1. An elevator apparatus, comprising: an elevator car and a balance weight which move up and down in a hoistway formed in a building; a main rope configured to suspend the elevator car and the balance weight; a hoisting machine including a sheave around which the main rope is wound; a machine base configured to support the hoisting machine; and a machine beam disposed at a lower portion of the machine base, the elevator apparatus further comprising: a main vibration-proof mechanism disposed between the machine base and the machine beam and/or between the machine beam and the building side and configured to suppress that vibration by the hoisting machine is propagated to the building; and an upper/lower vibration-proof mechanism at least comprising a first elastic body disposed between the machine beam and the building side and configured to suppress upper/lower resonance vibration generated on the hoisting machine. 32

2. The elevator apparatus according to claim 1, wherein the upper/lower vibration-proof mechanism comprises: a leg portion of which an upper end is fixed to a lower portion of the machine beam, and a lower end is fixed on the building side; a first bracket material of which one end is connected to the leg portion, and another end is fixed on the building side; and the first elastic body interposed between one end of the first bracket material and the leg portion.

3. The elevator apparatus according to claim 2, comprising an upper horizontal vibration-proof mechanism configured to suppress a horizontal resonance vibration generated on the hoisting machine, the upper horizontal vibration-proof mechanism, comprising: a second bracket material of which one end is connected to an arm extending to an outer side from a lower surface of the machine base, and another end is fixed on an upper surface of the machine beam; and a second elastic body interposed between one end of the second bracket material and the arm extending to the outer side from the lower surface of the machine base.

4. The elevator apparatus according to claim 3, comprising a lower horizontal vibration-proof mechanism 33 configured to suppress horizontal resonance vibration generated on the hoisting machine, the lower horizontal vibration-proof mechanism, comprising: a base of which an upper surface is connected to another end of the first bracket material and a lower surface is fixed to the building; a third bracket material of which one end is connected to the leg portion, and another end is fixed to the base; and a third elastic body interposed between one end of the third bracket material and the leg portion.

5. The elevator apparatus according to claim 2, wherein the main vibration-proof mechanism is disposed between a lower surface of the machine base and an upper surface of the machine beam and comprises an upper main vibration-proof mechanism configured to suppress that vibration generated by the hoisting machine is propagated to the building.

6. The elevator apparatus according to claim 4, wherein the main vibration-proof mechanism is disposed between a lower surface of the machine base and an upper surface of the machine beam and comprises an upper main vibration-proof mechanism configured to suppress that vibration generated by the hoisting machine is propagated to the building.

7. The elevator apparatus according to claim 5, wherein the main vibration-proof mechanism is disposed between a lower 34 surface of the machine beam and the building side and comprises a lower main vibration-proof mechanism configured to suppress that vibration generated by the hoisting machine is propagated to the building.

8. The elevator apparatus according to claim 6, wherein the main vibration-proof mechanism is disposed between a lower surface of the leg portion and an upper surface of the base and comprises a lower main vibration-proof mechanism configured to suppress that vibration generated by the hoisting machine is propagated to the building.

9. The elevator apparatus according to claim 6, wherein the Young's modulus of each of the first elastic body and the third elastic body is larger than the Young's modulus of the second elastic body.

10. The elevator apparatus according to claim 8, wherein the Young's modulus of each of the first elastic body and the third elastic body is larger than the Young's modulus of the second elastic body.

TITLE OF THE INVENTION
ELEVATOR APPARATUS
BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001]
The present invention relates to an elevator apparatus
and especially relates to an elevator apparatus having functions
to suppress vibration by a hoisting machine.
2. Description of the Related Art
[0002]
In general, in an elevator apparatus, a vibration-proof
mechanism to prevent that vibration by a hoisting machine is
propagated to a building is disposed between the hoisting
machine and the building.
However, in recent years, a natural frequency of a sheave
is increased by an increase in the speed of an elevator.
Consequently, a phenomenon appears that a hoisting machine
resonates in accord with a natural frequency of the hoisting
machine. In a plurality of resonance vibration modes,
especially, a mode in which a hoisting machine swings up and
down, in other words, a pitching mode, directly affects ride
comfort of an elevator car connected to the hoisting machine
and therefore needs to be certainly suppressed.
[0003]
3
JP 2007-16974 A describes a vibration-proof apparatus
which is not affected by a direction of a load acting on a
vibration-proof rubber of a vibration-proof mechanism. In JP
2007-16974 A, the vibration-proof apparatus (a vibration-proof
rubber) is interposed between a first beam supporting a hoisting
machine and a second beam supporting the first beam. In the
vibration-proof apparatus, an elastic member is interposed
between a first plate and a second plate, which are disposed
oppositely each other. The elastic member includes a bracket
disposed on the first plate side and including a recessed portion
and a square bar disposed on the second plate side and fitted
into and engaged with the recessed portion. Further, the
vibration-proof apparatus includes a bar and a stopper. One
end of the bar is welded and fixed on the bracket, and the bar
is projected by penetrating the first plate. The stopper is
projected by penetrating the second plate. The projected
portion of the bar and the first beam are screwed, and the
projected portion of the stopper and the second beam are screwed.
