JPS61264236A - Peripheral pressure inspection device for cylindrical body - Google Patents

Abstract

PURPOSE:To perform accurate pressure inspection by forming a pessure chamber around an object to be examined and applying a uniform pressure to the outside periphery of the object to be examined through an expansible cover member. CONSTITUTION:A pressure chamber 16 surrounded with a cylindrical body 1, a cover body fixing plate 3, a paper tube outside ring 9, and a sheet body 12 around a paper tube (a) is formed in a peripheral pressure inspection device, and a fluid is supplied from a supply entrace 17. The sheet body 12 around the paper tube (a) prevents the fluid from contacting directly with the outside peripheral surface of the paper tube (a) to protect the paper tube (a) which is degenerated by contacting with the fluid. Even if the paper tube (a) is deformed as shown by a broken line a', the sheet body 12 is deformed while being closely into contact with the outside peripheral surface of the paper tube (a) because the sheet body 12 is expansible. As the result, an external pressure acts upon the outside peripheral surface of the paper tube (a) without being affected by the sheet body 12 even after deformation of the paper tube (a) is started, and correct measurement is possible therefore.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention applies pressure from the outer periphery of a cylindrical body to improve the strength and strength of the cylindrical body.
This invention relates to a device for inspecting deformation, etc. In particular, the present invention relates to an apparatus suitable for inspecting cylindrical bodies such as paper tubes that are susceptible to deterioration due to direct contact with fluid.

[Conventional technology]

Today, paper tubes are widely used as cores for winding strips, and there are a wide variety of types, materials, quantities, etc. of the materials to be wound. Therefore, although the strength required for the paper tube serving as the winding core varies, the strength of each paper tube has only been determined based on experience.

[Problems to be solved by invention C] However, in today's world, where the objects to be wound are diversifying and the types of paper tubes that serve as the winding core are also diversifying, it is difficult to rationally and rationally improve the strength and deformation of the paper tube against external pressure. There is an urgent need to examine and express it numerically.

[Means for solving problems]

Therefore, the present invention aims to provide an apparatus for easily inspecting the strength and deformation of a paper tube against external pressure while taking into consideration the characteristics of the paper tube. A cylindrical test object was inserted through the test object, and a cover member having extensibility for blocking fluid was attached to the outer periphery of the inserted test object, so that the fluid was pressurized without directly contacting the test object. Provided is a circumferential pressure testing device for a cylindrical body.

It is sufficient that the cover member covers the entire outer periphery of the portion of the paper tube that is passed into the pressurizing chamber. In addition, the cover member adheres closely to the outer periphery of the test object by pressurizing the fluid, expands and deforms in response to the deformation of the test object caused by the pressurization, and has an elongation that allows it to remain in close contact with the outer periphery of the test object. Having sex is enough.

[For production]

A constant pressure is applied to the outer periphery of the test object via the cover member by the fluid supplied into the pressurizing chamber. At this time, since the cover member has extensibility, it reliably comes into close contact with the outer periphery of the test object. In particular, when the specimen is deformed due to pressurization,
Due to its extensibility, the cover member expands and deforms in accordance with the deformation of the test object, and remains in close contact with the outer periphery of the test object.

〔Example〕

The present invention will be explained in detail below based on the drawings. FIG. 1 shows a first embodiment of the present invention, and this circumferential pressure inspection device consists of a hollow cylindrical main body fi+ and lids (
21 (21).A circular central hole +41 (41) is provided at both ends of the cylindrical body (1).

A disc-shaped lid fixing plate f31 (31) is attached.

The lid body fixing plate [3] +31 is screwed to the inner peripheral surface of the cylindrical body (1) and is welded +61 (61) on the outer peripheral part, thereby fixing the lid body in an airtight state. +21 +21 also has a lid fixing plate +3143
The lid body fixing plate (3) has a disc shape approximately equal to the outer diameter of item 1.
A paper tube insertion opening fil +71 having an inner diameter approximately equal to that of the center hole +41 +41 is opened. This lid body (2) +21 is attached to the lid body fixing plate +31 +31 from the axial direction with an appropriate number of bolts (8).

