JPS60143239A - Vibration preventing bed - Google Patents

Abstract

PURPOSE:To facilitate the alteration of characteristic-frequency and the adjustment of horizontality by constructing a vibration preventing rubber member capable of changing the mounting angle to adjust the spring constant vertically and horizontally. CONSTITUTION:Between upper and lower frame beds 7, 8 are disposed in parallel two vibration preventing rubber members 10a, 10b through upper face plates 16a, 16b at the upper end and lower ones 20a, 20b under the vertically upstanding condition. Screw shafts 30, 40 are pivotably mounted on the lower frame bed 8 while being screwed respectively in the lower face plates 20a, 20b. And by rotating the respective screw shafts 30, 40 can be moved the vibration preventing rubber members 10a, 10b away from or toward each other through the lower face plates 20a, 20b by same distance and said shafts 30, 40 can be slanted to each other by the same angle.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vibration isolating stand, and particularly relates to at least two vibration isolating rubber members between an upper stand on which a vibration generating machine is mounted and a lower stand placed on a support. By arranging them as a unit and tilting at least one of the upper end and the lower end of each vibration isolating rubber member at the same angle in the direction of separating or approaching each other, the natural frequency of the vibration isolating table can be changed and installed. This makes it easy to adjust the levelness during inspection.

Generally, for the purpose of preventing the vibrations of vibration-generating machines such as compactors and presses from being transmitted to supports such as floors,
A vibration isolating table using a vibration isolating rubber member is used. As shown in FIG. 1, this type of vibration isolating table consists of two pedestals 2 on which the vibration generating machine 1 is placed and a lower pedestal 4 placed on the floor (support) 5. However, it is known that conventional vibration isolating tables have the following drawbacks due to the characteristics of the vibration isolating rubber members. It is being

The spring constant of the anti-vibration rubber member is almost constant, so if the weight of the vibration-producing machine changes, the natural frequency that affects the vibration transmission rate to the support will change, making it impossible to obtain an appropriate anti-vibration effect. In order to change the natural frequency to the required value, it is necessary to replace the vibration-proof rubber member with one having a spring constant corresponding to the MEt fluctuation. Natural frequency fn, spring constant K (Kf/cm).

There is a relationship between the weight W (K) and the following equation (1).

Here, 2 is the acceleration of gravity (980 an/sec). Therefore, for example, if the weight of the vibration generating machine becomes lighter, the natural frequency will increase, but if you want to lower the natural frequency, the resiliency constant This means that a vibration-proof rubber member with a small size must be used.

In addition, when installing a vibration-generating machine, the distance between the center of gravity of the machine and the support point of the vibration isolator (the additional issue position on the anti-vibration rubber part side) is often not constant, and each support point Since the load borne by the anti-vibration rubber parts differs, there is a difference in the amount of deflection, causing the machine to tilt. For this reason, it is necessary to adjust the horizontality by jacking up the vibration isolator on the side with the most deflection and inserting a spacer, commonly known as a liner, between the bottom surface of the machine and the top surface of the upper mount of the vibration isolator. be. In this case, the vibration isolating rubber member on the side where the vibration isolating table is jacked up will be in a no-load state, but the vibration isolating rubber member on the opposite side will have no load because the center of gravity of the machine moves in the direction of the machine. As it increases, the deflection becomes thicker. The deflection of the anti-vibration rubber when it is loaded and unloaded has the characteristics shown in Figure 2, so it is possible to prevent the deflection from increasing from δl to δ2 when the load increases from Wl to W2. Even if the load on the swinging rubber is returned to Wl, the deflection does not return to δl immediately, and a larger deflection of Δχ than δl remains, and then, as time passes, the deflection becomes δ1. However, since a considerable amount of time is required during this time, adjusting the levelness by adjusting the levelness by adjusting the levelness requires troublesome work and time.

Furthermore, in machines such as high-speed presses that rotate at variable speeds and whose vibration frequency changes, if the rotational speed of the machine and the natural frequency of the vibration isolation table match, a resonance phenomenon will occur, causing large vibrations in the machine. However, in the conventional vibration isolation table, the natural frequency cannot be changed, so the resonance phenomenon of the machine cannot be avoided, and the usable rotational speed range is therefore limited.

