Mining rubber cable intermediate joint

Abstract

The utility model discloses a mine rubber cable middle joint relates to electric power engineering technical field, the utility model discloses a mine cable, and the outer sleeve of mine cable is connected with the outer sheath of sealing cement between the outer sheath and mine cable, and the outer sheath is provided with waterproof tape outside, and the outer sheath inner ring is penetrated with the pouring head, and the pouring head bottom is fixed with the clip, and the outer sheath is provided with the filling layer inside. The utility model discloses through the setting of outer sheath, pouring head and filling layer, in the assembly middle joint before, the outer sheath is installed in the outside of a mine cable in advance, and it is moved to one side, avoids the installation operation of middle joint's influence, assembles the middle joint after good, and the pouring head is placed at the top of braided ground wire, then the outer sheath moved to one side is moved to the position where middle joint is located, and the outer ring of middle joint is surrounded, can be for cable middle joint long -term soaking in water, dust environment operation, provides the security guarantee.

Description

Technical Field

[0001] This utility model relates to the field of power engineering technology, specifically to a mid-joint of a mining rubber-sheathed cable. Background Technology

[0002] In complex and harsh working environments such as mines, mining cables, as key components for power transmission, often require intermediate joints to effectively connect two cable sections due to length requirements. As the core component of cable connections, the performance of the intermediate joint directly affects the safety and stability of power transmission.

[0003] Traditional mining cable joints often face numerous challenges during use: such as insufficient sealing performance, making them susceptible to intrusion of water vapor and dust in the mine, leading to a decline in insulation performance; poor structural strength, making them unable to withstand external forces such as mechanical compression and dragging in the mining environment; and poor stability of insulation materials in some joints, which are prone to aging and cracking after alternating high and low temperatures or long-term use, posing safety hazards such as leakage and short circuits. Utility Model Content

[0004] Therefore, the purpose of this utility model is to provide a mid-joint for mining rubber-sheathed cables to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mining rubber-sheathed cable intermediate joint, including a mining cable, wherein the mining cable is fitted with an outer sheath, and a sealing sealant is connected between the outer sheath and the mining cable, a waterproof tape is provided on the outside of the outer sheath, an injection head is passed through the inner ring of the outer sheath, and a clip is fixed at the bottom of the injection head, and a filling layer is provided inside the outer sheath.

[0006] By adopting the above technical solutions, the outer sheath can form an external protection for the intermediate joint, the sealant and waterproof tape work together to enhance the sealing between the outer sheath and the mining cable, the injection head provides a channel for the injection of filling material, the clamp can stabilize the position of the injection head, the filling layer can fill the gaps inside the joint, and the synergistic effect of multiple components improves the waterproof and dustproof performance and structural integrity of the joint, adapting to the complex environment of the mine.

[0007] Furthermore, the outer sheath is made of silicone rubber.

[0008] By adopting the above technical solutions, silicone rubber materials have excellent resistance to high and low temperatures, anti-aging properties, and flexibility. They can adapt to harsh conditions such as alternating high and low temperatures and mechanical extrusion in mines, effectively protecting the internal joint structure and extending the service life of the joints.

[0009] Furthermore, the filler layer is formed by curing a two-component liquid epoxy resin.

[0010] By adopting the above technical solution, the two-component liquid epoxy resin has strong fluidity, which can fully fill the gaps inside the joint. After curing, it has the characteristics of being non-toxic and environmentally friendly, waterproof, having a small coefficient of thermal expansion, good adhesion, and excellent toughness. It can be tightly bonded to mining cables and joint components, resist electrical stress and mechanical pressure, and is not easy to crack under hot and cold cycles, ensuring the long-term stable operation of the joint.

[0011] Furthermore, there are three injection heads and three clamps, and the three injection heads and clamps are equidistantly distributed.

[0012] By adopting the above technical solution, three equally spaced injection heads can evenly inject filling material into the outer sheath from different positions, thus improving the filling effect.

