Surface layer finishing device and surface layer finishing method for cable flexible joint

Abstract

The invention relates to a cable flexible joint surface layer finishing device and a surface layer finishing method, a main body part is provided with a containing space, the containing space is used for containing a target object, a rolling part is movably assembled on the main body part, the rolling part is provided with a rolling surface, and the rolling surface of the rolling part is used for being in rolling contact with the surface layer of the target object in the containing space. Therefore, rolling pressure is applied to the surface layer of the target object. On the basis of the synergistic effect of temperature and pressure, the adhesive force between semiconductive particles generated by polishing and a shielding layer of a recovery conductor can be enhanced, migration of semiconductive powder scraps in the extrusion molding process of an insulating material can be effectively reduced, the risk that the semiconductive powder scraps are mixed into an insulating layer is reduced, and meanwhile the surface roughness is effectively reduced on the premise that the forming period is remarkably shortened. The temperature field acts on the outer surface of the recovered conductor shielding layer in the circumferential direction, the size details of the recovered conductor shielding layer can be reserved, and meanwhile roughness caused by polishing is reduced. Due to the design of a plurality of circumferential roller type rolling parts, the problem that a joint line is formed at a parting surface of a traditional mold is solved.

Description

Technical Field

[0001] The present application relates to the technical field of submarine cables, and in particular to a surface finishing device and a surface finishing method for a flexible joint for a cable. Background Art

[0002] With the development of the marine economy, the investment and construction of a series of key projects such as offshore wind power and island power grid interconnection, the number of submarine cables laid and put into operation has increased rapidly. In the structure of high-voltage submarine cables, in order to homogenize the electric field on the outer surface of the conductor core and avoid local discharge between the conductor part and the insulation part due to the uneven surface of the conductor and the air gap caused by the twisting of the conductor core, a conductor shielding layer is introduced between the conductor core and the insulation layer. Therefore, the flatness of the surface of the conductor shielding layer directly determines the electric field distortion in the insulation layer. In the process of submarine cable production, the conductor shielding layer is extruded together with the insulation layer by a multi-layer co-extrusion method to form a uniform submarine cable core. The surface of the conductor shielding layer is smooth and has no obvious burrs.

[0003] However, due to the limitation of the length of submarine cable manufacturing, the maximum length of a single submarine cable is 20km to 30km, while the distance between islands or sea-based facilities and the mainland is hundreds of kilometers, which cannot meet the requirements of deep sea power transmission. Therefore, an intermediate joint is needed to connect the two sections of submarine cables to ensure the continuity and reliability of the cable system. The reliability of the cable joint becomes the key to the normal and reliable operation of the entire submarine cable transmission system. This joint is called a submarine cable soft joint.

[0004] In the existing submarine cable flexible joint manufacturing process, a method of restoring from the inside out and layer by layer is usually adopted, such as conductor welding, conductor shielding layer restoration, insulation layer extrusion and vulcanization, insulation shielding layer restoration, sheath restoration and other steps. In the process of vulcanization of the material for the conductor shielding layer restoration, it is inevitable that there will be uneven surfaces such as overflow at both ends and the mold line formed at the mold joint. In the current flexible joint manufacturing process, the surface finish of the restored conductor shielding layer is mainly improved by surface post-treatment processes such as grinding and polishing. However, the grinding process will produce a large amount of tiny and difficult-to-remove semi-conductive grinding powder. The semi-conductive powder is very easy to mix into the insulation layer during the extrusion molding of the submarine cable flexible joint insulation material, which brings great risks to the insulation performance of the material. In addition, in order to obtain an ideal surface finish, the grinding and polishing cycle will increase significantly. Therefore, it is very critical to suppress the migration of semi-conductive powder while achieving the improvement of the finish of the restored conductor shielding layer to ensure the reliability of the submarine cable flexible joint. Summary of the invention

[0005] Based on this, it is necessary to provide a surface finishing device and a surface finishing method for a flexible joint for a cable in response to the above-mentioned technical problems.

[0006] The present application provides a surface finishing device for a flexible joint for a cable, the surface finishing device for a flexible joint for a cable comprising:

[0007] A main body, wherein the main body has a storage space, and the storage space is used to accommodate a target object;

[0008] A rolling portion is movably mounted on the main body, and has a rolling surface. The rolling surface of the rolling portion is used to roll in contact with the surface of the target object in the storage space, thereby applying rolling pressure to the surface of the target object.

