Cable sheath processing equipment

Abstract

The invention discloses cable sheath processing equipment, relates to the technical field of power cable processing, and aims to solve the technical problems that when a polyethylene inner sheath and a flame-retardant polyolefin inner sheath are bonded by adopting a longitudinally-wrapped aluminum-plastic composite belt to serve as a waterproof isolation sleeve, the aluminum-plastic composite belt is composed of an aluminum base belt and a thin film attached to the surface of the aluminum base belt, and the thickness of the aluminum base belt is not larger than the thickness of the flame-retardant polyolefin inner sheath. Due to the fact that the aluminum-plastic composite belt is very thin, the process quality of the aluminum-plastic composite belt is difficult to control during longitudinal wrapping, and therefore the problems of belt breakage, corrugated edges and diameter springback often occur. The cable sheath material comprises a longitudinally-wrapped aluminum-plastic composite belt bonded flame-retardant polyethylene and a flame-retardant polyolefin inner sheath, a workbench is fixedly installed above the working bin, a curling table and a mold forming table are arranged on the workbench, a longitudinally-wrapped horn mold is arranged on the curling table, one end of an iron sheet is expanded, and the other end of the iron sheet is expanded. The other end of the die forming table is deformed into a similar tubular structure from a flat plate shape; and a wire stabilizing die and a sizing die are respectively arranged on the die forming table.

Description

Technical Field

[0001] The invention relates to the technical field of power cable processing, in particular to cable sheath processing equipment. Background Art

[0002] With the rapid development of my country's economy, power cables have evolved from simple power transmission to multifunctional and multi-purpose. That is, according to different uses, power cables have been given some new features, such as flame retardant, fire resistant, halogen-free and low-smoke. The requirements for cables in terms of water resistance were previously limited to submarine cables, ultra-high voltage cables and communication cables. With the deepening of research and understanding of insulation water absorption and water trees, people have gradually realized the importance of waterproof performance of power cables. Medium-voltage power cables are mostly laid underground. In areas with high groundwater levels or perennial rainfall, more and more users have put forward waterproof requirements for medium-voltage power cables.

[0003] However, when longitudinally wrapped aluminum-plastic composite tape is used to bond the polyethylene inner sheath and the flame-retardant polyolefin inner sheath as a waterproof isolation sleeve, the aluminum-plastic composite tape is composed of an aluminum base tape and a film coated on its surface. Since the aluminum-plastic composite tape is very thin, it is difficult to control its process quality during longitudinal wrapping, resulting in frequent tape breakage, ruffles and diameter rebound. Therefore, the market urgently needs to develop a cable sheath processing equipment to help people solve the existing problems. Summary of the invention

[0004] The object of the present invention is to provide a cable sheath processing equipment to solve the problem proposed in the above background technology that when a polyethylene inner sheath and a flame-retardant polyolefin inner sheath are bonded to a longitudinally wrapped aluminum-plastic composite tape as a waterproof isolation sleeve, the aluminum-plastic composite tape is composed of an aluminum base tape and a film coated on its surface. Since the aluminum-plastic composite tape is very thin, it is difficult to control its process quality during longitudinal wrapping, and thus the problems of tape breakage, ruffles and diameter rebound often occur.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a cable sheath processing equipment, comprising a cable sheath material and a working chamber, wherein the cable sheath material comprises a longitudinally wrapped aluminum-plastic composite tape bonded with flame-retardant polyethylene and a flame-retardant polyolefin inner sheath, a working table is fixedly installed above the working chamber, a crimping table and a molding table are respectively arranged on the working table, a longitudinally wrapped horn mold is arranged on the crimping table, the longitudinally wrapped horn mold is unfolded from one end of the iron sheet, and the other end is deformed from a flat plate to a tubular structure, a line stabilizing mold and a sizing mold are respectively arranged on the molding table, a longitudinally wrapped horn positioner is arranged at the outlet end of the longitudinally wrapped horn mold, the longitudinally wrapped horn positioner comprises a fixing frame, the outer side of the fixing frame is threadedly connected with a second adjusting bolt, four of the second adjusting bolts are arranged, a first hot air blower bracket is arranged between the longitudinally wrapped horn positioner and the line stabilizing mold, a second hot air blower bracket is arranged between the line stabilizing mold and the sizing mold, and the first hot air blower bracket and the second hot air blower bracket are both used to fix the hot air blower.