[0013] Furthermore, the sealant is a silicone-based sealant or a silicone rubber-based sealant.

[0014] By adopting the above technical solutions, silicone-based or silicone rubber-based putty has good sealing and flexibility, can tightly adhere to the outer sheath and the surface of the mining cable, prevent leakage of filling material, enhance the waterproof and dustproof capabilities of the joint, has good compatibility with the outer sheath material, and is not prone to cracking after long-term use.

[0015] Furthermore, the mining cable includes a core, an insulation layer, a semi-conductive layer, a copper shielding layer, and a sheath layer. Two mining cables are provided, and a bolted connecting pipe connects the two mining cables. A cold shrink sleeve is fitted outside the bolted connecting pipe, and a braided ground wire is fitted outside the cold shrink sleeve. A constant force spring is fitted outside the braided ground wire.

[0016] By adopting the above technical solutions, the bolted connecting tube achieves a reliable conductive connection between the two cable cores; the cold shrink sleeve tightly wraps the connection part after shrinking, providing insulation protection; the braided ground wire works with the copper shielding layer to achieve grounding, avoiding electromagnetic interference and leakage; the constant force spring continuously holds the braided ground wire to ensure stable grounding connection, and the multi-component collaboration ensures the safety and reliability of power transmission.

[0017] Furthermore, the clip is detached from the braided ground wire.

[0018] By adopting the above technical solution, the detachable connection makes it easy to adjust the position of the injection head according to the installation requirements, improving the installation flexibility. At the same time, it facilitates the positioning and limiting of the injection head during the installation process, simplifying the on-site operation process.

[0019] Furthermore, both the injection head and the clip are made of PVC material and are integrally injection molded. The inner hole of the injection head is formed by core pulling or drilling from a mold.

[0020] By adopting the above technical solutions, PVC materials have low cost and good processing performance, making them suitable for mass production; integrated injection molding ensures the structural integrity of the injection head and the clip, preventing loose connections; the inner hole is processed by mold core pulling or drilling to ensure smooth injection of filling material and improve injection efficiency.

[0021] Furthermore, the cold shrink sleeve includes an inner conductive layer, an insulating layer is disposed outside the inner conductive layer, a stress relief layer is disposed outside the insulating layer, and an outer conductive layer is disposed outside the stress relief layer.

[0022] By adopting the above technical solutions, the inner and outer conductive layers can balance the electric field distribution at the joint and avoid local electric field concentration; the insulation layer provides a reliable insulation barrier; the stress relief layer can alleviate the electric field distortion at the core connection point. The multi-layer structure works together to optimize the electric field environment and improve the insulation reliability of the cold shrink sleeve.

[0023] Furthermore, both the inner conductive layer and the outer conductive layer are made of semi-conductive silicone rubber, the insulating layer is made of silicone rubber, the stress relief layer is made of silicone rubber with added nonlinear resistive particles, and the inner conductive layer, the insulating layer, the stress relief layer and the outer conductive layer are vulcanized and fixed by compression molding.

[0024] By adopting the above technical solutions, the semi-conductive silicone rubber ensures that the inner and outer conductive layers are tightly bonded to the cable's semi-conductive layer and copper shielding layer, thus ensuring a uniform electric field; the silicone rubber insulation layer is resistant to aging and has excellent insulation performance; the stress relief layer with added nonlinear resistive particles can effectively absorb electric field energy and alleviate electric field concentration; the molding and vulcanization fixation ensures that the layers are tightly bonded, avoids interlayer separation, and enhances the overall mechanical strength and structural stability of the cold shrink sleeve.