This invention solves the above-mentioned drawbacks by having a structure in which the angle of the vibration-proof rubber part can be changed and adjusting the spring constant in the vertical and horizontal directions. The purpose of the present invention is to provide a vibration isolation table whose natural frequency can be easily changed and whose horizontality does not require much effort.

That is, as shown in the embodiments and drawings described later, this invention provides at least two anti-vibration rubber units between an upper pedestal 7 on which the vibration generating machine 1 is mounted and a lower pedestal 8 placed on the support 5. The members 10a and 10b are arranged as a unit,
The upper ends of the vibration isolating rubber members 10λ, 10b are connected to the upper surface plate 16al16b arranged on the lower surface of the upper mount 7, and the lower ends are connected to the lower mount 8.
Rotating members 13a, 13b, 15a, 15b; 18a are provided on the lower plates 20a, 20b arranged on the upper surface of the , respectively.

18b, 22a, and 22b, and at least one of the upper surface plates 16a, 16b and the lower surface plates 20a, 20b is moved the same distance in a direction in which the vibration-proof rubber members are moved away from or close to each other in synchronization with each other. Mechanism 26a+26
b+30, 40t50 are provided, and the vibration isolating rubber members are tilted at the same angle with respect to the vertical direction via the moving mechanism.

Embodiments of the present invention will be described below with reference to the drawings.

3 to 5 show an actual M1.1 example of the present invention, FIG. 3 is a front view, FIG. 4 is a view taken along line A-A in FIG. 1 (partially omitted), Figure 5 is a one-law surface diagram.

In the above figure, reference numeral 7 denotes an upper frame, on which the legs 6 of the vibration generating machine are mounted and fixed with bolts and nuts (not shown). Reference numeral 8 denotes a lower pedestal, which is installed 16" into the soil of the support 5 such as the floor surface. Between the upper pedestal 7 and the lower pedestal 8, there are two vibration-proof rubber parts arranged in parallel. AA10a and 10b are the top plate 16a at the upper end,
16b and the bottom plates 20a and 20b at the lower end, it is disposed in a vertically erected state.

The anti-vibration rubber parts 11oa and iob are provided with fasteners 12a and i2b on two sides of the solid or hollow anti-vibration rubber parts 11a and 11b.
However, the lower metal fittings 14a and 14b are vulcanized and bonded to the lower surface, respectively, and the upper surface and lower metal fittings of the fastening metal fittings 12a and 12b are connected to each other.
Anti-vibration rubber members 10a, 10 are provided on the lower surfaces of 14a, 14b.
grooves 13a, 13b;
5a and 15b are formed.

The upper plates 16a and 16b are rectangular substrates 17a and 1γ.
The vibration isolating rubber member 10a is provided on the lower surface of b.

Protrusions 18a, 18 that are approximately semi-cylindrical with the same radius of curvature as the grooves 13a, 13b of the IQbO upper fittings 12a, 12b.
b is provided with this protrusion 18a.

18b is fitted into the grooves 13a, 13bK of the stoppers 12a, 12b of the anti-vibration rubber part +J' 10a, 10b, and the substrates 17a, Ilb are placed on the upper stand 7.
Tighten the bolts to secure the V.

The lower plates 20a, 20b are rectangular substrates 21a, 21.
The anti-vibration rubber member 10a is provided on the upper surface of b.

IOB lower fittings 14a, 14b grooves 15a, 15b
Protrusion 2 formed into an almost semi-cylindrical body with the same radius of curvature as
2a and 22b are provided, and the protrusions 22A and 22b are placed on the upper surface of the lower pedestal 8 with the protrusions 22A and 22b fitted into the grooves 15a and 15b of the lower fittings 14B and 14b of the vibration isolating rubber members 10a and 10b. ing.

The lower pedestal 8 has two guide members 2 parallel to the straight line iL connecting the centers of the vibration isolating rubber members 10a and 10b.
5 is provided in sliding contact with the 1) 1'' surface and rear surface of the lower plates 20a' and 20b.

In addition, screw shafts 30 and 40, which are integrally connected by a connecting shaft 50, are arranged in parallel to the straight line on the lower pedestal 8,
The small diameter portion 31 on the end side of the screw shaft 30 is rotatably supported on the bearing 35, the small diameter portion 41 on the end side of the screw shaft 40 is rotatably supported on the bearing 45, and the connecting shaft 50 is rotatably supported on the bearing 55. It is.

The screw shaft 30 has a right-hand threaded portion 33, and the screw foot 40 has a left-hand threaded portion 43, each having the same pitch.
Take the other end of the connecting member 26a screwed onto the right-hand threaded portion 33 of the screw shaft 30 to one of the bottom plates 20a via a bolt, and screw one end into the left-hand threaded portion 43 of the screw shaft 40. The other end of the joined connecting portion i' 25b is attached to the other bottom plate 20b via a bolt.

The screw shaft 30.40 has a small diameter portion 31.41 and a prismatic portion 32.42 that protrudes outward from the bearings 35, 45. The connecting member 2 screwed onto the screw shaft 30 by rotating the
6a and a connecting member 26b screwed onto the screw shaft 40, move the same distance in the direction of separation or proximity, respectively, and connect the bottom plates 20a, 20 via the connecting members 26a, 26b.
b are guided by the guide member 25 on the lower pedestal 8'' so that they slide in a straight line 79 in opposite directions.

As shown in FIGS. 6 and 7, a flange 52 with a plurality of holes 51 drilled on the same circumference is attached to the connecting shaft 50 by welding. A hole 56 having a center on the same circumference as the hole 51 of the flange 52 passes through the end surface of the bearing 55 of 50. The hole 51 of the flange 52 and the hole 56 of the bearing 55 are a locking mechanism for preventing rotation of the screw shaft 30.40.
, the hole 51 of the flange 52 and the bearing 55 as shown in FIG.
The stopper pin 60 is inserted so as to be centered with the hole 56.

When operating the vibration isolating table having the above configuration, as shown in FIG. 30
．． Rotate 40. For example, when the handle 28 is rotated clockwise, the connecting portion 26a screwed into the right-hand threaded portion 33 of the screw shaft 30 moves rightward from the position shown in FIG. The combined connecting members 26b move leftward from the position shown in FIG.
The right-hand threaded portion 33 of the threaded shaft 30 and the threaded shaft 4
Since the pitch with the left-hand threaded portion 43 of 0 is the same, the moving distances of the connecting portion fd'26a and the connecting portion 26b are the same. As the connecting parts 'A')+' 26 a and 26 b move, the lower plates 20 a and 20 b connected to the connecting members 26 a and 26 b are guided by the guide member 25 and move along the lower pedestal 8 in a straight line L. (FIG. 4) by an equal distance in a direction that separates them from each other.

By separating the lower plates 20a and 20b from each other in a straight line, the lower plate 20 is placed on the protrusions 18a and 18b of the upper plates 16a and 16b fixed to the upper frame 7 and the support 5.
The grooves 13a' and 13b of the fasteners 12a and 12b and the lower metal fitting i are attached to the protrusions 22a and 22b of the fasteners 12a and 12b, respectively.
4a, groove 15a of 14b.

The anti-vibration rubber member 10a is fitted with the anti-vibration rubber member 15b.

10b is a projection 18a of the top plate 16a, 16b.

isb and the protrusions 22a, 22b of the lower plates 20a, 20b to rotate, but since the upper surfaces 4i16a, 16b are fixed to the upper frame 1, the interval on the lower end side increases by a certain distance, and the It becomes a state where it is tilted by the same angle in the opposite direction from a state perpendicular to .

As described above, as the vibration-proof rubber members 10a and 10b incline, the upper pedestal 7 moves downward in parallel while maintaining a horizontal state.

By the above operation, the vibration isolating rubber members 10a and 10b are installed after adjusting the angles, and then
1 and the hole 56 of the bearing 55, insert the stopper 60,
Prevents accidental rotation of the screw shaft 30, 40.

