WO2008093967A1

WO2008093967A1 - Regenerating method of dredging sleeve

Info

Publication number: WO2008093967A1
Application number: PCT/KR2008/000456
Authority: WO
Inventors: Chul Ho Moon
Original assignee: Jusung Tech Co., Ltd.
Priority date: 2007-01-30
Filing date: 2008-01-25
Publication date: 2008-08-07
Also published as: KR100796187B1

Abstract

The present invention provides a method of regenerating a dredging sleeve, which includes a hose body, having an inner rubber layer (114) and an outer rubber layer (112), and flanges (130) provided on the respective opposite ends of the hose body. According to the method of regenerating the dredging sleeve, a damaged dredging sleeve, which is discarded in the conventional art, can be regenerated into a new dredging sleeve having superior durability through a simple process. Therefore, there is an advantage in that environmental pollution, attributable to the disposal of damaged dredging sleeves, is prevented.

Description

REGENERATING METHOD OF DREDGING SLEEVE

Technical Field

[1] The present invention relates, in general, to methods of regenerating dredging sleeves and, more particularly, to a method of regenerating a dredging sleeve, which includes a hose body, having an inner rubber layer and an outer rubber layer, and flanges, provided on the respective opposite ends of the hose body, the method comprising the steps of:

[2] a) winding a rubber band around the outer rubber layer of the hose body; b) inserting a rubber tube, which is cut in a longitudinal direction, and to an outer surface of which an adhesive is applied, into the hose body, and closely adhering the rubber tube to the inner rubber layer using a first support member; c) removing rust from outer surfaces of the flanges, and closely adhering rubber plates, each of which has an adhesive applied on one surface thereof, to the respective outer surface of the flanges using a second support member; and drying the dredging sleeve processed through the steps a), b) and c). Background Art

[3] Generally, when dredging the bottom of the sea to make a route for ships or conducting reclamation work, in a dredging ship, a process of lifting earth and sand from the bottom of the sea and of feeding the earth and sand under pressure using a discharge line, which is defined by connecting steel pipes, is conducted.

[4] Here, to prevent the discharge line from being damaged by waves, dredging sleeves made of rubber are interposed between the steel pipes, such that the discharge line can be flexible.

[5] Typically, as shown in FIG. 1, a widely used dredging sleeve 10 includes a hose body 110, which has an outer rubber layer and an inner rubber layer, and flanges 130, which are provided on respective opposite ends of the hose body 110.

[6] However, in the case of the conventional dredging sleeve, when dredged earth and sand, which are fed under pressure through the steel pipes, pass through the dredging sleeve 10, the inner rubber layer of the hose body 110 may be torn by the dredged earth and sand, or, due to vibrations generated by movement of the dredged earth and sand, the outer rubber layer of the hose body 110 may collide with rocks or the like, which are near the discharge line, and thus tear or crack.

[7] Furthermore, the damaged dredging sleeves must be frequently replaced with new ones, and, when the removed dredging sleeves are discarded, environmental pollution results. Disclosure of Invention

Technical Problem

[8] Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a dredging sleeve regenerating method, by which damaged dredging sleeves, which are discarded in the conventional technique, are collected and are regenerated into new dredging sleeves having superior durability through a relatively simple process, thus preventing environmental pollution attributable to the disposal of damaged dredging sleeves.

Technical Solution

[9] In order to accomplish the above object, the present invention provides a method of regenerating a dredging sleeve, including a hose body having an inner rubber layer and an outer rubber layer, and flanges provided on respective opposite ends of the hose body, the method comprising the steps of:

[10] a) winding a rubber band around the outer rubber layer of the hose body;

[11] b) inserting a rubber tube, which is cut in a longitudinal direction, and to an outer surface of which an adhesive is applied, into the hose body, and closely adhering the rubber tube to the inner rubber layer using a first support member;

[12] c) removing rust from outer surfaces of the flanges, and closely adhering rubber plates, each of which is applied on one surface thereof with an adhesive, to the respective outer surface of the flanges using a second support member; and

[13] drying the dredging sleeve processed through the steps a), b) and c).

[14] Preferably, the first support member used at the step b) may include: a nut having on opposite ends thereof internal threads, formed in opposite directions; and bolts engaging at first ends thereof with the respective internal threads of the nut, with a close-contacting plate provided on a second end of each of the bolts, wherein, when the nut is rotated in a direction in which the nut is loosened from the bolts, the bolts are extracted from the nut, so that the close-contacting plates closely adhere the rubber tube to the inner rubber layer.

