the traction sheave 1 while avoiding the portion of the maximum value of the surface pressure acting on the main rope 2. An increase in the maximum value can also be suppressed, and contributes to an increase in the life of the main rope 2 as well.
[0047]
Further, the endless belt 20 to be used has a function that can be easily wound around the idler sheaves 7 and 8 and a function that can sufficiently resist the tension acting on the endless belt 20. The endless belt 20 can be smoothly moved in conjunction with the movement of 2.
[0048]
Furthermore, although the tension applying mechanism 10 can be attached to the rope surface pressure increasing devices 5a and 5b, the pressing force applied to the main rope 2 can be easily adjusted while changing the tension of the endless belt 20, and the required endless belt tension and The surface pressure acting on the main rope 2 can be set.
[0049]
In the above embodiment, the upper idler sheave 7 side is rotatably attached to the fixedly installed shaft 6, and the lower idler sheave 8 side is attached with the tension applying mechanism 10, but conversely the lower idler sheave 8 is attached. The tension applying mechanism 10 may be attached to the upper idler sheave 7 side.
[0050]
(Second Embodiment)
FIG. 6 is a front view showing another embodiment of the traction increasing apparatus including the configuration of a part of the elevator apparatus according to the present invention.
[0051]
In this embodiment, the position where the increase in the surface pressure of the main rope 2 by the rope surface pressure increasing device is maximized is always made constant. That is, in the first embodiment, the position of the first idler sheave 7 supported on the fixed shaft side is always a fixed position, and the position of the second idler sheave 8 is the force applied by the tension applying mechanism 10. As a result, the position where the surface pressure increase of the main rope 2 existing at the midpoint between the first idler sheave 7 and the second idler sheave 8 becomes the maximum is added by the tension applying mechanism 10. It varies slightly depending on the force.
[0052]
On the other hand, in the second embodiment, the position where the increase in the surface pressure of the main rope 2 is maximized is always constant.
[0053]
In this elevator apparatus, a main rope 2 is stretched over a traction sheave 1, a car 3 is suspended at one end of the main rope 2, and a counterweight 4 is suspended at the other end of the main rope 2. This is the same as in FIG. In addition, the rope surface pressure increasing devices 30a and 30b are provided in the vicinity of the circumference of the traction sheave 1 with a required distance left and right across the upper portion of the traction sheave 1, and the rope surface pressure increasing devices 30a and 30b are provided as elevators. The construction of the rope traction increasing device is also the same as in FIG. Since the detailed configuration of the rope surface pressure increasing devices 30a and 30b is the same, the rope surface pressure increasing device 30a disposed on the left side of the drawing will be described below, and the rope surface pressure increasing device 30b disposed on the right side of the drawing will be described. The description will be omitted, and the description will be given of the rope surface pressure increasing device 30a.
[0054]
The rope surface pressure increasing device 30 a includes a first idler sheave 31 disposed on the upper side near the circumference of the traction sheave 1, and a second idler sheave 32 disposed on the lower side near the circumference of the traction sheave 1. These sheaves 31 and 32 are rotatably attached to one tension applying mechanism 33.
[0055]
The tension applying mechanism 33 includes a first link 36 and a second link 37 to which shafts 34 and 35 for rotatably supporting the idler sheaves 31 and 32 are attached, and the two links 36 and 37. A third link 39 that is rotatably supported on the same shaft 38, and a central portion on the back side opposite to the links 36 and 37 of the third link 39 are arranged via an elastic member 40 such as a spring. An elastic body support base 41, a screw body 42 projecting from the elastic body support base 41 toward the rear end, and an appropriate structure (not shown) such as a motor frame or a support structure for the traction sheave 1 Among the fixed base 43 that is fixed and formed with a hole through which the rear end side of the screw body 42 passes, and the screw body 42 that penetrates outward from the hole of the fixed base 43, the inside of the fixed base 43 Located in It is constituted by a fastening member 44 such as a nut screwed on the ball screw 42.
[0056]
Each link 36, 37 supports the both ends of the shafts 34, 35 using a U-shaped member on the tip side, or two members that make a pair are separated from each other by a predetermined distance on the same shaft 38. For example, a configuration may be adopted in which both ends of the shaft 34 are supported on the tip ends of the two members.
[0057]
Further, an endless belt 45 is wound around the first idler sheave 31 and the second idler sheave 32. Therefore, the traction sheave facing side of the endless belt 45 has a function of pressing the upper surface of the main rope 2 stretched over the traction sheave 1 against the traction sheave 1 with a predetermined pressing force. Since the structure of the endless belt 45 is the same as that of the first embodiment, the description thereof is omitted here and omitted.
[0058]
Next, the operation of the above surface pressure increasing device will be described.
[0059]
Now, when the tightening member 44 is rotated in the right direction and the screw body 42 is displaced in the lower right direction, the elastic member 40 receives the compression force in the lower right direction and contracts, and via the third link 39 and the shaft 38. Thus, a force is applied in a direction in which the crossing angle between the first link 36 and the second link 37 is increased. At this time, the first idler sheave 31 is attached to the first link 36, the second idler sheave 32 is attached to the second link 37, and the first idler sheave 31 and the second idler sheave 32 are endless. Since the belt 45 is wound around, the force applied to the first link 36 and the second link 37 increases the tension of the endless belt 45 and also presses the traction sheave 1 against the main rope 2. Increase.