[0009] In one embodiment, the storage space is located inside the main body, the main body defines a first direction, and the storage space passes through the opposite ends of the main body along the first direction; in the first direction of the main body, at least a portion of the space cross-section of the storage space perpendicular to the first direction has the same cross-sectional shape.

[0010] In one embodiment, the rolling portion is fixedly rotatably mounted on the main body, the fixed-axis rotation axis of the rolling portion is coplanar with the first direction, and at least a portion of the rolling portion is placed in the receiving space, so that the rolling portion can circulate different surface areas of its rolling surface into the receiving space based on its own fixed-axis rotation, thereby applying rolling pressure to the surface layer of the target object; and / or,

[0011] In a first direction of the main body, all space cross sections of the storage space perpendicular to the first direction have the same cross-sectional shape, and the storage space is in the shape of a cylindrical channel.

[0012] In one of the embodiments, the storage space of the main body is configured as a deformable space with adjustable radial dimensions.

[0013] In one embodiment, the main body includes a first unit part and a second unit part, the first unit part has a first unit space, the first unit space has a first space opening, the second unit part has a second unit space, the second unit space has a second space opening, the first unit part and the second unit part are assembled to each other through a connecting component, the first space opening of the first unit space and the second space opening of the second unit space are arranged relative to each other, the first unit space of the first unit part and the second unit space of the second unit part together constitute the storage space of the main body, and the assembly distance between the first unit part and the second unit part can be adjusted by the connecting component, thereby adjusting the radial size of the storage space.

[0014] In one embodiment, the connection assembly includes a connection element and an elastic element, the first unit portion and the second unit portion are movably connected via the connection element, the first unit portion and the second unit portion are elastically connected to each other via the elastic element, and the assembly distance between the first unit portion and the second unit portion can be elastically adjusted via the elastic element; and / or,

[0015] At least one of the first unit part and the second unit part is provided with a gripping element.

[0016] In one embodiment, the number of the rolling parts is set to be several, and the several rolling parts are movably assembled on the main body around the storage space of the main body, and the rolling surfaces of the several rolling parts are used to simultaneously make rolling contact with the surface of the target object in the storage space, thereby simultaneously applying rolling pressure to the surface of the target object.

[0017] In one embodiment, at least a portion of the rolling portion is structured as a rotating body, the circumferential side wall of the rotating body constitutes the rolling surface of the rolling portion, the central axes of several of the rolling portions are arranged parallel to each other, and the central axes of several of the rolling portions are all coplanar with the first direction of the main body.

[0018] In one embodiment, the surface finishing device for the flexible joint of the cable comprises:

[0019] a soft material layer, the soft material layer being arranged on the rolling surface of the rolling portion; and / or,

[0020] The heating unit is used to heat the target object so that the surface layer of the target object melts.

[0021] The present application provides a surface finishing method, which is performed based on the surface finishing device for a flexible joint for a cable, and the surface finishing method comprises:

[0022] Raising the surface temperature of the target object, causing the surface of the target object to melt;

[0023] A rolling pressure is applied to the surface layer of the target object, and the surface layer of the target object in a molten state is flattened based on the rolling pressure.

[0024] In the above-mentioned surface finishing device and surface finishing method for flexible connectors for cables, the synergistic effect of temperature and pressure can enhance the adhesion between the semi-conductive particles produced by grinding and the restored conductor shielding layer, which can effectively reduce the migration of semi-conductive powder chips during the extrusion of insulating materials and reduce the risk of mixing into the insulating layer. At the same time, the surface roughness can be effectively reduced under the premise of significantly reducing the molding cycle. The temperature field acts circumferentially on the outer surface of the restored conductor shielding layer, which can retain the dimensional details of the restored conductor shielding layer and reduce the roughness caused by grinding. The design of several rolling parts of the circumferential roller type solves the problem of forming a parting line at the parting surface of the traditional mold. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] FIG1 is a three-dimensional schematic diagram of a surface finishing device for a flexible joint for a cable provided in one embodiment of the present application.

[0026] FIG. 2 is a schematic diagram of a part of the rolling portion of the surface finishing device for a flexible cable joint as shown in FIG. 1 , in which a soft material layer is not provided.

[0027] FIG3 is a three-dimensional schematic diagram of a cable flexible joint surface finishing device provided by an embodiment of the present application from another perspective.