Then, when the bracket comes into contact with the square bar,
a positional displacement between the bracket and the square
bar in a direction along the plate can be limited within a certain
range.
[0004]
SUMMARY OF THE INVENTION
4
[0005]
To suppress upper/lower vibration by a hoisting machine,
it is necessary to increase an elastic modulus in a vertical
direction of a vibration-proof rubber disposed between the
hoisting machine and a building. However, in the case where
the above-described vibration-proof rubber described in JP
2007-16974 A is used, when the elastic modulus in a vertical
direction is increased, an elastic modulus in a lateral
direction is changed on the structure. Therefore, there is an
issue that a primary vibration-proof performance of the
vibration-proof rubber to prevent that vibration by the hoisting
machine is propagated to the building may be affected.
Specifically, it is difficult that an elastic modulus of a
vibration-proof rubber is optimized to suppress a plurality of
vibration modes. Further, the vibration-proof rubber
described in the above-described JP 2007-16974 A has a
complicated structure, and therefore it is difficult to reduce
cost.
Therefore, the present invention provides an elevator
apparatus which can certainly suppress upper/lower resonance
vibration generated by the hoisting machine with a simple
structure with no effect on a primary vibration-proof
performance of a vibration-proof mechanism.
[0006]
5
To solve the above-described issue, an elevator
apparatus includes an elevator car, a balance weight, a main
rope, a hoisting machine, a machine base, and a machine beam.
The elevator car and the balance weight move up and down in a
hoistway formed in a building. The main rope suspends the
elevator car and the balance weight. The hoisting machine
includes a sheave around which the main rope is wound. The
machine base supports the hoisting machine. The machine beam
is disposed at a lower portion of the machine base. The elevator
apparatus further includes a main vibration-proof mechanism and
an upper/lower vibration-proof mechanism. The main
vibration-proof mechanism is disposed between the machine base
and the machine beam and/or between the machine beam and the
building side and suppresses that vibration by the hoisting
machine is propagated to the building. The upper/lower
vibration-proof mechanism at least includes a first elastic body
disposed between the machine beam and the building side and
suppresses upper/lower resonance vibration generated on the
hoisting machine.
[0007]
According to the present invention, with no effect on
a primary vibration-proof performance of a vibration-proof
mechanism, upper/lower resonance vibration generated in a
hoisting machine can be certainly suppressed with a simple
structure.
6
An issue, a configuration, and an effect other than the
above are clarified by descriptions of the following
embodiments.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008]
Fig. 1 is a schematic configuration view illustrating
an elevator apparatus applying the present invention;
Fig. 2 is a side surface view illustrating a configuration
and a supporting structure of a hoisting machine according to
an embodiment of the present invention;
Fig. 3 is an elevation view illustrating the supporting
structure of the hoisting machine when viewed from the A
direction in Fig. 2;
Fig. 4 is a side view illustrating a vibration state in
a pitching mode (an electric motor side) of a hoisting machine
including an upper main vibration-proof mechanism and a lower
main vibration-proof mechanism;
Fig. 5 is a side view illustrating a vibration state in
a pitching mode (a brake side) of the hoisting machine including
an upper main vibration-proof mechanism and a lower main
vibration-proof mechanism;
Fig. 6 is a side surface view illustrating a configuration
and a supporting structure of a hoisting machine according to
another embodiment of the present invention; and
7
Fig. 7 is an elevation view illustrating the supporting
structure of the hoisting machine when viewed from the A
direction in Fig. 6.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
[0009]
An embodiment of the present invention will be described
below with reference to the drawings.
First Embodiment
[0010]
First, a general configuration of an elevator apparatus
applying the present invention will be described. As known
generally, an elevator apparatus is stored in a hoistway
provided in a building.
Fig. 1 is a schematic configuration view illustrating
the elevator apparatus applying the present invention.
In Fig. 1, in an elevator apparatus 1, a hoisting machine
4 is placed in a machine room 3 formed at a top portion of a
hoistway 2 and fixed on a floor surface of the machine room 3
by a fixing tool such as a bolt. The hoisting machine 4 includes
a sheave to suspend a plurality of main ropes 5, which is not
illustrated in detail in Fig. 1. One end of the main rope 5
extending from the sheave is connected to an upper end of a
balance weight 7 via a warped pulley 6, and another end is
connected to an upper end of an elevator car 8.
8
[0011]
An operation of each portion of the elevator apparatus
1 during operation will be described next.
When the hoisting machine 4 is operated, and a sheave
is rotated, the main rope 5 suspended by the sheave moves along
an rotation direction of the sheave by friction between the main
rope 5 and the sheave. Then, in accordance with the movement
of the main rope 5, the balance weight 7 and the elevator car
8 move up and down in an opposite direction each other. In the
actual elevator apparatus 1, a guide component called a guide
rail guides on a side surface of the elevator car 8 and the balance
weight 7 to smooth elevation of the elevator car 8, although
such configuration is not illustrated in Fig. 1.
[0012]
In such the elevator apparatus 1, a controller (not
illustrated) sends an operation command to an electric motor
and a braking mechanism included in the hoisting machine 4, and
by this operation command, the elevator car 8 moves up and down
toward a predetermined story in a construction. Although the
elevator apparatus 1 is simplified in the above description,
actually further various elements are added.
