Photoelectric composite mobile shielding cable for connection of mining heavy mobile equipment

Abstract

The utility model provides a photoelectric composite mobile shielding cable for connection of mining heavy mobile equipment, which comprises a supporting core body, a flexible armored optical cable and a plurality of power wire cores are arranged around the supporting core body, and each power wire core comprises a central conductor. A composite isolating layer, an insulating layer, a semi-conductive layer and a metal fiber woven shielding layer are sequentially arranged outside the conductor; the flexible armored optical cable and the power wire cores are jointly coated with an isolating layer, an inner sheath, an aramid yarn braid layer and an outer sheath. The cable has excellent bending performance, excellent electrical insulation performance and flame retardant performance and extremely small transition resistance, can realize power transmission, signal transmission and monitoring functions at the same time, has excellent safety performance, and is suitable for being used in flammable and explosion-dangerous occasions.

Description

Technical Field

[0001] The utility model relates to the field of power cables, in particular to a photoelectric composite mobile shielded cable for connecting heavy mobile equipment used in mines. Background Art

[0002] Mining cables are widely used in the coal mining industry, and their market prospects are closely related to the development prospects of the coal industry.

[0003] my country has rich coal reserves, and its production and reserves rank first in the world. As the country continues to introduce policies on coal production safety, in the future, coal mine cable product manufacturing projects will be widely used in the coal mining industry as a large-scale electromechanical equipment for safety equipment in the coal mining industry. The various types of mining cables that match it will have broader market prospects and can achieve good economic benefits.

[0004] Mining cables are not only an indispensable part of industrial enterprises and construction, but also one of the main materials that drive the rapid development of our society. There are many types of them, and their application fields not only involve the power industry, but also involve industries such as construction, communications, manufacturing, etc. In recent years, my country's mining cable industry has been in a state of rapid development. Although the mining rubber sheathed cable industry is only a supporting industry, it is the second largest industry in my country after the automobile industry, accounting for 25% of the output value of my country's electrical industry, and its product market share exceeds 90%. Relevant experts pointed out that in recent years, the number of manufacturers of the same type of mining rubber sheathed cables has continued to increase. Statistics show that there are currently more than 7,000 mining rubber sheathed cable manufacturers in China, so the competition between enterprises has reached a fever pitch, and many enterprises have made great efforts in the bidding process in order to obtain more benefits. Survey data show that more than 40% of enterprises in the mining rubber sheathed cable industry have experienced unhealthy competition such as winning bids below cost and malicious price-cutting bidding by peers.

[0005] As the global market for rubber sheathed mining cables continues to mature, the development of the rubber sheathed mining cable manufacturing industry has slowed down, with relatively small growth rates, declining demand, relatively excess capacity of cable companies, low prices, fierce competition among companies, and sharp increases in raw materials. As a result, many rubber sheathed mining cable companies have found it difficult to develop, and some small and medium-sized rubber sheathed mining cable companies or non-professional rubber sheathed mining cable factories have withdrawn from the market.

[0006] my country's new energy power generation industry will be "put to good use", and many new energy power generation industry enterprises have ushered in the spring of development. Among them, mining rubber sheathed cables have achieved rapid development, which will surely inject new vitality into my country's mining rubber sheathed cable industry.

[0007] With the continuous improvement of the comprehensive mechanized coal mining production level in coal mines, comprehensive coal mining equipment is developing towards high power and high capacity, and the power supply load of the coal mining face has increased significantly. The standard coal mining machine metal shielded soft cable has poor bending performance, poor wear resistance, and poor control wire core strength. It is easy to cause the control wire core to break during use, affecting the normal production.

[0008] The development direction of intelligent technology of coal mining machines is to use preset programs and instructions to enable the system to perceive the underground environment, and transmit information to the ground control end through Internet technology, so that the staff can quickly know the specific situation underground without going deep, and design the best mining plan according to the actual situation. The fully mechanized mining face is the main link of modern coal mining production. It is the system with the most equipment, the worst environment and the most complex work in coal mining production. So far, it has been a topic of vigorous research in various countries. The intelligent comprehensive mining face control system realizes the automatic control and remote control of coal mining operations. Through the memory cutting and adjustment control of the coal mining machine, the overall coordinated control technology of the coal mining machine, support electro-hydraulic control, and transportation system, it realizes the local / centralized / remote three-level network management of the equipment. The system can automatically adjust the production capacity of the coal mining machine according to the load of the transportation system. Through wireless network coverage, it can realize reliable communication of mobile devices and coal mining machines in the working environment, and automatically track and monitor video, voice, and data network video. According to the Internet of Things technology of sensors between devices, it can realize the posture recognition of related equipment, early warning of faults, and realize coordinated, safe and normal production. The technology of the entire project has reached the international advanced level and solved the communication bottleneck of the entire working face.

