34results about How to "Good fire insulation" patented technology

The invention discloses a thermosetting plastic. The thermosetting plastic is characterized by comprising the following components in parts by weight: 60-95 parts of thermosetting resin, 5-40 parts of low-shrink additive, 150-300 parts of an inorganic mineral filler, 2-4 parts of an initiator, 0.6-1 part of calcium hydroxide micro powder, 2-6 parts of zinc stearate micro powder and 30-60 parts of glass fiber. In comparison with a conventional thermosetting plastic, the thermosetting plastic can be solidified more rapidly, high strength can be maintained within a wide temperature range, and the flame-retardant effect is good.

The invention discloses a reamer. The reamer comprises a rack, wherein the rack is provided with an electromagnetic heating device and a reaming device which are arranged from front to back in sequence; the electromagnetic heating device comprises an electromagnetic heating coil; the reaming device comprises a reaming hole driven by a first power device; the rack is provided with a poking plate feeding device; the poking plate feeding device comprises a rotating shaft connected with a second power device; the rotating shaft is transversely arranged on the rack; the two ends of the rotating shaft are fixedly provided with circular poking plates; the peripheral parts of the poking plates are provided with at least three feeding fork entries for conveying metal pipes; poking plates are formed between adjacent feeding fork entries and can rotate to the positions, corresponding to the electromagnetic heating coil and a reaming head, on every two adjacent feeding fork entries respectively. The reamer has the advantages of high production efficiency, small floor area and low power consumption.

The invention relates to an elevator, and discloses an elevator capable of meeting an emergency and automatically reciprocally operating, transmitting a person at a set floor to a ground floor or a safe floor safely, and transmitting a firefighter to the set floor so as to carry out sequential life-saving work under a condition of flame outage. The elevator mainly comprises a counterweight and a carriage buffer device which are arranged at the bottom of an elevator shaft, and a special water supply joint, wherein a channel port is provided with a special fireproof elevator door and a fire screen release device; the end of a drag axle at the top of the elevator shaft is connected with a clutch, and the other end of the clutch is connected with a damping device; and a carriage in the elevator shaft is provided with an emergency water spray cooling device. According to the invention, the elevator is automatically operated under the condition of sudden outage of flame of a building, a life-saving way of a trapped person is increased, the uploading layout efficiency of a rescue worker is improved, and the elevator has the advantages of high operation automation degree and reliability, high rescue efficiency, and the like.

The invention discloses a lightweight flexible LSOH (Low Smoke Zero Halogen) fire-resistant low-voltage marine cable and a process flow thereof. The lightweight flexible LSOH fire-resistant low-voltage marine cable comprises a tin-plated flexible conductor, a ceramic silicone rubber insulating layer, an LSOH flame-retardant filling material, an LSOH wrapping tape layer, an LSOH flame-retardant isolating sleeve, a metal braid armor shielding layer and an LSOH flame-retardant protection sleeve. The cable disclosed by the invention has the advantages of heat insulation, fire insulation, waterproofness, shock resistance, low thermal weight loss, low smoke, zero halogen, flame retardance and the like. In case of a fire, a hard shell formed by the insulating layer can take good effects of flame retardance, fire resistance, fire prevention and fire insulation and effectively ensures smoothness of a line. The cable has the advantages of being flexible, small in size, light in weight and excellent in mechanical property and electrical property, meets the requirement of a complex laying environment in a ship, can effectively save a ship space and reduce a light ship weight of the ship and improves a cargo dead weight of the ship.

The invention relates to a cable fire-resistant insulation material, and particularly relates to a mica tape and a preparation method thereof. The mica tape comprises mica paper and glass fiber cloth. The glass fiber cloth is arranged on upper and lower surfaces of the mica paper. The mica paper and the glass fiber cloth on upper and lower surfaces of the mica paper are bonded together through glue materials. Each glue material comprises the active ingredients of an adhesive of organic silicon, a diluent of toluene and a curing agent. The weight ratio of the adhesive, the diluent and the curing agent is 3:20:1. The weight sum of the adhesive, the diluent and the curing agent accounts for 13 to 18% of the weight of the glue materials. The preparation method of the mica tape has the steps of glue material configuring, dip coating, compositing, drying, cooling, rewinding and slitting. The product has the advantages of easy manufacture, good fire-resistant insulation performance, strong shock-resistant performance and low processing cost.