[0013]
Next, a configuration of the hoisting machine 4 will be
descried with reference to Figs. 2 and 3.
9
Fig. 2 is a side surface view illustrating a configuration
and a supporting structure of a hoisting machine according to
an embodiment of the present invention. Fig. 3 is an elevation
view illustrating the supporting structure of the hoisting
machine when viewed from the A direction in Fig. 2.
As illustrated in Fig. 2, the hoisting machine 4 includes
an electric motor 10, a sheave 11, a brake disk 12, and a pair
of bearing stands 13. Then, the sheave 11 includes a driving
shaft 14. Further, the hoisting machine 4 includes a brake 15
and a machine base 16. Although this machine base 16 will be
described later, the machine base 16 is placed on and fixed to
the machine beam 17 which functions as a machine base placement
member.
[0014]
The electric motor 10 and the driving shaft 14 will be
further described herein.
The electric motor 10 is disposed on the machine base
16. One end of the driving shaft 14 fixed to the sheave 11 is
rotatably attached to the electric motor 10. The driving shaft
14 is rotatably supported by a pair of the bearing stands 13.
When the electric motor 10 is driven, the driving shaft 14 is
rotated, and the sheave 11 is rotated interlocking with rotation
of the driving shaft 14.
The bearing stand 13 includes an electric motor side
bearing stand 13a and a brake disk side bearing stand 13b and
10
is supported by the machine base 16. The electric motor side
bearing stand 13a supports an end on the electric motor 10 side
in an axial direction of the driving shaft 14. Further, the
brake disk side bearing stand 13b supports a brake 15 and an
end portion on the side opposite to the electric motor 10 in
an axial direction of the driving shaft 14. In the embodiment,
two bearing stands including the electric motor side bearing
stand 13a and the brake disk side bearing stand 13b support the
driving shaft 14. However, one bearing stand may support the
driving shaft 14. In this case, one bearing stand is integrated
with a housing of the electric motor 10 and supports the brake
15 and the end portion on the electric motor 10 side of the driving
shaft 14 and.
[0015]
The sheave 11 is formed in a cylindrical shape, and a
through hole (not illustrated) is formed at an axial center
thereof. A diameter of the through hole is substantially equal
to an outer diameter of the driving shaft 14. The driving shaft
14 penetrates the through hole of the sheave 11 and is fixed
to the sheave 11.
A winding portion 18 to wind the main rope 5 (illustrated
in Fig. 1) is formed on an outer peripheral surface of the sheave
11. This winding portion 18 includes a plurality of rope housing
grooves 18a in which the main rope 5 is wound at predetermined
intervals along an axial direction of the sheave 11 and includes
11
a protruded portion 18b to define the groove between the rope
housing grooves 18a adjacent to each other in an axial direction.
A width of one of the rope housing grooves 18a in an axial
direction of the sheave 11 is substantially same as or slightly
larger than a diameter of the main rope 5.
[0016]
When the sheave 11 is rotated, the main rope 5 is wound
in the rope housing grooves 18a of the winding portion 18.
Further, a projected portion 19 and a flange portion 20 are
provided at both ends in an axial direction of the sheave 11.
[0017]
The projected portion 19 is disposed at one end (the
electric motor 10 side) in an axial direction of the sheave 11.
The projected portion 19 is projected on an outer side in a radial
direction of the sheave 11, and a diameter of the projected
portion 19 is larger than an outer diameter of the winding
portion 18 of the sheave 11, in other words, an outer diameter
of the protruded portion 18b defining the rope housing grooves
18a. As a result, it is prevented that the main rope 5 wound
around the winding portion 18 comes off from the projected
portion 19 side.
[0018]
The flange portion 20 is disposed at another end portion
in an axial direction of the sheave 11. The flange portion 20
is projected toward an outer side in a radial direction of the
12
sheave 11. An outer diameter of the flange portion 20 is larger
than an outer diameter of the projected portion 19. A fitting
portion 21 is provided between the flange portion 20 and the
winding portion 18 of the sheave 11.
The brake disk 12 is fixed to the fitting portion 21.
An outer diameter of the fitting portion 21 is larger than a
diameter of the projected portion 19. In addition, a length
in an axial direction of the fitting portion 21 is equal to or
slightly larger than a length in an axial direction of the brake
disk 12.
[0019]
The brake disk 12 is fixed to the fitting portion 21 by
abutting on an opposed surface 20a facing with the electric motor
10 in the flange portion 20. As a result, the brake disk 12
is rotated interlocking with the sheave 11 rotated by drive of
the electric motor 10. When control driving current flows to
the brake 15, an electromagnetic coil in the brake 15 is excited,
and the brake disk 12 becomes a free state. On the other hand,
when the control driving current to the brake 15 is blocked,
the electromagnetic coil is degaussed, and a braking force is
applied to the brake disk 12 by a brake spring (not illustrated).
[0020]
A supporting structure of the hoisting machine 4 will
be described next.
13
The hoisting machine 4 is integrated with the machine
base 16 by using such as a bolt. An H-steel is used in the machine
base 16, the machine base 16 includes flat surface portions 16a
on upper and lower sides, and a supporting surface portion 16b
extending in a vertical direction supports the flat surface
portions 16a. H-steels are used on all of four side surfaces
of the machine base 16. Further, in Fig. 2, on each of right
and left end surfaces of the machine base 16, an H-steel is fitted
to the H-steels forming the four side surfaces, and the each
end surface has a hexahedral shape.