[0028] FIG. 4 is a planar exploded schematic diagram of a surface finishing device for a flexible joint for a cable provided in one embodiment of the present application.

[0029] FIG5 is a three-dimensional schematic diagram of the conductor shielding layer after restoration during the formation of a submarine cable flexible joint provided by an embodiment of the present application.

[0030] 6 is a schematic diagram of the use of a cable flexible joint surface finishing device provided by an embodiment of the present application in finishing a submarine cable flexible joint to restore the surface of a conductor shielding layer.

[0031] Figure Number:

[0032] 10. Conductor; 20. Conductor shielding layer; 30. Cable insulation layer; 40. Cable insulation shielding layer;

[0033] 1000, main body; 2000, rolling part; 3000, connecting assembly;

[0034] 1000a, storage space; 1000b, first direction; 1100, first unit portion; 1100a, first unit space; 1200, second unit portion; 1200a, second unit space; 1300, holding element;

[0035] 2100, soft matter layer;

[0036] 3100. Connecting element; 3200. Elastic element. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] Referring to FIGS. 1 to 4 , the present application provides a surface finishing device for a flexible joint for a cable, and the surface finishing device for a flexible joint for a cable includes a main body 1000 and a rolling part 2000. Among them, the main body 1000 is configured to have a storage space 1000a, and the storage space 1000a can be configured to accommodate a target object. Therefore, the storage space 1000a can be specifically constructed according to the shape, size and other characteristics of the target object, so that the target object can be adaptively accommodated in the storage space 1000a. In one embodiment, the target object can be selected as a submarine cable flexible joint, and the structure shown in FIG5 is a three-dimensional schematic diagram of the conductor shielding layer after the restoration of the submarine cable flexible joint molding process. The submarine cable flexible joint is used to connect the two ends of the submarine cable, and the submarine cable is composed of a conductor 10, a conductor shielding layer 20, a cable insulation layer 30 and a cable insulation shielding layer 40 from the inner layer to the outer layer.

[0044] It should be noted that the conductor shielding layer 20 at the end as shown in FIG5 is the original conductor shielding layer 20 of the cable, and the conductor shielding layer 20 located between the two ends is the conductor shielding layer 20 newly made when the flexible joint is made, which belongs to the restored conductor shielding layer 20. Therefore, although both are conductor shielding layers 20, they can be respectively called the original conductor shielding layer 20 and the restored conductor shielding layer 20. In the manufacturing process of the submarine cable flexible joint, it is necessary to improve the surface finish of the restored conductor shielding layer 20, so the surface layer of the target object is the surface layer of the restored conductor shielding layer 20 connected between the two ends of the submarine cable in FIG5. The corresponding parts of the full text make this distinction between the conductor shielding layers 20 of different parts based on the above description.

[0045] According to the cylindrical structure of the submarine cable flexible joint, in one embodiment, the storage space 1000a can be defined as being located inside the main body 1000, as shown in FIG1 . At this time, the main body 1000 can be defined with a first direction 1000b, and the storage space 1000a passes through the opposite ends of the main body 1000 along the first direction 1000b, thereby forming a channel space that can pass through the main body 1000, so as to meet the needs of the conductor shielding layer 20 (hereinafter referred to as "the restored conductor shielding layer 20") located in the middle of the submarine cable flexible joint and needing to be restored to pass through the storage space 1000a formed inside the main body 1000, as shown in the usage state of FIG6 . Moreover, if it is limited that the storage space 1000a of the main body 1000 can be cut off perpendicularly to the first direction 1000b to form a spatial cross-section, the spatial cross-section at this time is a virtual cross-section, because the storage space 1000a itself is a virtual space. Therefore, the spatial cross-section obtained by cutting the storage space 1000a perpendicularly to the first direction 1000b is only used for the spatial cross-sectional shape of the surface storage space 1000a, and is not a solid cross-section.

[0046] Based on the above definition, in the first direction 1000b of the main body 1000, there will be countless spatial cross-sections of the storage space 1000a that are perpendicular to the first direction 1000b. At this time, it can be defined that the cross-sectional shapes of at least a part of the spatial cross-sections of the storage space 1000a that are perpendicular to the first direction 1000b are the same, that is, at least a part of the spatial structure of the storage space 1000a can be formed into a roughly cylindrical channel that passes through the main body 1000 along the first direction 1000b. The cylindrical channel can be a regular cylindrical channel, such as a cylindrical channel, an elliptical cylindrical channel, etc., or the cylindrical channel can also be constructed as other irregular cylindrical channels according to actual needs. Those skilled in the art can select according to actual needs, and no limitation is made here.