[0009] The use of advanced digital control technology to achieve fully mechanized mining automation at the working face is a research hotspot in the mining industry in the 21st century, and can improve the research, design and manufacturing capabilities of my country's coal production equipment. Moreover, due to the harsh on-site environment far away from the coal mining working face, the labor intensity is reduced, the number of operators is reduced, the level of safe production is improved, and the dependence on imported equipment suppliers is reduced. By establishing a real-time industrial Ethernet and wireless coverage network on the working face, various related equipment are linked together to achieve data communication with each device. Remote control of the working face equipment is achieved in the chute control center, including: coal mining machine, bracket, scraper conveyor, transfer machine, crusher, load center, pump station. The working condition data of each equipment is collected, stored, displayed, alarmed, and remotely controlled. With the position of the coal mining machine as the coordinate, the video tracking and switching of the coal mining machine and the bracket is realized, and the visual management of the entire working face equipment is completed.

[0010] Due to the extremely complex geological conditions and environment of the fully mechanized mining face, the mining height control of the coal mining machine at different positions is not fixed, and needs to change according to the changes in the roof rock layer. Its traction speed also changes according to the load. Therefore, the coal mining machine needs to self-learn through a cycle of coal cutting by manual operation. During remote control, the coal mining machine will cut coal according to the memory data during learning. However, if the working face situation is extremely inconsistent with the learning memory data, manual intervention is required. At this time, clear video images are required as the basis for intervention control. The working conditions of the fully mechanized mining face are complex, and sensors cannot detect all the on-site conditions. Using cameras to observe the working face situation is an indispensable monitoring method. Cooperating with sensors is an important basis for the operator to be able to operate remotely, and it is an extension of the human visual range. Therefore, visualization combined with memory cutting can achieve true remote control.

[0011] At present, the insulated cores of existing mobile shielded cables in China all adopt a structure where the conductor is directly extruded and insulated, with no isolation layer in the middle, which makes the conductor easy to break when bent. The optical cable used in the optoelectronic composite cable is a non-armored structure. When bent without the protection of the armor layer, it is easy for the remaining cores to squeeze the optical cable and affect the transmission effect. The filling basically adopts a filling strip structure, and the filling strip is made of hemp rope or other materials and extruded into the coating layer. This type of filling strip structure only serves the purpose of filling and rounding, and cannot achieve the effect of resisting stretching and bending. For the sheath layer, the sheath layer adopts a single-layer rubber structure. The single-layer sheath structure has the problems of poor tensile strength and low bending effect. Utility Model Content

[0012] In view of the above problems, the utility model provides an optoelectronic composite mobile shielded cable for connecting heavy mobile equipment for mining. The cable has excellent bending performance, excellent electrical insulation performance and flame retardant performance and extremely small transition resistance. It can simultaneously realize power transmission, signal transmission and monitoring functions, has excellent safety performance, and is suitable for use in flammable and explosion-hazardous occasions.

[0013] The optoelectronic composite mobile shielded cable for connecting heavy mobile equipment for mining comprises a supporting core body, around which a flexible armored optical cable and a plurality of power cores are arranged, wherein the power core comprises a conductor located in the center, and the outside of the conductor is sequentially provided with a composite isolation layer, an insulating layer, a semi-conductive layer and a metal fiber braided shielding layer; the outside of the flexible armored optical cable and the power core are jointly coated with an isolation layer, an inner sheath, an aramid silk braided layer and an outer sheath.

[0014] Preferably, the supporting core comprises twisted ropes of aramid filaments twisted together.

[0015] Preferably, the conductor is a multi-strand tinned round copper wire bundle twisted structure, which can effectively reduce the stress concentration of the conductor and improve the bending resistance of the conductor.