[0021]
Further, as illustrated in Fig. 3, the machine base 16
integrated with the hoisting machine 4 is placed on and fixed
to the machine beam 17 via a supporting steel plate 22a, a
vibration-proof rubber 22b, and a fixing steel plate 22c. The
machine beam 17 has a function as a machine base mounting member
as described above, and generally an H-steel is used. The
machine beam 17 includes flat surface portions 17a on upper and
lower sides, and a supporting surface portion 17b extending in
a longitudinal direction supports the flat surface portions 17a.
Further, the supporting steel plate 22a, the vibration-proof
rubber 22b, and the fixing steel plate 22c form an upper main
vibration-proof mechanism 22 which suppresses that vibration
by the hoisting machine 4 is propagated to a building. An
elastic modulus of the vibration-proof rubber 22b is set to an
14
appropriate value to prevent vibration propagation to the
building. Further, the supporting steel plate 22a and the
vibration-proof rubber 22b are integrated by crimping. In the
example illustrated in Fig. 3, the upper main vibration-proof
mechanisms 22 are disposed at four locations on the flat surface
portion 17a of the machine beam 17 at predetermined intervals
along a longitudinal direction of the machine beam 17, and the
upper main vibration-proof mechanisms 22 extend in a rear
direction in Fig. 3. A number of locations where the upper main
vibration-proof mechanisms 22 are disposed is not limited to
four locations. A desired number of the upper main
vibration-proof mechanisms 22 is disposed on the flat surface
portion 17a of the machine beam 17 as required. Hereinafter,
the upper main vibration-proof mechanisms 22 disposed at four
locations are collectively called the upper main
vibration-proof mechanism 22.
[0022]
As illustrated in Fig. 3, the brake disk side bearing
stands 13b supported on the flat surface portion 16a of the
machine base 16 are disposed at two locations on right and left
sides, and in Fig. 3, a slashed portion between these two brake
disk side bearing stands 13b is recessed. Fig. 3 illustrates
a housing (frame) storing (including) the hoisting machine 4
and exemplifies a case where the driving shaft 14 is disposed
at a center as indicated by unevenness on the frame, and four
15
brakes 15 are disposed on an outer side in a diameter direction
of the driving shaft 14 and mutually separated in a
circumferential direction.
[0023]
As illustrated in Fig. 2, a lower portion of the machine
beam 17 is fixed to an upper end of the leg portion 23 by a bolt
25d. A lower end of the leg portion 23 is placed on and fixed
to the base 26 via a supporting steel plate 24a, a
vibration-proof rubber 24b, a supporting steel plate 24c, a
fixing steel plate 24d, and bolts 25a, 25b, and 25c (Fig. 3).
Further, the leg portion 23, the supporting steel plate 24a,
the vibration-proof rubber 24b, the supporting steel plate 24c,
the fixing steel plate 24d, the bolts 25a, 25b, and 25c (Fig.
3), and the base 26 are included in a lower main vibration-proof
mechanism 24 to suppress that vibration by the hoisting machine
4 is propagated to a building. An elastic modulus of the
vibration-proof rubber 24b is set to a value appropriate to
prevent vibration propagation to the building. Further, the
supporting steel plate 24c, the fixing steel plate 24d, and the
vibration-proof rubber 24b are integrated by crimping. In
addition, as illustrated in Fig. 2, the base 26 is a housing
in which the leg portion 23 is erected. The base 26 is fixed
on a floor surface forming the machine room 3 and made of concrete
by a mounting bracket 32 and a bolt 33. A bracket material 30a
is attached to the base 26 by a bolt 31a. As illustrated in
16
Fig. 3, an opening is provided on a floor surface of the machine
room 3 made of concrete. One end of the opening is connected
to an upper end of the elevator car 8, and the main rope 5 wound
around the sheave 11 included in the hoisting machine 4 can pass
through the opening. In addition, similarly, an opening is
provided on the floor surface of the machine room 3 made of
concrete. One end of the opening is connected to an upper end
of the balance weight 7, and the hanging main rope 5 can pass
through the opening via the warped pulley 6.
[0024]
According to the embodiment, vibration generated when
the hoisting machine 4 is driven is suppressed by the upper main
vibration-proof mechanism 22 and the lower main vibration-proof
mechanism 24, and the vibration is not propagated to a building.
The upper main vibration-proof mechanism 22 includes the
supporting steel plate 22a, the vibration-proof rubber 22b, and
the fixing steel plate 22c. The lower main vibration-proof
mechanism 24 includes the leg portion 23, the base 26, the
supporting steel plate 24a, the vibration-proof rubber 24b, the
supporting steel plate 24c, the fixing steel plate 24d, and the
bolts 25a, 25b, and 25c. In the embodiment, a performance to
prevent that vibration by the hoisting machine 4 is propagated
to a building is a primary vibration-proof performance in a
vibration-proof mechanism.
