Multi-core cable convenient to bend and lay for mining machinery

Abstract

The invention discloses a mining machinery multi-core cable convenient to bend and lay, which comprises a plurality of wire core groups and an outer sheath arranged outside the plurality of wire core groups, each wire core group comprises a power wire core, a control wire core and a signal wire core, and each wire core group comprises a conductor and an insulating layer wrapping the conductor; the cable also comprises an elastic buffer unit array structure, and the elastic buffer unit array structure is arranged between the wire core group and the outer sheath. According to the invention, the bending stress is effectively absorbed and dispersed through the elastic buffer unit array structure, the bending rigidity of the cable is remarkably reduced, and the bending fatigue resistance of the cable is greatly improved; signal interference is avoided through an asymmetric clover-shaped electromagnetic isolation and counterweight structure, and the cable balance is optimized; through an anchoring structure of the tensile woven mesh and the sheath, relative displacement between the outer sheath and the internal elastic buffer unit array structure is prevented.

Description

Technical Field

[0001] This invention relates to the field of cables for mining machinery, specifically to multi-core cables for mining machinery that are easy to bend and lay. Background Technology

[0002] In the field of mining machinery, multi-core cables play a crucial role in transmitting power, control signals, and monitoring signals to equipment. Multi-core cables need to be frequently bent during laying, and their performance is directly related to the stability of power supply and signal transmission in mining equipment. Therefore, stringent requirements are placed on the cable's bending fatigue resistance, structural stability, tensile strength, and electromagnetic compatibility. Firstly, in order to meet the bending requirements, some existing multi-core cables used in mining machinery use a single elastic material layer as a buffer, but lack a targeted stress dispersion structure design. When bending, stress tends to concentrate in local areas, causing premature fatigue cracking of the core insulation layer. After long-term and frequent bending, the core will deform and break due to uneven stress, which seriously affects the service life of the cable and makes it difficult to meet the needs of continuous operation of mining machinery. Secondly, most cables use a symmetrical core layout. Although the manufacturing process is simple, the strong electromagnetic radiation of the power core can easily interfere with adjacent control and signal cores, leading to distorted control commands and disordered monitoring signals. At the same time, the symmetrical structure does not provide targeted weight distribution for the power core. During the winding and dragging process, the center of gravity of the cable is unstable, which can easily cause twisting and cable jumping. This not only reduces laying efficiency, but also exacerbates the wear and tear on the internal structure of the cable due to repeated twisting, thus shortening its service life. In addition, when the cable is subjected to tension, the sheath and the internal structure are prone to relative displacement, which can lead to problems such as sheath wrinkling, bulging or even falling off, seriously affecting the integrity and durability of the cable and making it unable to reliably adapt to the harsh working conditions of mining machinery. Therefore, it is essential to design multi-core cables for mining machinery that are easy to bend and lay. Summary of the Invention

[0003] The purpose of this invention is to provide a multi-core cable for mining machinery that is easy to bend and lay, in order to solve the problems mentioned in the background art, such as the stress concentration in local areas when bending existing multi-core cables for mining machinery, which leads to premature fatigue cracking of the insulation layer, core deformation and breakage, and short service life; to solve the problems that the symmetrical core layout of most cables easily causes electromagnetic interference, and insufficient counterweight leads to instability of the center of gravity when the cable is wound and dragged, resulting in twisting, cable jumps, low laying efficiency and aggravated internal wear; at the same time, to solve the problem that when the cable is subjected to tensile force, the sheath and internal structure are prone to relative displacement, resulting in sheath wrinkling, bulging or even detachment, which affects the integrity and durability of the cable.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a multi-core cable for mining machinery that is easy to bend and lay, comprising multiple core groups and an outer sheath disposed outside the multiple core groups. Each core group includes power cores, control cores, and signal cores, and each core group includes a conductor and an insulation layer covering the conductor. The cable also includes an elastic buffer unit array structure disposed between the core groups and the outer sheath, comprising a ring array layer composed of multiple independent enclosed chambers, and an elastic matrix enclosing and separating the independent enclosed chambers. The elastic matrix has... The resilient polymer material can quickly recover its deformation when the cable is bent, continuously providing elastic support for the independent enclosed chambers and ensuring the long-term stability of the chambers' stress absorption capacity. The independent enclosed chambers are circumferentially uniformly distributed on the annular array layer, and the chambers are separated by a rib-like structure formed by the elastic matrix. This rib-like structure can help disperse stress when the cable is bent, further optimizing bending performance. The insulation layer is made of oil-resistant and wear-resistant cross-linked polyethylene material, which can adapt to the harsh conditions of oil and friction in the mining machinery environment. At the same time, it has good adhesion to the elastic matrix, ensuring the integrity of the internal structure of the cable.

