JP3058667U - Swivel joint - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a swivel joint that can be easily maintained and inspected, has a long service life, and has a low production cost even in a poor environment of high temperature and high humidity. SOLUTION: A first coaxially and rotatably combined first.
An annular bearing device provided between the first and second pipe members to rotatably support the first and second pipe members with each other;
The first and second pipe members are provided between the first and second pipe members.
An annular sealing device for forming a fluid-tight seal in an annular gap between the pipe members, wherein the swivel joint rotatably and fluid-tightly connected between the first and second pipe members, wherein the bearing device has wear resistance, A swivel joint characterized by being made of a water-resistant and heat-resistant resin. The bearing device is suitably made of polyethylene. [Effect] A swivel joint that can be easily maintained and inspected, has a long service life, and has a low production cost even in a poor environment of high temperature and humidity can be obtained.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a swivel joint, and more particularly to a swivel joint which is inserted into a cooling water supply pipe for supplying cooling water to a rotating and moving rolling roller and rotatably and fluid-tightly connects two pipe members. .

[0002]

[Prior art]

 Pipes for supplying cooling water must be connected to the rolling rollers used in steel mills, but the rolling rollers move up and down in the stand when receiving, discharging and rolling down the workpiece to be rolled. Have to do. For this reason, a swivel joint is provided at an appropriate position in the cooling water supply pipe so that the pipes can rotate with each other while maintaining a fluid seal.

A swivel joint that has been used is provided between two pipe members coaxially and rotatably combined with each other, and has an annular shape that rotatably supports the two pipe members with each other. A ball bearing, and an annular seal provided between the two tube members to form a fluid-tight seal in an annular gap between the tube members, and rotatably and fluid-tightly connected between the two tube members. Was to do.

[0004]

[Problems to be solved by the invention]

 Ball bearings are used in such swivel joints, and the fluid-tight seal is not always perfect and there is some leakage. Also, due to the high temperature of the surrounding environment, maintenance of the ball bearings is performed relatively frequently. Inspection work is required, but the ball bearings are still damaged in a relatively short period of time, from six months to one year, and need to be replaced. Replacement of ball bearings is a very serious problem in the case of rolling rollers in steelworks because the production lines of steelworks must be stopped.

[0005] Accordingly, an object of the present invention is to provide a swivel joint that is easy to maintain and inspect, has a long life, and is inexpensive to produce even in a poor environment of high temperature and high humidity.

[0006]

[Means for Solving the Problems]

 The swivel joint of the invention is provided with a first pipe member, a second pipe member coaxially and rotatably combined with the first pipe member, and provided between the first and second pipe members. An annular bearing device rotatably supporting the first and second pipe members with each other; and a fluid-tight seal provided between the first and second pipe members in an annular gap between the first and second pipe members. An annular sealing device for forming a seal, wherein the swivel joint rotatably and fluid-tightly connects the first and second pipe members, wherein the bearing device is made of a wear-resistant, water-resistant and heat-resistant resin. A swivel joint characterized by being made.

According to the invention, the resin of the bearing device is polyethylene.

[0008]

[Embodiment of the invention]

 FIG. 1 shows a swivel joint used for a cooling roller cooling pipe as an embodiment of the swivel joint of the present invention. The swivel joint of the present invention includes a first pipe member 1, a second pipe member 2 coaxially and rotatably combined with the first pipe member 1, and a first and second pipe members 1, 2. Are provided between the first and second pipe members 1 and 2, and are provided between the first and second pipe members 1 and 2 to rotatably support the first and second pipe members 1 and 2 with each other. Annular sealing devices 5 and 6 for forming a fluid-tight seal between the first and second pipe members 1 and 2 are provided. With such a configuration, the first pipe member 1 and the second pipe member 2 are connected rotatably and fluid-tightly.

According to the present invention, each of the bearing devices 3 and 4 is an annular member made of a wear-resistant, water-resistant, and heat-resistant resin. A sliding bearing is used between the members to smoothly rotate these members relatively around the axis. The resin may be a resin having abrasion resistance, water resistance and heat resistance suitable for the material of the bearing, but is preferably polyethylene.