[0025]
17
Here, a plurality of vibration modes, specifically, a
plurality of vibration modes including upper/lower resonance
vibration caused by a natural frequency of the hoisting machine
4 will be described. A case where the above-described upper
main vibration-proof mechanism 22 and the lower main
vibration-proof mechanism 24 are included as a vibration-proof
mechanism will be assumed and described below.
A natural frequency of the hoisting machine 4 and a
plurality of the vibration modes caused by resonance has the
following relation. A horizontal vibration mode < a yawing mode
< a pitching mode (an electric motor side) < pitching mode (a
brake side) Specifically, the natural frequency in vibration
by the hoisting machine 4 is a several Hz. However, as the
natural frequency increases, the vibration mode shifts to the
horizontal vibration mode, the yawing mode, the pitching mode
(an electric motor side), and the pitching mode (a brake side).
[0026]
The horizontal vibration mode is a mode in which vibration
is generated in a horizontal surface which is vertical to the
driving shaft 14 included in the hoisting machine 4 illustrated
in Fig. 2 and in which the driving shaft 14 is disposed.
Specifically, the horizontal vibration mode is a mode in which
the hoisting machine 4 vibrates on the front side and the back
side along the depth direction in Fig. 2. In the horizontal
vibration mode, a primary vibration-proof performance of a
18
vibration-proof rubber which prevents that vibration by the
hoisting machine 4 is propagated to a building can be achieved
by the upper main vibration-proof mechanism 22 and the lower
main vibration-proof mechanism 24.
The yawing mode is a vibration mode in which the hoisting
machine 4 illustrated in Fig. 2 is rotated around a center line
of the hoisting machine 4 viewed from an upper surface. In the
yawing mode, the primary vibration-proof performance can be
achieved by the upper main vibration-proof mechanism 22 and the
lower main vibration-proof mechanism 24.
[0027]
The pitching mode (an electric motor side) will be
descried with reference to Fig. 4. Fig. 4 is a side view
illustrating a vibration state in the pitching mode (an electric
motor side) of the hoisting machine 4 including the upper main
vibration-proof mechanism 22 and the lower main vibration-proof
mechanism 24 as a vibration-proof mechanism. As illustrated
in Fig. 4, when a vibration mode reaches the pitching mode (an
electric motor side), the hoisting machine 4 vibrates
counterclockwise in an arc shape around the center of gravity
(indicated by a black dot in Fig. 4) of the sheave 11 included
in the hoisting machine 4 when viewed from a side surface of
the hoisting machine 4. In other words, the whole of the
hoisting machine 4 vibrates alternatively such that, when the
electric motor 10 side moves downward, the brake 15 side moves
19
upward, and when the electric motor 10 side moves upward, the
brake side moves downward. In the pitching mode (an electric
motor side), it is difficult to achieve the primary
vibration-proof performance by the upper main vibration-proof
mechanism 22 and the lower main vibration-proof mechanism 24.
As a result, vibration by the hoisting machine 4 is propagated
to a building.
[0028]
In addition, the pitching mode (a brake side) will be
descried with reference to Fig. 5. Fig. 5 is a side view
illustrating a vibration state in the pitching mode (a brake
side) of the hoisting machine 4 including the upper main
vibration-proof mechanism 22 and the lower main vibration-proof
mechanism 24 as a vibration-proof mechanism. As illustrated
in Fig. 5, when a vibration mode is shifted from the pitching
mode (an electric motor side) to the pitching mode (a brake
side), the hoisting machine 4 vibrates clockwise in an arc shape
around the center of gravity (indicated by a black dot in Fig.
4) of the sheave 11 included in the hoisting machine 4 when viewed
from a side surface of the hoisting machine 4, and also the
machine beam 17 vibrates in a horizontal direction (right and
left). In the pitching mode (a brake motor side), it is
difficult to achieve the primary vibration-proof performance
by the upper main vibration-proof mechanism 22 and the lower
20
main vibration-proof mechanism 24. As a result, vibration by
the hoisting machine 4 is propagated to a building.
[0029]
As described above, in general, upper/lower vibration
generated when the hoisting machine 4 is generated is absorbed
by the upper main vibration-proof mechanism 22 and the lower
main vibration-proof mechanism 24, and therefore, the
upper/lower vibration is suppressed and is not propagated to
a building. Specifically, the primary vibration-proof
performance can be achieved. In addition, generally,
horizontal vibration generated when the hoisting machine 4 is
driven is not an issue from the viewpoint of the propagation
from a floor surface of the machine room 3 to a floor surface
of a guest room or a living room located in a building.
However, in the pitching mode (an electric motor side)
and the pitching mode (a brake side), the above-described
upper/lower resonance vibration generated by rotation in an arc
shape around the center of gravity of the sheave 11 included
in the hoisting machine 4 is not easily suppressed by the upper
main vibration-proof mechanism 22 and the lower main
vibration-proof mechanism 24.