[15] Furthermore, the second support member used at the step c) may include:

[16] first and second support plates disposed such that the first and second support plates contact outer surfaces of the respective rubber plates, adhered to the respective outer surfaces of the flanges, each of the first and second support plates having at least one coupling hole therein and a through hole in a center thereof;

[17] a bolt, inserted both into the coupling hole of the first support plate and into the coupling hole of the second support plate; and

[18] nuts, threaded on respective opposite ends of the bolt, wherein, when the nuts are rotated in directions in which the nuts are tightened, the first and second support plates closely adhere the rubber plates to the respective flanges.

[19] Particularly, opposite ends of the rubber tube used at the step b) may be configured such that outer diameters thereof are reduced in outward directions. The cut part, which is formed in the rubber tube in a longitudinal direction, may be formed in an oblique direction relative to a radial direction thereof.

Advantageous Effects

[20] A method of regenerating a dredging sleeve according to the present invention can regenerate damaged dredging sleeves, which are discarded in the conventional art, such that they can be reused, thus markedly reducing industrial waste, thereby preventing environmental pollution.

[21] Particularly, a rubber band is wound around an outer rubber layer of a dredging sleeve to be regenerated. A rubber tube, to the outer surface of which an adhesive is applied, is closely adhered to an inner rubber layer of the dredging sleeve using a first support member. Rubber plates are closely adhered to respective flanges of the dredging sleeve using a second support member. In this state, the dredging sleeve is processed by heat treatment. Therefore, the adhesive force between the components is increased, thus markedly enhancing the durability of the dredging sleeve. Brief Description of the Drawings

[22] FIG. 1 is a view illustrating a typical dredging sleeve;

[23] FIG. 2 is a partially broken front view showing the typical dredging sleeve;

[24] FIG. 3 is a view illustrating the step of winding a rubber band around an outer rubber layer of the dredging sleeve, according to the present invention;

[25] FIG. 4 is a view illustrating the rubber band wound around the outer rubber layer according to the present invention;

[26] FIG. 5 is a view illustrating a rubber tube, in which a cut part is formed in a longitudinal direction according to the present invention;

[27] FIG. 6 is a view illustrating the rubber tube disposed in the dredging sleeve according to the present invention;

[28] FIG. 7 is a sectional view taken along the line A-A of FIG. 4;

[29] FIG. 8 is a sectional view taken along the line B-B;

[30] FIG. 9 is a perspective view showing a first support member according to the present invention;

[31] FIG. 10 is a view illustrating the rubber tube, which is closely adhered to an inner rubber layer using the first support member according to the present invention;

[32] FIG. 11 is a view illustrating a rubber plate according to the present invention;

[33] FIG. 12 is a view illustrating a second support member for closely adhering rubber plates to flanges according to the present invention; and

[34] FIG. 13 is a view illustrating the rubber plates, which are closely adhered to the respective flanges using the second support member according to the present invention.

[35] ***Description of the elements in the drawings***

[36] 10: dredging sleeve 110: hose body

[37] 112: outer rubber layer 114: inner rubber layer

[38] 130: flange 310: rubber band

[39] 330: rubber tube 350: first support member

[40] 370: rubber plate 390: second support member

Best Mode for Carrying Out the Invention

[41] Hereinafter, a method of regenerating a dredging sleeve according to a preferred embodiment of the present invention will be described in detail with reference to the following embodiment. The bounds of the present invention are not limited to the following embodiment, and those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention.

[42] FIG. 3 is a view illustrating the step of winding a rubber band 310 around an outer rubber layer 112 of the dredging sleeve 10. FIG. 4 is a view illustrating the rubber band 310, which is wound around the outer rubber layer 112.

[43] The method of regenerating the dredging sleeve 100 according to the embodiment of the present invention includes a rubber band winding step, a rubber tube close- adhering step, a rubber plate close-adhering step and a heat treatment step.

[44] As shown in FIGS. 3 and 4, at the rubber band winding step, after the outer rubber layer 112 of the dredging sleeve 10 to be regenerated is cleaned and dried, the rubber band 310 is wound around the outer rubber layer 112.

[45] Here, to reliably protect the outer rubber layer 112 of the dredging sleeve 10 from the surroundings, for example, to prevent it from being damaged by colliding with a rock, the rubber band 310 preferably contains cords such as those used in tires. Furthermore, preferably, to firmly adhere the rubber band 310 to the outer rubber layer 112, adhesive is applied to the inner surface of the rubber band 310 before it is wound around the outer rubber layer 112 of the dredging sleeve 10.