[0060]
As a result, also in this embodiment, a surface pressure distribution as shown in FIG. 6 can be obtained, and the tension of the endless belt 45 and the traction sheave 1 to the traction sheave 1 with respect to the main rope 2 according to the tightening degree of the tightening member 44. The pressing force can be easily adjusted. Further, when the tension of the endless belt 45 increases, the endless belt 45 extends by the amount of elastic deformation, and both the first idler sheave 31 and the second idler sheave 32 are displaced, but the displacement amounts are equal. For this reason, the position where the increase in the surface pressure of the main rope 2 is maximized, that is, the position of the midpoint between the first idler sheave 31 and the second idler sheave 32 can be made constant.
[0061]
Other operations are the same as those in the first embodiment, and will be described in the description of the embodiment.
[0062]
Therefore, according to the embodiment as described above, the number of surface pressure fluctuations repeatedly acting when the main rope 2 is driven can be reduced as in the first embodiment, and the life of the main rope 2 can be greatly increased. It can be extended. Even when the rope surface pressure increasing devices 30a and 30b are provided, an increase in the maximum value of the surface pressure acting on the main rope 2 without the rope surface pressure increasing devices 30a and 30b can be suppressed. Further, the portion where the increase in the surface pressure of the main rope 2 is maximized can always be constant.
[0063]
(Third embodiment)
In this embodiment, as shown in FIGS. 7 and 8, the configuration of the endless belt 45 is different. 7 is a cross-sectional view showing the contact relationship between the endless belt 45, the main rope 2, and the traction sheave 1, and FIG. 8 is a perspective view showing only the endless belt 45. As shown in FIG.
[0064]
As in FIG. 3, the traction sheave 1 has a plurality of rope grooves 18 formed in the circumferential direction of the sheave, and the main rope 2 is wound around the rope grooves 18.
[0065]
On the other hand, the endless belt 45 includes a base material 46 made of a rubber material having a relatively low elastic modulus and easily deformed, such as natural rubber, butyl rubber, silicon rubber, and polyurethane, and a longitudinal direction in the base material 21. A base material 46 which is composed of a reinforcing material 47 made of a belt-like or cloth-like high-strength material such as a metal belt, an aramid fiber cloth, a carbon fiber cloth, etc., which is embedded so as to make a round, and is in contact with the main rope 2. A lateral groove 48 that intersects the width direction of the surface portion, that is, the upper surface of the main rope 2 is formed.
[0066]
Therefore, when the endless belt 45 as described above is used, when the traction sheave 1 is driven by a motor (not shown), the wound main rope 2 moves along the circumference of the traction sheave 2. At this time, the upper surface of the main rope 2 intersects and contacts the lateral groove 48 formed in the endless belt 45, and a rubber-based material is used for the contact portion of the endless belt 45. The coefficient of friction with the endless belt 45 is very large. As a result, the endless belt 45 moves smoothly in conjunction with the movement of the main rope 2.
[0067]
Further, the endless belt 45 is required to have two functions: (a) a function that can be easily hung around an idler sheave, and (b) a function that can sufficiently resist the tension acting on the endless belt. The Regarding (a), the base material 46 is made of a rubber-based material that has a low elastic modulus and is easily deformed, and the high-strength material used for the reinforcing material 47 is fibrous or thread-like. It can bend easily and satisfy this function. Regarding (b), since a high-strength material such as a fiber or thread is used for the reinforcing material 47, most of the tension can be borne by the reinforcing material 47, and this function can also be satisfied. .
[0068]
Therefore, according to the embodiment as described above, the friction coefficient between the endless belt 45 and the main rope 2 can be increased, and the movement of the main rope 2 can be smoothly transmitted to the endless belt 45. Further, it is possible to rationally select a belt material that can sufficiently cope with the tension acting on the endless belt 45 and can wrap the endless belt 45 around the idler sheave.
[0069]
Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the invention. In the above embodiment, the longitudinal grooves 23 and the transverse grooves 48 are formed on the surface portions of the base material constituting the endless belts 20 and 45. For example, the surface portions of the base material are randomly or regularly provided with concave portions or convex portions. The part may be formed.
[0070]
In addition, the embodiments can be implemented in combination as much as possible, and in that case, the effect of the combination can be obtained. Further, each of the above embodiments includes various higher-level and lower-level inventions, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, when an invention is extracted because some constituent elements can be omitted from all the constituent elements described in the means for solving the problem, the omitted part is used when the extracted invention is implemented. Is appropriately supplemented by well-known conventional techniques.
[0071]
【The invention's effect】
As described above, according to the present invention, the life of the main rope can be greatly extended by increasing the traction and reducing the number of repeated surface pressures acting on the main rope.