The invention relates to a cable fire-resistant insulation material, and particularly relates to a double-faced organic silicon polyimide film dry mica paper tape which comprises mica paper and polyimide films. The polyimide films are arranged on upper and lower surfaces of the mica paper. The mica paper and the polyimide films on upper and lower surfaces are bonded together through glue materials. Each glue material consists of organic silicon resin, a modified additive, an additive, toluene and ethyl acetate. The weight ratio of the organic silicon resin, the modified additive, the additive, the toluene to the ethyl acetate is 10:0.6:0.24:18:12. The glue material content in the mica tape is 3 to 9 g / square meter. The thickness of the mica paper is 0.035 to 0.065mm. The thickness of each polyimide film is 0.03 to 0.035mm. The preparation method of the double-faced organic silicon polyimide film dry mica paper tape has the steps of glue material configuring, dip coating, compositing, drying, cooling, rewinding and slitting. The product has the advantages of easy manufacture, good fire-resistant insulation performance, strong shock-resistant performance and low processing cost.

The invention relates to a cable fire-resistant insulation material, and particularly relates to a double-faced mica tape and a preparation method thereof. The double-faced mica tape comprises mica paper, glass fiber cloth and a plastic film. The glass fiber cloth is arranged on the upper surface of the mica paper. The plastic film is arranged on the lower surface of mica paper. The mica paper, the glass fiber cloth and the plastic film are bonded together through glue materials, wherein the glass fiber cloth and the plastic film are on upper and lower surfaces of the mica paper. Each glue material comprises the active ingredients of an adhesive of organic silicon, a diluent of toluene and a curing agent. The weight ratio of the adhesive, the diluent and the curing agent is 3:20:1. The weight sum of the adhesive, the diluent and the curing agent accounts for 13 to 18% of the weight of the glue materials. The preparation method of the double-faced mica tape has the steps of glue material configuring, dip coating, compositing, drying, cooling, rewinding and slitting. The product has the advantages of easy manufacture, good fire-resistant insulation performance, strong shock-resistant performance and low processing cost.

The invention discloses fire-resistant polysiloxane composition and application thereof. The composition is prepared from the materials of 100 to 150 parts of polysiloxane base body, 40 to 90 parts of oxide, 0 to 75 parts of phosphoric acid and / or phosphate, 0 to 18 parts of zinc borate, 0 to 1 part of catalyst, 1 to 3 parts of peroxide crosslinking and 0 to 28 parts of reinforcing agent, wherein the catalyst is selected from one of rhodium-containing compound, platinum-containing compound and iridium-containing compound or a mixture of the rhodium-contained compound, the platinum-contained compound and the iridium-contained compound. According to the fire-resistant polysiloxane composition, a production technology is simplified, and energy is remarkably saved; the fire-resistant polysiloxane composition has insulation property, filling property, oxygen insulation property, fire insulation property, thermal insulation property, flame resistance, fireproof property and fire resistance, is mainly applied to new-energy electric vehicles, can remarkably reduce loss of the new-energy electric vehicles on fire, also can be used for manufacturing an insulator or a filling body or an oxygen insulation body or a fireproof body or an inner protection layer of a cable, can be used as a thermal-insulation, fireproof and heat-preservation material of aircrafts, ships, warships, high-speed rails and buildings, and has good application prospect.

