JPH0547876Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a vibration-proof support device for supporting machinery such as a marine engine on a mounting base via an air spring.

[Conventional technology] Conventionally, main engines, auxiliary engines, reduction gears, etc. for ships, etc.
Anti-vibration rubber is generally used when machinery that generates vibrations during operation is used to prevent the vibrations from being transmitted directly to the installation base or ship's hull. As such prior art, for example, Japanese Utility Model Application Publication No. 61-152828 discloses a vibration-proof rubber anti-vibration support device for anti-vibration support for machinery such as a marine diesel engine on a machine installation base provided at the bottom of a ship. A device is described that reduces relatively low frequency vibrations by using a combination of an actuator and an actuator.

[Problem to be solved by the invention] When particularly high vibration isolation is required for so-called vibrating bodies such as main engines, auxiliary machines, and reduction gears for ships, conventionally used anti-vibration rubber is not suitable for anti-vibration. The effect is often insufficient, and even active vibration isolation support devices used in combination with actuators to compensate for this cannot be expected to be effective against medium to high frequency vibrations. Therefore, instead of the vibration isolating rubber, it may be possible to use an air spring (a cushion material that utilizes the elasticity of not only air but also compressed gas is collectively referred to as an air spring), which has a greater vibration damping effect. However, especially when using flexible air springs, the air that supports the supported objects such as machinery may The load acting on the spring changes, and the height of the air spring changes as the load changes. For example, when the ship is rocking,
The air spring on one side is compressed and the air spring on the other side is expanded, so the height of the air spring is lower on the compression side.
On the other hand, the opposite side becomes higher. Therefore, the supported body is inclined with respect to the installation base, and the relative position between the two changes.

On the other hand, the drive shaft of the screw connected to the main engine, etc. is supported in a fixed position by bearings installed at the bottom of the ship, so if the relative position of the supported object to the installation base changes, A problem arises in that misalignment occurs at the joints with other devices such as drive shafts connected to the body, which makes the use of air springs difficult.

This invention responds to load fluctuations that act on the air springs that support the supported object due to changes in external forces such as the rocking of a ship when a flexible air spring is used as a vibration-proof support member for the supported object. It is an object of the present invention to provide a vibration-proof support device that suppresses expansion and contraction of an air spring, keeps the height of the air spring constant, and always maintains a constant relative position of a supported body with respect to an installation base, and
Another object of the present invention is to provide a vibration isolating support device that can solve the problem of an extremely large installation space when providing a mechanism to keep the height of an air spring constant without impairing the vibration isolating effect. .

[Means for solving the problem] In order to achieve the above-mentioned purpose, in the present invention,
In a vibration-proof support device that supports a supported object such as machinery via an air spring arranged on a mounting base, the supported object is supported by a plurality of flexible air springs, and each air spring has: Flexible air springs for adjusting the height are arranged in communication with each other through a throttle hole, and an actuator is provided for changing the volume of the air spring for adjusting the height. In response to changes in the load applied to the air spring, pressurized air is supplied from the height adjustment air spring into the air spring through the actuator, or pressurized air inside the air spring is supplied to the height adjustment air spring. By discharging air and maintaining the height of each of the air springs constant, the relative position of the supported body with respect to the installation base is always constant.

In addition, if there is no installation space for an air spring height adjustment device or actuator below the installation stand for installing machinery, etc., the height adjustment air spring and the actuator may be moved away from the installation stand. The height adjusting air spring and the corresponding air spring can be connected by a communication pipe which also serves as a throttle hole.

Furthermore, by increasing the pressure receiving area of the height adjusting air spring and lowering the height of the air spring, the installation space can be reduced while obtaining the same vibration damping effect.

[Function] According to the vibration isolating support device of the present invention configured as described above, some of the plurality of flexible air springs interposed between the installation base and the supported object above the installation base can absorb external loads, etc. When the distance between the supported body and the installation base is reduced, for example, the actuator operates and compresses the flexible air spring for height adjustment, thereby removing the load from the air spring for height adjustment. Pressurized air is supplied to the air spring to increase the air volume within the air spring and to stretch the air spring to keep its height constant. Conversely, if another air spring out of the plurality is stretched by an external load and the distance between the supported object and the installation base increases, the actuator operates in the opposite direction, causing the air in the air spring to expand. is discharged into the height adjustment air spring to reduce the air volume within the air spring, compressing the air spring and keeping its height constant. In this way, the heights of the plurality of air springs interposed between the installation base and the supported body are kept constant, and the distance between the installation base and the supported body is always maintained constant. In addition, since each air spring and the height adjustment air spring are communicated through the throttle hole, even when a sudden large load change is applied to the air spring, this load change is caused by internal pressurized air as a medium. The vibration is transmitted to the air spring for height adjustment, and the volume of the air spring for height adjustment changes, effectively absorbing and attenuating the shock, and buffering sudden and large load fluctuations of the air spring, resulting in a vibration reduction effect. Not only is it expensive, but it also prevents excessive loads from being applied to adjustment mechanisms such as actuators. Moreover, since an air spring having the same structure as the air spring is used to adjust the height of the air spring, the number of common structural members is increased and the structure is simplified.