[0025] In summary, the present invention has the following main advantages:

[0026] 1. This utility model, through the arrangement of an outer sheath, an injection head, and a filling layer, allows for the pre-assembly of an intermediate joint by placing the outer sheath outside a mining cable and moving it aside to avoid affecting the installation of the intermediate joint. After assembling the intermediate joint, the injection head is placed on top of the braided ground wire. Then, the outer sheath, which had been moved aside, is moved to the position of the intermediate joint, surrounding the outer ring of the intermediate joint. Next, a hole is drilled in the outer sheath corresponding to the injection head position, with the hole diameter smaller than the diameter of the injection head. The injection head is then inserted through the hole in the outer sheath. Due to the interference fit, a seal is achieved. Finally, a two-component liquid epoxy resin can be injected into the outer sheath. The two-component liquid epoxy resin has good fluidity and can fill most of the gaps at the intermediate joint. After curing, it forms a filling layer that integrates with the mining cable and the intermediate joint. It is non-toxic, environmentally friendly, has excellent waterproof properties, a low coefficient of thermal expansion, strong adhesion that is not easy to fall off, good toughness, and resistance to electrical stress and mechanical pressure. It does not crack under thermal cycling. It provides a safety guarantee for the cable intermediate joint to operate in environments such as long-term immersion in water and dust.

[0027] 2. This utility model increases the stability of the filling head by using a clip, preventing it from falling off when drilling holes in the outer sheath; it also facilitates installation and operation.

[0028] 3. This utility model uses sealing putty and waterproof tape to bind the outer sheath, preventing displacement and detachment of the outer sheath during the injection of two-component liquid epoxy resin. The waterproof tape and sealing putty work together to prevent the two-component liquid epoxy resin from flowing out and causing waste. Furthermore, the intermediate joint can also provide a certain degree of waterproof and dustproof effect during subsequent use. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of this utility model;

[0030] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0031] Figure 3 This is a schematic diagram of the cross-sectional structure of the mining cable of this utility model;

[0032] Figure 4 This is a side sectional view of the present invention.

[0033] Figure 5 This is a partial structural diagram of the cold shrink sleeve of this utility model.

[0034] In the diagram: 1. Mining cable; 2. Bolted connecting pipe; 3. Cold shrink sleeve; 301. Inner conductive layer; 302. Insulation layer; 303. Stress relief layer; 304. Outer conductive layer; 4. Braided ground wire; 5. Constant force spring; 6. Outer sheath; 7. Sealing putty; 8. Waterproof tape; 9. Injection head; 10. Clamp; 11. Filler layer. Detailed Implementation

[0035] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0036] The embodiments of this utility model will be described below based on its overall structure.

[0037] Example 1:

[0038] Mining rubber-sheathed cable intermediate joint, such as Figure 1 , Figure 2 and Figure 4As shown, the system includes a mining cable 1, with an outer sheath 6 made of silicone rubber. A sealant 7, either silicone-based or silicone rubber-based, connects the outer sheath 6 to the mining cable 1. Waterproof tape 8 is applied to the outside of the outer sheath 6, and workers wrap the outer sheath 6 with the waterproof tape 8. The waterproof tape 8 secures the outer sheath 6, preventing displacement or detachment during material injection. Furthermore, the sealant 7 and waterproof tape 8 work together to prevent subsequent material leakage and waste. This design is cost-effective and enhances the waterproof and dustproof performance of the connector during use. The inner ring of the outer sheath 6 has a filling head 9 running through it. A clip 10 is fixed to the bottom of the filling head 9. Three filling heads 9 and three clips 10 are provided, equidistantly distributed. The clips 10 are detachably connected to the braided ground wire 4. Workers attach the three filling heads 9 to the braided ground wire 4 using the clips 10. The detachable connection between the clips 10 and the braided ground wire 4 facilitates position adjustment and increases the stability of the filling head 9, preventing it from falling off during subsequent operations. This design is also applicable to the mining cable 1. External sealing putty 7 is applied; subsequently, the workers move the outer sheath 6 back outside the braided ground wire 4, so that it surrounds the entire outer ring of the connector. The outer sheath 6 is a non-cold-shrink structure to avoid excessive installation size. After moving the outer sheath 6 back, the workers drill a hole in the outer sheath 6 at the position corresponding to the injection head 9, with the hole diameter slightly smaller than the diameter of the injection head 9. Then, the injection head 9 is inserted through the hole, and an interference fit is used to achieve a seal between the injection head 9 and the outer sheath 6. The outer sheath 6 has a filling layer 11 inside, which is made of a two-component liquid epoxy resin cured by the workers. The injection head 9 injects a two-component liquid epoxy resin into the gap between the inner and outer sheaths 6 and the intermediate joint. Its excellent fluidity can fully fill most of the gaps at the joint, and after curing, it forms a filling layer 11. The filling layer 11 is integrated with the mining cable 1 and the intermediate joint. With its non-toxic and environmentally friendly properties, strong waterproofness, small coefficient of thermal expansion, good adhesion and excellent toughness, it can effectively resist electrical stress and mechanical pressure, and is not easy to crack under cold and hot cycling environment, providing a safety guarantee for the long-term stable operation of the intermediate joint in complex environments such as mine water vapor and dust.