[0047] In one embodiment, it can be defined that in the first direction 1000b of the main body 1000, the cross-sectional shapes of all spatial cross-sections of the storage space 1000a perpendicular to the first direction 1000b are the same, thereby defining the overall shape of the storage space 1000a as a roughly cylindrical channel that passes through the main body 1000 along the first direction 1000b. Those skilled in the art can set the shape of the storage space 1000a according to the actual shape of the "recovery conductor shielding layer 20", which is not limited here.

[0048] In addition, when the target object is not a submarine cable flexible joint, the storage space 1000a of the main body 1000 may also be constructed into other spatial shapes according to the shapes, sizes, etc. of other target objects. For example, the storage space 1000a may not be set inside the main body 1000, but may be set on the surface of the main body 1000, thereby forming a groove-shaped storage space 1000a instead of a channel-shaped storage space 1000a. The present application does not limit the specific content of the storage space 1000a, and those skilled in the art may make targeted adjustments to the storage space 1000a of the main body 1000 according to the actual situation of the target object.

[0049] Furthermore, in one embodiment, the storage space 1000a of the main body 1000 may also be configured as a deformable space with adjustable radial dimensions, for example, the main body 1000 may be structurally configured as a mechanism capable of undergoing structural changes, and the deformation of the storage space 1000a is achieved through the deformation of the mechanism of the main body 1000. In addition, the main body 1000 may also achieve the deformation of the storage space 1000a in other ways, for example, the main body 1000 adopts a memory metal structure, and then the deformation of the storage space 1000a is achieved under the control of different temperatures or other different influencing factors, or the main body 1000 may control the deformation of the storage space 1000a under the application of external force, or other reasonable ways, and those skilled in the art may set the main body 1000 according to actual needs, which is not limited here.

[0050] As shown in FIG. 4 , the main body 1000 may be configured in the form of a frame. In one embodiment, the main body 1000 includes a first unit portion 1100 and a second unit portion 1200. The first unit portion 1100 has a first unit space 1100a, and the first unit space 1100a has a first space opening. The second unit portion 1200 has a second unit space 1200a, and the second unit space 1200a has a second space opening. The first unit portion 1100 and the second unit portion 1200 are both configured in the form of a frame. Therefore, the first unit space 1100a and the second unit space 1200a are spaces enclosed by the first unit portion 1100 and the second unit portion 1200 in the form of a frame. The first unit space 1100a and the second unit space 1200a are not sealed spaces. The first space opening of the first unit space 1100a is the opening facing downward in FIG. 4 , and the second space opening of the second unit space 1200a is the opening facing upward in FIG. 4 .

[0051] The first unit part 1100 and the second unit part 1200 can be assembled with each other through the connecting component 3000. At this time, the first space opening of the first unit space 1100a and the second space opening of the second unit space 1200a are arranged relatively to each other, so that the first unit space 1100a of the first unit part 1100 and the second unit space 1200a of the second unit part 1200 can be spliced ​​with each other to jointly constitute the storage space 1000a of the main body 1000. Since the main body 1000 is divided into two parts, the first unit part 1100 and the second unit part 1200, when the first unit part 1100 and the second unit part 1200 are assembled with each other through the connecting component 3000, the assembly distance between the first unit part 1100 and the second unit part 1200 can be adjusted through the connecting component 3000. When the assembly distance between the first unit part 1100 and the second unit part 1200 changes, the distance between the first unit space 1100a and the second unit space 1200a is affected, so that the spacing space between the first unit space 1100a and the second unit space 1200a changes, and the spacing space is either increased or decreased, thereby adjusting the radial dimension of the storage space 1000a.

[0052] It can be seen that the dimensional deformation of the storage space 1000a at this time depends on the change in the spacing space size caused by the change in the distance between the first unit space 1100a and the second unit space 1200a, and the space size of the first unit space 1100a and the second unit space 1200a itself does not change.