[0006] Through the above technical scheme, the aluminum-plastic composite tape is firstly deformed by the longitudinal wrapping horn die, from a flat plate to a tubular structure, and then further deformed by the stabilizing die, so that the diameter of the tubular structure is close to the design value; the sizing die makes the diameter of the shielding layer of the aluminum-plastic composite tape of the tubular structure reach the design requirements, and is continuously coated on the cable core, and passes through the extruder head die together to extrude a layer of outer sheath, and the production of the cable comprehensive sheath is completed after forced cooling and shaping. In order to improve the serious ruffle and diameter rebound problems that occur during the longitudinal wrapping of the aluminum-plastic composite tape, the corresponding forming control technology must be adopted in the longitudinal wrapping process. The longitudinal wrapping forming control technology refers to the process of longitudinally wrapping the aluminum-plastic composite tape into a tube. After the structure is formed, the film covered in the middle part of the two overlapping longitudinal edges is softened (about 70℃) and has stickiness and is firmly bonded to each other, and finally the longitudinal wrapping is completed. Thermal control means are used for control. The thermal control technology of longitudinal wrapping of aluminum-plastic composite tape utilizes the structural characteristics of the film covered on the aluminum base tape. During its deformation process, hot air or flame is used to heat the overlapping part of the two edges until the middle film softens and has stickiness, and the two longitudinal edges are bonded together. After cooling, the two overlapping longitudinal edges have been firmly bonded and fixed to form a stable tubular structure. The height and diameter rebound of the ruffles of the longitudinal wrapped aluminum-plastic composite tape after forming will be reduced.

[0007] In a preferred example, the present invention can be further configured as follows: the outlet diameter of the longitudinal horn mold = the cable core diameter + (1.8~2.3) mm, the outlet diameter of the line stabilizing mold = the cable core diameter + (1.6~1.7) mm, and the outlet diameter of the sizing mold = the cable core diameter + (1.3~1.5) mm.

[0008] Through the above technical scheme, technical workers calculate the size of the matching mold according to the actual outer diameter of the cable during production. It should be noted that when matching the mold, the uniformity of the cable core diameter should be checked in advance. If the cable core diameter uniformity is good, a smaller mold can be selected, otherwise a larger mold should be selected. If the tape breaks at the outlet of the longitudinal horn mold, it means that the outlet diameter of the longitudinal horn mold is too small. If the tape breaks at the outlet of the sizing mold, it means that the outlet diameter of the sizing mold is too small. According to the above formula, the mold of suitable caliber can be quickly selected to reduce the occurrence of tape breaks.

[0009] In a preferred example, the present invention can be further configured as follows: a wire feed mechanism is provided on the workbench, the wire feed mechanism includes a cable feeder and a strip stabilizer, and a transition table is provided on the workbench.

[0010] In a preferred example, the present invention can be further configured as follows: the cable feeder includes a first bracket, and the first bracket is rotatably connected to a first longitudinal clamping roller and a second longitudinal clamping roller.

[0011] Through the above technical solution, the first longitudinal clamping roller and the second longitudinal clamping roller are utilized to guide the cable stably.

[0012] In a preferred example, the present invention can be further configured as follows: the strip stabilizer includes a connecting frame, two connecting frames are provided, and a first transverse clamping roller and a second transverse clamping roller are rotatably connected between the two connecting frames.

[0013] Through the above technical solution, the first transverse clamping roller and the second transverse clamping roller are used to ensure that the strip enters the longitudinal wrapping horn mold smoothly.

[0014] In a preferred example, the present invention can be further configured as follows: a wire stabilizer is provided at the die inlet of the longitudinally wrapped horn die, the wire stabilizer includes a second bracket, a wheel frame is slidably connected to the inner side of the second bracket, a wire pressing wheel is rotatably connected to the lower side of the wheel frame, a first adjusting bolt is threadedly connected to the second bracket, and the bottom end of the first adjusting bolt is rotatably connected to the wheel frame.

