JPH078400Y2 - Braking device for weightless drop device - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an improvement of a braking device in a gravity-free dropping device for dropping a capsule containing a test body from a high place.

[Prior art]

Conventionally, as this type of braking device, there are a mechanical type device and an electric type device. As the mechanical type, a braking device using a sand pit as shown in FIG.
-292600 gazette) etc.

Further, as an electric type, there is a linear motor type in which a reaction plate is provided in a capsule as shown in FIG. 4B (as one example, JP-A-61-146700).

Also, when the capsule is dropped in a vacuum underground pile and reaches a predetermined depth, compressed air is released to decelerate the capsule, and the decelerated capsule is softly attached onto a pedestal equipped with a shock absorber. There is a device for absorbing the impact of dropping. (For example, Japanese Patent Laid-Open No. 62-248000) [Problems to be solved by the invention] In the sandpit method shown in FIG. 4a, the maximum acceleration during capsule braking is large, and the sand layer is not removed by repeated drop tests. Due to the fact that it solidifies, it is necessary to manage the sand layer in order to keep the penetration depth always constant, which limits the implementation of drop tests.

In the linear motor system shown in FIG. 4b, since the arrangement of a large number of coils is required, the cost of the entire device becomes high,
In addition, it is difficult to maintain the clearance between the coil and the capsule.

Further, in the microgravity generator disclosed in JP-A-62-248000, the compressed air container lid is opened before the capsule reaches the pedestal to release compressed air. Since the pressure due to the upward flow of air acts on the capsule to decelerate the capsule and soften the capsule on the pedestal, there is a problem with the timing of the release of compressed air, which makes the entire device complicated and costly. There is inconvenience.

An object of the present invention is to provide an airtight pit cylinder portion, which is in sliding contact with an air seal member provided on the outer periphery of a bucket member, at the lower part, and to perform braking by the descending action and the exhaust action of the bucket member due to the impact of the capsule drop support. However, it is an object of the present invention to provide a braking device that can rationally solve the problems of the prior art.

[Means for Solving the Problems]

The structure of the present invention, which solves the problems of the prior art, has a ground drop tower that drops a capsule containing a test sample from a high place, or a device that reduces the acceleration of the falling capsule and brakes it under the underground pile. In the braking device in the weightless dropping device installed, a bucket member for supporting the falling capsule is fitted in an air-sealed state to the lower part of the above-mentioned ground drop tower or underground pile, and a required length having an airtight space. It is characterized in that a pit cylinder part is provided, and an exhaust path for gradually discharging the air in the airtight space to the outside is provided in multiple stages in the pit cylinder part.

[Embodiment 1] (FIGS. 1 to 3) Next, details of an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway front view using an underground pile, FIG. 2 is a vertical cross-sectional view with some parts omitted, and FIG. 3 is a transverse plan view of the same.

Reference numeral 1 denotes an underground standing pile, and an air seal member 4 provided on the outer periphery of a bucket member 3 supporting a capsule 2 falling from above the underground standing pile 1 is slidably contacted with a lower portion of the underground standing pile 1 to form an airtight space. The pit cylinder 6 having a required length which constitutes 5 is erected so as to coincide with the drop line of the capsule 2. The mine cylinder body 6 is provided with a multi-stage radial exhaust passage 7 for gradually exhausting the air in the airtight space 5 to the outside, and has a bucket member 3 having the air seal member 4 on the outer periphery.
The radial exhaust passages 7 are provided in multiple stages and the airtight space 5 is provided.
The air cushion braking device A is constituted by the mine cylinder body 6 having.

Further, the exhaust passage 7 is provided with a pipe, as shown in FIGS.
Alternatively, the exhaust flow rate is adjusted by forming a duct structure, but the exhaust flow rate can be adjusted by providing an orifice, a slit portion 8 or a valve (not shown) inside the duct structure. Also, as is clear from FIGS.
The pitch of the radial exhaust passages 7 is sequentially changed from the upper part to the lower part of the mine cylinder body 6, and the bucket member 3
Adjusts the air cushion acting force as it reaches the lower side of the mine cylinder body 6 to support the soft attachment of the capsule 2. Further, by inserting a cushioning material 9 such as sand into the bucket member 3, the soft-adhesion effect of the capsule 2 can be further enhanced.
In the above-described embodiment, the air cushion braking device A having the above-described configuration is installed under the underground standing pile 1, but it is also applicable to a case where it is installed in the ground drop tower (not shown) in place of the underground standing pile 1. It is not limited to any possible embodiment.

In the figure, 11 is the experimental building, 12 is the hoist for moving the capsule, and 13 is the hoist for moving the capsule.
Is a hoisting device for the elevator 10, 14 is a crane, 15 is a hoisting device, and 16 is a bottom working room.

[Explanation of action]

Next, the operation of the above embodiment will be described. After the capsule 2 containing the test body is made to stand still at a predetermined dropping position, the capsule 2 is dropped by a separating mechanism (not shown). The inside of the capsule 2 being dropped is in a weightless state for a few seconds, and during this period, various data of the test body accommodated in the capsule 2 can be obtained. The capsule 2 is received by the bucket member 3, and the load impulse received by the bucket member 3 has the effect of compressing the air in the airtight space 5 formed in the pit cylinder 6 and the airtightness. The air in the upper space 5 is gradually exhausted from the exhaust passage 7 and is relaxed by an air cushion braking force, and the bucket member 3 stops at a predetermined braking distance while the capsule 2 is softly supported. Then, the recovered capsules 2 are transported by the crane 14 to the upper experimental building 11. The recovered capsule 2 can be transported to the upper experimental building 11 by the elevator 10. This operation is repeated.

[Effect of device]

As described above, according to the configuration of the present invention, the following effects can be obtained.

(A) The falling impulse of the falling capsule received by the bucket member causes the bucket member to compress the air in the airtight space formed in the tube portion and gradually discharges the air in the airtight space to the outside from the exhaust passage. The capsule cushion is softly received and supported by the bucket member within a predetermined braking distance by the air cushion function which is composed of the following action.

(B) The air cushion braking force can be arbitrarily set by changing the position and number of the exhaust passages.

(C) Since there is no damage or consumable parts as in the prior art,
Economical effects such as low equipment costs and low operating costs are high.

[Brief Description of Drawings] FIG. 1 is a partially cutaway front view of the present invention using underground piles,
2 is a partially omitted vertical sectional view of the same as above, FIG. 3 is a transverse plan view of the same as above, and FIGS. 4a and 4b are explanatory views of the prior art. A …… Air cushion braking system, 1 …… Underground pile, 2 …… Capsule, 3 …… Bucket member, 4 …… Air seal member, 5 ……
Airtight space, 6 …… Cylinder, 7 …… Exhaust passage.

Front page continuation (72) Inventor Yasuhiro Nakanishi 234 Matsumoto, Higashiya-cho, Nishi-ku, Kobe-shi, Hyogo Kawasaki Heavy Industries, Ltd. Inside the Nishi-Kobe factory

Claims (1)

[Scope of utility model registration request] Claims: 1. Braking in a gravity-free dropping device, in which a capsule containing a test sample is dropped from a high place, or a device for reducing and accelerating the falling capsule is provided below the underground pile. In the device, the above ground drop tower, or, in the lower part of the underground pile, fitted with a bucket member for supporting the falling capsule in an air-sealed state, and provided with a hollow cylinder portion of a required length having an airtight space,
A braking device in a gravity-free dropping device, wherein an exhaust passage for gradually exhausting the air in the airtight space to the outside is provided in a multistage manner in the mine cylinder portion.