[0053] In the above structure, the first unit 1100 and the second unit 1200 can carry the target object together, and the first unit 1100 and the second unit 1200 have a detachable function. The first unit 1100 and the second unit 1200 realize the closing and opening of the main body 1000 through the connecting assembly 3000, which is convenient for installing the target object in the storage space 1000a of the main body 1000. At the same time, the first unit 1100 and the second unit 1200 can control the clamping force applied to the target object through the connecting assembly 3000. In addition, the main body 1000 can also be designed to control the closing and opening between the first unit 1100 and the second unit 1200 through the lever principle, pneumatic control principle or other various methods.

[0054] The connection assembly 3000 can realize the assembly connection of the first unit part 1100 and the second unit part 1200 by various methods such as snap-fit ​​assembly and threaded assembly. For example, in one embodiment, the connection assembly 3000 may include a connection element 3100 and an elastic element 3200. The connection element 3100 may be a threaded member such as a bolt, and the elastic element 3200 may be a spring, a spring, etc. The first unit part 1100 and the second unit part 1200 are movably connected through one or more connection elements 3100. The first unit part 1100 and the second unit part 1200 are elastically connected to each other through one or more elastic elements 3200. At this time, the elastic element 3200 can apply elastic force between the first unit part 1100 and the second unit part 1200. Therefore, the assembly distance between the first unit part 1100 and the second unit part 1200 can be elastically adjusted by the elastic element 3200, and the opening of the main body part 1000 can also be assisted. At least one of the first unit portion 1100 and the second unit portion 1200 is provided with a gripping element 1300 for an operator to grip and control the first unit portion 1100 and the second unit portion 1200 .

[0055] Continuing to refer to FIGS. 1 to 4 , the rolling part 2000 is movably mounted on the main body 1000, for example, the movably mounted rolling part 2000 can be configured to be rotatably mounted on the main body 1000. The rolling part 2000 is configured to have a rolling surface, and based on the movably mounted rolling part 2000 relative to the main body 1000, the rolling part 2000 can perform movably movements such as rotation relative to the main body 1000, thereby making the rolling surface of the rolling part 2000 roll in contact with the surface layer of the target object in the storage space 1000a, and during the rolling contact between the two, the rolling part 2000 will form a certain degree of pressure on the surface layer of the target object, and the pressure can be adjusted according to actual conditions, thereby applying rolling pressure to the surface layer of the target object.

[0056] Rolling pressure generally refers to the pressure exerted by structures such as rollers or drums on the contact surface, which is a force generated by the action of the load. Therefore, in the present application, the rolling part 2000 acts as the main body for applying the load, and the rolling surface of the rolling part 2000 rolls in contact with the surface of the target object, thereby applying rolling pressure to the surface of the target object.

[0057] Referring to FIG. 1 , in one embodiment, the rolling portion 2000 may be defined as being assembled on the main body 1000 in a fixed-axis rotation manner along a fixed-axis rotation axis, and the fixed-axis rotation axis of the rolling portion 2000 is coplanar with the first direction 1000b. For example, when the first direction 1000b is set as a direction reference line, the fixed-axis rotation axis and the direction reference line of the first direction 1000b are parallel to each other. At this time, the storage space 1000a is located inside the main body 1000, and the rolling portion 2000 may be arranged outside the main body 1000, so that at least a portion of the rolling portion 2000 may be placed in the storage space 1000a, so that at least a portion of the rolling surface of the rolling portion 2000 may also be placed in the storage space 1000a. Since the rolling part 2000 is a movable assembly that rotates on a fixed axis, as long as at least a portion of the rolling part 2000 and at least a portion of the rolling surface are placed in the storage space 1000a, the rolling part 2000 can circulate different surface areas of its rolling surface into the storage space 1000a based on its own fixed-axis rotation, thereby continuously applying rolling pressure to the surface of the target object.

[0058] As shown in FIGS. 1 to 4 , in one embodiment, the number of rolling parts 2000 is set to be several, and several rolling parts 2000 are movably assembled on the main body 1000 around the storage space 1000a of the main body 1000. The several rolling parts 2000 can be assembled on the main body 1000 in a fixed-axis rotation manner based on the above-mentioned method, so that the rolling surfaces of the several rolling parts 2000 can be used to simultaneously roll with the surface of the target object in the storage space 1000a, thereby simultaneously applying rolling pressure to the surface of the target object. In one embodiment, at least a part of the structure or the entire structure of the rolling part 2000 can be set as a rotating body, and the rotating body can include, for example, a cylinder, etc. The circumferential side wall of the rotating body can constitute the rolling surface of the rolling part 2000, and the central axes of the several rolling parts 2000 are arranged parallel to each other, and the central axes of the several rolling parts 2000 are all coplanar with the first direction 1000b of the main body 1000. For example, when the first direction 1000 b is set as a direction reference line, the central axis of each rolling portion 2000 is parallel to the direction reference line of the first direction 1000 b.