Provided is a preparation method of an energy-saving composite refractory material. The method includes the steps that a, magnesium oxide and calcium oxide are mingled, clear water is used for removing impurities in magnesium oxide and calcium oxide, and magnetic separation for removing iron is performed, then a pulverizer is adopted for smashing to obtain a first mixture after drying; b, fine serpentine powder, silicon carbide and waste tail slags are blended and disposed by a ball mill in a ball-milling mode to obtain a second mixture; c, the second mixture is added with a bonding agent, and stirred and mixed with a plasticizer after being stirred evenly to obtain a third mixture; d, the third mixture is disposed by calcination and drying to complete the whole process. Refractory materials prepared by the preparation method have the advantage of great thermal shock resistance, and meanwhile, since the silicon carbide generates a silicon dioxide layer film under a high temperature in a refractory material layer, the slags are prevented from soaking into the refractory material layer, and the corrosion caused on the refractory material layer by the slags is restrained.

A high-temperature anti-explosion signal cable for new energy automobiles comprises a center conductor and a special high-temperature-resistant silicon rubber ceramic insulating layer. The center conductor is an annealed bare copper or tinned stranded conductor formed by standard cross stranding and is peripherally and closely coated with the special high-temperature-resistant silicon rubber ceramic insulating layer. The high-temperature anti-explosion signal cable has the advantages that performance requirements on high temperature resistance, super softness and the like can be met; after direct flame impact on the cable, the cable surface is turned into a ceramic shell with excellent flame-retardant, fireproof, fire insulation and fire prevention functions, and accordingly line smoothness is effectively protected, signal transmission is unaffected, signals can be transmitted quickly and accurately to enable people in automobiles to response timely, and personal safety is guaranteed.

The present invention provides a single-liquid-type fluorocarbon coating comprising the following components by weight: 40 to 55 parts of a fluorocarbon emulsion, 3 to 6 parts of a diluent, 0.3 to 0.4 part of a wetting agent, 0.2 to 0.7 part of a dispersing agent, 0.1 to 0.6 part of a defoamer, 0.4 to 0.9 part of a thickening agent, 10 to 15 parts of a filler, 15 to 20 parts of a pigment, 20 to 25 parts of water, 1 to 3 parts of nano magnesium oxide and 2 to 4 parts of nano-zinc hydroxide. The present invention also provides a preparation method of the single-liquid-type fluorocarbon coating. The single-liquid-type fluorocarbon coating has good acid and alkali resistance and hardness.

The invention relates to the field of ignition of heat supply devices using pulverized coal as combustion medium, in particular to a pulverized coal furnace natural gas igniter which can be ignited remotely. The pulverized coal furnace natural gas igniter comprises a hand-held protecting tube, a front fixing end, a fuel gas conveying unit, a direct-current pulse circuit unit and a rear fixing end. A threaded gas inlet hole is formed in the hand-held protecting tube. An air hole is formed in the front fixing end. Multi-stage insulating ceramic tubes for fixing and insulating are disposed outside each power supply wiring terminal from an igniting end to the end connected with wiring nuts. The front fixing end is slidably connected with both the first-stage insulating ceramic tube and the hand-held protecting tube. The rear fixing end is connected with the last-stage insulating ceramic tube in a threaded manner through tightening screws. The hand-held protecting tube is connected with the rear fixing end in a threaded manner. The pulverized coal furnace natural gas igniter has the advantages that the pulverized coal furnace natural gas igniter is high in capability of continuous combustion and capable of remote and long-term ignition, application cost is lowered, no pollutant gases are generated after fuel is combusted, and environments are protected.

The invention provides an efficient energy-saving refractory material and a preparation method thereof. The efficient energy-saving refractory material is prepared from the following components: magnesium oxide, calcium oxide, modified zirconia fiber, high silicon gangue, high aluminum red mud, a binder and a plasticizer. The refractory material prepared by the method has good mechanical strengthand excellent fire resistance, and has a simple preparation method and is easy to produce on the existing equipment in large scale.

