JPH0431343B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an apparatus that applies pressure from the outer periphery of a cylindrical body to inspect the strength, deformation, etc. of the cylindrical body. especially,
The present invention relates to a device 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.

[Problem that the invention seeks to solve]

However, today, as the objects to be wound are diversifying and the types of paper tubes that serve as the winding core are also diversifying, there is a need to rationally inspect the strength and deformation of paper tubes against external pressure and express them numerically. There is.

[Means for solving problems]

Therefore, the present invention takes into consideration the characteristics of the paper tube, and
The purpose is to provide a device that easily tests the strength and deformation of paper tubes under external pressure. A circumferential pressure testing device for a cylindrical body is provided, in which a cover member having extensibility for blocking fluid is attached to the outer periphery of an object, and the fluid is pressurized without directly contacting the object. 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. Furthermore, the cover member is brought into close contact with 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 maintains a state in close contact with the outer periphery of the test object. The extensibility that can be obtained is sufficient.

[Effect]

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,
Ensures close contact with the outer periphery of the test object. In particular, even when the test object is deformed by pressurization, the cover member expands and deforms in accordance with the deformation of the test object due to its extensibility, and maintains a state in close contact with the outer periphery of the test object.

〔Example〕

Embodiments of the present invention will be described below based on the drawings. 1st
The figure shows a first embodiment of the present invention, and this circumferential pressure testing device has a hollow cylindrical main body 1 and lids 2 provided at both ends thereof. Cylindrical body 1
Disc-shaped lid fixing plates 3, 3 having circular central holes 4, 4 are attached to both ends of the lid body. The lid body fixing plates 3, 3 are screwed 5, 5 onto the inner peripheral surface of the cylindrical main body 1, and are welded 6, 6 at the outer peripheral portions, thereby being fixed in an airtight state. The lids 2, 2 also have a disc shape approximately equal to the outer diameter of the lid fixing plates 3, 3, and have central holes 4, 4 of the lid fixing plates 3, 3.
Paper tube insertion ports 7, 7 having an inner diameter approximately equal to that of the paper tube are opened. The lids 2, 2 are attached to the lid fixing plates 3, 3 from the axial direction with an appropriate number of bolts 8.

Paper tube outer diameter rings 9, 9 are fixed between the lid body fixing plates 3, 3 and the lid bodies 2, 2 in a state where they are sandwiched between the two lid bodies 2, 3. These paper tube outer diameter rings 9, 9 are those having the same outer diameter as the paper tube a to be inspected, and when an object having a smaller outer diameter than the illustrated paper tube a is to be inspected, for example, the two-dot chain line Paper tube outer diameter rings 9, 9 having a small inner diameter are used as shown in FIG. O-rings 10, 10, 11, 11 are attached to the inner peripheral surfaces and inner end surfaces of the paper tube outer diameter rings 9, 9, respectively, and the former O-rings 10, 10 are attached to the lid body fixing plates 3, 3. The latter O-rings 11, 11 maintain 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 12, and the paper tube a is passed from the paper tube insertion opening 7 of the lid 2 at one end to the paper tube insertion opening 7 of the lid 2 at the other end. . This insertion is done after removing the lid 2,
In order to facilitate this insertion, the lid body fixing plates 3, 3
The inner peripheral ends of the lids 2, 2 are chamfered as appropriate.

Paper tube inner diameter rings 13, 13 are inserted into the paper tube a at both ends of its inner peripheral surface. The paper tube inner diameter rings 13, 13 have an outer diameter of the main body portion equal to the inner diameter of the paper tube, and are formed in a flange shape with outer diameters of outer end portions 14, 14 slightly larger. The paper tube inner diameter rings 13, 13 have a strength capable of resisting external pressure applied to the paper tube a, which will be described later, and support the paper tube a against the external pressure. Both paper tube inner diameter rings 13,1
3, there is nothing to support the paper tube a, and both inner ends 15, 15 of the paper tube a
The area is subject to inspection against external pressure. Therefore, the length of the portion to be inspected is the inner end portions 15,
15, and the length of the paper tube inner diameter rings 13, 13 may be changed as necessary. Furthermore, when inspecting paper tubes a having different inner diameters, it is sufficient to use other paper tube inner diameter rings having different outer diameters.