[0059] Continuing to refer to FIG. 1 and FIG. 2, in one embodiment, a soft material layer 2100 may be provided on the rolling surface of the rolling portion 2000. In FIG. 2, the soft material layer 2100 is removed from some of the rolling portions 2000, indicating the assembly relationship between the soft material layer 2100 and the rolling portion 2000. If the soft material layer 2100 covers the rolling surface of the rolling portion 2000, the rolling surface of the rolling portion 2000 will indirectly roll with the surface of the target object with the help of the soft material layer 2100. The soft material sleeve may be made of elastomer, rubber and plastic, such as silicone rubber, polytetrafluoroethylene and other soft material materials, so that it can be better bonded to the outer surface of the "recovery conductor shielding layer 20", and it does not adhere to the base material of the "recovery conductor shielding layer 20". In a specific scenario, the soft material sleeve can be removed, retaining the polished rolling portion 2000, and the outer contour is determined according to the outer surface of the "recovery conductor shielding layer 20".

[0060] Considering the low thermal conductivity of the soft material sleeve, the thickness of the soft material sleeve can be controlled within a range of 0.5 mm to 2 mm, ensuring that the soft material sleeve can play a buffering role between the rolling part 2000 and the "recovery conductor shielding layer 20", and ensure perfect fit to the surface of the "recovery conductor shielding layer 20". When the soft material sleeve is not required in a specific scenario, the rolled surface of the rolling part 2000 needs to be polished to ensure a smooth surface.

[0061] After the target object is set in the storage space 1000a, the rolling surfaces of several rolling parts 2000 are in contact with the surface of the target object to fix the target object. The target object is kept different. For example, when the target object is a submarine cable flexible joint, the submarine cables at both ends are fixed, thereby keeping the "restoration conductor shielding layer 20" in the storage space 1000a stationary. The main body 1000 is rotated circumferentially relative to the target object. At this time, the rolling parts 2000 will roll with the surface of the "restoration conductor shielding layer 20". At this time, rolling pressure can be applied to the surface of the "restoration conductor shielding layer 20" at the same time through the rolling surfaces of several rolling parts 2000.

[0062] In this process, the heating unit can be used to heat the target object, causing the surface layer of the target object to melt. For example, the heating unit can be connected to the rolling part 2000, thereby increasing the temperature of the rolling part 2000. When the rolling surface of the rolling part 2000 contacts the surface layer of the target object, the rolling part 2000 will transfer heat to the surface layer of the target object, thereby heating the target object, and the surface layer of the target object is melted by controlling the temperature range. For example, when the target object is a submarine cable flexible joint, the heating state can be controlled to ensure that the base material at the surface thin layer of the "recovery conductor shielding layer 20" is melted, for example, heated to 95°C to 150°C.

[0063] Alternatively, in another embodiment, when the rolling part 2000 is rotatably assembled on the main body 1000 via the rotating shaft, the heating unit can also be arranged inside the rotating shaft as required. For example, the heating unit can be a heating wire, a heating rod, etc., which can be built inside the rotating shaft, or the heating unit can also be set to other shapes or structures as required, so as to be built inside the rotating shaft according to the requirements of manufacturing or assembly convenience.

[0064] Therefore, at this time, the heating object of the heating unit is the rotating shaft that cooperates with the rolling part 2000. By heating the rotating shaft, the rotating shaft can be used as a medium to transfer heat to the rolling part 2000. This heat transfer method is from the inside to the outside, and can transfer heat to the rolling part 2000 more evenly, forming a uniform heating effect in the circumferential direction of the rolling part 2000.

