JPH0346077Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a liner closure device used for collecting cores for analyzing strata.

[Prior Art] In order to investigate a stratum at a desired depth, it is necessary to collect rocks, clayey soil, etc. from the stratum. In order to collect the soil, the soil is first drilled to just before the stratum, then a hollow cylindrical liner with a pointed tip is inserted into the stratum, and the clay from the stratum is pulled out, leaving behind the viscous soil inside the liner. Ta. The collected clay soil, etc. will be retained in the liner and transported to the testing and analysis laboratory. During this transportation, vibrations and shocks are applied to the liner, which may cause the clay inside the liner to crumble from the ends. Conventionally, wax was filled into the liner on-site and solidified to close the liner.

[Problems to be solved by the invention] The conventional technique of closing the liner using wax as described above requires a container and a firearm for melting the wax, and the work of melting the wax is troublesome.
Moreover, a considerable amount of time was required from the time the wax melted until it was filled and solidified.

Furthermore, since the solidified wax must be melted again in testing laboratories, this work is troublesome, and the disposal of the melted wax is also troublesome.

Moreover, when wax was used, there was a problem in that the wax would seep into rocks.

In view of the above-mentioned problems, the present invention aims to provide an obturator that allows the liner to be closed and opened very easily and that can be used repeatedly.

[Means for solving the problem] In the present invention, two truncated conical members are formed with a bolt through hole in the center, the small diameter portions are arranged facing each other, and the bolt is inserted into the bolt through hole of each of the truncated conical members. a bolt that is screwed into the threaded portion of the bolt, and a nut that pinches both of the truncated conical members with the head of the bolt;
An expansion member in which an annular member is radially divided into a plurality of parts, and an inner circumferential portion thereof is tapered to fit into a valley between the truncated conical members and fitted between the truncated conical members, and the expansion member An obturator was formed by a packing material made of an elastic material including the outer circumferential surface of the bolt and the end surface on the head side of the bolt.

[Operation] In the obturator of the present application having the above configuration, when the nut is rotated, the expansion member moves in a direction to expand or contract its diameter and outer circumference. By performing this operation after inserting the obturator into the liner, the obturator can be brought into pressure contact with the inner wall of the liner to close and open the liner.

[Example] Hereinafter, an example of the present invention will be described based on the attached drawings. FIG. 1 is a partially cutaway perspective view of a preferred embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the same embodiment.
FIG. 3 is a sectional view showing the same embodiment applied to a liner.

In the figure, 10 is the obturator of the present application, and 12 and 14 are truncated conical members having a bolt through hole in the center.
It passes through 6. The bolt 16 has a dish-shaped head 16a at one end, and threaded portions 16b, 16c having different diameters and cut in opposite directions at the other end. A nut 18 is screwed into the large diameter threaded portion 16b, and the truncated conical members 12, 14 are compressed by the head 16a. The end surface of the truncated conical member 14 that comes into contact with the head 16a is countersunk to accommodate the head 16a.

Reference numerals 20, 20, . . . are expansion members formed by dividing an annular member radially into equal parts to form a wedge-shaped planar shape, and are fitted around the truncated conical members 12, 14. The inner circumferential portion of each expansion member 20 is connected to the truncated conical member 1
It is tapered so as to fit into the valley between 2 and 14 and to come into surface contact with the inclined outer peripheral surfaces of the truncated conical members 12 and 14.

A packing material 22 is made of an elastic material and covers the outer peripheral surface and bottom surface of the expansion member 20. This packing material 22 constantly presses each expansion member 20 toward the center with its elastic force.

24 is a box spanner that fits into the nut 18, and has a shaft portion in the shape of a hollow tube. Reference numeral 26 denotes a holder having a female threaded portion at its tip to be screwed into the threaded portion 16c, and can be inserted into the shaft portion of the Vex spanner 24.

truncated conical members 12, 14, bolt 16, nut 1
8. The expansion members 20, 20, . . . are preferably formed of synthetic resin, for example, what is called engineering plastic.

Next, the operation of this embodiment having the above configuration will be explained.