[46] Styrene-butadiene rubber adhesive, nitrile rubber adhesive, chloroprene adhesive, vinyl pyridine rubber adhesive, etc. may be used as the adhesive for adhering the rubber band to the outer rubber layer, but the adhesive is not limited to those.

[47] FIG. 5 is a perspective view illustrating a rubber tube 330, in which a cut part 332 is formed in a longitudinal direction. FIG. 6 is a sectional view illustrating the rubber tube 330, which is disposed in the dredging sleeve 10. [48] Next, at the rubber tube close-adhering step, to reinforce an inner rubber layer (114 of FIG. 2) of the dredging sleeve 10, the rubber tube 330 is closely adhered to the inner rubber layer (114 of FIG. 2), to which the adhesive is applied.

[49] Preferably, as shown in FIG. 5, the rubber tube 330 is cut in a longitudinal direction such that it can be efficiently closely adhered to the inner rubber layer (114 of FIG. 2). Furthermore, it is preferable that the outer diameter of the rubber tube 330 be greater than the inner diameter of the inner rubber layer (114 of FIG. 2). The reason for this is to prevent any portion of the rubber tube 330 from not being closely adhered to the inner rubber layer (114 of FIG. 2) due to contraction of the rubber tube 330 during heat treatment.

[50] FIG. 7 is a sectional view taken along the line A-A of FIG. 5. FIG. 8 is a sectional view taken along the line B-B of FIG. 5.

[51] As shown in FIG. 7, when seen in the sectional view, the cut part 332 is preferably formed in the rubber tube 330 in an oblique direction with respect to the radial direction of the rubber tube 330. In this case, when the rubber tube 330 is closely adhered to the inner rubber layer (114 of FIG. 2) such that parts of the cut part 332 overlap each other, the contact area between the parts of the cut part 332 of the rubber tube 330 is increased. Therefore, the cut part 332 is prevented from being easily loosened by dredged earth and sand, which move through the rubber tube 330.

[52] As shown in FIG. 8, opposite ends 334 of the rubber tube 330 are configured such that the outer diameter thereof is reduced in an outward direction. This shape can prevent the opposite ends 334 of the rubber tube 330 from colliding with dredged earth and sand, which are moved under pressure, thus preventing the opposite ends of the rubber tube 330 from being undesirably removed from the inner rubber layer (114 of FIG. 2).

[53] FIG. 9 is a perspective view illustrating a first support member 350. FIG. 10 is a view illustrating the rubber tube 330, which is closely adhered to the inner rubber layer (114 of FIG. 2) using the first support member 350.

[54] As shown in FIG. 10, the rubber tube 330 is closely adhered to the inner rubber layer (114 of FIG. 2) using at least one first support member 350.

[55] As shown in FIG. 9, the first support member 350 includes a nut 352, which has on the opposite ends thereof internal threads, formed in opposite directions, and bolts 354, which engage at first ends thereof with the respective internal threads of the nut 352. Furthermore, a close-contacting plate 356 is provided on a second end of each bolt 354.

[56] The first support member 350 is disposed inside the rubber tube 330 at a predetermined position, at which the rubber tube 330 is closely adhered to the inner rubber layer (114 of FIG. 2). Thereafter, when the nut 352 of the first support member 350 is rotated in a direction in which it is loosened from the bolts 354, the bolts 354 are extracted from the nut 352. Then, the close-contacting plates 356 compress the rubber tube 330, such that the rubber tube 330 is closely adhered to the inner rubber layer (114 of FIG. 2).

[57] FIG. 11 is a view illustrating a rubber plate 370. FIG. 12 is a view illustrating a second support member for closely adhering rubber plates 370 to flanges 130 of the dredging sleeve. FIG. 13 is a view illustrating the rubber plates 370, which are closely adhered to the respective flanges 130 using the second support member.

[58] At the rubber close- adhering step, rust is removed from the outer surfaces of the flanges 130 of the dredging sleeve 10 to be regenerated, and, thereafter, a rubber plate 370, to one surface of which adhesive is applied, is adhered to the outer surface of each flange 130.

[59] As shown in FIG. 11, coupling holes 372 are formed through each rubber plate 370 at positions corresponding to coupling holes, which are formed through the corresponding flange 130. A through hole 374 corresponding to a through hole of the flange 130 is formed at a central portion through the rubber plate 370.

[60] After adhesive is applied to one surface of each rubber plate 370 having the above shape, the rubber plate 370 is adhered to the corresponding flange 130.