[0065] At this time, the heating temperature of the rolling part 2000 acts on the surface of the "recovery conductor shielding layer 20", causing the surface of the "recovery conductor shielding layer 20" to melt, and at the same time, the pressure of the rolling part 2000 acts on the surface of the "recovery conductor shielding layer 20", which can be used to compact the loose particles generated by the surface of the "recovery conductor shielding layer 20" during the grinding process. The pressure applied by the rolling part 2000 to the surface of the "recovery conductor shielding layer 20" is negatively correlated with the temperature. Within a certain range, the higher the temperature, the greater the melting depth of the surface of the "recovery conductor shielding layer 20", the easier it is to compact, and the pressure is relatively small. At the same time, it is also necessary to avoid obvious deformation of the surface of the "recovery conductor shielding layer 20" under high temperature and high pressure.

[0066] The ideal melting depth of the surface of the "restored conductor shielding layer 20" is within 30 microns. After the above-mentioned trimming, if the surface roughness of the "restored conductor shielding layer 20" Ra<0.5μm, Rmax<5μm, it can be determined that the surface trimming of the "restored conductor shielding layer 20" has achieved the expected goal.

[0067] Therefore, when the surface finishing device for the flexible cable joint of the present application is used to smooth the "recovery conductor shielding layer 20" of the submarine cable flexible joint, uniform temperature and pressure can be applied to the "recovery conductor shielding layer 20" of the submarine cable flexible joint to enhance the adhesion between the semi-conductive particles produced by grinding and the "recovery conductor shielding layer 20", avoid welding marks, and improve the surface finish of the "recovery conductor shielding layer 20". After the "recovery conductor shielding layer 20" of the submarine cable flexible joint is vulcanized and roughly polished, the heating unit is used to increase the heat of the rolling part 2000 (or the soft material sleeve) to ensure that the base material at the thin layer on the surface of the "recovery conductor shielding layer 20" is melted.

[0068] When the temperature rises to the required temperature, the rolling part 2000 is clamped on the surface of the "recovery conductor shielding layer 20" so that the rolling surface of the rolling part 2000 is closely fitted with the surface of the "recovery conductor shielding layer 20", thereby ensuring that the semi-conductive grinding chips are pressed and the surface roughness is reduced while avoiding excessive pressure that causes the "recovery conductor shielding layer 20" to deform, for example, the clamping force is controlled at 0.2MPa to 3MPa. After clamping, by reciprocating the rolling part 2000 along the circumference of the "recovery conductor shielding layer 20", it is ensured that the entire surface of the "recovery conductor shielding layer 20" is subjected to uniform temperature and pressure, and that there is no parting line. When the outer surface finish of the "recovery conductor shielding layer 20" is significantly improved, the temperature is lowered, and after the temperature is lowered, a "recovery conductor shielding layer 20" with a smooth surface is obtained. The temperature control can be selected from electric heating or oil heating. The electric heating can be equipped with fan cooling, and the oil heating can be equipped with a temperature rise and fall adjustable control unit to ensure the uniformity and adjustable controllability of the temperature. Moreover, the rotation control can be set to automatic rotation or manual rotation.

[0069] This method can eliminate the defect of grinding powder generated by grinding, and a "recovery conductor shielding layer 20" with a smooth surface can be obtained based on the method of heating, melting, and pressurizing to level it. Therefore, the surface finishing device of the cable flexible joint of the present application can realize the rapid finishing of the "recovery conductor shielding layer 20" of the submarine cable flexible joint. The synergistic effect of temperature and pressure can enhance the adhesion between the semi-conductive particles generated by grinding and the "recovery conductor shielding layer 20", which can effectively reduce the migration of semi-conductive powder during the extrusion process of the insulating material, reduce the risk of mixing into the insulating layer, and effectively reduce the surface roughness under the premise of significantly reducing the molding cycle. The temperature field acts circumferentially on the outer surface of the "recovery conductor shielding layer 20", which can retain the dimensional details of the "recovery conductor shielding layer 20" and reduce the roughness caused by grinding. The design of several rolling parts 2000 of the circumferential roller type solves the problem of forming a parting line at the parting surface of the traditional mold.

[0070] The present application provides a surface finishing method, which is performed based on the surface finishing device for the flexible joint for the cable, and the surface finishing method includes: increasing the surface temperature of the target object to cause the surface of the target object to melt, applying rolling pressure to the surface of the target object, and smoothing the surface of the target object in a molten state based on the rolling pressure, controlling the rolling pressure to ensure that the semi-conductive grinding powder is compressed and the surface roughness is reduced while avoiding excessive pressure that causes deformation of the "restored conductor shielding layer 20", ensuring that the entire surface of the "restored conductor shielding layer 20" is subjected to uniform temperature and pressure, and ensuring that there is no mold line.