When the nut 18 is rotated clockwise, that is, so as to approach the head 16a, the truncated cone member 12 and the truncated cone member 14 approach each other, and the truncated cone member 1
The gap between 2 and 14 becomes narrower. Therefore, the expansion members 20, 20, ... that had been fitted into this valley are pushed out from this valley, and the expansion members 20, 20,
. . . expands the packing material 22 in a direction that increases its diameter and circumference.

Turn the nut 18 counterclockwise, that is, head 16b
When rotated in the direction away from the truncated cone member 1
2 and the frustoconical member 14 can be separated from each other. At this time, the expanding members 20, 20, . , diameter and circumference are reduced.

Next, the operation of closing the liner 28 using the closing device 10 of this embodiment will be explained.

The obturator 10 is inserted into a liner 28 that has been pulled up from a wellbore or the like and is filled with a core (cohesive soil or the like).
When inserting, tighten box spanner 24 to nut 1.
It is preferable to do this after fitting the holder 26 to the threaded portion 16c. Once the bottom of the obturator 10 contacts the core, hold the holder 26 to prevent the bolt 16 from rotating and tighten the box spanner 24.
clockwise to expand the expansion member 20 and press the packing material 22 onto the inner surface of the liner 28. The packing material 22 is applied to the liner 2 with moderate pressure.
After rotating the box spanner 24 until it is pressed against the inner surface of the box spanner 8, the box spanner 24 and the holder 26 are removed. With the above operations, the closing of one opening of the liner 28 is completed.

Another closure 10 is similarly inserted and secured through the other opening in liner 28. Now liner 28
The closure of the liner 2 has been completed, and the liner 2
The core inside 8 will not collapse and spill.

From Liner 28 that arrived at testing and analysis laboratories,
Box spanner 24 and holder 26 similar to those described above
The nut 18 is rotated by the screws to retract the expansion member 20 and the obturator 10 is removed. The core can now be removed from the liner 28. Obturator 10
can be used repeatedly to occlude liner 28.

In this embodiment, a combination of a reverse thread and a holder is shown in order to prevent rotation of the bolt 16, but the connecting portion between the bolt and the holder may be formed into a bayonet type.

[Effects of the invention] As is clear from the above explanation, the pole closure device is easy to operate because it can easily close and open the liner, and it is also highly efficient because it does not allow any impurities to enter the core. Accuracy can be analyzed. Furthermore, the obturator itself can be produced at low cost and can be used repeatedly, so costs can be kept low.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway perspective view of a preferred embodiment of the present invention, Fig. 2 is a longitudinal sectional view of the embodiment, and Fig. 3 is a sectional view showing the embodiment applied to a liner. . 10... Obturator of the present invention, 12, 14... truncated conical member, 16... Bolt, 16a... dish-shaped head, 16b... large diameter threaded part, 16c... small diameter threaded part, 18 ... Nut, 20, 20, ... Expansion member, 22 ... Packing material, 24 ... Box spanner, 26 ... Holder, 28 ... Liner.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A truncated conical member 12, 14 having a bolt through hole in the center and arranged with the small diameter portions facing each other, and a bolt inserted into the bolt through hole of the truncated conical member 12, 14. 16, and screwed into the threaded portion 16b of the bolt 16, and the head 16a of the bolt 16 connects the both truncated conical members 1.
2 and 14; and the annular member is divided radially into a plurality of parts, and the inner circumferential portion is tapered to fit into the valley between the truncated conical members 12 and 14. 1
Expansion members 20, 20, fitted between 2, 14,
. . . and a packing material 22 made of an elastic material that wraps around the outer peripheral surfaces of the expansion members 20, 20, . . . and the end surface on the head 16a side of the bolt 16. A coring liner obturator characterized in that each expansion member 20, 20, . . . moves in a direction to increase or decrease its outer diameter. (2) The closure for a core collection liner according to claim 1, wherein the bolt 16 has a threaded part 16c having a smaller diameter and cut in the opposite direction at the tip of the threaded part 16b. Ingredients.