JPS6146439Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a centrifugal force loading device for conducting experiments using scale models of civil engineering structures and other scale models.

PRIOR ART

Even if you create a scale model of the actual object in a normal gravity field, it is difficult to reproduce the internal stress caused by its own weight.
For this reason, a centrifugal force loading device is known as a means for reproducing stress due to its own weight.

A centrifugal force loading device suspends a sample box containing a test object, such as a scale model of the ground, a port, or an offshore structure, from the end of a rotating frame that is directly connected to a rotating central shaft, and rotates it to apply gravity to the test object. The purpose is to provide a centrifugal acceleration that is N times the acceleration. At this time, the sample box is swung up by centrifugal force.

Figures 1 and 2 show an example of a conventional centrifugal force loading device as a comparative example, in which a sample box e is suspended from the tip of a pin support d of a rotating frame c, and the rotation of the rotating frame c. pin bearing d
The structure is such that the sample box e can be swung up using the fulcrum as a fulcrum.

[Problem that the invention attempts to solve]

However, the above-mentioned device has the following problems.

Since all the centrifugal force of the sample box e is borne by the pin support d, if a large centrifugal force is required, the structure of the pin support d becomes large. It also lacks safety.

The sample box e moves up and down in response to rotational fluctuations, which adversely affects the sample (model).

The size of the sample box is relatively limited.

There are some problems, and there is a lot of room for improvement.

The centrifugal force loading device of this invention is intended to solve the above-mentioned problems.

[Means for solving the problem]

Hereinafter, the apparatus of this invention will be explained using reference numerals in the drawings corresponding to the embodiments.

In the centrifugal force loading device of this invention, the vertical sliding axis 2
In a centrifugal force loading device in which a loading platform 6 is rotatably supported by a horizontal rotation frame 5 fixed to a horizontal rotation frame 5 by a pin support 8 in a direction perpendicular to the rotation frame 5, the loading platform 6 is supported by a pin support. 8 is eccentrically suspended and supported via a composite torsion rod device 7, and the end of the rotating frame 5 is provided with a deck plate 9 on which the loading platform 6 can be seated when a centrifugal force of a predetermined amount or more is applied. It becomes.

The composite torsion rod device 7 includes a hollow torsion rod 10 having a fixed end and a solid torsion rod 11 inserted into the hollow torsion rod 10 and having a free end, which are fixedly connected to each other at their other ends. , the fixed end of the hollow torsion rod 10 is fixed to the rotating frame 5, and the free end of the solid torsion rod 11 has a pin bearing 8.
are mounted eccentrically, and as the hollow torsion rod 10 and solid torsion rod 11 are twisted, the pin support 8 is displaced.

[Effect]

7 and 8 show the operation of the centrifugal force loading device of this invention.

In the centrifugal force loading device of this invention, the loading platform 6
is rotatably supported by a pin support 8 in a direction perpendicular to the rotating frame 5, and as shown in FIG. In this case, a gap of δ is created between the loading platform 6 and the deck plate 9 provided at the end of the rotating frame 5. In addition, the figure shows the bottom surface of the loading platform 6 and the surface of the deck plate 9 opposing the bottom surface as a convex curved surface and a concave curved surface having the same curvature, respectively.

When the centrifugal force loading device is activated and the sliding shaft 2 is rotated, the horizontal rotating frame 5 fixed thereto
rotates around the sliding axis 2. The pin bearing 8 is a composite torsion rod device 7 fixed to the rotating frame 5.
torsion rod (hollow torsion rod 10, solid torsion rod 1
1), and is mounted eccentrically with respect to loading platform 6.
Due to the centrifugal force acting on the pin support 8 which is suspended and supported, a moment of T=F・R is generated around the center axis of the torsion rod (R is the distance from the center axis of the torsion rod to the pin support 8, F is the distance from the center axis of the torsion rod to the pin support 8, centrifugal force acting on 8).

The composite torsion rod device 7 includes a hollow torsion rod 10 having a fixed end fixed to the rotating frame 5, and a solid torsion rod having a free end inserted into the hollow torsion rod 10 and having the pin bearing 8 mounted eccentrically. 11
are fixedly connected to each other at their other ends, and due to the above-mentioned moment T, the solid torsion rod 1
1 and the hollow torsion rod 10 are twisted, so that the pin support 8 is displaced toward the deck plate 9. When the rotational speed of the sliding shaft 2 increases and a centrifugal force of more than a predetermined value acts, and the torsion angle at the end of the solid torsion rod 11 reaches θ shown in FIG. 8, the pin support 8
The displacement becomes Rθ=δ, and the bottom surface of the loading platform 6 is seated on the deck plate 9. Thereafter, the deck plate 9 of the rotating frame 5 bears the increased centrifugal force due to the increase in the number of rotations.

〔Example〕

Next, a description will be given based on the illustrated embodiment.

Figures 3 and 4 show the internal structure of the centrifugal force loading device of this invention.
The left side of the figure shows a state in which the loading platform 6 is swung up due to centrifugal force, and the right side shows a state in which the loading platform 6 is suspended when it is stationary.