[0071] The above-mentioned heating and pressurizing process can be realized by the surface finishing device for the flexible joint of the cable provided in this application. Since the specific structure, functional principle and technical effect of the surface finishing device for the flexible joint of the cable have been described in detail in the previous text, they will not be repeated here. Any technical content related to the surface finishing device for the flexible joint of the cable can refer to the previous records.

[0072] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A surface finishing device for a flexible joint for a cable, characterized in that: The cable flexible joint surface finishing device comprises: A main body, wherein the main body has a storage space, and the storage space is used to accommodate a target object; A rolling portion is movably mounted on the main body, and has a rolling surface. The rolling surface of the rolling portion is used to roll in contact with the surface of the target object in the storage space, thereby applying rolling pressure to the surface of the target object.

2. The surface finishing device for a flexible cable joint according to claim 1, characterized in that: The storage space is located inside the main body, the main body defines a first direction, and the storage space passes through the opposite ends of the main body along the first direction; in the first direction of the main body, at least a portion of the space cross-section of the storage space perpendicular to the first direction has the same cross-sectional shape.

3. The surface finishing device for a flexible cable joint according to claim 2, characterized in that: The rolling part is fixedly mounted on the main body, the fixed-axis rotation axis of the rolling part is coplanar with the first direction, and at least a portion of the rolling part is placed in the receiving space, so that the rolling part can circulate different surface areas of its rolling surface into the receiving space based on its own fixed-axis rotation, thereby applying rolling pressure to the surface layer of the target object; and / or, In a first direction of the main body, all space cross sections of the storage space perpendicular to the first direction have the same cross-sectional shape, and the storage space is in the shape of a cylindrical channel.

4. The surface finishing device for a flexible cable joint according to claim 3, characterized in that: The storage space of the main body is configured as a deformable space with adjustable radial dimensions.

5. The surface finishing device for a flexible cable joint according to claim 4, characterized in that: The main body includes a first unit part and a second unit part, the first unit part has a first unit space, the first unit space has a first space opening, the second unit part has a second unit space, the second unit space has a second space opening, the first unit part and the second unit part are assembled to each other through a connecting component, the first space opening of the first unit space and the second space opening of the second unit space are arranged relative to each other, the first unit space of the first unit part and the second unit space of the second unit part together constitute the storage space of the main body, the assembly distance between the first unit part and the second unit part can be adjusted by the connecting component, thereby adjusting the radial size of the storage space.

6. The surface finishing device for a flexible cable joint according to claim 5, characterized in that: The connecting assembly comprises a connecting element and an elastic element, the first unit part and the second unit part are movably connected via the connecting element, the first unit part and the second unit part are elastically connected to each other via the elastic element, and the assembly distance between the first unit part and the second unit part can be elastically adjusted via the elastic element; and / or, At least one of the first unit part and the second unit part is provided with a gripping element.

7. The surface finishing device for a flexible cable joint according to claim 2, characterized in that: The number of the rolling parts is set to be several, and the several rolling parts are movably assembled on the main body around the storage space of the main body. The rolling surfaces of the several rolling parts are used to simultaneously roll in contact with the surface of the target object in the storage space, thereby simultaneously applying rolling pressure to the surface of the target object.

8. The surface finishing device for a flexible cable joint according to claim 7, characterized in that: At least a part of the rolling part is structured as a rotating body, the circumferential side wall of the rotating body constitutes the rolling surface of the rolling part, the central axes of several rolling parts are arranged parallel to each other, and the central axes of several rolling parts are all coplanar with the first direction of the main body.

9. The surface finishing device for a flexible cable joint according to claim 1, characterized in that: The cable flexible joint surface finishing device comprises: a soft material layer, the soft material layer being arranged on the rolling surface of the rolling portion; and / or, The heating unit is used to heat the target object so that the surface layer of the target object melts.

10. A surface finishing method, characterized in that: The surface finishing method is performed based on the surface finishing device for a flexible joint for a cable according to any one of claims 1 to 9, and the surface finishing method comprises: Raising the surface temperature of the target object, causing the surface of the target object to melt; A rolling pressure is applied to the surface layer of the target object, and the surface layer of the target object in a molten state is flattened based on the rolling pressure.

Images