[0005] As a further technical solution of the present invention, it also includes an asymmetric clover-shaped electromagnetic isolation and counterweight structure. The asymmetric clover-shaped electromagnetic isolation and counterweight structure is located at the center of the cable and includes a clover-shaped skeleton. The clover-shaped skeleton forms one large and two small chambers. The power core is arranged in the large chamber, and the control core and signal core are arranged in the two small chambers respectively. The clover-shaped skeleton is made of a metal composite material with electromagnetic shielding performance, which can effectively block electromagnetic interference between the power core and the control core and signal core. At the same time, its asymmetric layout makes the center of gravity of the cable biased to the power core side, improving the running stability of the cable during the dragging and winding process of mining machinery.

[0006] As a further technical solution of the present invention, it also includes an anchoring structure for the tensile braided mesh and the sheath, wherein the anchoring structure for the tensile braided mesh and the sheath includes a fiber tensile braided mesh woven on the outside of the elastic buffer unit array structure. The fiber tensile braided mesh has pre-reserved gaps between its wires. These gaps are filled during the outer sheath forming process, and the inner surface of the outer sheath and the outer surface of the fiber tensile braided mesh form a convex-concave interlocking structure. This gap filling and convex-concave interlocking together constitute mechanical anchoring. The fiber tensile braided mesh is woven from polyethylene fibers, possessing good tensile strength and wear resistance. Its mechanical anchoring structure with the outer sheath ensures coordinated stress distribution between the sheath and the internal structure under complex mining conditions, preventing sheath delamination and wrinkling. Furthermore, the fiber tensile braided mesh is fixedly connected to the elastic matrix of the elastic buffer unit array structure, further enhancing the overall integrity of the cable structure.

[0007] As a further technical solution of the present invention, the independent closed chambers are in the form of regularly distributed circles.

[0008] As a further technical solution of the present invention, the elastic matrix is ​​a continuous elastic material, and the elastic matrix is ​​bonded to the outer surface of the insulation layer of the core assembly.

[0009] As a further technical solution of the present invention, when the cable is bent, the independent closed chamber on the outer side of the elastic buffer unit array structure is compressed, and the independent closed chamber on the inner side is stretched.

[0010] As a further technical solution of the present invention, the clover-shaped skeleton is asymmetrically distributed in the radial direction of the cable.

[0011] As a further technical solution of the present invention, the power core is centrally located on one side of the cable.

[0012] As a further technical solution of the present invention, the fiber tensile braided mesh is fixedly connected to the elastic matrix of the elastic buffer unit array structure.

[0013] As a further technical solution of the present invention, the mechanical anchoring between the fiber tensile braided mesh and the outer sheath is used to transmit tensile force.

