JPH081095U - Pipe end face protector for composite pipe - Google Patents

Abstract

(57) [Abstract] [Purpose] The rust and scratches are prevented by covering the end face protection cushioning part which is shaped to be crimped from the root surface to the bevel surface of the composite pipe. [Structure] An end face protection cushioning portion (11) ruled on the back surface of a collar portion (2) of a tubular body (1) capable of expanding the diameter by an expanding mechanism A with respect to an open end of a composite pipe C. Protection surface (1
2), a tubular body so that the rising surface (13) and the taper surface (14) are fitted to the bevel surface E from the root surface D formed on the opening end side of the composite pipe C. (1) is inserted into the composite pipe C, the diameter of the cylindrical body (1) is expanded by the diameter expansion mechanism A, and the outer peripheral surface of the cylindrical body (1) is crimped to the inner surface of the composite pipe C. Fix it.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

The present invention relates to a pipe end face protector for protecting a pipe end face of a composite pipe made of different metals, for example, a composite pipe made of stainless steel and carbon steel.

Conventionally, various types of tube end face protectors have been developed, and examples thereof are shown in Japanese Utility Model Publication No. 61-35169 and Japanese Utility Model Publication No. 2-5699, which are related to the present application. There is something. These protectors have one end of the tubular body formed on the flange, and the guide member is pushed outward by the cotter plate to push and expand the telescopic portion of the tubular body by the pressure, or a hinge is formed between the joint members. By rotating the piercing connecting bolt member, the expanding and contracting portion of the tubular body is pushed and expanded to be crimped inside the pipe, and the flange portion covers the end surface of the pipe.

[0003]

[Problems to be solved by the device]

However, for example, in the case of a composite pipe c made of stainless steel a and carbon steel b as shown in FIG. 7, the cylindrical body is directly attached to the root surface d and the inner surface e formed of the stainless steel a. Also, the flange portions come into contact with each other, and scratches are likely to occur due to contact between the metals, which causes a problem of rust. That is, since relay welding is performed at the time of laying on site, complicated development shape and high groove precision are required, and there is a problem that polishing is required especially at the time of welding due to scratches and rust on the root surface d. Further, in the pressure-bonding of metal to metal, a gap is apt to be generated, and since foreign matter is mixed into the gap or is directly applied to an impact from the outside that occurs during transportation, there is no particular problem due to deformation or loss of the tip. There is a problem such as generation of non-defective products.

In addition, there is a problem that rust occurs due to a potential difference at the time of contact between dissimilar metals due to contact between the inner tube and the tubular body of the tube end face protector. In order to solve the above-mentioned problems, the present invention provides a pipe end face protection tool in which a cushioning member made of rubber or the like is coated on a portion of the composite pipe that contacts the bevel surface and the inner surface of the pipe. The purpose is. ▲

▲

Means for Solving the Problems The above object of the present invention can be achieved by a protector having the following configuration. That is, the gist () is that one end of a tubular body (1) having an opening at both ends is bent outward to form a collar portion (2), and the other end of the tubular body (1) is formed from the collar portion (2). The cross cut part (3 ') is provided over and the both ends of the cut part (▲ 3') are overlapped over the required length to form the expandable part (3), and the inner peripheral wall of the expandable part ▲ (3) is formed. A diametrical expansion mechanism A is provided over (4) and the outer inner peripheral wall (5), and further, on the back surface of the collar portion (2), there is a shape of crimping from the root surface D of the composite pipe to the bevel surface E. End face protection buffer (1
This is an end face protector for a composite pipe, characterized in that 1) is covered. Further, a cushioning member (15) made of rubber or a soft synthetic resin material is covered along the outer peripheral surface of the cylindrical body (1). ▲

▲

[Operation] In the present invention, as shown in FIG. 6, the end face protection cushioning portion (11) covered on the back surface of the collar portion (2) with respect to the opening end of the composite pipe C made of stainless steel and carbon steel. The root protection surface (12), the rising surface (13) and the taper surface (14) of the above are fitted to the bevel surface E from the root surface D formed on the open end side of the composite pipe C.
The tubular body (1) is fitted into the double-joined pipe C. Then, the fastening bolt member (10) is rotated by an electric tool such as an electric screwdriver so that the tops of the expansion members (8) and (8 ') are placed close to each other, whereby the tubular body (1) is formed. The outer diameter of the cylindrical body (1) is fixed to the inner surface of the composite pipe C by crimping it. ▲

Therefore, the outer peripheral surface and the collar portion (2) of the tubular body (1) are fixed to the end surface and the inner surface of the composite pipe C via the end surface protection cushioning member (15), It is possible to prevent scratches due to contact between metal members and rust due to gaps between them, and also to absorb impact force against external shocks during transportation and prevent deformation of the end faces. ▲