[0030]
In Fig. 2, according to the embodiment, the bracket
material 30a is disposed to the base 26 via the bolt 31a, and
an upper end side of the bracket material 30a is connected to
21
the leg portion 23 via a supporting steel plate 30b, a
vibration-proof rubber 30c, a supporting steel plate 30d, and
the bolts 31b and 31c. The leg portion 23, the base 26, the
bolt 31a, the bracket material 30a, the supporting steel plate
30b, the vibration-proof rubber 30c, the supporting steel plate
30d, and the bolts 31b and 31c are included in an upper/lower
vibration-proof mechanism 30 which suppresses the
above-described upper/lower resonance vibration generated in
the hoisting machine 4. An elastic modulus of the
vibration-proof rubber 30c is set to an appropriate value to
prevent the upper/lower resonance vibration. Further, the
supporting steel plates 30b and 30d and the vibration-proof
rubber 30c are integrated by crimping. As described above, by
including the upper/lower vibration-proof mechanism 30
including the leg portion 23, the base 26, the bolt 31a, the
bracket material 30a, the supporting steel plate 30b, the
vibration-proof rubber 30c, the supporting steel plate 30d, and
the bolts 31b and 31c, the upper/lower vibration-proof mechanism
30 suppresses upper/lower resonance vibration generated when
a rotational frequency of the sheave 11 is increased and
coincides with a natural frequency of the hoisting machine 4.
In the embodiment, a performance to suppress upper/lower
resonance vibration generated in the hoisting machine 4 is a
secondary vibration-proof performance in a vibration-proof
mechanism.
22
[0031]
In the embodiment, both of the upper main vibration-proof
mechanism 22 and the lower main vibration-proof mechanism 24
are included. However, the both of them may not be necessarily
included, and either of the upper main vibration-proof mechanism
22 or the lower main vibration-proof mechanism 24 may be
included. Even in this case, the primary vibration-proof
performance can be achieved.
[0032]
Further, in the case where the base 26 is not disposed,
the bracket material 30a included in the upper/lower
vibration-proof mechanism 30 is fastened and fixed on a floor
surface of the machine room 3 by the bolt 31a.
[0033]
As described above, according to the embodiment, with
no effect on the primary vibration-proof performance of a
vibration-proof mechanism, upper/lower resonance vibration
generated in the hoisting machine can be certainly suppressed
with a simple structure. Further, according to the embodiment,
by providing each of the upper main vibration-proof mechanism
22, the lower main vibration-proof mechanism 24, and the
upper/lower vibration-proof mechanism 30, a conventional
vibration-proof rubber having a complicated structure is not
needed. Therefore, costs can be reduced.
[0034]
23
Further, when the upper/lower vibration-proof mechanism
30 includes the leg portion 23, the bracket material 30a, and
the vibration-proof rubber 30c, upper/lower resonance
vibration can be effectively suppressed. In such a case, an
upper end of the leg portion 23 is fixed to a lower portion of
the machine beam 17, and a lower end is fixed to the base 26,
one end of the bracket material 30a is connected to the leg
portion 23, and another end is fixed to the base 26, and the
vibration-proof rubber 30c is interposed between one end of the
bracket material 30a and the leg portion 23. Specifically,
upper/lower resonance vibration generated in the hoisting
machine 4 appears in the leg portion 23 supporting the hoisting
machine 4, and by suppressing swing of the leg portion 23,
vibration of the hoisting machine 4 disposed on an upper portion
of the leg portion 23 can be suppressed.
[0035]
Furthermore, when the lower main vibration-proof
mechanism 24 including the leg portion 23, the supporting steel
plate 24a, the vibration-proof rubber 24b, the supporting steel
plate 24c, the fixing steel plates 24d, 25a, 25b, and 25c, and
the base 26 are disposed between the leg portion 23 and the base
26, and main vibration-proof mechanisms are provided at both
of an upper portion and a lower portion of hoisting machine
supporting structure, it can be more certainly prevented that
vibration in the hoisting machine 4 is propagated to a building.
24
Further, by providing the base 26 which is a housing
supporting the leg portion 23, the leg portion 23 can be firmly
elected, and a vibration-proof performance can be improved.
Second Embodiment
[0036]
Fig. 6 is a side surface view illustrating a configuration
and a supporting structure of a hoisting machine according to
another embodiment of the present invention. Fig. 7 is an
elevation view illustrating the supporting structure of the
hoisting machine when viewed from the A direction in Fig. 6.
In the embodiment, in addition to the configuration of the
above-described first embodiment, an upper horizontal
vibration-proof mechanism and a lower horizontal
vibration-proof mechanism are further included. The other
points are same as in the first embodiment. In Figs. 6 and 7,
components same as in the first embodiment are denoted by the
same reference signs, and a description described in the first
embodiment will be omitted below.
[0037]
As illustrated in Figs. 6 and 7, a bracket material 40a
is attached on a flat surface portion 17a of a machine beam 17.
A side surface of the bracket material 40a is connected to a
lower end of a machine base 16 via a supporting steel plate 40b,
a vibration-proof rubber 40c, a supporting steel plate 40d, and
25
an arm 42. The bracket material 40a, the supporting steel plate
40b, the vibration-proof rubber 40c, the supporting steel plate
40d, and the arm 42 are included in an upper horizontal
vibration-proof mechanism 40 which suppresses horizontal
resonance vibration generated in the hoisting machine 4. An
elastic modulus of the vibration-proof rubber 40c is set to an
appropriate value to prevent horizontal resonance vibration.
Further, the supporting steel plates 40b and 40d and the
vibration-proof rubber 40c are integrated by crimping. One end
of the arm 42 is fixed to the supporting steel plate 40d, and
another end is interposed between a lower end of the machine
base 16 and a supporting steel plate 22a.