This centrifugal force loading device includes a rotating frame 5 directly connected to a sliding shaft 2 which is rotated by the drive of a motor 15;
It is composed of a loading platform 6 supported perpendicularly to a rotating frame 5 via a composite torsion rod device 7, and a circular pit 1 for storing the loading platform 6.

The sliding shaft 2 is supported by bearing parts 3 and 4, and the pit 1
It is configured to rotate via a drive shaft 16 and a reduction gear 17 by driving a motor 15 installed outside of the motor. This vertical axis 2 has a frame mounting base 18.
are fastened together, and four rotating frames 5 are fixed to this.

The composite torsion rod device 7 is attached to this rotating frame 5, and the loading platform 6 is rotatably suspended and supported by a pin support 8 provided parallel to the central axis of the torsion rod. Furthermore, a deck plate 9 is formed at the end of the rotating frame 5, on which the loading platform 6 that has been swung up by centrifugal force is seated by the action of a compound torsion rod device 7. 9 bears the increased amount of centrifugal force.

The principle of the composite torsion rod device 7 is to create a torsion angle in the torsion rod by the load acting on the pin support 8 by applying a lever, thereby giving displacement to the pin support 8, and it can be installed in a small space. Thus, the hollow torsion rod 10 and the solid torsion rod 11 are combined to form a composite torsion rod.

That is, as shown in FIGS. 5 and 6, the composite torsion rod device 7 has a hollow torsion rod 10 and a solid torsion rod 11 inserted into the hollow torsion rod 10, which are integrated at one end with a knock pin 12. The other end of the hollow torsion rod 10 is fixed to the rotating frame 5 via the bracket 20 as a fixed end, and the other end of the solid torsion rod 11 is fixed to the flange 13 as a free end.
is formed, and a pin support 8 is provided parallel to the central axis of the torsion rod.

The centrifugal force loading device shown in the figure is housed in a circular pit 1 made of reinforced concrete with a diameter of 10 m and a height of 4 m, with a distance of 3.40 to 3.80 m to the center of the sample box, a maximum centrifugal acceleration of 110 to 155 g, and a maximum loading weight of 2.76 tf. For example, in an experiment where a centrifugal acceleration of 100G is applied, this device is designed so that the loading platform 6 and the deck plate 9 come into close contact with each other at an acceleration of about 30G. I will be in charge.

[Effect of idea]

The centrifugal force loading device of this invention has the above-mentioned configuration and has the following advantages and features.

In this centrifugal force loading device, in order to stably rotate the sample box, a deck plate is provided at the end of the rotating frame, and the loading platform can be smoothly brought into close contact with this by the action of a composite torsion rod device. Furthermore, even if there are rotational fluctuations, the sample box remains stable without vertical movement.

Since there is a gap between the loading platform and the deck plate, even if there are some manufacturing errors, the composite torsion rod device can smoothly bring them into close contact.

The length of the torsion rod is related to torsional stiffness, and in order to reduce this torsional stiffness, it is necessary to make the torsion rod longer. In contrast, in this invention, the hollow torsion rod and the solid torsion rod of the composite torsion rod device are integrated, so that the same effect as if the torsion rod were made longer can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the internal structure of a centrifugal force loading device using a simple pin support, Fig. 2 is a front view, and Fig. 3 is a plan view showing the internal structure of the centrifugal force loading device of this invention. Figure 4 is also a front view, Figure 5
The figure is a longitudinal sectional view of the composite torsion rod device, FIG. 6 is a side view of the loading platform, and FIGS. 7 and 8 are explanatory diagrams of the operation of the composite torsion rod device. a... pit, b... sliding axis, c... rotating frame, d... pin support, e... sample box, f... motor, 1... pit, 2... sliding axis, 3... Bearing part, 4... Bearing part, 5... Rotating frame, 6...
Loading platform, 7...Composite torsion rod device, 8...Pin support, 9...Deck plate, 10...Hollow torsion rod, 11...Solid torsion bar, 12...Knock pin, 13...Flange, 14... ...sample box, 15...
...Motor, 16...Drive shaft, 17...Reduction gear, 1
8... Frame mounting base, 19... Bearing, 20...
Bracket for torsion rod.

Claims (1)

[Scope of utility model registration request] In a centrifugal force loading device in which a loading platform 6 is rotatably supported by a horizontal rotating frame 5 fixed to a vertical sliding shaft 2 by a pin support 8 in a direction orthogonal to the rotating frame 5, A hollow torsion rod 10 having a fixed end fixed to the rotating frame 5 and a solid torsion rod 11 having a free end inserted into the hollow torsion rod 10 and having the pin bearing 8 eccentrically attached thereto, the other end of each of which is fixed. When the loading platform 6 is suspended and supported via a composite torsion rod device 7 that is fixedly connected to each other, and a centrifugal force of a predetermined value or more is applied to the end of the rotating frame 5, the composite torsion rod The deck plate 9 can be seated on the loading platform 6 by the displacement of the pin support 8 in accordance with the torsion angle of the hollow torsion rod 10 and the solid torsion rod 11 of the device 7.
A centrifugal force loading device comprising: