JPS584203A - Vibration resistant type hanger - 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 a vibration-resistant hanging tool used when hanging equipment such as a lighting fixture from a member that vibrates frequently.

Continuous vibrations are applied to beams to which equipment such as cranes and core bearings are attached, or in the vicinity thereof. Therefore, when suspending equipment from such a location, it is necessary to prevent vibrations from being transmitted to the equipment, but this generally depends on the natural frequency of the equipment and the materials used to hang the equipment. A method is used to prevent resonance by shifting the vibration frequency. Figure 1 shows an example of this. A hanging bar (1) that passes through the bottom plate (4) of the
) is installed at the upper end of the hanging pipe (1) and the hanging pipe (1) with a coil spring interposed between the original flange part (6) and the bottom plate part (4).
The load of the equipment attached to 1 is transferred to the main body (
2).

By the way, there are the following problems with "K". Namely, the natural frequency changes depending on the weight of the hanging equipment, and the vibration at each vibration location is a combination of lucky frequencies and is never constant. The natural frequency must be determined according to the vibration frequency of the component to be attached and the weight of the equipment to be suspended.However, in the conventional example shown in Fig. 1, the material, diameter, wire diameter, This means that it was not possible to set a natural frequency different from the vibration frequency without preparing multiple coil springs with different numbers of turns.

The present invention has been made in view of these points, and its purpose is to provide a vibration-resistant hanging tool that can easily adjust the natural frequency, that is, the vibration frequency that can be absorbed. There is K.

The present invention will be explained in detail below based on illustrated embodiments. FIG. 2 shows the basic concept of an embodiment of the present invention, in which a cylindrical body is provided with a rubber-based elastic material (3), and the elastic material (3) extends from the bottom end. Hanging vise (1) with equipment (6) attached
is hanging. And external force from the outer peripheral surface of the elastic material (3) toward the center? elastic material (31
The elastic modulus changes as the volume changes. Since a change in the elastic modulus results in a change in the natural frequency, the volume of the elastic material (3) is changed so that the natural frequency deviates from the vibration frequency of the installation location. ) As shown in Fig. 4, one way to change the volume by applying pressure from the outer circumferential surface of the hanging bar (11) is to use an elastic material ($1) with the upper end of the hanging bar (11) fixed in the center and a truncated cone with a smaller diameter at the bottom. A plurality of slide fittings (7) are attached to the outer circumferential surface along the generatrix as a shape, and as shown in Fig. S, a conical cylindrical cup (
3) and the suppression fittings (8).
) so that the upper end of each slide bar A (7) can be pushed along the inner surface of the cup (9). When the suppression fitting (81) is tightened and the slide fitting (pin) is pushed in, the elastic material (3) is pushed downwards where the diameter of the cup (-) is small, causing a volume change and changing the elastic modulus.
・K to change the volume of the elastic material (3)
Instead of applying pressure from the outer peripheral surface of 3), pressure may be applied from both end faces in the axial direction. Figure 6 shows an example of this, in which a plurality of screws are connected from the bottom plate (4) of the main body to the elastic material (31), which is a rectangular metal fitting placed on the upper surface of the elastic material (1). screws (11)
Other embodiments and examples are shown in FIG. 6 and below, in which the volume of the elastic material (1) is unified by tightening. This uses a coil spring like the conventional example, but is different in that the coil spring in this example is an elastic material whose elastic modulus (spring constant) is variable. That is, the body (
In order to do this, screw together the adjustment link A, lock both ends of the fill spring to the bottom plate part (4) of the main body (!) and the adjustment ring Ij (11J), and attach the flange attached to the upper end of the hanging pipe (1). Part (I) is placed on the upper part of the coil spring through the opening window H in the center of the adjustment ring JjHl.This collar part (61 is fixed to the adjustment ring α4, and the adjustment link 6m When rotated, they rotate together, and the position where the flange 11i) rests on the coil is fixed so that it does not change.Also, when the load of the equipment is applied, the coil spring can be compressed. The engagement between the upper end of the coil spring and the adjusting ring (O-kun) is such that it can slide freely in the axial direction and has a large engagement depth l so that it will not come off even when the coil spring is compressed. Within the range of this retention depth I, the coil spring is
As shown in Figures (a) and C'b), when it is necessary to change the natural frequency of this vibration absorbing device, #
Adjustment ring J is done by inserting a jig into the hole 04 made in the adjustment ring Jj and rotating it relative to the main body (!1, and changing the diameter mainly of the coil spring). As a result of this adjustment, the coil spring whose upper end and lower end are engaged with the bottom plate (4) of the main body (2) is unwound or wound up, changing its diameter. The spring constant X of a coil spring is given by G(1'... (i) 8nD' where the transverse elastic modulus of the material is 01, the wire diameter is d1, the effective number of turns is n1, the diameter is D), and 9. From 1[!D, the spring constant X changes and the natural frequency also changes.In this case, as the radius decreases, the number of turns n increases, so the spring constant K Although the rate of change in The increase In of the number of turns n at the time is 0
．． 5. When the coil spring liD when free is 10 and the number of turns n when free is 5, the decrease in the diameter of the coil spring 1D
/ D = in, D/n = 0.5XIO/F
i = 1 Therefore, the ratio of the spring constant Kn when free and the spring constant Kt when torque is applied is given by equation (i) above.G d
'G (1'8X5X103°8XL5X9" Reduction rate of spring constant Kt/Kn=5.5×9315×1
0! The spring constant X changes by applying torque to the coil spring to change its diameter, such as 0.8 or more, but the adjustment ring rJtI can only be rotated relative to the main body Instead, the pitch of the liK coil is changed by applying torque to the coil, which is screwed together with the main body.The diameter of the coil is changed by changing the pitch of the coil, making it particularly small and absorbing vibrations. This is to prevent the range from becoming smaller.Now, adjust link + I
Assuming that the threading between the ll and the main body is a right-handed screw, the coil spring is a right-handed screw, and the pitches of both are approximately the same, then the adjustment link (when viewed from above, turn counterclockwise) If you turn it to
As the distance between the coil spring and the bottom plate portion (4) of the main body (2) increases, the diameter of the coil spring decreases while increasing the number of turns n. If the coil spring in the free state is in the state shown in Figure 9 (&), it will be as shown in Figure 9 (b) K.

By turning the adjusting link Jj (l) clockwise, the diameter of the coil spring increases, the number of turns n decreases, and the distance between the adjusting link H and the bottom plate part (4) of the main body becomes smaller. The result is as shown in Figure (e). In either case, the pitch P of the coil spring hardly changes. The same is true for left-handed threads and left-handed threads. - If the pitch P of - is large and a sufficient vibration absorption range can be secured even if the pitch P becomes a little small, the adjustment ring Ij (
The ItJ and the main body (2) may be screwed together with a right-handed thread, and the coil spring may be threaded with a left-handed thread. In this case, the rotation of the adjustment ring IjOe results in the rotation as shown in FIGS. 10(a) and 10(b). In addition, the adjustment ring O1l can be rotated at the same position without being screwed into the main body (2), and can be locked at any rotational position to prevent the adjustment ring O1l from returning due to the torque applied to the coil spring. ni-L is also acceptable. In this case, the change in pitch P is not as great as in the case shown in FIG. 1O.

As described above, in the present invention, the elastic modulus of the elastic material is variable, and the natural frequency can be changed depending on the vibration frequency of the vibrating place, the weight of the hanging equipment, etc. It is capable of absorbing vibrations under a wide range of vibration conditions without replacing other parts or parts.

[Brief explanation of drawings]

Figure 1 is a sectional view of the conventional example, Figure 2 (!L) (b) (0
) is a sectional view and a plan view showing an embodiment of the present invention, FIG. 3 is a sectional view showing a specific example of the same book, FIG. 4 is a perspective view, and FIG. 5 is a sectional view of another embodiment. FIG. 6 is a cutaway perspective view of still another embodiment, FIG. 7 is a partial perspective view, and FIG.
a) (b) is a cross-sectional view showing the vibration absorption effect, Fig. 9 (a)
) (→ (C) and Figure 1o (a)) are cross-sectional views showing the state in which the diameter of the coil spring is changed. Elastic material, - indicates a coil spring J Agent Patent Attorney Stone 1) Long 7th 311 8 Figure 5 1JI9 (0) Owa (b) (C) Nu σ1, ○th Jol
t (a) (b) ri ○ 6 0

Claims (1)

[Claims] (1) Equipment such as lighting equipment can be attached to the lower end by connecting the upper end of the extruded pipe to the main body, which is fixed to another member such as a beam or ceiling surface, via an elastic material. K: An am-resistant sling characterized by comprising an elastic modulus variable means for applying pressure or torque to the elastic material. The elastic material according to claim 1 is characterized in that the elastic material is a rubber-based elastic material, and the means for applying pressure to the elastic material to change the volume of the elastic material is an elastic modulus variable means. (3) The elastic material is a coil spring, and one end of the coil spring is locked to the main body, and the other end of the coil spring is locked and can be rotated relative to the main body to apply torque to the coil spring. 2. The vibration-resistant hanging tool according to claim 1, further comprising an elastic modulus variable means for changing the spring constant of the vibration-resistant hanging tool.