JPS60191982A - Support beam for winding machine of 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] [Technical Field of the Invention] This invention relates to a machine bed, an intermediate base, or a machine beam of a hoist that is installed in a machine room above an elevator hoistway and drives a car up and down via a rope. [Technical background of the invention and its problems] In general, hoisting elevators suffer from vibrations caused by the rotation of the motor of the hoisting machine, vibrations caused by reduction gears, electric control circuits, etc. Various types of vibrations were generated, and these vibrations could propagate to the living rooms and cages of the building, causing noise problems.

Therefore, as a countermeasure, it has conventionally been possible to suppress vibration propagation as much as possible by interposing vibration-proof rubber between the machine bed of the hoist and the intermediate base, and between the intermediate base and the machine beam.

Fig. 1 shows a line of vibration-proof rubber interposed between the hoisting machine 1, which consists of a motor 2 and a worm reducer 3, and a lobe 5 wrapped around a hoisting sheave 4 provided on its output shaft to drive the elevator downway. A car 6 and a counterweight 7 are suspended and driven up and down. Such a hoist I is mounted on a machine bed 8 in a machine room above the elevator hoistway, the machine bed 8 is supported on an intermediate pace 9, and its intermediate base 9 is supported on a machine beam 10 on the machine room floor. It is set up.

This alone will reduce the vibrations generated from the hoisting machine 1 (mechanical vibrations generated from the worm reducer 3 and rotational vibrations generated by the electromagnetic vibrations of the Ff Tsukuda control felling A motor 2) using a thyristor, etc. The machine bed 8 is propagated to the building frame via the machine bed 8, the intermediate base 9, and the machine beam IO, causing large noise in the living room.
and the intermediate base 9 and between the intermediate base 9 and the machine beam 10, vibration isolating rubbers 11 and 12f are provided respectively, and the vibration isolating rubbers 11 and 12 prevent vibrations from the hoisting machine 1 from the intermediate base 9. In addition to reducing the amount of vibration propagated to the machine beam 10, the amount of vibration propagated to the machine beam 10 is further reduced, and finally the amount of vibration propagated to the building frame is reduced, thereby reducing mold room noise.

By the way, the machine head 8 that supports the hoisting machine zl mentioned above
The intermediate heath 9 and machine beam 10 are usually made of channel steel, H-shaped steel, T-shaped steel, or steel plates bent into similar cross-sectional shapes. These will be collectively referred to as support beams below. Support beams made of such steel materials have countless natural frequencies as elastic bodies. Therefore, the frequency of vibration 1l-i that is usually generated from the hoisting machine 1 is
The range is from '50 H2 to 500 Hz 8 degrees, but if the support beam has a natural frequency close to this range, it will cause a resonance phenomenon and vibrate with an amplitude that is several times larger.

In other words, the channel steel 14 shown in FIGS. 2 and 3 serves as a support beam.
In terms of the sequence, it vibrates in the photographing mode shown by the phase image line, and this causes a resonance phenomenon with the photographing from the above-mentioned hoisting machine, increasing the vibration amplitude many times. As a result, as described above, even if the propagated vibrations are reduced by using vibration-proof rubber, the vibration noise cannot be reduced, and on the contrary, the noise may become worse.

Therefore, a support beam such as the channel steel 14 requires a structure that reduces the vibration of the support beam itself.

[Purpose of the invention]

This invention was made in view of the above circumstances, and the vibration amplitude does not increase due to the resonance phenomenon caused by the vibration from the hoisting machine, and the natural frequency of the hoisting machine changes, so the vibration can be extremely reduced. The purpose of the present invention is to provide a support beam that has excellent vibration isolation performance and is highly effective in preventing noise when used with the machine bed, intermediate base, or machine beam of a machine.

[Summary of the invention]

The support shaft for an elevator hoisting crosspiece of the present invention has a structure in which concrete is filled in the recess of a steel material with a grooved cross-sectional shape or an H-shaped cross section, and the overall damping capacity is significantly increased. In addition, the number of vibrations and noises is very low since it can eliminate the increase in vibration amplitude due to the resonance phenomenon with vibrations from the hoisting machine.