[0016] Preferably, the composite isolation layer is made of polyester tape and light non-woven fabric. The inner layer of the composite isolation layer, the polyester tape, can evenly disperse the stress of the conductor when the cable is bent, thereby preventing the insulation layer from being damaged due to excessive stress.

[0017] Preferably, the insulating layer is a continuous vulcanized rubber insulating layer to maintain good electrical insulation of the insulating core.

[0018] Preferably, the semi-conductive layer is a semi-conductive rubber extrusion layer. When the insulating core is damaged, the current can be transferred to the ground core through the semi-conductive layer, causing a single-phase grounding fault and cutting off the power supply in time. This effectively avoids arc and spark phenomena and improves electrical safety.

[0019] Preferably, the metal fiber braided shielding layer is a mixed braiding type of tinned soft copper round wire and aramid wire, and the tinned soft copper round wire and aramid wire each account for 50% of the number of spindles of the braiding machine. This structure not only maintains the excellent shielding performance of the shield, but also the metal braided shielding layer can be used as a ground wire core, and the outer diameter of the cable can be effectively reduced by no longer providing a ground wire core. Moreover, the addition of aramid wire further improves the overall tensile strength and bending resistance of the cable.

[0020] Preferably, a coating layer is provided outside the flexible armored optical cable.

[0021] Preferably, the cable core twisting pitch is set to 8 times the outer diameter of the cable core.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The conductor adopts Category 5 tinned soft copper conductor, and the conductor adopts a multi-strand soft and fine tinned round copper wire bundle twisted structure, which can effectively reduce the stress concentration of the conductor and improve the bending resistance of the conductor.

[0024] 2. The composite insulation layer is made of polyester tape and light non-woven fabric. In extruded insulation, the outer layer of the composite insulation layer can be pasted to the inner layer of insulation, so that the conductor can move freely in the insulation. The inner layer of the composite insulation layer polyester tape can keep the stress of the conductor evenly dispersed when the cable is bent, avoiding excessive stress and damage to the insulation layer.

[0025] 3. A semi-conductive rubber extrusion layer is set outside the insulation. When the insulation core is damaged, the current can be transferred to the ground core through the semi-conductive layer, causing a single-phase grounding fault and cutting off the power supply in time. It effectively avoids arc and spark phenomena and improves electrical safety.

[0026] 4. A mixed metal fiber braided shielding layer is set outside the insulation shielding. The metal fiber braided shielding layer adopts a mixed braiding type of tinned soft round copper wire and aramid wire. The tinned soft round copper wire and aramid wire account for 50% of the number of spindles of the braiding machine. This structure not only maintains the excellent shielding performance of the shielding, but also further improves the overall tensile strength and bending resistance of the cable due to the addition of aramid wire.

[0027] 5. A twisted aramid rope is set in the center of the cable core as a high-strength load-bearing core, and the tensile strength of the twisted aramid rope is ≥4.5kN. It is beneficial to maintain structural stability and bending resistance when the cable is bent.

[0028] 6. Set up a flexible armored optical fiber group at the gap position of the cable core. Flexible armored optical cable is a subdivided product of optical cable. In order to further protect the optical fiber, a layer of retractable stainless steel casing is wrapped around the optical fiber to prevent rat bites, resist bending, and resist pressure. Flexible armored optical cable is a cable formed by optical fiber (optical transmission carrier) through a certain process. The basic structure of the optical cable is generally composed of optical fiber, spiral armor tube, filler and sheath. In addition, there may be waterproof layer, buffer layer, braided layer and other components as needed.

[0029] 7. A composite isolation layer is arranged outside the cable core, and the composite isolation layer is composed of a polyester tape and a light non-woven fabric tape.

[0030] 8. The outer isolation layer is composed of a high-strength vulcanized CPE rubber sheath with an inner tensile strength of not less than 14MPa and an elongation at break of not less than 300%, an aramid fiber braided reinforcement layer, and a high-strength vulcanized CPE outer sheath with a tensile strength of not less than 14MPa and an elongation at break of not less than 300%. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 It is the overall structure diagram of the utility model;

[0033] In the figure, 1. conductor, 2. composite isolation layer, 3. insulation layer, 4. semi-conductive layer, 5. metal fiber braided layer, 6. isolation layer, 7. inner sheath, 8. aramid wire braided layer, 9. aramid wire twisted rope, 10. outer sheath, 11. flexible armored optical cable, 12. optical cable covering layer. DETAILED DESCRIPTION

[0034] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] like Figure 1 As shown, the utility model discloses a photoelectric composite reinforced mobile shielded soft cable for connecting heavy mobile equipment for mining. The cable has high strength and high wear resistance, is easy to bend, can realize simultaneous transmission of power and signals, and can meet the simultaneous monitoring of power output and video signals.