[61] At this time, in order to closely adhere the rubber plate 370 to the flange 130, the second support member 390 is used.

[62] As shown in FIG. 12, the second support member 390 includes first and second support plates 392 and 394, each of which has at least one coupling hole 392a, 394a therein. Furthermore, the second support member 390 further includes a bolt 396, which is inserted both into the coupling hole 392a of the first support plate 392 and into the coupling hole 394a of the second support plate 394, and nuts 398, which are threaded on respective opposite ends of the bolt 396.

[63] In a state in which the first support plate 392 and the second support plate 394 are disposed outside the respective rubber plates 370, as shown in FIG. 12, the bolt 396 is inserted both into the coupling hole 392a of the first support plate 392 and into the coupling hole 394a of the second support plate 394, and the nuts 398 are threaded on the bolt 396 in directions in which they are tightened. Then, the rubber plates 370 are closely adhered to the respective flanges 130, as shown in FIG. 13.

[64] At the heat treatment step, to effectively dry the adhesive, which is applied to the rubber tube 330 and the rubber plates 370, and thus to increase the adhering force, a heat treatment process is conducted at a temperature ranging from 6O⁰C to 16O⁰C, typically, but, the temperature for the heat treatment may vary depending on the kind of adhesive.

[65] Furthermore, the heat treatment may be conducted, for example, using hot blast, steam, far infrared rays, etc. As such, the method of the heat treatment is not limited to any special method.

[66] The rubber band 310 is contracted by the heat treatment and is further strongly adhered to the outer rubber layer 112. Furthermore, because the heat treatment is conducted in the state in which the rubber tube 330 and the rubber plates 370 are respectively compressed by the first support member 350 and the second support member 390, the rubber tube 330 and the rubber plates 370 are more strongly adhered to the inner rubber layer (114 of FIG. 2) and the flanges 130, respectively, by the increased adhering force of the adhesive.

[67] After the heat treatment step has been conducted, the first support member 350 and the second support member 390 are removed, thus completing the regeneration of the dredging sleeve 10. Industrial Applicability

[68] The method of regenerating a dredging sleeve according to the present invention makes it possible to regenerate and reuse dredging sleeves, which are discarded in the conventional art, thus markedly reducing industrial waste, thereby preventing environmental pollution.

Claims

[1] A method of regenerating a dredging sleeve, including a hose body having an inner rubber layer and an outer rubber layer, and flanges provided on respective opposite ends of the hose body, the method comprising the steps of: a) winding a rubber band around the outer rubber layer of the hose body; b) inserting a rubber tube, which is cut in a longitudinal direction, and to an outer surface of which an adhesive is applied, into the hose body, and closely adhering the rubber tube to the inner rubber layer using a first support member; c) removing rust from outer surfaces of the flanges, and closely adhering rubber plates, each of which is applied on one surface thereof with an adhesive, to the respective outer surface of the flanges using a second support member; and drying the dredging sleeve processed through the steps a), b) and c).

[2] The method of regenerating the dredging sleeve according to claim 1, wherein the first support member used at the step b) comprises: a nut having on opposite ends thereof internal threads, formed in opposite directions; and bolts engaging at first ends thereof with the respective internal threads of the nut, with a close-contacting plate provided on a second end of each of the bolts, wherein, when the nut is rotated in a direction in which the nut is loosened from the bolts, the bolts are extracted from the nut, so that the close- contacting plates closely adhere the rubber tube to the inner rubber layer.

[3] The method of regenerating the dredging sleeve according to claim 2, wherein the second support member used at the step c) comprises: first and second support plates disposed such that the first and second support plates contact outer surfaces of the respective rubber plates, adhered to the respective outer surfaces of the flanges, each of the first and second support plates having at least one coupling hole therein and a through hole in a center thereof; a bolt, inserted both into the coupling hole of the first support plate and into the coupling hole of the second support plate; and nuts, threaded on respective opposite ends of the bolt, wherein, when the nuts are rotated in directions in which the nuts are tightened, the first and second support plates closely adhere the rubber plates to the respective flanges.

[4] The method of regenerating the dredging sleeve according to claim 1 or 2, wherein opposite ends of the rubber tube used at the step b) are configured such that outer diameters thereof are reduced in outward directions.

[5] The method of regenerating the dredging sleeve according to claim 4, wherein the cut part, which is formed in the rubber tube in a longitudinal direction, is formed in an oblique direction relative to a radial direction thereof.