[0014] Compared with existing technologies, the advantages of this flexible, multi-core cable for mining machinery are: The elastic buffer unit array structure, through the synergistic effect of independent closed chambers and elastic matrix, effectively absorbs and disperses bending stress when the cable is bent. This significantly reduces the bending stiffness of the cable and greatly improves the cable's resistance to bending fatigue. In bending laying scenarios in mining machinery, the internal core group of the cable is protected from excessive compression or stretching, thus extending the cable's service life. The asymmetric clover-shaped electromagnetic isolation and counterweight structure utilizes the asymmetric layout of the clover-shaped skeleton to achieve electromagnetic isolation between the power core, control core, and signal core, avoiding signal interference. On the other hand, it concentrates the main weight of the power core on one side, optimizing cable balance, making the cable stable during movement and winding, reducing twisting and cable jumps, and ensuring a smooth and orderly bending and laying process. The anchoring structure of the tensile braided mesh and the sheath ensures that the tensile force can be effectively transferred from the outer sheath to the tensile braided mesh through mechanical anchoring of the fiber tensile braided mesh and the outer sheath. This prevents relative displacement between the outer sheath and the internal elastic buffer unit array structure, avoids wrinkling, bulging or falling off of the outer sheath, greatly improves the overall integrity and durability of the cable, and enables the cable to reliably withstand the tensile and bending forces in mining machinery scenarios. Attached Figure Description

[0015] Figure 1 This is a schematic cross-sectional view of the overall structure of the present invention; In the diagram: 1. Elastic buffer unit array structure; 11. Independent enclosed chamber; 12. Elastic matrix; 2. Asymmetric clover-shaped electromagnetic isolation and counterweight structure; 21. Clover-shaped skeleton; 3. Anchoring structure of tensile braided mesh and sheath; 31. Fiber tensile braided mesh; 4. Core assembly; 41. Conductor; 42. Insulation layer; 43. Power core; 44. Control core; 45. Signal core; 5. Outer sheath. Detailed Implementation

[0016] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0017] Please see the appendix Figure 1 An embodiment of the present invention provides a multi-core cable for mining machinery that is easy to bend and lay, comprising multiple core groups 4 and an outer sheath 5 disposed outside the multiple core groups 4. The core groups 4 include power cores 43, control cores 44 and signal cores 45. Each core group 4 includes a conductor 41 and an insulation layer 42 covering the conductor 41. It also includes an elastic buffer unit array structure 1, which is disposed between the core groups 4 and the outer sheath 5. The elastic buffer unit array structure 1 includes a ring array layer composed of multiple independent closed chambers 11, and an elastic matrix 12 that surrounds and separates the independent closed chambers 11. The independent closed chambers 11 are regularly distributed in a circular shape. The elastic matrix 12 is a continuous elastic material, and the elastic matrix 12 is attached to the outer surface of the insulation layer 42 of the core group 4. The elastic matrix 12 is... The resilient polymer material can quickly recover its deformation when the cable is bent, continuously providing elastic support for the independent enclosed chamber 11, ensuring the long-term stability of the chamber's stress absorption capacity. The independent enclosed chambers 11 are circumferentially uniformly distributed on the annular array layer, and the chambers are separated by a rib-like structure formed by the elastic matrix 12. This rib-like structure can help disperse stress when the cable is bent, further optimizing bending performance. The insulation layer 42 is made of oil-resistant and wear-resistant cross-linked polyethylene material, which can adapt to the harsh conditions of oil and friction in the mining machinery environment. At the same time, it has good adhesion to the elastic matrix 12, ensuring the integrity of the internal structure of the cable. When the cable is bent, the independent enclosed chambers 11 on the outer side of the elastic buffer unit array structure 1 are compressed, while the independent enclosed chambers 11 on the inner side are stretched. It also includes an asymmetric clover-shaped electromagnetic isolation and counterweight structure 2, which is located at the center of the cable and includes a clover-shaped skeleton 21. The clover-shaped skeleton 21 is asymmetrically distributed in the radial direction of the cable and forms one large and two small chambers. The large chamber is equipped with power cores 43, and the two small chambers are equipped with control cores 44 and signal cores 45, respectively. The power cores 43 are concentrated on one side of the cable. The clover-shaped skeleton 21 is made of a metal composite material with electromagnetic shielding properties, which can effectively block electromagnetic interference between the power cores 43 and the control cores 44 and signal cores 45. At the same time, its asymmetric layout makes the center of gravity of the cable biased towards the power cores 43, improving the operating stability of the cable during the dragging and winding process of mining machinery. It also includes an anchoring structure 3 for the tensile braided mesh and the sheath. The anchoring structure 3 includes a tensile braided fiber mesh 31 woven on the outside of the elastic buffer unit array structure 1. Gaps are reserved between the fibers of the tensile braided fiber mesh 31. When the outer sheath 5 is formed, these gaps are filled, and the inner surface of the outer sheath 5 forms a convex-concave interlocking structure with the outer surface of the fibers of the tensile braided fiber mesh 31. The gap filling and the convex-concave interlocking together constitute a mechanical anchoring structure between the tensile braided fiber mesh 31 and the outer sheath 5. Mechanical anchoring is used to transmit tensile force. The fiber tensile braided mesh 31 is fixedly connected to the elastic matrix 12 of the elastic buffer unit array structure 1. The fiber tensile braided mesh 31 is woven from polyethylene fiber, which has good tensile strength and wear resistance. The mechanical anchoring structure with the outer sheath 5 can ensure the coordinated force bearing of the sheath and the internal structure under complex mining conditions, avoiding sheath delamination and wrinkling. Furthermore, the fixed connection between the fiber tensile braided mesh 31 and the elastic matrix 12 of the elastic buffer unit array structure 1 further enhances the overall integrity of the cable structure.

[0018] During manufacturing, the conductors 41 of the power core 43, control core 44, and signal core 45 are first processed separately, and an insulation layer 42 is wrapped around the conductors 41 using an extrusion process to complete the manufacturing of the core assembly 4. Then, a clover-shaped skeleton 21 is formed, and the prepared power core 43 is placed in the large cavity of the clover-shaped skeleton 21. The control core 44 and signal core 45 are placed in the two small cavities respectively, thus completing the initial assembly of the structure. First, a ring array layer consisting of multiple independent closed chambers 11 is formed. Then, an elastic matrix 12 is filled using an injection process, so that the elastic matrix 12 wraps and separates the independent closed chambers 11, and ensures that the elastic matrix 12 is tightly attached to the outer surface of the insulation layer 42 of the core group 4. Additionally, a tensile braided fiber mesh 31 is woven to ensure that gaps are reserved between the wires; the tensile braided fiber mesh 31 is fixedly connected to the elastic matrix 12 of the elastic buffer unit array structure 1; Finally, the core assembly 4, which includes the asymmetric clover-shaped electromagnetic isolation and counterweight structure 2, the elastic buffer unit array structure 1, and the fiber tensile braided mesh 31, is placed in the outer sheath 5 forming mold; the outer sheath 5 is formed by extrusion process, and the gaps between the wires of the fiber tensile braided mesh 31 are filled during the forming process, forming a mechanical anchoring structure in which the inner surface of the outer sheath 5 and the outer surface of the wires of the fiber tensile braided mesh 31 interlock, and finally the manufacturing of the entire cable is completed.

[0019] In summary, the elastic buffer unit array structure 1 of the present invention, through the synergistic effect of the independent closed chamber 11 and the elastic matrix 12, when the cable is bent, the independent closed chamber 11 on the outer side of the bend is compressed and the independent closed chamber 11 on the inner side is stretched, effectively absorbing and dispersing bending stress, significantly reducing the bending stiffness of the cable, greatly improving the bending fatigue resistance of the cable, so that the internal core group 4 is not excessively squeezed or stretched in the bending laying scenario of mining machinery, thus extending the service life of the cable. The asymmetric clover-shaped electromagnetic isolation and counterweight structure 2, with the asymmetric layout of the clover-shaped skeleton 21, achieves electromagnetic isolation between the power core 43, control core 44, and signal core 45 to avoid signal interference. On the other hand, it concentrates the main weight of the power core 43 on one side, optimizes the cable balance, makes the cable stable in posture during movement and winding, reduces twisting and cable jump, and ensures a smooth and orderly bending laying process. The anchoring structure 3 of the tensile braided mesh and the sheath is mechanically anchored to the outer sheath 5 through the fiber tensile braided mesh 31, ensuring that the tensile force can be effectively transferred from the outer sheath 5 to the fiber tensile braided mesh 31, preventing relative displacement between the outer sheath 5 and the internal elastic buffer unit array structure 1, avoiding wrinkling, bulging or falling off of the outer sheath 5, greatly improving the overall integrity and durability of the cable, and enabling the cable to reliably withstand the tensile and bending forces in mining machinery scenarios.