To reduce the take-up angle τ1 of the anti-vibration rubber members 10a and 10b, it is sufficient to rotate the screw shafts 30 and 40 counterclockwise in the opposite direction to the above. moves upward while maintaining a horizontal state.

As mentioned above, when the vibration isolating rubber member is tilted I, the resiliency constant of the vibration isolating rubber often changes depending on the inclination angle.

In other words, the vertical and horizontal spring constants of one anti-vibration rubber are given by the following equations (2) and (3).

KZ””Kssinθ+KpOMθ (2)KY=K
S CO3θ + Kpsinθ (3) Here, Kz: Spring constant in the vertical direction after tilting KY: Spring constant in the horizontal direction after tilting KP: Number of spring legs in the vertical direction before tilting Ks: Horizontal before tilting In a unit that has two anti-vibration rubbers with a spring constant in the direction, these two
The spring constant K of the unit in the vertical direction and in the horizontal direction due to the difference in the inclination angle (σ0) when the vibration isolating rubber is tilted
Table 1 shows the changes in z' (=2Kz) and Ky' (-2Ky), assuming that the spring constant ratio (6 to Kp/) before tilting is 2 and 10.

Table 1 Therefore, by adjusting the mounting angle of the vibration isolating rubber member, the spring constant K in the above formula (1) can be changed.

In the vibration isolating table of the present invention, since the two vibration isolating rubber parts are tilted as a unit at the same angle in opposite directions as in the above embodiment, even if the vibration isolating rubber members are tilted, No horizontal force acts on the upper frame and the lower frame. Therefore, when multiple units of anti-vibration rubber members are installed, even if the inclination angles of the anti-vibration rubber members of each unit are not the same, the upper and lower mounts will not move relative to each other, and vibrations will occur. The center of gravity of the generating machine will not shift.

On the other hand, if one vibration isolating rubber member is moved too much, or two vibration isolating rubber parts are tilted in the same direction, horizontal force will act on the upper mount. A force is exerted to move the lower frame and the lower frame laterally. therefore,
When the above-mentioned anti-vibration rubber part A2 is arranged as a core unit, if the tilt angles of the anti-vibration rubber members of each unit are not the same, the upper mount and the lower mount will move relatively and vibration will occur. Since the center of gravity of the machine shifts, it becomes extremely difficult to adjust the pX inclination angle.

In the above embodiment, a case was described in which, of a pair of upper and lower plates, the upper plate is fixed and the lower plate is moved in the opposite direction on a straight line connecting the center of the anti-vibration rubber section. Contrary to this embodiment 11, the lower plate may be fixed and the upper plate may be moved, or the upper plate and the lower plate may be both moved in opposite directions.

In the above embodiment, a reverse screw mechanism is used as a mechanism for moving the lower plate, but instead of the reverse screw mechanism, for example, a fluid pressure cylinder or the like may be used.

Figures 10 and 11 show other embodiments of the present invention. In this embodiment, bearings 61a, 61b and bearings 52a, 52b are fixed to the stoppers 12IL, 12b and lower metal fittings 14a, 141) of the vibration-proof rubber members 10a, lOb, respectively, and the upper plates 16a, 16b and the lower plate 4ff120a ,
20b", two bearings 63a, 163b and bearings 64a, 64b are fixed respectively, and shafts 65a, 65b and shafts 66a, 66b are respectively inserted into the respective bearings, and the inclination ( It constitutes the rotating part at 1 o'clock.According to this actual MD example, the connection between the vibration isolating rubber part side and the top plate and bottom plate is strong, so it can be used as a vibration isolating table for machines that generate large vibrations. suitable.

In addition, in the above embodiment, the case where two anti-vibration rubber members were arranged as a unit was explained, but in addition, two
Two sets of anti-vibration rubber members are arranged on the same straight line, with each set of anti-vibration rubber members arranged as a unit. It is also possible to use a tilted configuration.