[0015] Through the above technical solution, a line stabilizer is used to ensure that the cable and the strip can be kept on the same axis as the longitudinal wrapping horn die, so that the cable can be transmitted stably and the quality of the longitudinal wrapping is guaranteed.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. The invention firstly deforms the aluminum-plastic composite tape through a longitudinal wrapping horn die, from a flat plate to a tubular structure, and then further deforms it through a stabilizing die, so that the diameter of the tubular structure is close to the design value; the sizing die makes the diameter of the shielding layer of the aluminum-plastic composite tape of the tubular structure reach the design requirement, and continuously wraps it on the cable core, and passes through the extruder head die together to extrude a layer of outer sheath, and completes the production of the cable comprehensive sheath after forced cooling and shaping. In order to improve the serious ruffle and diameter rebound problems that occur when the aluminum-plastic composite tape is longitudinally wrapped, corresponding forming control technology must be adopted in the longitudinal wrapping process. The longitudinal wrapping forming control technology refers to the process of longitudinally wrapping the aluminum-plastic composite tape into a tubular structure. After the structure is formed, the film covered in the middle part of the two overlapping longitudinal edges is softened (about 70℃) and has stickiness and is firmly bonded to each other, and finally the longitudinal wrapping is completed. Thermal control means are used for control. The thermal control technology of longitudinal wrapping of aluminum-plastic composite tape utilizes the structural characteristics of the film covered on the aluminum base tape. During its deformation process, hot air or flame is used to heat the overlapping part of the two edges until the middle film softens and has stickiness, and the two longitudinal edges are bonded together. After cooling, the two overlapping longitudinal edges have been firmly bonded and fixed to form a stable tubular structure. The height and diameter rebound of the ruffles of the longitudinal wrapped aluminum-plastic composite tape after forming will be reduced.

[0018] 2. During production of the present invention, technical workers calculate the size of the matching mold according to the actual outer diameter of the cable. It should be noted that when matching the mold, the uniformity of the cable core diameter should be checked in advance. If the cable core diameter uniformity is good, a smaller mold can be selected, otherwise a larger mold should be selected. If the tape breaks at the outlet of the longitudinal horn mold, it means that the outlet diameter of the longitudinal horn mold is too small. If the tape breaks at the outlet of the sizing mold, it means that the outlet diameter of the sizing mold is too small. According to the above formula, the mold of suitable caliber can be quickly selected to reduce the occurrence of tape breaks. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of a cable sheath processing device of the present invention;

[0020] Figure 2 It is a top view of the longitudinally wrapped speaker mold of the present invention;

[0021] Figure 3 It is a front view of the cable feeder of the present invention;

[0022] Figure 4 A front view of a strip stabilizer of the present invention;

[0023] Figure 5 It is a front view of the wire stabilizer of the present invention;

[0024] Figure 6 It is a front view of the longitudinal speaker positioner of the present invention.

[0025] In the figure: 1. work chamber; 2. workbench; 3. cable feeder; 4. strip stabilizer; 5. transition table; 6. rewinding table; 7. wire stabilizer; 8. longitudinal wrapping horn mold; 9. longitudinal wrapping horn positioner; 10. molding table; 11. first hot air blower bracket; 12. wire stabilizing mold; 13. second hot air blower bracket; 14. sizing mold; 15. first bracket; 16. first longitudinal clamping roller; 17. second longitudinal clamping roller; 18. connecting frame; 19. first transverse clamping roller; 20. second transverse clamping roller; 21. second bracket; 22. first adjusting bolt; 23. wheel frame; 24. wire pressing wheel; 25. fixing frame; 26. second adjusting bolt. DETAILED DESCRIPTION

[0026] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0027] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0029] See also Figure 1 , Figure 2 and Figure 6The present invention provides an embodiment: a cable sheath processing device, including a cable sheath material and a work chamber 1, the cable sheath material includes a longitudinally wrapped aluminum-plastic composite tape bonded with a flame-retardant polyethylene and a flame-retardant polyolefin inner sheath, a work table 2 is fixedly installed above the work chamber 1, a retracting table 6 and a molding table 10 are respectively arranged on the work table 2, a longitudinally wrapped speaker mold 8 is arranged on the retracting table 6, the longitudinally wrapped speaker mold 8 is unfolded from one end of the iron sheet, and the other end is deformed from a flat plate to a tubular structure, and a line stabilizing mold is respectively arranged on the molding table 10 A tool 12 and a sizing die 14, a longitudinal horn positioner 9 is arranged at the outlet end of the longitudinal horn die 8, the longitudinal horn positioner 9 comprises a fixing frame 25, the outer side of the fixing frame 25 is threadedly connected with a second adjusting bolt 26, four second adjusting bolts 26 are arranged, a first hot air blower bracket 11 is arranged between the longitudinal horn positioner 9 and the line stabilizing die 12, a second hot air blower bracket 13 is arranged between the line stabilizing die 12 and the sizing die 14, the first hot air blower bracket 11 and the second hot air blower bracket 13 are both used to fix the hot air blower.

[0030] See also Figure 1 The outlet diameter of the longitudinal horn mold 8 = the cable core diameter + (1.8~2.3) mm, the outlet diameter of the line stabilizing mold 12 = the cable core diameter + (1.6~1.7) mm, and the outlet diameter of the sizing mold 14 = the cable core diameter + (1.3~1.5) mm.