[0039] See Figures 2-4In the above embodiment, the mining cable 1 includes a conductor, an insulating rubber layer, a semi-conductive layer, a copper shielding layer, and a sheath layer. Two mining cables 1 are provided, connected by a bolted connecting pipe 2. A cold shrink sleeve 3 is fitted over the bolted connecting pipe 2, and a braided ground wire 4 is fitted over the cold shrink sleeve 3. A constant force spring 5 is fitted over the braided ground wire 4. Workers process the ends of the two sections of mining cable 1, exposing the conductor, insulating rubber layer, semi-conductive layer, copper shielding layer, and sheath layer. Workers reliably connect the conductors of the two cable sections using the bolted connecting pipe 2 to achieve power transmission. The transmission is then completed; next, the workers move the cold shrink sleeve 3 back to the outside of the bolt connecting pipe 2 and remove the support strip inside the cold shrink sleeve 3, so that the cold shrink sleeve 3 shrinks and tightly hugs the semi-conductive layer of the mining cable 1 and the bolt connecting pipe 2; then, the workers move the braided ground wire 4 back to the outside of the cold shrink sleeve 3, and the two ends of the cold shrink sleeve 3 respectively contact the copper shielding layer of the two sections of the mining cable 1. The workers then fix the braided ground wire 4 with the constant force spring 5. The constant force spring 5 can provide continuous clamping force, so that the braided ground wire 4 is reliably connected to the copper shielding layer of the cable, etc., to achieve grounding protection and avoid electromagnetic interference and leakage risk.

[0040] Example 2:

[0041] Based on the above embodiment one, the following settings are now adopted to increase the stability of the structural connection.

[0042] See Figure 1 , Figure 2 and Figure 4 In the above embodiments, both the injection head 9 and the clip 10 are made of PVC material. PVC material has low cost and excellent processing performance, making it suitable for mass production and reducing manufacturing costs. The injection head 9 and the clip 10 are integrally injection molded. The inner hole of the injection head 9 is formed by core pulling or drilling from a mold. The integral injection molding ensures the structural integrity and connection stability of the injection head and the clip, avoiding loosening or falling off during assembly.

[0043] Example 3:

[0044] Based on the above embodiment 1, in order to improve the reliability of the cold shrink sleeve 3, the following settings are now implemented.