[0036] The cable includes an internal power core, an aramid yarn twisted rope 9, and a flexible armored optical cable 11; the power core is composed of 1, a composite isolation layer 2, an insulating layer 3, a semi-conductive layer 4, and a metal fiber braided layer 5, and the conductor of each power core is twisted together by a Class 5 tinned soft copper conductor. The conductor of the power core is wrapped with a composite isolation layer 2, which is made of polyester tape and light non-woven fabric. The insulation layer 3 of the power core is extruded outside the composite isolation layer, and the semi-conductive rubber layer 4 and the metal fiber mixed braided layer 5 are sequentially arranged outside the insulation layer. The metal fiber braided shielding layer 5 is a mixed braiding type of tinned soft copper round wire and aramid yarn, and the tinned soft round copper wire and aramid yarn each account for 50% of the number of spindles of the braiding machine. A twisted aramid rope is set in the center of the cable core as the load-bearing core and reinforcement core. The tensile strength of the twisted aramid rope is ≥4.5kN. The flexible armored optical unit group is composed of a coating layer set outside the flexible armored optical cable. The coating layer is set to keep it not less than 80% of the diameter of the power line core, reduce the uneven force phenomenon, and extend the service life of the cable. A composite isolation layer is set outside the cable core. The composite isolation layer is composed of a polyester belt and a light non-woven fabric belt. A sheath layer is set outside the isolation layer. The sheath layer is composed of a high-strength vulcanized CPE rubber sheath with an inner layer tensile strength of not less than 14MPa and an elongation at break of not less than 300%, an aramid braided reinforcement layer, and a high-strength vulcanized CPE outer sheath with a tensile strength of not less than 14MPa and an elongation at break of not less than 300%.

[0037] The above-mentioned optoelectronic composite reinforced mobile shielded flexible cable for connecting heavy mobile equipment for mining adopts Category 5 tinned soft copper conductor and a multi-strand soft and fine tinned round copper wire bundle twisted structure, which can effectively reduce the stress concentration of the conductor and improve the bending resistance of the conductor.

[0038] The above-mentioned optoelectronic composite reinforced mobile shielded flexible cable for connecting heavy mobile equipment for mining has a composite insulation layer wrapped around the power core conductor. The composite insulation layer is made of polyester tape and light non-woven fabric. In the extruded insulation, the outer light non-woven fabric of the composite insulation layer can be adhered to the inner insulation layer, so that the conductor has a free range of movement in the insulation.

[0039] The above-mentioned optoelectronic composite reinforced mobile shielded flexible cable for connecting heavy mobile equipment for mining has a continuous vulcanized rubber insulation outside the composite isolation layer to maintain good electrical insulation of the insulation core. A semi-conductive rubber extrusion layer is provided outside the insulation. When the insulation core is damaged, the current can be transferred to the ground core through the semi-conductive layer, causing a single-phase grounding fault and cutting off the power supply in time. It effectively avoids arc and electric spark phenomena and improves electrical safety.

[0040] The above-mentioned optoelectronic composite reinforced mobile shielded flexible cable for connecting heavy mobile equipment for mining has a mixed metal fiber braided shielding layer outside the insulation shielding. The metal fiber braided shielding layer adopts a mixed braiding type of tinned soft copper round wire and aramid wire, and the tinned soft round wire and aramid wire account for 50% of the number of spindles of the braiding machine respectively. This structure not only maintains the excellent shielding performance of the shielding, but also further improves the overall tensile strength and bending resistance of the cable due to the addition of aramid wire.

[0041] The above-mentioned optoelectronic composite reinforced mobile shielded soft cable for connecting heavy mobile equipment for mining has an aramid twisted rope as a high-strength load-bearing core in the center of the cable core, and the tensile strength of the aramid twisted rope is ≥4.5kN. Setting a smaller twist pitch is conducive to maintaining structural stability and bending resistance when the cable is bent.

