Transition production method of catenary cross-linked cable

Abstract

The invention discloses a catenary cross-linked cable transition production method, which comprises the following steps of: butting a section of transition conductor which is made of the same material as a cable conductor to be produced on a conductor of an aluminum core cable to be produced in advance, butting the transition conductor with the cable conductor to be produced, and pulling a second joint out of an upper traction device, after the first connector enters a machine head of the extruder, equipment parameters of the extruder are reset, the position is defined as the zero point of the meter counting position of the conductor, and when the meter counting position moves to a proper position, cable suspension parameters are adjusted to prevent the cable from being scratched with the inner wall of a vulcanization pipe; and finally, the vulcanization pipe parameters are adjusted into the production process parameters of the aluminum core cable, non-stop continuous production is realized, the production efficiency is effectively improved, the waste of personnel, materials and time is reduced, and the production cost of the cable is further reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cable production, and in particular to a catenary cross-linked cable transition production method. Background Art

[0002] The production method of catenary cross-linked cables is an advanced manufacturing process, mainly used to produce high-voltage and ultra-high-voltage power cables. This production method can ensure that the cables have excellent electrical properties and mechanical strength. The conductors of existing catenary cross-linked cables are mostly copper conductors or aluminum conductors, with copper conductors being the majority. Aluminum core cables are widely used in many fields such as power systems, construction sites, and transportation facilities due to their light weight, low cost, and good electrical conductivity.

[0003] In actual production, the two types of cables share a production line. Due to the large amount of copper conductors, the production line mainly produces this type of cable. When it is necessary to produce aluminum core cables, the copper core three-layer co-extrusion cross-linking machine needs to be shut down first, and the production process needs to be readjusted to produce aluminum core cable three-layer co-extrusion. The shutdown and re-production method will inevitably increase the cost of personnel, materials, etc., and consume a lot of time. Therefore, it is necessary to optimize the existing cable switching production process. Summary of the invention

[0004] The purpose of the present invention is to propose a catenary cross-linked cable transition production method in view of the shortcomings of the prior art, effectively solve the problem of waste in the shutdown and re-production of catenary copper-aluminum cross-linked cables of the same size, effectively improve production efficiency and reduce cable production costs.

[0005] The technical solution to achieve the purpose of the present invention is:

[0006] A catenary cross-linked cable transition production method comprises the following steps:

[0007] Step S1: prepare an aluminum core conductor reel to be replaced on a pay-off device, and connect a section of transition copper conductor to the free end of the aluminum core conductor reel, and the connection between the two is defined as a second joint;

[0008] Step S2: connecting the other end of the transition copper conductor to the copper core conductor that is about to be finished, and the connection between the two is defined as the first joint;

[0009] Step S3: After the second joint exits the upper traction device, the conductor preheater is turned off, and after the first joint enters the die head of the extruder, the meter meter parameter on the control screen of the extruder is cleared, and the position is defined as the zero point of the conductor meter position;

[0010] Step S4: When the meter reaches 10m, the cable suspension parameters on the suspension controller are set to appropriate values ​​so that the copper core cable does not contact the inner lower wall of the vulcanized tube, and the conductor preheater is turned on according to the set parameters;

[0011] Step S5: When the zero point of the conductor meter position moves close to the distance suspension controller, the cable suspension parameter on the suspension controller is set to an appropriate value so that the rear aluminum core cable does not contact the upper wall of the vulcanized tube;

[0012] Step S6: Adjust the temperature of each section of the vulcanized tube to the set parameters of the aluminum core three-layer co-extrusion production process, and remove the transition copper conductor section and a section of the aluminum core conductor at the take-up point to start the machine adjustment process. The necessary test machine length completes the transition of the copper-aluminum cross-linked cable of the same size.

[0013] Furthermore, the length of the transition copper conductor is greater than the length from the head of the extruder to the suspension controller.

[0014] Furthermore, in the step S2, after the transition copper conductor is butt-jointed with the copper core conductor, the wire twister on the wire unwinding device is loosened, and the wire twister is tightened again after the first joint enters the die head of the extruder.

[0015] Furthermore, the second joint adopts a first connecting tube with a hollow structure to connect the transition copper conductor and the copper core conductor. The transition copper conductor and the copper core conductor are respectively inserted into the two ends of the first connecting tube, and the outer wall of the first connecting tube is pressed by external force to be fixedly connected.