[0038]
In addition, as illustrated in Fig. 7, a lower end of
the bracket material 50a is disposed on a side surface of a base
26 by a bolt 51a. An upper end of the bracket material 50a is
connected to a leg portion 23 via a supporting steel plate 50b,
a vibration-proof rubber 50c, a supporting steel plate 50d, and
bolts 51b and 51c. The leg portion 23, the base 26, the bracket
material 50a, the bolt 51a, the supporting steel plate 50b, the
vibration-proof rubber 50c, the supporting steel plate 50d, and
bolts 51b, and 51c are included in a lower horizontal
vibration-proof mechanism 50 which suppresses horizontal
resonance vibration generated in a hoisting machine 4. An
elastic modulus of the vibration-proof rubber 50c is set to an
26
appropriate value to prevent horizontal resonance vibration.
Further, the supporting steel plates 50b and 50d and the
vibration-proof rubber 50c are integrated by crimping.
[0039]
According to the embodiment, vibration generated when
the hoisting machine 4 is driven is suppressed by an upper main
vibration-proof mechanism 22 and a lower main vibration-proof
mechanism 24, and the vibration is not propagated to a building.
The upper main vibration-proof mechanism 22 includes the
supporting steel plate 22a, a vibration-proof rubber 22b, and
a fixing steel plate 22c. The lower main vibration-proof
mechanism 24 includes the leg portion 23, the base 26, the
supporting steel plate 24a, the vibration-proof rubber 24b, the
supporting steel plate 24c, the fixing steel plate 24d, and the
bolts 25a, 25b, and 25c. Specifically, the primary
vibration-proof performance in a vibration-proof mechanism can
be achieved by the upper main vibration-proof mechanism 22 and
the lower main vibration-proof mechanism 24.
[0040]
Further, upper/lower resonance vibration generated when
a rotational frequency of a sheave 11 increases and coincides
with a natural frequency of the hoisting machine 4 is mainly
suppressed by an upper/lower vibration-proof mechanism 30 which
has been described in the first embodiment and includes the leg
portion 23, the base 26, a bolt 31a, a bracket material 30a,
27
a supporting steel plate 30b, a vibration-proof rubber 30c, the
supporting steel plate 30d, and bolts 31b and 31c. Furthermore,
horizontal resonance vibration generated when a rotational
frequency of the sheave 11 increases and coincides with a natural
frequency of the hoisting machine 4 is mainly suppressed by an
upper horizontal vibration-proof mechanism 40 and a lower
horizontal vibration-proof mechanism 50. The upper horizontal
vibration-proof mechanism 40 includes the bracket material 40a,
the supporting steel plate 40b, the vibration-proof rubber 40c,
the supporting steel plate 40d, and the arm 42. The lower
horizontal vibration-proof mechanism 50 includes the leg
portion 23, the base 26, the bracket material 50a, the bolts
51a, the supporting steel plate 50b, the vibration-proof rubber
50c, the supporting steel plate 50d, and the bolts 51b and 51c.
Specifically, resonance vibration in a plurality of the
above-described modes generated in the hoisting machine 4 in
response to rotation increase of the sheave 11 is suppressed
by combination of the upper/lower vibration-proof mechanism 30,
the upper horizontal vibration-proof mechanism 40, and the lower
horizontal vibration-proof mechanism 50. In the embodiment,
a performance to suppress upper/lower resonance vibration and
horizontal resonance vibration generated in the hoisting
machine 4 is a secondary vibration-proof performance in a
vibration-proof mechanism.
[0041]
28
The same material and the same elastic modulus are used
in the vibration-proof rubber 30c included in the upper/lower
vibration-proof mechanism 30, the vibration-proof rubber 40c
included in the upper horizontal vibration-proof mechanism 40,
and the vibration-proof rubber 50c included in the lower
horizontal vibration-proof mechanism 50. However, the elastic
modulus is not necessarily the same. For example, in a pitching
mode (an electric motor side) and a pitching mode (a brake side)
in a plurality of vibration modes caused by a natural frequency
and resonance of the hoisting machine 4, the Young’s modulus
of a vibration-proof rubber disposed where a distance from the
center of gravity (a black dot in Fig. 4) of the sheave 11 included
in the hoisting machine 4 is large may be large (the elastic
modulus: small). This is because a moment increases as a
distance from the center of gravity of the sheave 11 included
in the hoisting machine 4 increases during upper/lower resonance
vibration, and therefore it is preferable from the viewpoint
of vibration suppression to increase the Young’s modulus and
increase rigidity.
[0042]
In the embodiment, both of the upper main vibration-proof
mechanism 22 and the lower main vibration-proof mechanism 24
are included. However, the both of them may not be necessarily
included, and either of the upper main vibration-proof mechanism
22 or the lower main vibration-proof mechanism 24 may be
29
included. Even in this case, the primary vibration-proof
performance can be achieved.
Further, in the case where the base 26 is not disposed,
the bracket material 30a included in the upper/lower
vibration-proof mechanism 30 is fastened and fixed on a floor
surface of the machine room 3 by the bolt 31a.