The sheet body 12 described above protects the outer surface of the paper tube when the paper tube is inserted between the two cover bodies 2, 2, and
It works together with the O-ring 11 to improve airtightness. In this embodiment, a synthetic resin film with a thickness of 1 mm was used, but a sheet body having a material and thickness that meets the purpose of the sheet body 12 may be appropriately selected.

In this way, a pressurizing chamber 16 is formed in this circumferential pressure testing device, which is surrounded by the cylindrical body 1, the lid fixing plate 3, the paper tube outer diameter ring 9, and the sheet body 12 on the outer periphery of the paper tube. Fluid is supplied through an inlet 17 provided at an appropriate location on the side wall of the main body 1 (in the center in this embodiment). In this embodiment, water is used as the fluid,
Supply pressurization is performed by a water pressure machine (not shown), and the pressure inside the pressurizing chamber 16 is made high. In addition to water, fluids include
Oil, air, etc. are used as appropriate. As a result, 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'. or,
The strain on the inner peripheral surface of the paper tube a can also be measured by the strain gauge 18.

Here, the sheet body 12 on the outer periphery of the paper tube prevents fluid 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 or the like. Further, even when the paper tube a is deformed as shown in a', the sheet body 12 has extensibility, so that it deforms as shown in 12' 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 affected by the sheet body 12, so accurate measurement is possible.

Next, a second embodiment will be described based on FIG. In this second embodiment, a paper tube b having a relatively small diameter is inspected, and a hollow cylindrical main body 21 has disk-shaped lids 23, 23 having paper tube insertion holes 22, 22 at both ends thereof. It is screwed 24, 24. A cover member is attached to the outer circumference 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 the ring-shaped inner circumferential surface 26 is attached to the outer circumferential surface of the paper tube b. 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 on the outer circumferential surface 27 of the rubber tube 25 (in the embodiment, at the center). In this fluid inlet 28, a cylindrical member 30 having a rubber ring 29 fixed to its base end is passed from the inside to the outside of the outer circumferential surface 27 of the rubber tube, and is screwed onto the inner surface of the socket 31. The fluid inlet 28 is passed to the outside through an inlet 32 formed in the side wall of the cylindrical main body 21 .

Thus, water is pressurized into the interior 33 of the rubber tube 25 via the fluid inlet 28 from a hydraulic machine (not shown). Although the paper tube inner diameter rings 34, 34 may be used as in the first embodiment, they are not necessary when the applied pressure is small. In addition to the rubber tube 25, the elastic hollow body can be changed as appropriate depending on the type and pressure of the fluid.

〔Effect of the invention〕

As mentioned 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 pressurizing fluid, improve the airtightness of the pressurizing chamber, and has the characteristic of being vulnerable to water, etc. The present invention 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 an embodiment of the present invention;
FIG. 2 is a partially sectional side view of another embodiment of the invention. 1, 21... Cylindrical main body, 2, 23... Lid body,
7, 22...Paper tube insertion port, 12...Sheet body, 1
6... Pressure chamber, 25... Rubber tube, a, b...
...Paper tube.

Claims (1)

[Scope of Claims] 1. A cylindrical object that pressurizes the outer periphery of a cylindrical specimen that is likely to undergo deterioration due to direct contact with fluid by means of a fluid supplied into a pressurizing chamber. In a body circumferential pressure testing device, a cylindrical test object is inserted from one end of a pressurized chamber to the other end, a cover member having extensibility for blocking fluid is attached to the outer periphery of the inserted test object, and the above-mentioned method is used. A circumferential pressure testing device for a cylindrical body, characterized in that it is configured to pressurize a fluid without directly contacting the test object. 2. Claim 1, characterized in that the cover member is a sheet body that can be brought into close contact with the outer periphery of the test object.
The circumferential pressure inspection device for a cylindrical body as described in 2. 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 cylindrical body according to claim 1, wherein fluid is supplied into the hollow interior of the elastic hollow body to apply pressure to the outer periphery of the test object. Circumferential pressure inspection device.