[0016] Furthermore, the length of the first connecting tube is 3.5 to 4.5 times the diameter of the conductor, and the wall thickness is 2.5 mm.

[0017] Furthermore, the inner wall of the first connecting pipe is provided with anti-slip patterns.

[0018] Furthermore, the anti-slip pattern is an internal thread.

[0019] Furthermore, the first joint uses a second connecting tube and a third connecting tube that are rotatably connected to respectively connect the transition copper conductor and the aluminum core conductor, and the outer ends of the second connecting tube and the third connecting tube are provided with blind holes, and the wall thickness of the blind holes is 2.5 mm. The transition copper conductor and the aluminum core conductor are respectively inserted into the corresponding blind holes, and the outer walls of the blind holes are pressed tightly by external force to achieve fixed connection.

[0020] Furthermore, the end of the connecting end of the second connecting tube is arc-shaped and provided with a connecting groove, and both sides of the connecting groove extend to the outer circumferential surface of the second connecting tube. The connecting end of the third connecting tube is provided with a connecting portion with an arc-shaped end, and the connecting portion is inserted into the connecting groove and rotatably connected with the connecting groove through a connecting pin; the rotation direction of the second connecting tube and the third connecting tube is the same as the bending direction of the vulcanized tube.

[0021] Furthermore, the aluminum core conductor and the blind hole section of the third connecting tube are crimped in a two-stage manner.

[0022] Furthermore, the pressing force between the second connecting tube and the transition copper conductor is F1, and the pressing forces at the crimping points away from and close to the outer end of the third connecting tube are F2 and F3 respectively, and F2=85%-95% F1 and F2-F3=10% F1.

[0023] By adopting the above technical solution, the present invention has the following beneficial effects:

[0024] (1) The present invention changes the traditional method of stopping and reproducing copper-aluminum cross-linked cables of the same size but different conductor materials. By pre-joining a transition conductor of the same material as the conductor of the cable that is about to be finished with the conductor of the aluminum core cable to be produced, and joining the transition conductor with the conductor of the cable that is about to be finished, and adjusting the process parameters in the transition production process, continuous production without stopping is achieved, effectively improving production efficiency, reducing the waste of personnel, materials and time, and thus reducing the cable production cost.

[0025] (2) The present invention prevents the first joint of the copper-aluminum transition from being twisted off due to rotation after being pulled upward by adjusting the tightness of the thread twister at an appropriate time.

[0026] (3) The present invention adjusts the cable suspension parameters on the suspension controller at an appropriate time to ensure that the front copper core cable does not contact the lower wall of the vulcanized tube and the rear aluminum core cable does not contact the upper wall of the vulcanized tube, thereby preventing the three-layer co-extrusion from being scratched and damaged by the inner wall of the vulcanized tube, resulting in water ingress after entering the cooling tube.

[0027] (4) The present invention comprehensively considers the different materials of the aluminum core conductor and the copper core conductor. Due to the different tensile strengths of copper and aluminum, two different connection methods are selected at the two joints. A blind hole design is adopted at the second joint to ensure that the joint between the turning part and the aluminum conductor will not be twisted off due to weak tensile strength during the production process, which can not only meet the bending performance, but also ensure the water resistance after entering the cooling tube (that is, the three-layer co-extruded material of the conductor enters the water after being damaged by hitting the vulcanized tube wall, and the blind hole design prevents water from entering the other section of the conductor), thereby achieving smooth transition production.

[0028] (5) The second joint of the present invention adopts a two-stage crimping method, which fully considers that the aluminum conductor has a weaker deformation resistance and a lower strength than copper, thereby ensuring that the outer layer of the single wire is not broken by the pressure and that it does not break during the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to make the content of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments and in conjunction with the accompanying drawings, wherein:

[0030] Figure 1 is a flow chart of the method of the present invention;

[0031] Figure 2 It is a structural diagram of the second joint of the present invention;

[0032] Figure 3 It is a simplified structural diagram of the first joint of the present invention. DETAILED DESCRIPTION

[0033] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0034] (Example 1)

[0035] This embodiment takes the switching of the production of copper core conductor cables to the production of aluminum core conductor cables as an example, and describes in detail a method for transition production of catenary cross-linked cables. Figure 1 As shown, the specific steps include:

[0036] Step S1: prepare an aluminum core conductor reel to be replaced on the pay-off device, and connect a section of transition copper conductor to the free end of the aluminum core conductor reel, and the connection between the two is defined as the second joint; the length of the transition copper conductor is greater than the length from the head of the extruder to the suspension controller, and the length of the transition copper conductor in this embodiment is 40m.

[0037] The second joint uses a first connecting tube with a hollow structure to connect the transition copper conductor and the copper core conductor. The length of the first connecting tube is 4 times the conductor diameter and the wall thickness is 2.5 mm. Figure 2 As shown, after removing the outermost monofilament of the conductor, the transition copper conductor and the copper core conductor are respectively inserted into the two ends of the first connecting tube, and the outer wall of the first connecting tube is crimped using a split hydraulic pliers to achieve the fixed connection of the two sections of the conductor. In order to improve the connection strength between the first connecting tube and the conductor, the inner wall of the first connecting tube of this embodiment is provided with anti-slip textures, and the anti-slip textures are preferably internal threads for easy processing.

[0038] Step S2: The second connecting tube and the third connecting tube connected by rotation are used to connect the other end of the transition copper conductor and the aluminum core conductor respectively, wherein the outer ends of the second connecting tube and the third connecting tube are both provided with blind holes, the length of the blind holes is 90 mm, and the wall thickness is 2.5 mm. Specifically, the end of the connecting end of the second connecting tube is arc-shaped and provided with a connecting groove, and both sides of the connecting groove extend to the outer peripheral surface of the second connecting tube, and the connecting end of the third connecting tube is provided with a connecting part with an arc-shaped end, and the connecting part is inserted into the connecting groove and is rotatably connected with the connecting groove through a connecting pin.

[0039] After removing the outermost monofilaments of the transition copper conductor and the aluminum core conductor, insert them into the corresponding blind holes respectively, and use split hydraulic pliers to press the outer wall of the blind hole to form a fixed connection to form a first joint. Specifically, the blind hole section of the aluminum core conductor and the third connecting tube adopts a two-stage crimping method to ensure that the outer monofilament is not broken by the pressure and ensure that it does not break during the production process. The clamping force between the second connecting tube and the transition copper conductor is defined as F1, and the clamping forces at the crimping points away from and close to the outer end of the third connecting tube are F2 and F3 respectively, which needs to satisfy F2 = 85% to 95% F1 and F2-F3 = 10% F1.

[0040] After the transition copper conductor is butt-jointed with the copper core conductor, loosen the thread twister behind the lower seal to prevent the first joint of the copper-aluminum transition from being twisted off due to rotation after being pulled upward; at the same time, it is necessary to ensure that the rotation direction of the second connecting tube and the third connecting tube is the same as the bending direction of the vulcanized tube, so that the first joint can bend normally after entering the vulcanized tube to avoid scratching the inner wall of the vulcanized tube.

[0041] Step S3: After the second joint comes out of the upper traction device, the conductor preheater is turned off. After the first joint enters the head of the extruder, the wire twister is tightened again, and the equipment parameters of the extruder are reset to zero, defining this position as the zero point of the conductor meter position.

[0042] Step S4: When the meter reaches 10m, the cable suspension parameter on the suspension controller is set to an appropriate value so that the copper core cable does not contact the inner lower wall of the vulcanized tube, and the conductor preheater is turned on according to the set parameters. The setting parameter of the conductor preheater in this embodiment is 40°C, and the cable suspension parameter is set to +15 to prevent the three-layer co-extrusion from being scratched and damaged by the lower wall of the vulcanized tube, resulting in water ingress after entering the cooling tube.

[0043] Step S5: When the zero point of the conductor meter position moves to 10m in front of the suspension controller, the cable suspension parameter on the suspension controller is set to an appropriate value so that the rear aluminum core cable does not contact the upper wall of the vulcanization tube; the cable suspension parameter of this embodiment is set to -15 to prevent the three-layer co-extrusion from being scratched and damaged by the upper wall of the vulcanization tube, resulting in water ingress after entering the cooling tube.

[0044] Step S6: Adjust the temperature of each section of the vulcanized tube to the set parameters of the aluminum core three-layer co-extrusion production process, and remove the transition copper conductor section and a section of the aluminum core conductor at the take-up point to start the machine adjustment process. The necessary test machine length completes the transition of the copper-aluminum cross-linked cable of the same size.

[0045] The method of the present invention can effectively solve the problem of waste caused by shutdown and re-production of catenary copper-aluminum cross-linked cables of the same specification, effectively improve production efficiency, and reduce cable production costs. One-time transition production can shorten the time for specification change due to shutdown by 12 hours, and save about 80m of copper conductor and three-layer co-extruded materials of corresponding specifications. The method is suitable for a catenary cross-linked production line, with low cost, high efficiency and good effect.

[0046] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A catenary cross-linked cable transition production method, characterized in that: The following steps are involved: Step S1: prepare an aluminum core conductor reel to be replaced on a pay-off device, and connect a section of transition copper conductor to the free end of the aluminum core conductor reel, and the connection between the two is defined as a second joint; Step S2: connecting the other end of the transition copper conductor to the copper core conductor that is about to be finished, and the connection between the two is defined as the first joint; Step S3: After the second joint exits the upper traction device, the conductor preheater is turned off, and after the first joint enters the die head of the extruder, the meter meter parameter on the control screen of the extruder is cleared, and the position is defined as the zero point of the conductor meter position; Step S4: When the meter reaches 15% to 25% of the length of the vulcanization pipe, the cable draping parameters on the draping controller are set to appropriate values ​​so that the copper core cable does not contact the inner lower wall of the vulcanization pipe, and the conductor preheater is turned on according to the set parameters; Step S5: When the zero point of the conductor meter position moves close to the distance suspension controller, the cable suspension parameter on the suspension controller is set to an appropriate value so that the rear aluminum core cable does not contact the upper wall of the vulcanized tube; Step S6: Adjust the temperature of each section of the vulcanized tube to the set parameters of the aluminum core three-layer co-extrusion production process, and remove the transition copper conductor section and a section of the aluminum core conductor at the take-up point to start the machine adjustment process. The necessary test machine length completes the transition of the copper-aluminum cross-linked cable of the same size.

2. A catenary cross-linked cable transition production method according to claim 1, characterized in that: The length of the transition copper conductor is greater than the length from the head of the extruder to the suspension controller.

3. A catenary cross-linked cable transition production method according to claim 1, characterized in that: In the step S2, after the transition copper conductor is butted against the copper core conductor, the wire twister on the wire unwinding device is loosened, and the wire twister is tightened again after the first joint enters the die head of the extruder.

4. A catenary cross-linked cable transition production method according to claim 1, characterized in that: The second joint uses a first connecting tube with a hollow structure to connect the transition copper conductor and the copper core conductor. The transition copper conductor and the copper core conductor are respectively inserted into the two ends of the first connecting tube, and the outer wall of the first connecting tube is pressed by external force to be fixedly connected.

5. A catenary cross-linked cable transition production method according to claim 4, characterized in that: The length of the first connecting tube is 3.5 to 4.5 times the diameter of the conductor, and the wall thickness is 2.5 mm.

6. A method for producing a catenary cross-linked cable transition according to claim 4, characterized in that: The inner wall of the first connecting pipe is provided with anti-slip patterns.

7. A method for producing a catenary cross-linked cable transition according to claim 1, characterized in that: The first joint uses a second connecting tube and a third connecting tube that are rotatably connected to connect the transition copper conductor and the aluminum core conductor respectively. The outer ends of the second connecting tube and the third connecting tube are both provided with blind holes. The wall thickness of the blind holes is 2.5 mm. The transition copper conductor and the aluminum core conductor are respectively inserted into the corresponding blind holes, and the outer walls of the blind holes are pressed tightly by external force to achieve fixed connection.

8. A method for producing a catenary cross-linked cable transition according to claim 7, characterized in that: The end of the connecting end of the second connecting pipe is arc-shaped and is provided with a connecting groove, and both sides of the connecting groove extend to the outer circumferential surface of the second connecting pipe. The connecting end of the third connecting pipe is provided with a connecting part with an arc-shaped end, and the connecting part is inserted into the connecting groove and is rotatably connected with the connecting groove through a connecting pin; the rotation direction of the second connecting pipe and the third connecting pipe is the same as the bending direction of the vulcanized pipe.

9. A method for producing a catenary cross-linked cable transition according to claim 7, characterized in that: The aluminum core conductor and the blind hole section of the third connecting tube are crimped in a two-stage manner.

10. A method for producing a catenary cross-linked cable transition according to claim 9, characterized in that: The pressing force between the second connecting tube and the transition copper conductor is F1, and the pressing forces at the crimping points far from and close to the outer end of the third connecting tube are F2 and F3 respectively, and satisfy F2=85%-95%F1 and F2-F3=10%F1.

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