And, between the lid body fixing plate (31 (3+) and the lid body (21 (21), there is a paper tube outer diameter ring +91 (91 is both +21
(The paper tube outer diameter rings (9) (9) have the same outer diameter as the paper tube (a) as the test object, and the When inspecting a tube with a smaller outer diameter than tube (a), for example, a paper tube outer diameter ring with a smaller inner diameter shown by a two-dot chain line +91 +91
is used. The inner peripheral surface and inner end surface of this paper tube outer diameter ring +91 and +91 are respectively 0 rings θI Qlαl)Qυ
The former O-ring GOI maintains airtightness with respect to the lid body fixing body (3) (3), and the latter O-ring ALLall maintains airtightness with respect to the paper tube (a).

In this way, the entire outer peripheral surface of the paper tube (a) is covered with the stretchable sheet side, and the paper tube is inserted through the paper tube insertion opening (7) of the lid (2) at one end to the paper tube of the lid (2) at the other end. It is passed through the insertion port (7). This insertion is performed by removing the lid (2), and in order to facilitate this insertion, the inner circumferential ends of the lid fixing plate f31+31 and the lid (21+21) are chamfered as appropriate.

The paper tube (a) has a paper tube inner diameter ring α surrounding inserted into both ends of its inner peripheral surface. In this paper tube inner diameter ring a1α,
The outer diameter of the main body is equal to the inner diameter of the paper tube, and the outer end (141
The outer diameter of the zero season is slightly larger and is formed into a flange shape. The paper tube inner diameter ring 031θj is the paper tube (a) described later.
It has the strength to withstand the external pressure applied to the paper tube (a) and supports the paper tube (a) against the external pressure. Both paper tube inner diameter rings Q3) α beauty inner end Q5) a! Between 9 and 9, there is nothing to support the paper tube (a), and both internal parts of the paper tube (a) are 0.
The portion 9α9 is the subject of inspection for external pressure. Therefore, the length of the part to be inspected is determined by the length between the 100-yen ends Q51051, and if necessary, the length of the paper tube inner diameter ring 0
What is necessary is to change the length of 31O■. Furthermore, when inspecting paper tubes (a) with different inner diameters, other paper tube inner diameter rings with different outer diameters may be used.

The sheet body 0 described above protects the outer surface of the paper tube when the paper tube is inserted between the two lids (21+21), and works together with the O-ring aυ to improve airtightness.

In this example, a 1 mm thick synthetic resin film was used, but a sheet body having a material and thickness that meets the purpose of the sheet body 021 may be appropriately selected.

Thus, in this circumferential pressure testing device, the cylindrical body +11,
A pressurizing chamber Ol is formed surrounded by the lid body fixing plate (3), the paper tube outer diameter ring (9), and the sheet body side on the outer periphery of the paper tube, and is formed at an appropriate location on the side wall of the cylindrical body (11 (in the example, at the center). ) The fluid is supplied from the supply port aη opened in the pressurizing chamber Ol.In this embodiment, water is used as the fluid, and the supply is pressurized by water pressure &! A high pressure is applied to the paper tube (a).In addition to water, oil, air, etc. are appropriately used as the fluid.Thereby, the paper tube (a) receives uniform pressure from the outer periphery.

As a result, it is confirmed that, for example, the paper tube (a) is deformed or cracked as shown by the two-dot chain line (a)'. Furthermore, the strain on the inner circumferential surface of the paper tube (a) can also be measured using a strain gauge α field.

