JP4964504B2 - Passenger conveyor - Google Patents

Description

  The present invention relates to a passenger conveyor, and more particularly to a passenger conveyor in which noise reduction measures are taken against noise generated from a machine room of the passenger conveyor.

  In conventional passenger conveyors with low noise, for example, a noise absorbing material is attached to the back side of the floor board directly above the driving machine, which is the main noise source, thereby insulating the noise transmitted through the floor board and reducing the noise (for example, patents) Reference 1).

Japanese Patent Laid-Open No. 06-255968

  However, the sound from the drive is not always transmitted only from the floor plate directly above, and since the machine room of the passenger conveyor is generally not sealed, the sound insulation effect is limited. On the other hand, in the vicinity of the drive mechanism, which is the noise source to which the sound absorbing material should be attached, the space between the step reversing part and the floor board is extremely small, so a sufficient amount of sound absorbing material is attached to the floor board, etc. It is difficult to take measures to reduce noise. In addition to the original floorboard, a sound-absorbing material and a structure for mounting the sound-absorbing material are required, which increases costs including maintenance.

  Accordingly, an object of the present invention is to provide a passenger conveyor that does not require a large space and has a large sound absorbing effect while having a simple structure.

  The passenger conveyor of the present invention includes a Helmholtz resonator that is provided on a floor board of a landing and attenuates a noise frequency component to be attenuated among noises in a machine room, and the resonator is fixed to the floor board and is attached to the floor board. And a first plate member having a plurality of apertures that communicate with the resonance portion and become neck portions.

  A Helmholtz resonator can be constructed by performing simple processing on the back of the floor board, and the main auditory noise frequency component can be sound-insulated, and the noise level of the passenger conveyor can be effectively reduced.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a configuration around a machine room of a passenger conveyor according to the present invention. 2 is a cross-sectional view of the floor board structure shown in FIG. 1, and FIG. 3 is a perspective view of the floor board structure as seen from the back surface, which is the lower surface of FIG.

  In FIG. 1, a passenger conveyor includes a frame 1, a drive unit 2 that is supported by the frame 1 and combined with a motor and a speed reducer, and a chain that is supported by the frame 1 and wound around the drive unit 2. And an endless belt-like series of treads 3 that are driven by (not shown) and circulate between the two landings. A box-shaped portion of the frame 1 that houses the driving machine 2 and serves as a place for the passenger conveyor is a machine room 4. A floor board structure 5 for the landing is provided at the top of the machine room 4 and covers the machine room 4. When the passenger conveyor operates, noises of various frequency components such as operation sounds from the drive unit 2, running sounds of steps, and noises from the chain are generated. This noise can be frequency-analyzed by measurement, and a frequency with a high noise level can be specified by measurement.

  According to the present invention, in order to attenuate this noise, the floor structure 5 of the landing is, as best shown in FIG. 2, provided on the lower surface of the floor board 6 by appropriate fixing means such as welding, screws or fixing brackets. A first plate member 7 and a second plate member 8 which are superposed and fixed are provided. An anti-slip 9 is provided on the upper surface of the floor board 6. The first plate member 7 has a plate thickness ta, and is provided with a large number of circular first apertures 11 having a diameter a, and the second plate member 8 has a plate thickness tb, The same number of second apertures 12 with a diameter b are provided coaxially with the apertures 11. Since the first opening 11 and the second opening 12 communicate with each other, and the diameter b of the second opening 12 is larger than the diameter a of the first opening 11, FIG. As shown in the figure, a Helmholtz resonator 15 that includes a neck portion 13 (cross-sectional area S) and a resonance portion 14 (volume V) and that attenuates noise frequency components to be attenuated among noises in the machine room 4 is provided. become.

  In other words, the Helmholtz resonator 15 is fixed to the floor plate 6 to form the resonance portion 14 with the floor plate 6, and has a plurality of apertures 11 that communicate with the resonance portion 14 and become the neck portion 13. The plate member 7 is provided. Further, a flat second plate member 8 having a second opening 12 larger than the first opening 11 is provided between the first plate member 7 and the floor plate 6. A resonance portion 14 is formed by the opening 12 of the second plate member 8.

FIG. 6 is a sectional view showing the configuration of a Helmholtz resonator 15 that is generally used for noise countermeasures. At this time, the Helmholtz resonator 15 has a coefficient related to the length of the neck 13 as 1 and the sectional area of the neck 13. If S is S, the volume of the resonance portion 14 is V, and the sound speed is c, it is known that there is a sound absorbing effect on the frequency f represented by the following equation (1).

f = (c / 2π) √ (S / 1V) (1)

The floor plate 6 of the passenger conveyor according to this embodiment has a structure in which two plate members 7 and 8 having openings 11 and 12 having different diameters are overlapped as shown in FIG. The first plate member 7 has a first opening 11 as a neck portion 13 and a second plate 12 as a second layer 12 as a next layer as a resonance portion 14. By setting the diameters a and b, it is possible to configure the Helmholtz resonator 15 having a sound absorbing effect with respect to the frequency obtained by the equation (1). Specifically, the diameter of the first opening of the first plate member 7 on the machine room side is a, the plate thickness is ta, the diameter of the second opening 12 of the second plate member 8 is b, When the plate thickness is tb, each variable shown in the equation (1) is

S = π (a / 2) ² (2)

V = tb · π (b / 2) ² (3)

It is possible to obtain the dimensions of each part for constituting the Helmholtz resonator 15 having a sound absorbing effect with respect to the frequency at which the noise level is desired to be reduced.

  If an example of the dimension in the case of a general escalator is given, board thickness ta (neck part length) of the 1st board member 7, board thickness tb (volume depth) of the 2nd board member 8, and opening 11 When the diameter a (neck part diameter) is 5 mm and the attenuation target frequency f is 350 Hz, 117 mm is appropriate as the diameter b (volume diameter) of the second opening 12 of the second plate member 8.

  Thus, according to the passenger conveyor of the present invention, the Helmholtz resonator 15 that is provided on the floor board 6 of the landing and attenuates the noise frequency component to be attenuated among the noises in the machine room 4 is fixed to the floor board 6. A resonance portion 14 is formed between the floor plate 6 and a first plate member 7 having a plurality of first apertures 11 communicating with the resonance portion 14 and serving as a neck portion 13 is provided. Also provided with a flat second plate member 8 provided between the first plate member 7 and the floor plate 6 and having a second opening 12 having a diameter larger than that of the first opening 11. it can. For this reason, it is possible to secure the strength with a structure in which simple processed plates are stacked instead of conventional reinforcing plates without increasing the number of special parts such as soundproofing materials and sound absorbing materials. The noise level of the frequency component of noise can be lowered.

Embodiment 2. FIG.
FIG. 4 is a perspective view similar to FIG. 3 showing another passenger conveyor floor board structure 16 of the present invention. The floor structure 16 of the passenger conveyor includes a floor panel 6 and a plate member 18 that is fixed to the floor panel 6 in order to maintain the rigidity of the floor panel 6, and is processed into a groove portion having a substantially U-shaped cross section by bending. I have. A flange portion 19 is provided at an open end portion having a U-shaped cross section. The flange portion 19 is fixed to the floor plate 6 by welding or the like, and the groove shape portion is a resonance portion 14 of the Helmholtz resonator 15 ( 6), and the opening 11 provided in the bottom wall portion of the groove-shaped portion constitutes the neck portion 13 (FIG. 6) of the Helmholtz resonator 15 (FIG. 6).

  In the illustrated example, the plate members 18 are each independently a groove-shaped member fixed to the floor plate 6, and also act as a reinforcing member for the floor plate 6. Alternatively, a single continuous plate member 18 can be folded in a zigzag manner and used as a continuous groove portion. The plate member 18 having a groove-shaped portion is attached to the back surface of the floor plate 6 by adhesion means (not shown) such as adhesion, welding, or bolting, and the U-shaped convex portion of the plate member 18 and the back surface of the floor plate 6 are connected to each other. A closed space that becomes the Helmholtz resonator 15 resonance portion 14 is formed between them. Since the openings 11 are provided at regular intervals on the convex surface of the groove portion of the plate member 18, the opening 11 is used as the neck portion 13, and the convex portion of the groove portion of the plate member 18 and the back surface of the floor plate 6. A Helmholtz resonator 15 having a resonance portion 14 as a space formed therebetween is configured. In this case, the capacity of the resonance portion 14 is determined by the height between the U-shaped convex portion and the interval between the apertures 11, and by appropriately setting the diameter of the aperture 11 and the interval between the apertures 11, a plurality of frequencies can be obtained. A sound absorption effect can be obtained for the components.

  According to this passenger conveyor, the conventional cross-sectional shape of the U-shaped reinforcing plate is simply drilled to form the opening 11 to ensure strength while also ensuring hearing. Therefore, it is possible to reduce the noise level of the frequency component of the noise that is a problem, and to use or share the reinforcing plate.

Embodiment 3 FIG.
FIG. 5 is a perspective view of another passenger conveyor floor board structure 20 according to the present invention as seen from the back side similar to FIG. When this floor board structure 20 is compared with the floor board structure 5 of FIG. 3, it is different in that a sound absorbing sheet 21 that absorbs noise is provided between the floor board 6 and the two first and second plate members 7 and 8. is doing. The sound-absorbing sheet 21 may be a well-known sheet of sound-absorbing material that is used for general purposes, and other structures are the same as those shown in FIGS.

  In this passenger conveyor, a sound absorbing sheet 21 is provided on the back surface of the floor plate 6, and first and second plate members 7 and 8 having the same structure as that shown in FIG. 15 is constituted.

  Thus, the overall noise level can be reduced with respect to a certain range of frequencies by the sound absorbing material, and a particularly high level frequency component can be absorbed by the Helmholtz resonator, thereby obtaining a great effect for lower noise. be able to. In addition, it has a structure that simply stacks processed plates instead of conventional reinforcing plates without increasing the number of special parts such as soundproofing materials and sound absorbing materials. The noise level of the frequency component can be reduced.

It is a perspective view around the machine room of a passenger conveyor showing one embodiment of the present invention. It is sectional drawing which shows the detail of the floor board structure of FIG. It is a perspective view of the floor board structure of FIG. It is a perspective view which shows the floor-plate structure of another passenger conveyor of this invention. It is a perspective view which shows the floor-plate structure of another passenger conveyor of this invention. It is a schematic sectional drawing which shows the structure of a Helmholtz resonator.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Frame, 2 Drive machine, 3 Step board, 4 Machine room, 5 Floor board structure, 6 Floor board, 7 1st board member, 8 2nd board member, 11, 12 Opening, 13 Neck part, 14 Resonance part, 15 Helmholtz resonator, 16 floor plate structure, 18 plate member, 19 flange part, 20 floor plate structure, 21 sound absorbing sheet, a diameter, b diameter, f frequency, S cross-sectional area, ta plate thickness, tb plate thickness, V volume.

Claims (2)

Are found provided on landing floor plate, provided with a Helmholtz resonator for attenuating noise frequency component to be attenuated of the noise of the machine room,
The Helmholtz resonator includes a first plate member and a second plate member,
The first plate member has a first hole serving as a neck,
The second plate member is provided between the floor plate and the first plate member, and has a second hole serving as a resonance portion between the floor plate and the first plate member. And
The second hole communicates with the first hole and has a larger diameter than the first hole.
A passenger conveyor characterized by that. Said provided between the second plate member and the floor plate, according to claim 1 Symbol placement of the passenger conveyor, characterized in that it comprises a sound-absorbing sheet for absorbing noise.

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