[0045] See Figure 5In the above embodiment, the cold shrink sleeve 3 includes an inner conductive layer 301, an insulating layer 302 disposed outside the inner conductive layer 301, a stress relief layer 303 disposed outside the insulating layer 302, and an outer conductive layer 304 disposed outside the stress relief layer 303. The inner conductive layer 301 and the outer conductive layer 304 are both made of semi-conductive silicone rubber material, the insulating layer 302 is made of silicone rubber material, and the stress relief layer 303 is made of silicone rubber material with added nonlinear resistive particles. The inner conductive layer 301, the insulating layer 302, the stress relief layer 303, and the outer conductive layer 304 are vulcanized and fixed by compression molding. Each layer is fixed into one piece by compression molding and vulcanization, resulting in a compact structure and high stability. This avoids interlayer separation, enhances the overall mechanical strength of the cold shrink sleeve, and enables it to withstand external forces such as compression and dragging in the mining environment, thus extending the service life of the joint.

[0046] The implementation principle of this utility model is as follows: First, the workers process the ends of the two mining cables 1, exposing the core, insulating rubber layer, semi-conductive layer, copper shielding layer, and sheath layer. Then, the cold shrink sleeve 3, braided ground wire 4, and outer sheath 6 are pre-installed on the outside of one of the mining cables 1, and the cold shrink sleeve 3, braided ground wire 4, and outer sheath 6 are moved to one side to avoid affecting the installation steps of the intermediate joint. Subsequently, the workers reliably connect the cores of the two cables through the bolt connecting pipe 2 to realize the conduction of power transmission.

[0047] Next, the workers moved the cold shrink sleeve 3 back to the outside of the bolted connecting tube 2 and removed the support strip inside the cold shrink sleeve 3, causing the cold shrink sleeve 3 to shrink and tightly hug the semi-conductive layer of the mining cable 1 and the bolted connecting tube 2. Then, the workers moved the braided ground wire 4 back to the outside of the cold shrink sleeve 3, with both ends of the cold shrink sleeve 3 contacting the copper shielding layers of the two sections of the mining cable 1 respectively. The workers then fixed the braided ground wire 4 with a constant force spring 5. The constant force spring 5 provides continuous clamping force, ensuring a reliable connection between the braided ground wire 4 and the copper shielding layer of the cable, achieving grounding protection and avoiding electromagnetic interference and leakage risks.

[0048] The inner conductive layer 301 and outer conductive layer 304 of the cold shrink sleeve 3 are made of semi-conductive silicone rubber material, which can fit well with the semi-conductive layer, copper shielding layer and braided ground wire 4 of the cable to ensure uniform electric field distribution; the middle insulating layer 302 is made of silicone rubber material to enhance the overall insulation performance; the stress relief layer 303 is made of silicone rubber material with added nonlinear resistive particles, which can effectively alleviate the electric field concentration phenomenon. The inner conductive layer 301, insulating layer 302, stress relief layer 303 and outer conductive layer 304 are vulcanized and fixed together by compression molding to ensure structural stability.

[0049] Afterwards, the workers installed the three injection heads 9 onto the braided ground wire 4 using clamps 10. The clamps 10 and the braided ground wire 4 are detachably connected, which facilitates position adjustment and increases the stability of the injection heads 9, preventing them from falling off during subsequent operations. Sealing putty 7 was then wrapped around the outside of the mining cable 1. Subsequently, the workers moved the outer sheath 6 back outside the braided ground wire 4, so that it surrounds the entire outer ring of the joint. The outer sheath 6 is a non-cold-shrink structure to avoid excessive installation size. After moving the outer sheath 6 back, the workers drilled holes in the outer sheath 6 at the positions corresponding to the injection heads 9. The hole diameter was slightly smaller than the diameter of the injection head 9. The injection head 9 was then inserted through the hole, and an interference fit was used to achieve a seal between the injection head 9 and the outer sheath 6.

[0050] Subsequently, the staff wrapped waterproof tape 8 around the outside of the outer sheath 6; the waterproof tape 8 can bind the outer sheath 6 tightly to prevent the outer sheath 6 from shifting or falling off when the material is poured; and the sealant 7, together with the waterproof tape 8, can not only prevent the subsequent poured material from flowing out and causing waste, but also enhance the waterproof and dustproof effect during the use of the joint.