Here, the sheet body (2) on the outer periphery of the paper tube prevents fluids such as water from coming into direct contact with the outer circumferential surface of the paper tube (a), and protects the paper tube from deterioration due to contact with water, etc. . moreover,
Even when the paper tube (a) is deformed as shown in (a),
Since the sheet body side has extensibility, it deforms like a hammer while being in close contact with the outer peripheral surface of the paper tube (a). As a result, even after the paper tube (a) has started deforming, the external pressure acts on the outer periphery of the paper tube (a) without being influenced by the sheet body @, so accurate measurement is possible.

Next, a second embodiment will be described based on FIG. In this second embodiment, a paper tube (b) with a relatively small diameter is inspected, and a disk-shaped paper tube (22) having paper tube insertion holes (22) at both ends of a hollow cylindrical body (21) is used. Lid body (23)
(23) are screwed (24) (24).

A cover member is attached to the outer periphery of the paper tube (b) to be inserted, and this cover member is a rubber tube (25) that is an elastic hollow body formed in a ring shape, and has a ring-shaped inner peripheral surface (
26) is attached to the outer circumferential surface of the paper tube (b), and the annular outer circumferential surface (27) is attached to the inner circumferential surface of the cylindrical main body (21).

A fluid inlet (28) is attached to an appropriate location (center in the embodiment) on the outer circumferential surface (27) of this rubber tube (25). This fluid inlet (28) has a rubber ring (2
A cylindrical member (30) having a cylindrical member 9) fixed to the base end thereof is passed from the inside to the outside of the outer peripheral surface (27) of the rubber tube, and is screwed onto the inner surface of the socket (31). This fluid inlet (28) is passed to the outside through an inlet (32) formed in the side wall of the cylindrical main body (21).
lThus, the rubber tube (
Water is pressurized and supplied into the interior (33) of 25) from a hydraulic machine (not shown) via a fluid inlet (28). Furthermore, the first
Although paper tube inner diameter rings (34) (34) may be used as in the embodiment, they are not necessary when the applied pressure is small. In addition to the rubber tube (25), the elastic hollow body includes
It can be changed as appropriate depending on the type of fluid and pressure.

〔Effect of the invention〕

As described above, the circumferential pressure testing device for a cylindrical body of the present invention forms a pressurizing chamber around the outer periphery of the test object, and applies uniform pressure to the outer periphery of the test object via the stretchable cover member. By adding , accurate pressurization tests can be performed. Moreover, the cover member attached to the outer circumference of the test object can protect the outer circumferential surface of the test object from the pressurizing fluid, improve the airtightness of the pressurization chamber, and has the characteristic that it is vulnerable to water etc. This provides an inspection device that is most suitable for pressurized inspection of paper tubes and the like.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view of one embodiment of the invention, and FIG. 2 is a partially sectional side view of another embodiment of the invention. (1) (21)...Cylindrical body, +21 (23)...
・Lid body, (7+(22)...Paper tube insertion port, Q2...
Sheet body, 0[9... Pressure chamber, (25)... Rubber tube, (a) (b)... Paper tube.

Claims (3)

[Claims] (1) In a circumferential pressure inspection device for a cylindrical body that pressurizes the outer periphery of a cylindrical object, which is likely to undergo deterioration due to direct contact with fluid, with fluid supplied into a pressurizing chamber, A cylindrical test object is inserted from one end of the pressurized chamber to the other end, and a cover member with extensibility for blocking fluid is attached to the outer circumference of the inserted test object, and the fluid is brought into direct contact with the test object. A circumferential pressure inspection device for a cylindrical body, characterized in that it is configured to pressurize without causing any pressure. (2) The circumferential pressure testing device for a cylindrical body according to claim 1, wherein the cover member is a sheet body that can be brought into close contact with the outer periphery of the test object. (3) The cover member is an elastic hollow body formed in a ring shape, and this elastic hollow body is housed in a pressurizing chamber, and the ring-shaped inner peripheral surface is attached to the outer periphery of the test object. The circumferential pressure testing device for a cylindrical body according to claim 1, wherein fluid is supplied into the hollow interior to apply pressure to the outer periphery of the test object. .