Further, the height adjustment air spring and the actuator are provided separately from the installation base, and the height adjustment air spring and the corresponding air spring are connected by a communication pipe that also serves as a throttle hole. Even if there is no installation space for a height adjustment air spring or actuator below the installation stand for installing machinery, etc., the same effect as the above-described first invention can be achieved. Furthermore, the flexible air spring for height adjustment has no sliding parts and has excellent sealing performance even when it is large in size, and at the same time has a structure that can flexibly follow the deformation of the installation stand etc. over time. , can be used stably for a long period of time.

Furthermore, if the height of the air spring is lowered by increasing the area of the pressure receiving part of the height adjusting air spring, the same vibration damping effect can be obtained and the height of the air spring can be kept constant. , the amount of pressurized air to be supplied or discharged is reduced, and the moving distance of the actuator is also reduced.

[Example] Next, an example of the present invention will be described with reference to the drawings. In the schematic cross-sectional view shown in FIG. The main engine 1 is supported via a flexible air spring 2, and is configured so that vibrations of the main engine 1 are absorbed by the air spring 2. In this embodiment, a screw drive shaft is connected to the main engine 1. And the distance (relative position) between the installation stand 9 and the main engine 1
A corresponding air pressure is maintained in the air spring 2 to keep it constant. That is, each air spring 2 communicates with another flexible air spring 3 for air spring height adjustment via a communication pipe 2a that also serves as a throttle hole. Air spring 3 for adjusting the height of this air spring
is interposed between the ram 4a of the actuator 4 within the frame 9a, and the actuator 4 is configured such that pressure oil from a hydraulic unit 8 is controlled by a servo valve 5. Reference numeral 6 denotes a control device, and this control device 6 sends control signals to the servo valve 5 based on signals from a plurality of displacement sensors 7 that are installed on the installation stand 9 and detect the distance between the main engine 1 and the installation stand 9. It is configured as follows.

Next, the operation mode of the above embodiment will be explained. 1st
In the figure, the vibration of the main engine 1 supported on a mounting base 9 via an air spring 2 is absorbed by the air spring 2 and is not directly transmitted to the mounting base 9. By the way, as described above, although the air spring 2 has extremely high vibration insulating properties, the amount of displacement is larger than that of vibration isolating rubber. Therefore, when the hull rocks, the installation platform 9
An external force acts on the main engine 1 supported above the
The air spring 2 located on one side of the hull is compressed as the load from the main engine 1 increases, and the air spring 2 on the other side is compressed as the load from the main engine 1 decreases and moves upward as the main engine 1 tilts. Stretched. In this way, the height balance of each air spring 2 supporting the main engine 1 is lost, and the main engine 1 tends to tilt in the direction of the ship's rocking.
The distance between the two ends becomes smaller, and the distance on the opposite side becomes larger. At this time, the displacement sensor 7 immediately detects the height displacement of the main engine 1 and sends a signal to the control device 6. The control device 6 immediately sends a command to the servo valve 5 based on the signal, sends pressure oil from the hydraulic unit 8 to the actuator 4, and raises or lowers the ram 4a of the actuator 4. As the ram 4a of the actuator 4 moves up or down, the air spring 3 for air spring height adjustment is compressed or expanded between it and the frame 9a, and the air volume decreases or increases. The air spring 3 for adjusting the air spring height and the air spring 2 on the installation base 9 are in air communication, and the air volume of the air spring 2 immediately increases or decreases, and the air spring 2 expands or contracts. The height returns to the original height, and the relative position between the installation base 9 and the main engine 1 becomes the original relative position set in advance. In this way, the positional relationship between the main engine 1 and other devices connected to it can be maintained in a predetermined state.

Next, FIG. 2 shows another embodiment of the present invention. The main difference from the above embodiment is that the air spring 3 and its actuator 4 for adjusting the air spring height, which were separately provided in the above embodiment, are installed below the installation base 9,
A throttle hole 2b is bored in the installation base 9 to connect the communication pipe 2a.
Moreover, the frame body 9a is also used as the installation stand 9. Therefore, the air spring 2 on the installation stand 9 and the air spring height adjustment air spring 3 under the installation stand 9 are communicated with each other via the throttle hole 2b. The air spring 3 for adjusting the height of the air spring under the installation base 9 is connected to the ram 4 of the actuator 4.
As a rises or falls, air is compressed or expanded between it and the installation base 9, and the air volume decreases or increases, and the air volume of the air spring 2 changes accordingly. However, it is fundamentally the same as the embodiment described above, and in FIG. 2, constituent members common to the embodiment described above are indicated using the same reference numerals as in FIG.