[0043]
According to the embodiment, in addition to effects in
the first embodiment, the upper horizontal vibration-proof
mechanism 40 and the lower horizontal vibration-proof mechanism
50 are provided to suppress horizontal resonance vibration
generated in the hoisting machine 4, each elastic modulus of
the vibration-proof rubber 22b included in the upper main
vibration-proof mechanism 22 and the vibration-proof rubber 24b
included in the lower main vibration-proof mechanism 24 is
optimized for suppressing vibration propagation, an elastic
modulus of the vibration-proof rubber 30c included in the
upper/lower vibration-proof mechanism 30 is optimized for
suppressing upper/lower resonance vibration, each elastic
modulus of the vibration-proof rubber 40c included in the upper
horizontal vibration-proof mechanism 40 and the
vibration-proof rubber 50c of the lower horizontal
vibration-proof mechanism 50 is optimized for suppressing
horizontal resonance vibration, and consequently a secondary
vibration-proof performance to suppress upper/lower resonance
30
vibration and horizontal resonance vibration in the hoisting
machine 4 while maintaining the primary vibration-proof
performance of a main vibration-proof mechanism.
[0044]
Further, by providing each of the upper main
vibration-proof mechanism 22, the lower main vibration-proof
mechanism 24, the upper/lower vibration-proof mechanism 30, the
upper horizontal vibration-proof mechanism 40, and the lower
horizontal vibration-proof mechanism 50, a conventional
vibration-proof rubber having a complicated structure is not
needed. Therefore, costs can be reduced.
[0045]
The present invention is not limited to the
above-described embodiments and includes various variations.
For example, the above-described embodiments describe the
present invention in detail for clarification, and every
configurations described above may not be necessarily included.
31
We claim:
1. An elevator apparatus, comprising:
an elevator car and a balance weight which move up and
down in a hoistway formed in a building;
a main rope configured to suspend the elevator car and
the balance weight;
a hoisting machine including a sheave around which the
main rope is wound;
a machine base configured to support the hoisting
machine; and
a machine beam disposed at a lower portion of the machine
base,
the elevator apparatus further comprising:
a main vibration-proof mechanism disposed between the
machine base and the machine beam and/or between the machine
beam and the building side and configured to suppress that
vibration by the hoisting machine is propagated to the building;
and
an upper/lower vibration-proof mechanism at least
comprising a first elastic body disposed between the machine
beam and the building side and configured to suppress
upper/lower resonance vibration generated on the hoisting
machine.
32
2. The elevator apparatus according to claim 1, wherein
the upper/lower vibration-proof mechanism comprises:
a leg portion of which an upper end is fixed to a lower
portion of the machine beam, and a lower end is fixed on the
building side;
a first bracket material of which one end is connected
to the leg portion, and another end is fixed on the building
side; and
the first elastic body interposed between one end of the
first bracket material and the leg portion.
3. The elevator apparatus according to claim 2,
comprising an upper horizontal vibration-proof mechanism
configured to suppress a horizontal resonance vibration
generated on the hoisting machine,
the upper horizontal vibration-proof mechanism,
comprising:
a second bracket material of which one end is connected
to an arm extending to an outer side from a lower surface of
the machine base, and another end is fixed on an upper surface
of the machine beam; and
a second elastic body interposed between one end of the
second bracket material and the arm extending to the outer side
from the lower surface of the machine base.
4. The elevator apparatus according to claim 3,
comprising a lower horizontal vibration-proof mechanism
33
configured to suppress horizontal resonance vibration
generated on the hoisting machine,
the lower horizontal vibration-proof mechanism,
comprising:
a base of which an upper surface is connected to another
end of the first bracket material and a lower surface is fixed
to the building;
a third bracket material of which one end is connected
to the leg portion, and another end is fixed to the base; and
a third elastic body interposed between one end of the
third bracket material and the leg portion.
5. The elevator apparatus according to claim 2, wherein
the main vibration-proof mechanism is disposed between a lower
surface of the machine base and an upper surface of the machine
beam and comprises an upper main vibration-proof mechanism
configured to suppress that vibration generated by the hoisting
machine is propagated to the building.
6. The elevator apparatus according to claim 4, wherein
the main vibration-proof mechanism is disposed between a lower
surface of the machine base and an upper surface of the machine
beam and comprises an upper main vibration-proof mechanism
configured to suppress that vibration generated by the hoisting
machine is propagated to the building.
7. The elevator apparatus according to claim 5, wherein
the main vibration-proof mechanism is disposed between a lower
34
surface of the machine beam and the building side and comprises
a lower main vibration-proof mechanism configured to suppress
that vibration generated by the hoisting machine is propagated
to the building.
8. The elevator apparatus according to claim 6, wherein
the main vibration-proof mechanism is disposed between a lower
surface of the leg portion and an upper surface of the base and
comprises a lower main vibration-proof mechanism configured to
suppress that vibration generated by the hoisting machine is
propagated to the building.
9. The elevator apparatus according to claim 6, wherein
the Young's modulus of each of the first elastic body and the
third elastic body is larger than the Young's modulus of the
second elastic body.
10. The elevator apparatus according to claim 8, wherein
the Young's modulus of each of the first elastic body and the
third elastic body is larger than the Young's modulus of the
second elastic body.