JPS5982289A - Machine base for elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a machine platform on which an elevator hoisting motor is supported.

The hoisting type 1jt11 which drives the elevator car is supported by a machine stand, which is installed on the floor of the machine room. This is shown in FIGS. 1 and 2.

In the figure, (1) is the elevator hoistway, and (2) is the hoistway (
1) is a machine room provided above; (2a) is a machine room provided above (2a);
) floor, (3) l'' are two supports made of H-shaped ropes laid on the floor (2a), (4) are both ends of beams (4a) made of H-shaped ropes. (5) A base supported on the bridge member (4a) via a vibration isolating rubber (6); (7) is the reducer installed on the base (5), (8) is the reducer (7)
) is coupled to the input shaft of the motor and is driven by variable voltage/variable frequency AC power supplied from a well-known inverter (not shown) made of semiconductors, (9)
OB is the driving sheave connected to the output shaft of the reducer (7), the deflection sheave pivotally supported on the base (5), and OB is the main rope wrapped around the sheave (9) and the deflection sheave 00. , 0→ is the main rope αB
OQ is a counterweight connected to the other end of the main rope.

With the configuration shown in FIG. 1, when the electric motor (8) is controlled by a semiconductor, electromagnetic imaging is generated. This electromagnetic vibration is transmitted to the beam (4a) via the anti-vibration rubber (6), but when the natural frequency of the beam (4a) matches the frequency of the electromagnetic vibration, the beam (4a) resonates. arise. In particular, when controlled by the variable voltage/variable frequency method described above, the frequency of electromagnetic imaging changes with the rotational speed of the electric motor (8), so when the car 02 accelerates or decelerates, the The resonance of the stand (4) is unavoidable.The -order resonance mode of the beam (4a) is as shown in Figure 2, and the vibration mode y is shown here. ) Amplitude at the center l: Length of the beam (4a) X: Distance from the end of the beam (4a)
Since it is close to the mounting position of the support (3), it will have a certain amplitude Y at the position of the support (3).

Therefore, large vibrations are applied to the support (3), and the vibrations are transmitted from the support (3) to the building.
Noise will be generated in the living room near the machine room (2), causing discomfort to the occupants.

This invention aims to improve the above-mentioned problem, and by setting the position of the support that supports the beam near the point that becomes the node of the photographing mode of the beam, it reduces the vibration transmitted to the building. It is an object of the present invention to provide an elevator machine platform that can suppress the generation of unpleasant noise.

An embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

In this example, the position of the support (3) is the beam (4a)
It is set at a distance of 0.2241 from the end. Other than this, it is the same as in FIG.

■ Find the distance X where y=o using the formula: X = 0.22
41. The support (
If 3) is set, the amplitude of the beam (4a) at the position of the support (3) is zero even if the beam (4a) is co-drained. Therefore, since vibrations are not transmitted to the building, no noise is generated in living rooms near the machine room (2).

Figure 4 shows the relationship between the setting position of the support (3) and the vibration transmitted to the building. Set position of support (3) to 0.151-0
．． 31! If it is between 1 and 2, the vibration transmitted to the building will be too large.

FIGS. 5 and 6 show other embodiments of the invention.

In the figure, Qi19 is a beam material (4a) consisting of multiple end plates.
This is a displacement body consisting of an additional mass disposed between the end of the support body (3) and attached to the keel (4a) by a bolt αη via a gripper θQ.

If the position of the support body (3) cannot be set to 0.2241 due to restrictions on the size of the machine room (2), etc., the position of the support body (3) can be set to 0.2241, and the beam material (
It is possible to displace the node A of the vibration mode of 4a) to be in the position of the support (3). The displacement body 0$ is composed of multiple pieces, and their positions are the gripping tools OQ and Pol) (
Since it can be changed by one force, it is easy to change the vibration mode of the beam (4a), and it is possible to accurately set the position of the support (3) as a node of vibration.

Figures '1 and 8 also show other embodiments of the invention.

In this embodiment, displacement bodies 0υ made of reinforcing members are fixed to both sides of the central part of the beam (4a) so that the set position of the support (3) becomes node A of the vibration mode. .

As is clear from the equation (2), the curvature of the vibration mode curve of the edge member (4a) is greatest at the center.

Therefore, if the displacement body α9 is mounted at the center, the vibration mode can be changed significantly with the minimum displacement body On.

As explained above, in this invention, an induction motor controlled by a semiconductor is installed, and the beam forming the f'Lfc machine stand is supported on the floor of the machine room by a support, and the position of this support is Since it is set near the node of the vibration mode of the material, even if electromagnetic vibration is generated from the electric motor due to semiconductor control, the vibration of the machine platform will be reduced and unpleasant noise generated in the building will be suppressed. I can do it.

In addition, since we have installed a displacement body on the support material that displaces the position of the node of the vibration mode, even if there are restrictions such as the size of the machine room, the position of the support can be accurately adjusted to the node of the vibration mode of the support material. can do.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of an elevator hoistway and a machine room, Fig. 2 is a front view showing a conventional elevator machine platform, and is a partial view of Fig. 1, and Fig. 3 is a longitudinal sectional view of an elevator machine platform according to the present invention. A front view showing one embodiment, Fig. 4, 1d, and a curve diagram showing the relationship between the position of the support body and vibration transmitted to the building in Fig. 3, and Fig. 5, a front view of a machine platform showing another embodiment of the present invention. , Fig. 6 is a left side view of the machine stand shown in Fig. 5, Fig. 7 is also a front view of the machine stand showing another embodiment of the present invention, and Fig. 8 is a sectional view taken along the line ■-■ in Fig. 7. be. (2a) -- Machine room floor, (3) -- Support, (4
)... Machine stand, (4a)... Beam material, (8)...
Induction electric motor (Incidentally, the same symbols in the figures indicate the same parts. Agent: Shin Kuzuno - (1 other person) Isui 11 [Figure 5 Figure 6

Claims (5)

[Claims] (1) An induction motor that is controlled by a semiconductor and drives a car is supported by horizontally placed beams, and this beam is
For those supported on the floor of the machine room by individual supports,
An elevator machine platform, characterized in that the position of the support body is set near a point that is a node of the vibration mode of the beam material. (2) The elevator machine platform according to claim 1, wherein the support body is positioned at a point 0.15 to 0.3 times the total length of the beam from the end of the beam. (3) The induction motor, which is controlled by a semiconductor and drives the car, is supported by horizontally placed beams, and this beam is
For those supported on the floor of the machine room by individual supports,
An elevator characterized in that a displacement body is attached to the beam to move the node of the vibration mode to position ff, and the position of the support is set near the node of the vibration mode of the beam. machine stand. (4) The elevator machine platform according to claim 3, wherein an additional mass is installed between the end of the beam and the support as a displacement body. (5) The elevator machine platform according to claim 3, wherein a reinforcing member is attached to the center of the keel as a displacement body.