Further, FIG. 3 shows a third embodiment of the present invention.
The main differences from the embodiment shown in FIG. 2 are as follows.

(a) The air springs 2 are arranged not only in the vertical direction but also in the horizontal direction, so that the relative position of the supported body 1 with respect to the mounting base 9 in the horizontal direction is also kept constant.

(b) The height of the air spring 2 is lowered by using an air spring 3 with a larger diameter for air spring height adjustment. As a result, it is possible to reduce the distance between the supported body 1 and the installation base 9, that is, the installation space, while obtaining the same spring constant of the air spring 2 as in the embodiment shown in FIG. 2, in other words, the same vibration-proofing effect. There is an advantage that it can be done. Furthermore, this makes it possible to adjust the height of the air spring 2 with less movement of the ram 4a than in the embodiment shown in FIG. This gives rise to the advantage of being able to spend a lot of time.

(c) A speed sensor or acceleration sensor 7' is used instead of a displacement sensor. This results in
It becomes possible to handle up to high frequencies that cannot be tracked by the displacement sensor 7.

[Effects of the invention] The vibration isolation support device of the present invention having the above-described configuration has the following effects.

(1) By using a flexible air spring as a vibration isolating support material, vibration propagation can be reduced by 10 to 20 dB compared to using conventional vibration isolating rubber. In addition, by communicating the air spring with the flexible air spring for height adjustment through the throttle hole, a damping effect is generated on the variable volume air spring for height adjustment, so that load fluctuations on the air spring are absorbed and alleviated. Ru.

(2) Since the relative position of the supported object such as machinery to the installation base can always be maintained constant,
The positional relationship with other equipment connected to machinery etc. can be maintained in a predetermined state, and there will be no misalignment of the joints with other equipment or adverse effects on the equipment.

(3) There is no sliding part for adjusting the height of the air spring.
Although it is large in size, it has excellent sealing performance, and at the same time,
Since it uses a flexible air spring that can flexibly follow the deformation of structures such as installation tables over time, it can be used stably for a long period of time, and it is a common component with air springs for vibration-proof support. , the structure is simplified, and costs can be reduced.

(4) According to the device according to claim 2, the installation location of the height adjustment air spring and its actuator can be arbitrarily selected, and there is no need to install it below the air spring that directly supports the supported object. , problems related to installation space can be solved.

(5) According to the device according to claim 3, since the distance between the supported body such as machinery and the installation base can be reduced, similar to the device according to claim 2,
Problems regarding installation space can be resolved.

[Brief explanation of the drawing]

The drawings show embodiments of the vibration isolating support device of the present invention, and FIGS. 1, 2, and 3 are schematic sectional views showing different embodiments. 1... Main engine (supported body), 2... Air spring, 2
a...Communication pipe, 2b...Communication hole, 3...Air spring for air spring height adjustment, 4...Actuator, 4
a... Actuator ram, 5... Servo valve,
6... Control device, 7... Displacement sensor, 7'... Speed sensor (or acceleration sensor), 8... Hydraulic unit, 9... Installation stand, 9a... Frame.

Claims (1)

[Claims for Utility Model Registration] 1. A vibration-proof support device that supports a supported object such as machinery via air springs arranged on a mounting base, wherein the supported object is supported by a plurality of flexible air springs. and a flexible air spring for height adjustment is disposed in communication with each of the air springs through a throttle hole, and a flexible air spring for changing the volume of the height adjustment air spring is provided. An actuator is provided, and pressurized air is supplied from the height adjustment air spring to the inside of the air spring via the actuator in response to load fluctuations on each air spring acting from the supported body or for height adjustment. A machine configured such that the relative position of the supported body with respect to the installation base is always constant by discharging pressurized air in the air springs to maintain the height of each of the air springs constant. Anti-vibration support devices such as 2. The height adjusting air spring and the actuator are provided apart from the installation base, and the height adjusting air spring and the corresponding air spring are connected by a communicating pipe that also serves as the throttle hole. 1. The anti-vibration support device for machinery etc. described in 1. 3. The vibration isolating support device for machinery, etc. according to claim 1 or 2, wherein the height of the air spring is reduced by increasing the area of the pressure receiving part of the height adjusting air spring.