[0031] See also Figure 1 A wire feed mechanism is provided on the workbench 2, and the wire feed mechanism includes a cable feeder 3 and a strip stabilizer 4. A transition platform 5 is provided on the workbench 2.

[0032] See also Figure 3 The cable feeder 3 includes a first bracket 15, and a first longitudinal clamping roller 16 and a second longitudinal clamping roller 17 are rotatably connected to the first bracket 15.

[0033] See also Figure 4 The strip stabilizer 4 includes a connecting frame 18, and two connecting frames 18 are provided. A first transverse clamping roller 19 and a second transverse clamping roller 20 are rotatably connected between the two connecting frames 18.

[0034] See also Figure 1 A wire stabilizer 7 is provided at the die inlet of the longitudinally wrapped speaker die 8.

[0035] See also Figure 4 The wire stabilizer 7 includes a second bracket 21, a wheel frame 23 is slidably connected to the inner side of the second bracket 21, a wire pressing wheel 24 is rotatably connected to the lower side of the wheel frame 23, a first adjusting bolt 22 is threadedly connected to the second bracket 21, and the bottom end of the first adjusting bolt 22 is rotatably connected to the wheel frame 23.

[0036] Working principle: In order to prevent the aluminum-plastic composite tape from breaking during longitudinal wrapping, the mold must be reasonably configured when formulating the longitudinal wrapping process to ensure that the aluminum-plastic composite tape gradually completes deformation during continuous operation and reduce the friction between the mold and the aluminum-plastic composite tape. The molds used include longitudinal wrapping horn mold, line stabilization mold and sizing mold. The aluminum-plastic composite tape is deformed through these three molds. First, the aluminum-plastic composite tape is initially deformed by the longitudinal wrapping horn mold, from a flat plate to a tubular structure; then it is further deformed by the line stabilization mold to make the diameter of the tubular structure close to the design value; the sizing mold makes the diameter of the shielding layer of the aluminum-plastic composite tape of the tubular structure meet the design requirements, and is continuously wrapped on the cable core, and passes through the extruder head mold together to extrude a layer of outer sheath, and after forced cooling and shaping, the production of the cable comprehensive sheath is completed.

[0037] Through verification, the geometric dimensions of each mold outlet are designed according to the following regulations:

[0038] The outlet diameter of the longitudinal horn mold = the diameter of the cable core + (1.8~2.3) mm; b. The outlet diameter of the stabilizing mold = the diameter of the cable core + (1.6~1.7) mm; c. The outlet diameter of the sizing mold = the diameter of the cable core + (1.3~1.5) mm.

[0039] According to the above formula, during production, technical workers calculate the size of the matching mold according to the actual outer diameter of the cable. It should be noted that when matching the mold, the uniformity of the cable core diameter should be checked in advance. If the cable core diameter is uniform, a smaller mold can be selected, otherwise a larger mold should be selected. If the break occurs at the exit of the longitudinal horn mold, it means that the exit diameter of the longitudinal horn mold is too small; if the break occurs at the exit of the sizing mold, it means that the exit diameter of the sizing mold is too small.

[0040] In order to improve the serious ruffle and diameter rebound problems that occur when the aluminum-plastic composite strip is longitudinally wrapped, corresponding forming control technology must be adopted in the longitudinal wrapping process. The longitudinal wrapping forming control technology means that after the aluminum-plastic composite strip is longitudinally wrapped and deformed into a tubular structure, the film covering the middle part of the two overlapping longitudinal edges is softened (about 70℃) to make it sticky and firmly bonded to each other, and finally the longitudinal wrapping forming is completed. We use thermal control means to control it.

[0041] The thermal control technology for longitudinal wrapping of aluminum-plastic composite tape utilizes the structural characteristics of a film coated on an aluminum base tape. During its deformation process, hot air or flame is used to heat the overlap of the two edges until the middle film softens and becomes sticky, and the two longitudinal edges are bonded together. After cooling, the two overlapping longitudinal edges have been firmly bonded and fixed to form a stable tubular structure. The main advantage of the thermal control technology for longitudinal wrapping of aluminum-plastic composite tape is that the height and diameter rebound of the ruffles after longitudinal wrapping of aluminum-plastic composite tape are small; the disadvantage is that high temperature can easily burn the cable core and operators, the production equipment is complicated to operate, and the working reliability of the heating device is required to be high.

[0042] In the production, the heating position is arranged before the aluminum-plastic composite tape enters the entrance of the stabilizing die and the entrance of the sizing die because our company uses a hot air blower for heating. When heating, aim at the gap at the overlap of the two longitudinal edges, heat and soften the film to make it sticky. At this time, the moving aluminum-plastic composite tape quickly enters the sizing die. After extrusion in the sizing die, the aluminum-plastic composite tape completes the bonding and shaping. We actually measured the shielding layer of the tubular aluminum-plastic composite tape after longitudinal packaging using heat control technology, and the measurement results are shown in the table below. It can be seen from the table that the maximum height of the ruffle of the aluminum-plastic composite tape after tubular molding is 0.32mm, and the maximum diameter rebound is 0.30mm.

[0043] The following table is a record of the height and diameter rebound of the ruffle produced by longitudinal wrapping using heat control technology:

[0044] Cable diameter / mm Height of ruffles / mm Diameter rebound / mm 9.3 0.10 0.12 16.3 0.16 0.20 18.6 0.22 0.22 28.5 0.24 0.26 37.1 0.32 0.30

[0045] Through the selection of waterproof structure, the design of processing technology, and the waterproof structure layer cannot affect the halogen-free, low-smoke, and flame-retardant performance of the product, it is finally confirmed that the waterproof structure is made of longitudinal aluminum-plastic composite tape bonded with flame-retardant polyethylene or flame-retardant polyolefin inner sheath as a waterproof isolation sleeve. When the cable is cabled, the wrapping tape must be wrapped with low-smoke halogen-free flame-retardant tape before the longitudinal aluminum-plastic composite tape. The designed and modified longitudinal aluminum-plastic composite tape auxiliary equipment and processing method are suitable for the production of product waterproof structure

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A cable sheath processing device, comprising a cable sheath material and a working chamber (1), characterized in that: The cable sheath material comprises a longitudinally wrapped aluminum-plastic composite tape bonded with flame-retardant polyethylene and a flame-retardant polyolefin inner sheath. A workbench (2) is fixedly installed above the work chamber (1). A reeling table (6) and a molding table (10) are respectively arranged on the workbench (2). A longitudinally wrapped horn mold (8) is arranged on the reeling table (6). The longitudinally wrapped horn mold (8) is unfolded from one end of the iron sheet, and the other end is deformed from a flat plate to a tubular structure. A line stabilizing mold (12) and a sizing mold (14) are respectively arranged on the molding table (10). The outlet of the longitudinally wrapped horn mold (8) is A longitudinal speaker positioner (9) is provided at the end, the longitudinal speaker positioner (9) comprises a fixing frame (25), the outer side of the fixing frame (25) is threadedly connected with a second adjusting bolt (26), four of the second adjusting bolts (26) are provided, a first hot air blower bracket (11) is provided between the longitudinal speaker positioner (9) and the line stabilizing mold (12), a second hot air blower bracket (13) is provided between the line stabilizing mold (12) and the sizing mold (14), and the first hot air blower bracket (11) and the second hot air blower bracket (13) are both used to fix the hot air blower.

2. A cable sheath processing equipment according to claim 1, characterized in that: The outlet diameter of the longitudinal horn mold (8) = the cable core diameter + (1.8-2.3) mm, the outlet diameter of the line stabilizing mold (12) = the cable core diameter + (1.6-1.7) mm, and the outlet diameter of the sizing mold (14) = the cable core diameter + (1.3-1.5) mm.

3. The cable sheath processing equipment according to claim 1, characterized in that: The workbench (2) is provided with a wire feed mechanism, the wire feed mechanism comprising a cable feeder (3) and a strip stabilizer (4), and the workbench (2) is provided with a transition platform (5).

4. A cable sheath processing equipment according to claim 3, characterized in that: The cable feeder (3) comprises a first bracket (15), to which a first longitudinal clamping roller (16) and a second longitudinal clamping roller (17) are rotatably connected respectively.

5. The cable sheath processing equipment according to claim 3, characterized in that: The strip stabilizer (4) comprises a connecting frame (18), two connecting frames (18) are provided, and a first transverse clamping roller (19) and a second transverse clamping roller (20) are rotatably connected between the two connecting frames (18).

6. The cable sheath processing equipment according to claim 1, characterized in that: The die inlet of the longitudinally wrapped horn die (8) is provided with a wire stabilizer (7).

7. A cable sheath processing device according to claim 6, characterized in that: The wire stabilizer (7) comprises a second bracket (21), the inner side of the second bracket (21) is slidably connected to a wheel frame (23), the lower side of the wheel frame (23) is rotatably connected to a wire pressing wheel (24), the second bracket (21) is threadedly connected to a first adjusting bolt (22), and the bottom end of the first adjusting bolt (22) is rotatably connected to the wheel frame (23).

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