[0020] It will be apparent to those skilled in the art that the present 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 its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A multi-core cable for mining machinery that is easy to bend and lay, comprising multiple core groups (4) and an outer sheath (5) disposed outside the multiple core groups (4), wherein each core group (4) comprises a power core (43), a control core (44) and a signal core (45), and each core group (4) comprises a conductor (41) and an insulation layer (42) covering the conductor (41); characterized in that: It also includes an elastic buffer unit array structure (1), which is disposed between the core group (4) and the outer sheath (5), including a ring array layer composed of multiple independent closed chambers (11), and an elastic matrix (12) that wraps and separates the independent closed chambers (11).

2. The multi-core cable for mining machinery that is easy to bend and lay according to claim 1, characterized in that: It also includes an asymmetric clover-shaped electromagnetic isolation and counterweight structure (2), which is located at the center of the cable and includes a clover-shaped skeleton (21). The clover-shaped skeleton (21) forms a large chamber and two small chambers. The large chamber is equipped with a power core (43), and the two small chambers are equipped with a control core (44) and a signal core (45), respectively.

3. The multi-core cable for mining machinery that is easy to bend and lay according to claim 1, characterized in that: It also includes an anchoring structure (3) for the tensile braided mesh and sheath, wherein the anchoring structure (3) for the tensile braided mesh and sheath includes a fiber tensile braided mesh (31) woven on the outside of the elastic buffer unit array structure (1). The fiber tensile braided mesh (31) has a pre-reserved gap between the wires. When the outer sheath (5) is formed, it fills the gap between the wires of the fiber tensile braided mesh (31). The inner surface of the outer sheath (5) and the outer surface of the wires of the fiber tensile braided mesh (31) form a concave-convex interlocking structure. The gap filling and the concave-convex interlocking together constitute mechanical anchoring.

4. The multi-core cable for mining machinery that is easy to bend and lay according to claim 1, characterized in that: The independent enclosed chambers (11) are regularly distributed in a circular shape.

5. The multi-core cable for mining machinery that is easy to bend and lay according to claim 1, characterized in that: The elastic matrix (12) is a continuous elastic material, and the elastic matrix (12) is bonded to the outer surface of the insulation layer (42) of the core assembly (4).

6. The multi-core cable for mining machinery that is easy to bend and lay according to claim 1, characterized in that: When the cable bends, the independent closed chamber (11) on the outer side of the elastic buffer unit array structure (1) is compressed, and the independent closed chamber (11) on the inner side is stretched.

7. The multi-core cable for mining machinery that is easy to bend and lay according to claim 2, characterized in that: The clover-shaped skeleton (21) is asymmetrically distributed in the radial direction of the cable.

8. The multi-core cable for mining machinery that is easy to bend and lay according to claim 1, characterized in that: The power core (43) is centrally located on one side of the cable.

9. The multi-core cable for mining machinery that is easy to bend and lay according to claim 3, characterized in that: The fiber tensile braided mesh (31) is fixedly connected to the elastic matrix (12) of the elastic buffer unit array structure (1).

10. The multi-core cable for mining machinery that is easy to bend and lay according to claim 3, characterized in that: The mechanical anchoring between the fiber tensile braided mesh (31) and the outer sheath (5) is used to transmit tensile force.

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