▲

Embodiments A pipe end face protector according to the present invention will be described in detail below with reference to the drawings showing the embodiments. ▲ Fig. 1 is a perspective view showing an embodiment of the diameter expanding mechanism of the present invention. ▲ That is, it is a tubular body with both ends open, and a collar portion (2 ▲) is attached to one end of the tubular body (1). This tubular body (1) has a longitudinal direction at one place. The cut portion (3 ') is overlapped with both sides of the cut portion (3') for a required length to form a stretchable portion (3). The diameter expanding mechanism A is provided over the center of the inner inner peripheral wall (4) and the outer inner peripheral wall (5) of the expandable portion (3) of the tubular body (1). In the diameter expansion mechanism A, joint members (6) and (6 ') are fixedly erected by welding, rivets or the like at the centers of the inner inner peripheral wall (4) and the outer inner peripheral wall (5) so as to face each other. Then, between the joint members (6) and (6 '), fastening bolt insertion holes (7) and (7') are opened at the top thereof, and the expansion member (the inner peripheral wall of which has a butterfly shape). 8) and (8 ′) are installed in a confronting manner with ▲, and both ends of the joint member (6),
The pivot pin members (9) and (9 ') are pivotally connected to each other by (6').
Further, the fastening bolt member (10) is inserted through the fastening bolt insertion holes (7) and (7 '). ▲

That is, the expansion member (8) formed in a curved shape toward the outside,
(8 ') is made of a material that is rich in toughness. As shown in FIG. 2, the fastening bolt portion (10) is driven and rotated by an electric tool such as an electric screwdriver from the normal state. , The tops of the expansion members (8), (8 ') are forcibly placed close to each other by the fastening bolt member (10), and the joint members (6), (6') are shown in FIG. The diameter of the cylindrical body (1) is expanded by moving in the direction of arrow B. ▲
Next, as shown in FIG. 4, along the back surface of the collar portion (2) of the tubular body (1), cover the end face protection cushioning portion (11) made of elastic material such as rubber as shown in FIG. It is what I wear. As shown in FIG. 6, the end face protection cushioning part (11) is opened from the inner circumference of the end face protection cushioning part (11) in order to cover the root surface ▲ D of the composite pipe C and the bevel surface E. A root protection surface (12) having a width substantially equal to
Further, from the outer periphery of the above-mentioned route protection surface (12), a rising surface (13) and a tapered surface (1
4) is formed, and at the cut portion (3 ') of the collar portion (2), the end face-protection buffer portion (11) is obliquely cut. As shown in FIG. 4, the outer peripheral wall surface of the cylindrical body (1) is covered with a cushioning material (15) made of rubber or a soft synthetic resin material over the entire surface. . ▲

▲ In this embodiment, the composite pipe made of carbon steel and stainless steel was described in detail, but ▲. In addition to this, the outer pipe is carbon steel, high-strength steel and the inner pipe is stainless steel,
A composite pipe made of a combination of dissimilar metals such as alloy steel and Inconel can be considered.
It goes without saying that the pipe end face protector (1) of the present application is applied to various composite pipes. Further, as the diameter expanding mechanism A, various diameter expanding mechanisms other than the mechanism described in detail in the present embodiment are conceivable, and the present invention is not limited to this, and a mechanism most suitable for the situation is adopted. ▲
Is desirable. ▲

▲

As described above, according to the present invention, for example, the protector itself is fitted into the composite pipe of stainless steel and carbon steel, and the tubular body is expanded by the expanding mechanism. With a strong force, the beveled surface is protected from the root surface of the composite pipe by the end face protection buffer on the back of the collar, and the inner surface of the pipe is protected by the buffer member on the outer peripheral surface of the tubular body. Will be protected in close contact, which will cause scratches and rust,
Furthermore, it is possible to prevent deformation due to external impact.
▲ As a protector of the present invention, of course, several kinds of things are prepared according to the diameter of the target pipe, but it can also be used for pipes having different diameters by adjusting the tightening fittings. ▲

[0012]

[Brief description of drawings]

FIG. 1 is an enlarged explanatory view showing an embodiment of a diameter expanding mechanism of the present invention.

FIG. 2 is an explanatory view showing a starting state of the diameter expansion mechanism of the present invention.

FIG. 3 is an explanatory view showing a diameter expansion state of the diameter expansion mechanism of the present invention.

FIG. 4 is a partially cutaway perspective view showing a tubular body of the present invention.

FIG. 5 is a perspective view of an end face protection cushioning part of the present invention.

FIG. 6 is an explanatory view showing a usage state of the present invention.

FIG. 7 is an explanatory diagram showing a state of an end surface of a composite pipe.

[Explanation of symbols]

 A Expanding mechanism 1 Cylindrical body 2 Collar part 3 Expansion / contraction part 4 Inner inner peripheral wall 5 Outer inner peripheral wall 11 End face protection cushioning part 12 Route protection face 15 Cushioning member

Claims (2)

[Scope of utility model registration request] 1. A tubular body (1) having openings at both ends is bent outward to form a flange portion (2), and the flange portion (2) extends from the flange portion (2) to the other end of the tubular body (1). The cut portion (3 ') is provided, and both ends of the cut portion (3') are overlapped over a required length to form a stretchable portion (3), and an inner inner peripheral wall (4) of the stretchable portion (3) is formed.
Further, a diameter expansion mechanism A is provided on the outer peripheral wall (5) and on the rear surface of the collar (2), an end face protection cushioning portion having a shape of being crimped from the root D surface to the bevel surface E of the composite pipe. (1
A pipe end face protector for a composite pipe, characterized in that 1) is covered. 2. The pipe end face protection for a composite pipe according to claim 1, wherein a cushioning member (15) made of rubber or the like is covered along the outer peripheral surface of the cylindrical body (1). Ingredient