In the illustrated example, an opening 11 is provided in a side wall of the first pipe member 1 of the swivel joint, and one end of a pipe 12 extending in a direction perpendicular to the axis is welded to the opening 11 by welding. The other end of the pipe 12 is provided with a flange 13 connected to a pipe (not shown) connected to a rolling roller (not shown). The first pipe member 1 is formed with a through-hole 16 having an inner diameter that differs between the shoulder 14 and the shoulder 15.

A shoulder 17 and a shoulder 18 are also formed on the outer peripheral surface of the second pipe member 2 inserted into the first pipe member 1, and the shoulders 14 and 15 of the through hole 16 of the first pipe member 1 are formed. Are engaged with each other to determine the relative axial position. An end plate 19 is fixed to the left end of the second pipe member 2 inserted into the through hole 16 of the first pipe member 1 with a screw 20, and the second pipe member 2 is connected to the first pipe member by the end plate 19. It does not get out of the member 1.

A cylindrical gap is formed between the through-hole 16 of the first pipe member 1 and the second pipe member 2, and the gap is formed between the first and second pipe members 1 and 2. Annular bearing devices 3 and 4 are provided which rotatably support the two between them. In this example, the bearing device 3 has an annular shape having a substantially rectangular cross section, which is fitted to a small diameter portion 21 provided at one end of the second pipe member 2 and fixed by an end plate 19 so as not to move in the axial direction. It is a resin member that allows the relative rotation between the first tube member 1 and the second tube member 2 around the axis to be smoothly performed. In addition, the bearing device 4 has an annular large shape provided at an end of the through-hole 16 of the first tube member 1 far from the end of the second tube member 2 in which the above-described bearing device 3 is provided. An annular resin member having a substantially rectangular cross section whose axial position is determined by the shoulder portion 18 of the second pipe member 2 and which is fitted in the diameter portion 22, is provided by the first pipe member 1 and the second pipe member 2. This makes the rotation about the relative axis between and smoothly performed. The material of these bearing devices 3 and 4 is a wear-resistant, water-resistant and heat-resistant resin, preferably polyethylene.

A cylindrical gap between the through-hole 16 of the first pipe member 1 and the second pipe member 2 is further provided between the first and second pipe members 1 and 2. Annular sealing devices 5, 6 for sealing the gap fluid-tightly are provided. Each of the sealing devices 5 and 6 is a packing made of nitrile rubber or the like inserted into a circumferential groove provided on the outer periphery of the second pipe member 2.

In the illustrated example, an end of the second pipe member 2 opposite to the end plate 19 is bent at a right angle and connected to an elbow 24 having a flange 23 at the tip. The flange 23 is for connecting to a pipe (not shown) connected to a cooling water supply source (not shown).

[0015]

[Effect of the invention]

 The swivel joint of the present invention has an annular bearing device provided between the first and second pipe members and rotatably supporting the first and second pipe members with respect to each other. Because it is made of resin, it is possible to provide a swivel joint that can be easily maintained and inspected, has a long service life, and has low production costs even in a poor environment of high temperature and high humidity.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a swivel joint of the present invention.

[Explanation of symbols]

1 First pipe member, 2 Second pipe member, 3, 4 Bearing device, 5, 6 Seal device.

Claims (2)

[Utility model registration claims] A first pipe member; a second pipe member coaxially and rotatably combined with the first pipe member; and a first pipe member provided between the first and second pipe members. An annular bearing device rotatably supporting the first and second pipe members, and a fluid-tight seal provided between the first and second pipe members in an annular gap between the first and second pipe members. An annular sealing device to be formed, wherein the first and second pipe members are rotatably and fluid-tightly connected to each other, wherein the bearing device is made of a wear-resistant, water-resistant, heat-resistant resin. A swivel joint characterized by being made. 2. The swivel joint according to claim 1, wherein said resin is polyethylene.