[0072]
Moreover, based on the configuration of the traction increase and the endless belt, it is possible to provide a traction increase device for an elevator rope that eliminates relative slip between the traction sheave and the main rope, and that allows the car to travel stably.
[Brief description of the drawings]
FIG. 1 is a configuration diagram illustrating an embodiment of an elevator rope traction increasing device according to the present invention including a partial configuration of an elevator device, and a configuration diagram illustrating an example of a rope surface pressure increasing device.
FIG. 2 is a cross-sectional view taken along the line AA shown in FIG.
FIG. 3 is a perspective view showing a partial cross section for explaining an example of an endless belt.
FIG. 4 is a diagram for explaining a force acting on an idler sheave constituting the rope surface pressure increasing device and a pressing force to the traction sheave against the main rope;
FIG. 5 is a diagram for explaining a surface pressure distribution acting on a main rope.
FIG. 6 is a configuration diagram illustrating another embodiment of an elevator rope traction increasing device according to the present invention, including a partial configuration of the elevator device.
FIG. 7 is a configuration diagram illustrating another embodiment of the elevator rope traction increasing device according to the present invention.
FIG. 8 is a perspective view showing a partial cross section for explaining another example of an endless belt.
FIG. 9 is a front view of a conventional traction increasing device including a partial configuration of the elevator apparatus.
FIG. 10 is a view for explaining a surface pressure distribution acting on a conventional main rope when there is no traction increasing device.
FIG. 11 is a diagram for explaining a surface pressure distribution acting on a conventional main rope when a traction increasing device is provided.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Traction sheave, 2 ... Main rope, 3 ... Ride car, 4 ... Counterweight, 5 ... Elevator rope traction increase device, 5a, 5b, 30a, 30b ... Rope surface pressure increase device, 7, 31 ... 1st Idle sheave, 8, 32 ... second idler sheave, 10,33 ... tension applying mechanism, 12 ... arm member, 13,40 ... elastic member, 14,41 ... elastic body support base, 15,42 ... screw body, 16 , 43 ... Fixed base, 17, 44 ... Tightening member, 20, 45 ... Endless belt, 21, 46 ... Base material, 22, 47 ... Reinforcement material, 23 ... Vertical groove, 30a, 30b ... Rope surface pressure increasing device, 36 ... 1st link, 37 ... 2nd link, 38 ... shaft, 39 ... 3rd link, 48 ... transverse groove

Claims (7)

A car is suspended from one end of the main rope that is placed in the hoistway or a traction sheave arranged in the machine room, and a counterweight is suspended from the other end, and the counterweight is lifted and lowered in the opposite direction. In elevator equipment,
The first and second idler sheaves that are rotatably supported in the vicinity of the left and right circumferences of the sheave at a required distance from the uppermost part of the traction sheave, and are wound around the first and second idler sheaves. A rope surface pressure increasing device including an endless belt and a tension applying mechanism that applies a displacement force to at least one of the first and second idler sheaves and applies a required tension to the endless belt;
The elevator rope traction increasing device according to claim 1, wherein the endless belt applies a pressing force to the main rope spanned over the traction sheave according to the applied tension. A car is suspended from one end of the main rope that is placed in the hoistway or a traction sheave arranged in the machine room, and a counterweight is suspended from the other end, and the counterweight is lifted and lowered in the opposite direction. In elevator equipment,
A plurality of idler sheaves rotatably supported in the vicinity of the left and right circumferences of the sheave at a required distance from the top of the traction sheave; an endless belt wound around the plurality of idler sheaves; and the plurality of idlers A rope surface pressure increasing device provided with a tension adding mechanism that joins the sheaves with links so as to displace relative to each other, displaces the opening angle of these links and applies tension to the endless belt,
The elevator rope traction increasing device according to claim 1, wherein the endless belt applies a pressing force to the main rope spanned over the traction sheave according to the applied tension. In the elevator rope traction increasing device according to claim 1 or 2,
A rope surface pressure increasing device is disposed at a location of the main rope other than the location where the rope surface pressure of the main rope due to the suspension load is maximum, and the main rope is provided with the required increased surface pressure via the endless belt. A traction increasing device for an elevator rope, which applies a pressing force to the rope. In the elevator rope traction increasing device according to any one of claims 1 to 3 ,
The traction increasing device for an elevator rope, wherein the tension applying mechanism includes a mechanism capable of adjusting a tension of the endless belt. In the elevator rope traction increasing device according to any one of claims 1 to 3,
The traction increasing device for an elevator rope, wherein the endless belt is formed of a base material formed of a material having a low elastic modulus and a high-strength material embedded in the base material. In the elevator rope traction increasing device according to any one of claims 1 to 3,
A traction increasing device for an elevator rope, wherein a longitudinal groove is formed in a longitudinal direction of a base material surface portion of the traction sheave and the endless belt contacting the main rope. In the elevator rope traction increasing device according to any one of claims 1 to 3,
A traction increasing device for an elevator rope, characterized in that a lateral groove is formed in the width direction of the base material surface portion of the endless belt contacting the main rope.

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