[Implementation sequence of the invention]

Hereinafter, one embodiment/7iIi column of the present invention will be explained with reference to FIGS. 4 and 5. The support beam illustrated here is an example in which channel steel or a steel material 24 formed by bending a steel plate into a groove shape is used, and as shown in FIG. It is installed and used as a bed, intermediate base, or machine beam with anti-vibration rubber interposed. The concavity IJ-) 25 is densely filled in the concave portion of the groove 24 over the entire direction of the hand. In order to withstand long-term use, the steel material 24 and the concrete 25 are tightened by tightening bolts 27 inserted into bolt holes penetrated at both ends and at multiple locations along the way by holding metal fittings 26 for preventing peeling. ing.

Further, FIGS. 6 and 7 show other embodiments of the present invention, and the support beam H1 section steel shown here, ? In the row using 4, this I-shaped steel material, ? Concrete I7-35 is filled in the upper and both sides of 40 in the same manner as described above, and the presser metal fittings 36 are tightened and fixed by bolts 37.

In the support beam having the above-mentioned configuration, the steel material 24.34 itself vibrates as an elastic body and has a small internal damping capacity, but as mentioned above, it is filled with concrete 25.35 to provide support. The damping capacity of the beam as a whole has become significantly larger, and the natural frequency of the elastic body has also changed. - For this reason, one of the excitation frequencies of the hoisting machine becomes the natural frequency of the support beam. Even if it is close, the damping ability is large, so the vibration will not be greatly expanded.

Furthermore, if the natural frequency of the steel materials 24 and 34 is close to the excitation frequency, the filling of the concrete 1,1-t 25135 changes the natural frequency and moves it away from the resonance point, so resonance phenomena can also be avoided. It becomes like this.

Therefore, if the support beam with the above-mentioned configuration is used for the machine bed, intermediate base, and machine beam shown in Figure 1, the damping capacity will resonate with the large beam against the vibration propagation from the hoisting machine, and the phenomenon will occur. Therefore, it is effective in improving the original vibration isolation performance.

In other words, Figure 8 shows the experimental results of the frequency characteristics of the support beam of the present invention filled with concrete and the conventional support beam not filled with concrete. While the peak value of 2 is high and sharp, as shown by the dotted line, the peak value of the support beam of the present invention is lower.

Therefore, when vibrations from the hoist are transmitted, the response vibration of the support beam of the present invention is extremely small. On the other hand, conventional support beams exhibit large response vibrations, giving the building heavy vibrations and noise.

Incidentally, filling with the concrete 25.35 can be easily carried out at a factory or at an installation site, and the cost is low in terms of both material costs and expenses.

〔Effect of the invention〕

Since this invention has been made as described above, if it is installed and used as a machine bed, intermediate base, or machine beam of a hoisting machine, the vibration amplitude will not increase due to resonance phenomenon due to vibrations from the hoisting machine, and on the contrary, Vibration damping ability is dog,
The response vibration is extremely reduced, and as a support beam for a hoisting machine, it has excellent vibration isolation performance and is highly effective in preventing vibration Ia noise.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the installation state of the hoisting machine of a general hoisting type elevator, and Figures 2 and 3 are conventional support beams used as the machine bed, intermediate base, or machine beam of the hoisting machine. 4 and 5 are a side view and an end view of a support beam showing a single BM row of the present invention,
6 and 7 are a side view and an end view of a support beam showing another embodiment of the present invention, and FIG. 8 is a vibration tube 0! of a support beam of the present invention and a conventional support beam. ! , is a comparative explanatory diagram showing numerical characteristics in a graph. 1... Hoisting machine, 2... Motor, 3... Worm reducer, 4... Hoisting sheep, 5... Warp, 6...
・Kaotsu 7... Counterweight, 8... Machine bed, 9... Intermediate base, lO... Machine beam, 11
．． 12... Anti-vibration rubber, 14, 24, ? 4.
...Steel, 25゜35...Concrete, 26,
, V 6... Presser fitting, 27 , , ? 7...Bolt. Applicant's representative Patent attorney Takeshi Suzue Syllable 1 figure 2 ri;-t: 3ba figure 4 figure 5 figure 6 figure 8 figure 0 Enoki shearing number -

Claims (1)

[Claims] Filling concrete into the recesses of the steel material in support beams made of steel material with a grooved or H-shaped cross section, used for machine heads, H intermediate heirs, machine beams, etc. of hoisting machines that drive elevator cars up and down. A support beam for an elevator hoisting machine, which is characterized by: