JPH0469431A - Vibro-isolating supporter - Google Patents

Abstract

PURPOSE:To display vibro-isolating action relating to horizontal and vertical vibrations with a simple structure by forming a contact surface between a receiving seat and a slider into a tapered surface tilted downward toward the internal peripheral surface from the axial center of a cylindrical body. CONSTITUTION:A sliding surface 11 of a slider 9 is brought into slide contact with a lower surface of a slip plate 12 by fixing the stainless steel-made slip plate 12 to a lower surface of vibro-isolating floor 3 so that the slider 9 is smoothly slided by stable friction force relating to the slip plate 12 at the time of generating horizontal vibration. A mutual contact surface between a receiving seat 7 and the slider 9 is formed into tapered surfaces 14, 15 tilted downward toward an internal peripheral surface 8 from the axial center 0 of a cylindrical body 4. The slider 9 is equally distributively divided into a plurality of block units 9a to 9d along the peripheral direction of the slider. In this way, each block unit 9a to 9d of the slider 9 is slided to easily spread to the outside along the tapered surface 15 into contact with the receiving seat 7 and well pressed to the internal peripheral surface 8 of the cylindrical body 4 to improve vertical vibro-isolation when a vertical load is applied.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a vibration isolation support device, and particularly to an upper structure such as a floor on which WA equipment such as a combination machine, precision measuring equipment, and precision processing equipment is placed. Objects are supported horizontally and vertically on substructures such as foundations so that they can be displaced horizontally and vertically to prevent damage such as failure of equipment, overturning of equipment, and breakage of electrical wiring due to traffic vibrations and earthquake motion. This article relates to a vibration-proof support device that protects equipment from traffic vibrations and earthquake motion.

[Conventional technology]

Examples of anti-vibration support devices that protect equipment such as computers, precision measuring instruments, precision processing instruments, etc. from traffic vibrations and seismic motions include those that meet the following (ri) to (iv).

(i) The invention disclosed in Japanese Unexamined Patent Publication No. 47-35672 is an air spring incorporating a damping device consisting of a slider that is pressed against the upper part by a spring within a guide cylinder.

(ii) The invention disclosed in JP-A-54-52821 suspends a fishing bed from the upper floor of a building structure, and installs a horizontal damper between the fishing bed and the lower floor of the building structure. This is a vibration-proofing floor in which the fishing floor and the structure are elastically engaged in the horizontal direction.

(iii) The invention disclosed in JP-A No. 61-228138 is a coating of solid lubricant between a support plate fixed on a base plate and an upper plate placed on the support plate. This is a vibration isolating device in which an upper plate is slid horizontally on a support plate with a layer interposed therebetween, and the sliding movement of the upper plate is elastically damped by a dashpot and a spring between the base plate and the upper plate.

(iv) The invention disclosed in Japanese Patent Application Laid-Open No. 64-69842 places a base on rolling balls placed on a foundation floor,
This is a vibration isolator that provides horizontal vibration isolation using springs and viscous dampers between the foundation floor and the foundation, and vertical vibration isolation by placing the vibration isolation floor on the foundation via a laminated rubber structure and buffer damper. .

[Problem to be solved by the invention]

By the way, the various vibration isolating devices described in items N) to (iv) above have the following problems.

(i) The air spring disclosed in Japanese Unexamined Patent Publication No. 47-35672 exhibits a vibration damping effect due to friction against horizontal motion, but a damping effect is obtained in the vertical direction by combining the air spring and an orifice. Therefore, without the air spring, the damping effect in the vertical direction cannot be obtained.

(ii) The vibration-isolating floor disclosed in Japanese Patent Application Laid-Open No. 54-52821 has no vibration-isolating effect at all against vertical vibrations, and a separate horizontal damper must be installed for horizontal vibrations as well.

(iii) The vibration isolator disclosed in Japanese Patent Application Laid-open No. 61-228138 has a relatively simple structure, but the vibration isolating structure is only for horizontal vibration and has no vibration isolating effect against vertical vibration. .

(iv) The vibration isolator disclosed in Japanese Patent Application Laid-Open No. 64-69842 exhibits a vibration isolating effect against vertical and horizontal vibrations, but its structure is complicated, and because it absorbs vertical vibrations, Due to its physical limitations, it is difficult to design the laminated rubber structure to have a vertical natural frequency of 5 Hz or less, so it does not exhibit a vibration damping effect against the dominant frequency of 2 to 10 Hz caused by earthquake motion.

Therefore, the present invention was proposed in view of the above problems, and its purpose is to provide a vibration isolating support device that has a simple structure and can exhibit a vibration isolating effect against horizontal and vertical vibrations. It is in.

[Means to solve the problem]

Technical means for achieving the above object of the present invention include: a cylindrical body vertically disposed on a lower structure; a compression spring housed in the cylindrical body and erected on the lower structure; A seat is housed in the cylindrical body without contacting its inner peripheral surface and is placed on a compression spring, and a seat is fitted into the cylindrical body in sliding contact with the inner periphery of the cylindrical body so as to be slidable vertically. a slider placed on a catch and on the upper surface of which an upper structure is placed so as to be horizontally slidable; the mutual contact surface between the catch and the slider is
The tapered surface is inclined downward from the axial center of the cylindrical body toward the inner circumferential surface.

Furthermore, in order to improve the vibration damping effect in the vertical direction, it is desirable to divide the slider into a plurality of blocks along its circumferential direction.

[Effect]

In the anti-vibration support device according to the present invention, a vertical load acts on the slider, the seat, and the compression spring when cross-i11 vibration or earthquake motion occurs. The slider receives a vertical load due to input of vertical vibration, and at the same time receives a horizontal component of the vertical load on the Taber surface that contacts the seat, and slides in the vertical direction while being pressed against the cylindrical body. At this time, a vertical frictional force is generated by pressing the outer peripheral surface of the slider against the inner peripheral surface of the cylindrical body by the horizontal component force, and the vertical vibration is damped by this vertical frictional force. Also,
Due to the horizontal vibration input, the slider slides in the horizontal direction while being pressed by a vertical load on the upper surface that contacts the upper structure. At this time, a horizontal frictional force is generated by pressing the top surface of the slider against the bottom surface of the upper structure due to the vertical load, and this horizontal frictional force damps the horizontal vibration.

〔Example〕

An embodiment of the vibration isolating support device according to the present invention is shown in FIGS. 1 to 4.
This will be explained with reference to the figures. The embodiment shown in the figure shows a case where the vibration isolation support device of the present invention is applied to floor vibration isolation.

The anti-vibration support device (1) shown in Figures 1 and 2 consists of a concrete floor (2) which is a lower structure, a computer, w
It is installed between it and the vibration-proof floor (3), which is the upper structure on which equipment such as high-density measurement equipment and precision processing equipment is placed. In this anti-vibration support device (1), (4) is a cylindrical body with a circular cross section that is vertically installed on the concrete floor (2) by screws or the like via a metal mounting seat (5) made of stainless steel or the like. ,
It is preferably made of a hard material such as metal so that it does not deform even when external forces such as traffic vibrations and earthquake vibrations act on it.

(6) is housed in the cylindrical body (4) and the concrete floor (
2) A compression spring installed upright on the vibration-proof floor (3) can be used as a double coil spring (6a) (6b) as shown in the diagram depending on the load of the equipment placed on the vibration-proof floor (3), or other Coil springs and rubber springs are used. In addition, since the dominant frequency of earthquake motion is between 2 and 10)1z, the vertical natural frequency is 1
．． It is desirable to design the frequency to be 5 Hz or less. (
7 is a catch seat that is housed in the cylindrical body (4) without contacting its inner peripheral surface (8) and placed on the compression spring (6), and is made of a hard material such as metal or hard plastic. Become. (
9) is a slider that is fitted into the cylindrical body (4) so as to be slidably vertically in sliding contact with the inner peripheral surface (8) of the cylindrical body (4) and placed on the catch seat (7). ) and is elastically deformable, such as medium-hard rubber, or soft plastics such as polyurethane and nylon, preferably having a hardness (Hs) of about 70 to 90. In addition, the slider (9) includes a sliding surface (10) that comes into sliding contact with the outer circumferential surface of the slider (9), that is, the inner circumferential surface (8) of the cylindrical body (4), and the upper surface of the slider (9), that is, the vibration-proofing surface (described later). The sliding board on the floor (3) (
12) The sliding surface (11) in contact with the lower surface (13) is
The sliding surface (10) of the slider (8) may have a composite structure made of different materials, such as urethane, nylon, or Teflon, and the inside made of rubber.
(11) is desirably made of a material with good wear resistance and a stable coefficient of friction l1M% On the other hand, the inner peripheral surface (8) of the cylindrical body (4) also resists vertical vibration. It is desirable to appropriately finish the sliding surface (10) of the slider (8) so that a stable frictional force is generated. In addition, by fixing a maintenance-free stainless steel sliding plate (12) to the bottom surface of the vibration-proof floor (3), a slider (9) is installed.
) is brought into sliding contact with the lower surface (13) of the sliding plate (12), so that when horizontal vibration occurs, the slider (9) slides smoothly against the dipping plate (12) with stable frictional force. I try to make it slide smoothly.

However, if the lower surface of the vibration-proof floor (3) itself is a smooth surface, the sliding plate (12) is not necessarily required.

A feature of the present invention is that the mutual contact surface between the catch seat (7) and the slider (9) is
Tapered surface that slopes downward toward (14) (15)
The reason is that Further, the slider (9) has a plurality of (four in the figure) block bodies (9a) along its circumferential direction.
~(9d) are equally distributed. As a result, each block body (9a) of the slider (9) when a vertical load is applied.
(9d) slides outward along the tapered surface (15) in contact with the catch seat (7) and spreads easily.
a) to (9d) are well pressed against the inner circumferential surface (8) of the cylindrical body (4), thereby improving vertical vibration isolation.

Figure 83 shows an example of floor vibration isolation construction in which the vibration isolation support device (1) having the above structure is applied to a part of a building. In this construction example, multiple vibration isolation support devices are installed on a concrete floor (2). (1
)(1)- is installed, and the vibration-proof floor (3) is placed on top of it. The planar arrangement pattern of the vibration isolation support device <1)(1)-m- is designed based on the vertical load distribution based on the arrangement of equipment placed on the vibration isolation floor (3). The vibration-proof floor above (
3) and the concrete floor (2), springs (16) (16)- with a predetermined tensile force applied are installed horizontally to prevent input of horizontal vibrations caused by traffic vibrations and earthquake motions. The shaking bed (3) is restored to its initial position. A gap is provided between the vibration-isolating floor (3) and the surrounding wall surface (17) so that the vibration-isolating floor (3) can move due to input of horizontal vibration. Wall surface (17
) A bellows (18) is stretched between the holes to close the gap.

The above-mentioned floor vibration isolation structure is designed to allow three-dimensional movement of about ±100 days with vertical vibrations of about 1.5 Hz and ±200 days of horizontal vibration with horizontal vibrations of about 0.5 to 1.5 FIz, for example. Ru.

Next, we will discuss the anti-vibration support device (1
) operation is explained below.

In the anti-vibration support device (1) shown in Figures 1 and 2, the slider (9) slides in the vertical direction relative to the cylindrical body (4) when subjected to horizontal and vertical vibrations due to traffic vibration or earthquake motion. It also slides in the horizontal direction with respect to the sliding plate (12).

To explain specifically, first, as shown in FIG. 4, due to the input of horizontal vibration, the slider (9) slides in the horizontal direction while being pressed against the sliding plate (12) under the vertical load W. . At this time, the slider (9
) pressing the sliding surface (11) of the sliding plate (12) against the lower surface (13) of the sliding plate (12) generates a horizontal frictional force Fh-W·μ.

This horizontal frictional force Fh quickly damps horizontal vibrations. In this case, the horizontal frictional force Fh depends on the combination of materials of the slider (9) and the sliding plate (12), but the friction coefficient μ
A sufficiently stable product with a value of about 0.05 to 0.5 can be obtained.

In addition, the compression spring (6) is displaced by the input of vertical vibration and tries to hold the vibration-isolating floor (3) in a stationary state, but in reality, the vibration-isolating floor (3) has a response (transient) vibration. Occur.

Therefore, it is necessary to reduce response vibrations 1 and 2 as much as possible. The slider (9) receives vertical load W due to input of vertical vibration.
, the vertical load W along the tapered surface (15) of the slider (9) is P 1 = Wcos (90°−
θ°) and P 2 = along the normal direction of the tapered surface (15)
It is divided into W cos θ°, which causes the vertical load W
A horizontal component force f=P2cos (90°-θ°) is generated. The slider (9) receives the vertical load MW, and at the same time receives the horizontal component force f of the vertical load W on the tapered surface (15) in contact with the catch seat (7), and is pressed against the cylindrical body (4) while moving vertically. slide in the direction. At this time, a vertical frictional force is generated by pressing the sliding surface (10) of the slider (9) against the inner circumferential surface (8) of the cylindrical body (4) by the horizontal component force f. To quickly damp vibrations, that is, response vibrations.

Here, if the angle θ° formed by the tapered surface (15) of the slider (9) that contacts the seat (7) is designed to be 45°, then
The vertical frictional force FV is maximum and is 1/2 of the horizontal frictional force Fh.
becomes. In general, in earthquake motion, vertical vibration is 1/1/1 of horizontal vibration.
2, the angle θ formed by the tapered surface (15)
If the angle is designed to be 45 degrees, a good damping effect can be obtained in both the vertical and horizontal directions. If the ratio of vertical vibration to horizontal vibration due to seismic motion is different from the above case, the angle θ° formed by the tapered surface (15) may be changed in design according to the ratio, that is, the vertical vibration is 1/2 of horizontal vibration
If the angle θ of the tapered surface (15) is smaller than
If the vertical vibration is larger than 1/2 of the horizontal vibration, the coefficient of friction on the sliding surface (11) which is the upper surface of the slider (9) may be made smaller or larger than 45°. Either μ may be decreased, or the friction coefficient μ on the sliding surface (lO), which is the outer peripheral surface of the slider (9), may be increased.

The setting of the coefficient of friction μ on the sliding surfaces (10) (11) can be changed by changing the material of the slider (9), or by bonding another member to its upper surface or outer peripheral surface.

In addition, in order to obtain a good damping effect against large-amplitude traffic vibrations and earthquake motions, a slider (9 sliding surfaces (10) (1
If the friction coefficient μ in step 1) is designed to be large, or for some other reason, the sliding surfaces (10) and (11) of the slider (9) may become in close contact with each other, making the slider (9) unable to slide. In some cases, the slider (9) does not slide due to minute amplitude traffic vibrations or earthquake motions, but in that case, the slider (9) absorbs the minute vibrations through its elastic deformation, so that the desired result cannot be achieved. Provides anti-vibration effect.

〔Effect of the invention〕

According to the vibration isolating support device according to the present invention, the compression spring, the catch, and the slider are stored and arranged in a stacked state in the cylindrical body, and the contact surface between the catch and the slider is made into a tapered surface, thereby reducing traffic vibration. When an earthquake occurs, the slider is made to slide vertically against the cylindrical body with a predetermined vertical frictional force, and to slide horizontally with a predetermined horizontal frictional force against the upper structure. Therefore, a good damping effect against vertical and horizontal vibrations can be obtained with a simple structure, and its practical value is great. Moreover, if the slider is divided into a plurality of blocks along its circumferential direction, the vertical vibration isolation properties can be further improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the vibration isolating support device according to the present invention, FIG. 2 is a sectional view taken along line rr in FIG. 1, and FIG. 3 is the vibration isolating support device in FIG. 1. Figure 4 is a front view showing a construction example of floor vibration isolation applied to a part of a building. FIG. 3 is an enlarged cross-sectional view of main parts. (1-Vibration isolation support device, (2-Substructure vA (concrete floor), (3-Superstructure vJ (vibration isolation floor), (4-Cylindrical body, (6)-Compression spring, (7-Socket ,
(8)-inner peripheral surface, (9-slider, (9a) to (9b) block body, contact surface (tapered surface).

Claims (2)

[Claims] (1) A cylindrical body vertically installed on the lower structure, a compression spring housed in the cylindrical body and erected on the lower structure, and a compression spring installed inside the cylindrical body in a non-contact state with the inner circumferential surface of the cylindrical body. The seat is housed and placed on the compression spring, and the cylindrical body is fitted into the cylindrical body so as to be slidable in the vertical direction while being in sliding contact with the inner peripheral surface thereof, and is placed on the catch, and the upper structure is attached to the top surface. It consists of a slider on which an object is placed so that it can slide freely in the horizontal direction, and the mutual contact surface between the catch seat and the slider is a tapered surface that slopes downward from the axial center of the cylindrical body toward the inner circumferential surface. An anti-vibration support device characterized by: (2) A vibration isolating support device, characterized in that the slider according to claim (1) is divided into a plurality of blocks along its circumferential direction.