Further, in the present invention, three or more vibration-proof rubber parts can be arranged as a unit. In this case, for example,
Each anti-vibration rubber member is arranged in a 4-cylindrical shape at regular intervals, and the mechanism for moving the top plate and the bottom plate is to move each anti-vibration rubber member from the center connecting the centers of each anti-vibration rubber member. By moving the center of the member and the installation center by the same distance in the direction of separation or proximity in synchronization with each other on the straight line connecting the center of the member and the center of the installation, each vibration-proof rubber part 4o can be tilted at the same angle. It is possible to create a structure in which no horizontal component force is generated when the

Furthermore, the four anti-vibration rubber parts are arranged at equal or unequal intervals on the same circumference, or arranged at each m corner point of the trapezoid as a unit, and each anti-vibration It is also possible to adopt a configuration in which two of the rubber members are glued together and are tilted at the same angle in opposite directions from the center of the arrangement or the center of the trapezoid.

As described above, in the present invention, the horizontal component force is The number and positional relationship of the vibration isolating combs on the vibration isolating comb portion side are not limited to those of the above-mentioned embodiments.

As mentioned above, the present invention provides at least two anti-vibration rubber members arranged as a unit, and both or one of the upper end and the lower end of each anti-vibration rubber part are spaced apart from each other or The spring constant is changed by moving in the direction of proximity and adjusting the mounting angle. Therefore, according to the present invention, even if the weight of the vibration generating machine changes, the required natural frequency can be changed without replacing the vibration isolating rubber section. Further, according to the present invention, even when adjusting the levelness of the vibration isolating table, the vibration isolating rubber member can be attached by adjusting the angle, and the upper frame can be moved in parallel in the vertical direction. It is no longer necessary to use jacks to insert the spacer as in the past, and the effort required when installing the vibration isolating table can be greatly simplified. Furthermore, according to the present invention, even if the rotational speed of the vibration generating machine and the natural frequency of the vibration isolating table match and a resonance phenomenon occurs, [υi the natural frequency of the shaking table is changed to
Since it is possible to perform J processing, there is no restriction on the unusable rotation speed range.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional vibration isolator, Figure 2 is a load/deflection characteristic diagram of vibration isolator rubber, Figure 3 is a front view of an embodiment of the present invention, and Figure 4 is a Figure 5 is a 1il side view, Figures 6 to 8 are enlarged views of the bearing portion of the connecting shaft, Figure 9 is an enlarged view of the bearing part of the connecting shaft, respectively. 10 and 11 are a front view and a side view, respectively, showing other embodiments of the invention. Vibration generating machine, 5 is a support, 7 is a double pedestal, 8 is a lower pedestal, 10a and 10b are vibration-proofing gongs tc13a
, 13b is a groove on the upper end side of the vibration-proof rubber part in, 15a, 1
5b is a groove on the lower end side of the anti-vibration rubber layer; 16a and 116b are upper plates; 18a and 18b are protrusions of the upper plates; 20a and 20
b is the bottom plate, 22a, 22b are the protrusions of the bottom plate, 26a,
26b is a connecting member, 30.40 is a screw shaft, 50 is a connecting shaft, and L is a moving straight line of the lower plate. Patent Applicant Yokohama Rubber Co., Ltd. Representative Patent Attorney Tetsuya Mori Patent Attorney Yoshiaki Naito Patent Attorney Masami Shimizu Patent Attorney Hiroshi Kajiyama Figure 1 Figure 2 Figure 3 54C Figure 4

Claims (1)

[Claims] At least two vibration-proof rubber parts are arranged as a unit between the pedestal and the lower pedestal placed on the support, and the upper end of the vibration-proof rubber member is placed on the upper pedestal. The upper plate placed on the lower surface is connected to the lower plate whose lower end is placed on the soil surface of the lower mount via rotating members, and at least one of the upper plate and the lower plate is synchronized with each other. A mechanism is provided to move the anti-vibration rubber parts the same distance in a direction that is narrow or close to each other, and the anti-vibration rubber parts are tilted at the same angle to each other with respect to the vertical 1θ direction via the moving mechanism. A vibration isolation table characterized by: