Layered stranded halogen-free low voltage cable

Abstract

The application relates to the cable technical field and discloses a layer-stranded halogen-free low-voltage cable, which comprises an insulating outer skin and an electric core, the outer surface of the insulating outer skin is wrapped with an adaptive assembly, the adaptive assembly comprises insulating rubber, one end of a stranded rope is connected with a movable sheet, the other end of the insulating rubber is connected with a sealing sheet, the outer surface of the stranded rope is wrapped with a wrapping layer, the inner wall of the wrapping layer is connected to the outer surfaces of the movable sheet and the sealing sheet, a through hole is arranged in the surface of the wrapping layer, and the outer surface of the wrapping layer is wrapped with a braided cage. When the layer-stranded halogen-free low-voltage cable is laid, the operation process of bending and then stranding makes the cotton and hemp stranded rope closely wrap the insulating rubber, simultaneously breaks the plastic sealing polyurethane pouring sealant and fills the internal gap, and after solidification, not only the risk of local discharge caused by air gap is eliminated, but also the water intrusion is effectively prevented in cooperation with the sealing effect of the overflow filling glue.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cable, in particular to a layer-stranded halogen-free low-voltage cable. BACKGROUND

[0002] In the fields of power, communication and industrial control, cables often need to pass through complex paths during laying, especially in the context of turning connection, such as the right-angle corner of building pipe well, the joint of industrial robot, the bogie of rail transit, etc., which puts forward high requirements for the flexibility, bending resistance and sealing performance of the cable.

[0003] In the prior art, the cable laying and connection scheme for turning is mainly layer-stranded, spiral-stranded or armored structure, which increases the filling material or strengthens the insulation layer, uses a metal elbow to guide the cable turning in building wiring, or uses a pre-bent corner section for splicing in robot cable.

[0004] In the context of frequent bending and turning connection, the traditional layer-stranded cable is prone to cracking due to stress concentration, such as at the multiple bending positions of the building pipe well, the probability of insulation layer cracking increases significantly, resulting in a decrease in electrical performance or even short circuit failure; using a metal elbow to guide the cable turning is complex in construction process, which requires accurate measurement and installation of the elbow, and when the adaptability of the metal elbow and the cable is poor, it is easy to cause local wear of the cable, affecting the service life; the pre-bent corner section splicing scheme can meet the requirements of specific angles, but has poor universality and is difficult to cope with complex and variable turning angles, and the connection reliability at the splicing position is low, which is prone to looseness under vibration and other environments, affecting the stability of signal or power transmission. SUMMARY

[0005] The technical problem to be solved by the present application is the short bending life in the prior art, and therefore a layer-stranded halogen-free low-voltage cable is proposed.

[0006] In order to achieve the above purpose, the following technical scheme is adopted in the present application: a layer-stranded halogen-free low-voltage cable, comprising an insulation outer skin and an electric core, the outer surface of the electric core is wrapped with an adaptive assembly, the adaptive assembly comprises an insulation rubber, the outer surface of the insulation rubber is wrapped with a stranded rope, one end of the stranded rope is connected with a movable piece, the other end of the insulation rubber is connected with a sealing piece, the outer surface of the stranded rope is wrapped with a wrapping layer, the inner wall of the wrapping layer is connected to the outer surface of the movable piece and the sealing piece, a through hole is formed in the surface of the wrapping layer, the outer surface of the wrapping layer is wrapped with a braided cage, the outer surface of the braided cage is wrapped with a constraint assembly, the constraint assembly comprises an isolation layer, the isolation layer is wrapped on the surface of the braided cage, the outer surface of the isolation layer is wrapped with an insulation inner layer, and the outer surface of the insulation inner layer is wrapped with an insulation outer skin.

[0007] Preferably, the electric core and the insulating rubber are arranged inside the movable piece and the sealing piece, the electric core is located in the innermost layer of the cable, the electric core is made of conductor material and is used for the transportation of electric energy.

[0008] Preferably, the movable piece and the sealing piece are embedded inside the wrapping layer, the sealing piece and the wrapping layer are fixedly connected, and the movable piece and the wrapping layer are rotationally connected.

[0009] Preferably, the sealing piece and the movable piece are used for the connection of the wrapping layer, the twisted rope is twisted and wound on the surface of the insulating rubber, and the twisted rope is made of cotton and hemp material.

[0010] Preferably, the filling glue is arranged between the insulating rubber and the twisted rope, the filling glue is sealed by the plastic sealing paper, and the filling glue is wrapped around the surface of the insulating rubber.

[0011] Preferably, the filling glue is polyurethane pouring glue, the movable piece is rotated to twist the twisted rope, the twisted rope is extruded to the polyurethane pouring glue wrapped by the plastic sealing paper, and the plastic sealing paper is broken.

[0012] Preferably, the braided cage is interlaced to form a cylindrical cage structure, the braided cage is arranged between the wrapping layer and the isolation layer, and the braided cage is made of elastic nylon material.

[0013] Preferably, longitudinal grooves are arranged on the inner surface and the outer surface of the insulating inner layer, a restraint belt is embedded in the grooves, and a restraint buckle is connected to the top end of the restraint belt.

[0014] Preferably, the restraint belt is uniformly distributed along the axial direction of the insulating inner layer.

[0015] Preferably, a fixing screw is embedded in the inside of the restraint buckle, the fixing screw is embedded into the inside of the insulating outer skin, and the fixing screw is used for fixing the position of the restraint buckle.

[0016] Technical effects and advantages of the present application: The present application aims at the problems of cracking of the insulating layer, conductor breakage and partial discharge caused by the large structural rigidity of the traditional cable during the laying of the complex path turning. During the laying, the operation process of bending first and then twisting makes the cotton and hemp twisted rope tightly wrap the insulating rubber, simultaneously extrudes and breaks the plastic sealing polyurethane pouring glue to fill the internal gap. After curing, not only the risk of partial discharge caused by air gap is eliminated, but also the water intrusion is effectively prevented by the sealing effect of the overflow filling glue. In addition, the unique process of bending first and then twisting avoids the structural damage of the traditional pre-bent cable, improves the construction efficiency, and solves the complex path laying problem of building pipe well, industrial equipment and other scenes through the flexible connection with the traditional cable through the standardized joint, and ensures the reliable operation of the cable in the high-frequency bending environment. BRIEF DESCRIPTION OF DRAWINGS

[0017] The disclosure of the present application will be described with reference to the accompanying drawings. It should be understood that the drawings are only for illustrative purposes, and are not intended to limit the scope of protection of the present application. In the drawings, the same reference signs are used to refer to the same parts:

[0018] Figure 1 is a schematic diagram of the three-dimensional structure of the present application; Figure 2 is a schematic diagram of the side view structure of the present application; Figure 3 is a schematic diagram of the structure of the insulating inner layer and the restraint belt of the present application; Figure 4 is a schematic diagram of the cross-sectional structure of the insulating outer skin of the present application; Figure 5 is a schematic diagram of the structure of the woven cage and the wrapping layer of the present application; Figure 6 is a schematic diagram of the structure of the sealing sheet and the twisted rope of the present application; Figure 7 is a schematic diagram of the explosion structure of the present application; Figure 8 is a schematic diagram of the exploded structure of the woven cage and the twisted rope of the present application.

[0019] Legend: 11, insulating outer skin; 12, electric core; 2, restraint assembly; 21, insulating inner layer; 22, restraint belt; 23, restraint buckle; 24, fixing screw; 25, isolation layer; 3, adaptation assembly; 31, through hole; 32, insulating rubber; 33, woven cage; 34, sealing sheet; 35, movable sheet; 36, twisted rope; 37, wrapping layer. DETAILED DESCRIPTION

[0020] It is easy to understand that those skilled in the art can propose a variety of structures and implementation methods that can be replaced with each other without changing the essential spirit of the present application. Therefore, the following detailed description and the drawings are only exemplary descriptions of the technical solutions of the present application, and should not be considered as the whole or as a limitation or restriction on the technical solutions of the present application.

[0021] In complex cable laying scenarios, especially in areas such as building pipe wells, industrial equipment joints, and rail transit turning, which require frequent turning, the traditional cable is prone to cracking of the insulating layer and breaking of the conductor due to its high structural rigidity, and even causes partial discharge failure, which seriously affects the construction efficiency and system reliability. To solve the above problems, the present application provides a layer-twisted halogen-free low-voltage cable, which realizes the bending of complex paths and directly connects with traditional cables through standardized connectors at both ends. In practical applications, the construction difficulty at the turning point can be significantly reduced, and the risk of cracking caused by forced bending can be avoided, ensuring stable operation and reliable connection of the cable under complex paths.

[0022] Reference Figures 1-8As shown, the present application provides a technical solution: a layer-stranded halogen-free low-voltage cable, comprising an insulating outer skin 11 and an electric core 12, the outer surface of the electric core 12 is wrapped with an adaptive assembly 3, the adaptive assembly 3 comprises an insulating rubber 32, the outer surface of the insulating rubber 32 is wrapped with a stranded rope 36, one end of the stranded rope 36 is connected with a movable piece 35, the other end of the insulating rubber 32 is connected with a sealing piece 34, the electric core 12 and the insulating rubber 32 penetrate the inside of the movable piece 35 and the sealing piece 34, the electric core 12 is located in the innermost layer of the cable, the electric core 12 for power transmission is made of conductor material, through the design of multi-layer protection structure, the problems of easy mechanical damage of traditional cable core and easy interference of electrical performance are effectively solved, the mechanical protection performance and insulation reliability of the cable are significantly improved, and basic guarantee is provided for stable power transmission. In the laying of the cable, the cable is protected by setting the armor layer to increase the protection of the internal copper core. When protecting the electric core 12, the insulating rubber 32 is wrapped first. In order to improve the overall strength of the cable, the adaptive assembly 3 and the constraint assembly 2 are arranged on the outer surface of the electric core 12 to increase the strength of the cable.

[0023] In the laying of the cable, the cable is protected by setting the armor layer to increase the protection of the internal copper core. When protecting the electric core 12, the insulating rubber 32 is wrapped first. In order to improve the overall strength of the cable, the adaptive assembly 3 and the constraint assembly 2 are arranged on the outer surface of the electric core 12 to increase the strength of the cable, and the specific operation is as follows: the outer surface of the stranded rope 36 is wrapped with a wrapping layer 37, the inner wall of the wrapping layer 37 is connected to the outer surface of the movable piece 35 and the sealing piece 34, the movable piece 35 and the sealing piece 34 are embedded in the inside of the wrapping layer 37, the sealing piece 34 and the wrapping layer 37 are fixedly connected, the movable piece 35 and the wrapping layer 37 are rotatably connected, the sealing piece 34 and the movable piece 35 are used for connecting the wrapping layer 37, the movable piece 35 is rotatably connected with the wrapping layer 37, allowing the stranded rope 36 to rotate freely, the fixed connection of the sealing piece 34 ensures the sealing reliability, and the combination of the two realizes the unity of dynamic stranding and static sealing. The stranded rope 36 is stranded and wound on the surface of the insulating rubber 32, and the stranded rope 36 is made of a rope structure of cotton and hemp material, which is different from the fixed stranding structure of the traditional cable. The rotatable movable piece 35 cooperates with the cotton and hemp stranded rope 36 to solve the problems of cracking of the insulating layer and loose internal structure of the traditional cable due to the rigidity of the structure when bending. The stranded rope 36 can be dynamically tightened in subsequent operations, enhancing the structural stability of the cable in the curved state and improving the ability of the cable to adapt to complex laying paths.

[0024] In the initial stage of the cable continues to lay, the insulating outer skin 11 is subjected to bending operation. In the bending process, the internal structure is deformed. In the initial stage of bending, the stranded rope 36 is not wound in a spiral manner on the insulating rubber 32, and there is a length margin to adapt to the bending deformation of the cable. When the bending reaches the predetermined form, the movable piece 35 rotates, and the movable piece 35 is embedded in the inside of the wrapping layer 37, and cooperates with the wrapping layer 37 with a gap. During the laying of the cable, when it is necessary to tighten the stranded rope 36, the operator acts on the outer end protruding structure of the movable piece 35 by using a wrench or a rotating driving tool to apply a rotating torque. Since the movable piece 35 is fixedly connected with one end of the stranded rope 36, the rotation of the movable piece 35 drives the stranded rope 36 to start to spiral wrap on the surface of the insulating rubber 32. With the continuous rotation of the movable piece 35, the wrapping layer of the stranded rope 36 on the insulating rubber 32 is gradually tightened and tends to be dense. Through this winding process, the stranded rope 36 effectively wraps and reinforces the insulating rubber 32, thereby significantly enhancing the protection of the insulating rubber 32.

[0025] The wrapping layer 37 is provided with a through hole 31, and the outer surface of the wrapping layer 37 is wrapped with a woven cage 33. The woven cage 33 is interlaced to form a cylindrical cage structure, and the woven cage 33 is arranged between the wrapping layer 37 and the isolation layer 25. The woven cage 33 is made of elastic nylon material, and the outer surface of the woven cage 33 is wrapped with a constraint assembly 2. The constraint assembly 2 includes the isolation layer 25 wrapped on the surface of the woven cage 33, and the outer surface of the isolation layer 25 is wrapped with the insulating inner layer 21. The outer surface of the insulating inner layer 21 is wrapped with the insulating outer skin 11. The design of the through hole 31 and the woven cage 33 cooperates with the flow of the subsequent filling glue to solve the problem that the internal gap of the traditional cable is difficult to fill and the moisture is easy to invade, and realizes the effective filling and sealing of the internal gap. At the same time, the elastic nylon woven cage 33 and the multi-layer protection structure further improve the anti-extrusion and anti-stretching performance of the cable, and enhance the adaptability of the cable in complex environment.

[0026] The filling glue is sealed and wrapped around the surface of the insulating rubber 32 by the plastic sealing paper, and the filling glue is polyurethane pouring glue. The movable piece 35 rotates to make the twisted rope 36 twist, the twisted rope 36 extrudes the polyurethane pouring glue wrapped by the plastic sealing paper, the plastic sealing paper is broken, and when the twisted rope 36 is wound to make the plastic sealing paper broken, the internally stored polyurethane pouring glue is extruded, the extruded filling glue is further extruded under the continuous twisting of the twisted rope 36 and migrates to the outside of the twisted rope 36 through the gap between the twisted wires. Part of the overflowed filling glue flows out through the through hole 31 on the surface of the wrapping layer 37 and finally flows into the gap between the isolation layer 25 and the woven cage 33. The extruded glue effectively fills the internal gap, and after the glue is solidified, it plays a shaping and fixing role on the bent cable. The surface of the twisted rope 36 is attached with glue during the twisting process, and after solidification, the strength of the twisted rope 36 is improved. When the twisted rope 36 tightly wraps the insulating rubber 32, the strength of the overall structure is also enhanced. The problem of partial discharge and insulation performance degradation caused by the internal air gap of the traditional cable is solved, and the safety hazard caused by the air gap is eliminated. At the same time, the solidified glue not only fills the gap, but also shapes the bending form of the cable, enhances the integrity and stability of the cable structure, and prolongs the service life of the cable.

[0027] Secondly, by the way of bending first and then rotating the movable piece 35 for twisting, the twisted rope 36 can be better wrapped on the insulating rubber 32. If the order of operation is changed, the twisted rope 36 cannot be well wrapped on the insulating rubber 32, because if the shape of the insulating rubber 32 is changed after wrapping, the distribution of the twisted rope 36 will be uneven, and even part of the insulating rubber 32 cannot be wrapped by the twisted rope 36.

[0028] In order to further increase the protection of the cable, the bending of the cable is constrained by setting the constraint belt 22, the constraint buckle 23 and the fixing screw 24. The specific operation is as follows: no matter what material, there is a limit when stressed, in order to avoid the cable being excessively bent and causing damage, the constraint belt 22 is used to pull it, and when bent to the maximum limit, the constraint belt 22 can avoid being excessively bent, so as to ensure the safety of the laying of the cable. The inner surface and the outer surface of the insulating inner layer 21 are longitudinally provided with grooves, the constraint belt 22 is embedded in the grooves, the constraint belt 22 is longitudinally distributed, the top end of the constraint belt 22 is connected with the constraint buckle 23, and the constraint belt 22 is uniformly distributed along the axial direction of the insulating inner layer 21. The inside of the constraint buckle 23 is embedded with the fixing screw 24, the fixing screw 24 is embedded into the inside of the insulating outer skin 11, and the fixing screw 24 is used to fix the position of the constraint buckle 23.

[0029] When the cable is being bent, the insulating inner layer 21 is also bent, and when being bent, the layout is elongated, at this time, the restraint belt 22 is elongated, when the restraint belt 22 is elongated to a certain limit, if the staff continues to bend the cable, the pulling force caused by bending will make the restraint belt 22 tight, at this time, the restraint belt 22 will generate a traction force on the bending of the cable, the traction force can hinder the continuous bending of the cable, and the feedback brought will be that the bending difficulty becomes large, at this time, the staff can make adaptive changes through the feedback, so as to avoid damage caused by excessive bending of the cable.

[0030] Working principle: In the initial stage of cable laying, the insulating outer skin 11 is pre-bent, and the internal twisted rope 36 is adapted to deformation in a relaxed state. After bending to the target shape, the movable piece 35 rotates to drive the twisted rope 36 to spiral twist and tightly wrap the insulating rubber 32. During the twisting process, the twisted rope 36 extrudes the polyurethane potting glue layer on the surface of the insulating rubber 32, and the dense seal is broken; the glue migrates outward through the gap between the twisted ropes 36, and part of it flows into the gap between the insulating layer 25 and the braided cage 33 through the surface channel through hole 31, and the other part penetrates into the gap between the twisted layers of the twisted rope 36. Thus, the internal gap is filled, the air gap discharge risk is eliminated, and after curing, the cable bending shape is locked, and the strength of the twisted rope 36 itself and the overall structural stability are improved.

[0031] To prevent excessive bending damage, the restraint belt 22 forms a restraint mechanism through the restraint buckle 23 and the fixed screw 24. When the cable is bent, the insulating inner layer 21 deforms to pull the restraint belt 22 to stretch; when the restraint belt 22 reaches the designed limit length, it enters the tight state and generates a reverse traction resistance. The resistance significantly increases the operation force for further bending, forming a clear tactile warning signal. The operator adjusts the force direction and strength in time according to the feedback, so as to avoid structural damage of the cable caused by over-limit bending. Ensure the flexible connection and reliable operation of the cable in complex scenes such as building pipe wells and equipment joints.

[0032] The technical scope of the present application is not limited to the content in the above description, and those skilled in the art can make various modifications and modifications to the above embodiments without departing from the technical idea of the present application, and these modifications and modifications should be within the protection scope of the present application.

Claims

1. A stranded halogen-free low-voltage cable, characterized in that, The device includes an insulating outer sheath and a battery cell. The outer surface of the battery cell is wrapped with an adaptation component, which includes an insulating rubber sheet. The outer surface of the insulating rubber sheet is wrapped with a twisted rope. One end of the twisted rope is connected to a movable piece, and the other end of the insulating rubber sheet is connected to a sealing piece. The outer surface of the twisted rope is wrapped with a wrapping layer. The inner wall of the wrapping layer is connected to the outer surfaces of the movable piece and the sealing piece. The surface of the wrapping layer has through holes. The outer surface of the wrapping layer is wrapped with a woven cage. The outer surface of the woven cage is wrapped with a restraint component. The restraint component includes an isolation layer. The isolation layer is wrapped with the surface of the woven cage. The outer surface of the isolation layer is wrapped with an insulating inner layer. The outer surface of the insulating inner layer is wrapped with an insulating outer sheath.

2. The stranded halogen-free low-voltage cable according to claim 1, characterized in that: The battery core and insulating rubber penetrate the interior of the movable piece and sealing piece. The battery core is located in the innermost layer of the cable and is made of conductor material for the transmission of electrical energy.

3. The stranded halogen-free low-voltage cable according to claim 1, characterized in that: The movable piece and the sealing piece are embedded inside the wrapping layer. The sealing piece and the wrapping layer are fixedly connected, and the movable piece and the wrapping layer are rotatably connected.

4. The stranded halogen-free low-voltage cable according to claim 3, characterized in that: The sealing sheet and the movable sheet are used to connect the wrapping layer, and the twisted rope is twisted and wound around the surface of the insulating rubber sheet. The twisted rope is made of cotton and linen material.

5. The stranded halogen-free low-voltage cable according to claim 1, characterized in that: A filler adhesive is provided between the insulating rubber sheet and the stranded rope, and the filler adhesive is sealed by plastic sealing paper and wrapped around the surface of the insulating rubber sheet.

6. The stranded halogen-free low-voltage cable according to claim 5, characterized in that: The filler is polyurethane potting compound. The rotating plate causes the twisting rope to twist and compress the polyurethane potting compound wrapped in the plastic sealant, causing the plastic sealant to break.

7. The stranded halogen-free low-voltage cable according to claim 1, characterized in that: The woven cages are interwoven into a cylindrical cage structure, and the woven cages are placed between the wrapping layer and the isolation layer. The woven cages are made of elastic nylon material.

8. The stranded halogen-free low-voltage cable according to claim 1, characterized in that: The inner and outer surfaces of the insulating inner layer are longitudinally grooved, and a constraint band is embedded in the groove. The top end of the constraint band is connected to a constraint buckle.

9. The stranded halogen-free low-voltage cable according to claim 8, characterized in that: The constraint bands are uniformly distributed along the axial direction of the inner insulating layer.

10. The stranded halogen-free low-voltage cable according to claim 9, characterized in that: The constraint buckle has a fixing screw embedded inside it. The fixing screw is embedded inside the insulating outer sheath and is used to fix the position of the constraint buckle.

Images