[0042] The above-mentioned optoelectronic composite reinforced mobile shielded soft cable for connecting heavy mobile equipment for mining has a flexible armored optical fiber group set at the gap position of the cable core. A rubber coating is set outside the flexible armored optical cable, and a coating is set outside the flexible armored optical cable to keep it not less than 80% of the diameter of the power line core, reduce the uneven force phenomenon, and extend the service life of the cable. The power line core and the flexible armored optical cable are twisted into a cable, and the cable core twisting pitch is set to 8 times the outer diameter of the cable core. Flexible armored optical cable is a subdivided product of optical cable. In order to further protect the optical fiber, a layer of retractable stainless steel casing is wrapped around the outside of the optical fiber to prevent rat bites, resist bending, and resist pressure. Flexible armored optical cable is a cable formed by optical fiber (optical transmission carrier) through a certain process. The basic structure of the optical cable is generally composed of optical fiber, spiral armor tube, filler and sheath. In addition, there may be waterproof layer, buffer layer, braided layer and other components as needed.

[0043] The above-mentioned optoelectronic composite reinforced mobile shielded flexible cable for connecting heavy mobile equipment for mining has a composite insulation layer outside the cable core, which is composed of a polyester tape and a light non-woven tape. In the extruded insulation, the outer light non-woven fabric of the composite insulation layer can be adhered to the inner insulation layer, so that the conductor has a free range of movement in the insulation.

[0044] The above-mentioned optoelectronic composite reinforced mobile shielded flexible cable for connecting heavy-duty mobile equipment for mining is composed of a high-strength vulcanized CPE rubber sheath with an inner layer tensile strength of not less than 14MPa and an elongation at break of not less than 300%, an aramid fiber braided reinforcement layer, and a high-strength vulcanized CPE outer sheath with a tensile strength of not less than 14MPa and an elongation at break of not less than 300% outside the isolation layer.

[0045] The utility model adopts a composite sheath structure, and a high-strength aramid yarn braided structure is used between the inner and outer sheaths. The reinforcement layer structure between the inner and outer sheaths can significantly improve the tensile strength and bending resistance of the sheath. At the same time, the tensile strength of the sheath currently used in the industry is 12MPa, and the elongation at break is 200. The tensile strength of the sheath designed by the utility model is 14MPa, and the elongation at break is more than 300. The improvement of the mechanical properties of the sheath can maintain the protection of the internal structure of the sheath when the cable is stretched or bent.

[0046] The above description is only the preferred implementation of the utility model, and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. Photoelectric composite mobile shielded cable for connecting heavy mobile equipment for mining, characterized in that: It comprises a supporting core body, a flexible armored optical cable and a plurality of power cores are arranged around the supporting core body, the power core comprises a conductor located in the center, and a composite isolation layer, an insulating layer, a semi-conductive layer and a metal fiber braided shielding layer are sequentially arranged on the outside of the conductor; the outside of the flexible armored optical cable and the power core are jointly covered with an isolation layer, an inner sheath, an aramid fiber braided layer and an outer sheath; The support core comprises twisted ropes of aramid filaments twisted together; The composite isolation layer is made of polyester tape and light non-woven fabric; The semiconductive layer is a semiconductive rubber extrusion layer.

2. The optoelectronic composite mobile shielded cable for connecting heavy mobile equipment for mining according to claim 1 is characterized in that: The conductor is a multi-strand tinned round copper wire bundle twisted structure.

3. The optoelectronic composite mobile shielded cable for connecting heavy mobile equipment for mining according to claim 1 is characterized in that: The insulating layer is a continuous vulcanized rubber insulating layer.

4. The optoelectronic composite mobile shielded cable for connecting heavy mobile equipment for mining according to claim 1 is characterized in that: The metal fiber braided shielding layer is a mixed braided type of tinned soft copper round wire and aramid yarn.

5. The optoelectronic composite mobile shielded cable for connecting heavy mobile equipment for mining according to claim 1 is characterized in that: A coating layer is arranged outside the flexible armored optical cable.

6. The optoelectronic composite mobile shielded cable for connecting heavy mobile equipment for mining according to claim 1 is characterized in that: The cable core twisting pitch is set to 8 times the outer diameter of the cable core.

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