[0051] Finally, the staff injects a two-component liquid epoxy resin into the gap between the inner and outer sheaths 6 and the intermediate joint through the injection head 9. Its excellent fluidity can fully fill most of the gaps at the joint, and after curing, it forms a filling layer 11. The filling layer 11 is integrated with the mining cable 1 and the intermediate joint. With its non-toxic and environmentally friendly properties, strong waterproofness, small coefficient of thermal expansion, good adhesion and excellent toughness, it can effectively resist electrical stress and mechanical pressure, and is not easy to crack in the cold and hot cycle environment, providing a safety guarantee for the long-term stable operation of the intermediate joint in the complex environment of mine water vapor and dust.

[0052] Although embodiments of the present invention have been shown and described, these specific embodiments are merely explanations of the present invention and are not intended to limit the invention. The specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions, and variations to the embodiments as needed without departing from the principles and spirit of the present invention, provided that such modifications, substitutions, and variations are within the scope of the claims of the present invention and are protected by patent law.

Claims

1. A mining rubber-sheathed cable intermediate joint, comprising a mining cable (1), characterized in that: The mining cable (1) is fitted with an outer sheath (6), and a sealing putty (7) is connected between the outer sheath (6) and the mining cable (1). A waterproof tape (8) is provided on the outside of the outer sheath (6). An injection head (9) passes through the inner ring of the outer sheath (6), and a clip (10) is fixed at the bottom of the injection head (9). A filling layer (11) is provided inside the outer sheath (6).

2. The intermediate joint of the mining rubber-sheathed cable according to claim 1, characterized in that: The outer sheath (6) is made of silicone rubber.

3. The intermediate joint of the mining rubber-sheathed cable according to claim 1, characterized in that: The filler layer (11) is formed by curing a two-component liquid epoxy resin.

4. The intermediate joint of the mining rubber-sheathed cable according to claim 1, characterized in that: There are three injection heads (9) and three clamps (10), and the three injection heads (9) and clamps (10) are equidistantly distributed.

5. The intermediate joint of the mining rubber-sheathed cable according to claim 1, characterized in that: The sealing putty (7) is a silicone-based putty or a silicone rubber-based putty.

6. The intermediate joint of the mining rubber-sheathed cable according to claim 1, characterized in that: The mining cable (1) includes a core, an insulating rubber layer, a semi-conductive layer, a copper shielding layer, and a sheath layer. There are two mining cables (1), and a bolted connecting pipe (2) connects the two mining cables (1). A cold shrink sleeve (3) is fitted on the outside of the bolted connecting pipe (2), and a braided ground wire (4) is fitted on the outside of the cold shrink sleeve (3). A constant force spring (5) is fitted on the outside of the braided ground wire (4).

7. The intermediate joint for mining rubber-sheathed cables according to claim 6, characterized in that: The clip (10) is detached from the braided ground wire (4).

8. The intermediate joint of the mining rubber-sheathed cable according to claim 7, characterized in that: The injection head (9) and the clip (10) are both made of PVC material and are integrally injection molded. The inner hole of the injection head (9) is formed by core pulling or drilling.

9. The intermediate joint of the mining rubber-sheathed cable according to claim 6, characterized in that: The cold shrink sleeve (3) includes an inner conductive layer (301), and an insulating layer (302) is provided outside the inner conductive layer (301), and a stress relief layer (303) is provided outside the insulating layer (302), and an outer conductive layer (304) is provided outside the stress relief layer (303).

10. The intermediate joint of the mining rubber-sheathed cable according to claim 9, characterized in that: The inner conductive layer (301) and the outer conductive layer (304) are both made of semi-conductive silicone rubber, and the insulating layer (302) is made of silicone rubber. The stress relief layer (303) is made of silicone rubber with added nonlinear resistive particles. The inner conductive layer (301), the insulating layer (302), the stress relief layer (303) and the outer conductive layer (304) are vulcanized and fixed by compression molding.

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