The invention discloses a fireproof paper for painting and belongs to the technical field of fireproof papers. The fireproof paper for painting comprises, by weight, 9-14 parts of ceramic fibers, 3-7 parts of a binder and 110-140 parts of water by mixing. A preparation method of the fireproof paper comprises crushing and beating, slag removal, defibering dispersion, paper making and drying molding. The fireproof paper for painting has good applicability in molding, has a white color, a pliable and tough texture, good flatness and good fireproof and heat insulation characteristics and can be prepared by simple processes.

The invention discloses a thermosetting plastic. The thermosetting plastic is characterized by comprising the following components in parts by weight: 60-95 parts of thermosetting resin, 5-40 parts of low-shrink additive, 150-300 parts of an inorganic mineral filler, 2-4 parts of an initiator, 0.6-1 part of calcium hydroxide micro powder, 2-6 parts of zinc stearate micro powder and 30-60 parts of glass fiber. In comparison with a conventional thermosetting plastic, the thermosetting plastic can be solidified more rapidly, high strength can be maintained within a wide temperature range, and the flame-retardant effect is good.

The invention discloses a fire extinguishing agent with the functions of thermal insulation, static prevention, thunder prevention and explosion prevention. The fire extinguishing agent is characterized by comprising the following components by mass percent: 48-58% of an organic phosphate nucleating agent, 0.8-10% of PP (polypropylene) wax, 0.3-0.8% of octabromo-diphenyl ether, 0.2-0.6% of antimonous oxide, 0.2-0.6% of calcium aluminate, 0.2-0.6% of aluminum potassium sulfate dodecahydrate, 1.4-2.0% of magnesium hydrate, 0.5-0.9% of aluminium hydroxide, and the balance of water. All the components are uniformly mixed in proportion to prepare a phosphorization solution which has the characteristic of the capability of forming a film after being in contact with an object, can form liquid state phosphating film after being in contact with an object at the normal temperature, and can form a gas state phosphating film after being in contact with air at a high temperature; the two films can be used for achieving the functions of thermal insulation, fire prevention, fire extinction, static prevention, thunder prevention and explosion prevention. The fire extinguishing agent can generate the liquid state phosphating film and the gas state phosphating film, and obstructs oxygen and thermal energy in air through the two films, so that inflammable goods can be controlled, fire spread can be stopped, harmful gas can be absorbed, the functions of static prevention and insulation can be further achieved, and the benefits of thermal insulation, static prevention, thunder prevention and explosion prevention can be achieved.

The invention discloses anti-deformation building glass. The anti-deformation building glass comprises a glass body and a coating layer, the coating layer wraps the top and bottom of the glass body ina composite mode, the glass body is bonded to the coating layer through a sealing adhesive layer, and a drying agent is arranged in the glass body. The anti-deformation building glass is characterized in that a drying layer is arranged in the middle portion of the glass body, and the drying agent is placed in the drying layer; the glass body is divided into left and right parts which are symmetrical and same by the drying layer as the boundary; the glass body is mainly composed of outer layer glass, inner layer glass and a fire protection layer, and the fire protection layer is placed betweenthe outer layer glass and the inner layer glass; and protrusions and bosses are arranged on the outer surface of the side, close to the drying layer, of the inner layer glass, the protrusions and thebosses are both in clearance fit with the drying layer, and cavities are formed among the protrusions, the bosses and the drying layer. The anti-deformation building glass has the beneficial effectsthat the anti-deformation building glass has good tightness to avoid pollution caused by air leakage, a good visual effect is maintained, and fire protection and heat insulation functions are achieved.

The invention relates to a fireproof, power-saving and durable wire cable and a manufacturing method thereof. As the fireproof and flame-retardant performances of an existing cable are relatively weak, the wire cable is very easy to burn down to cause short circuit if being burnt continuously. The fireproof, power-saving and durable wire cable comprises multiple conductive line cores, and is characterized in that a fireproof layer is arranged outside the conductive line cores, an insulating shielding layer is arranged outside the fireproof layer, and a filling material is filled with gaps among the conductive line cores; a semi-conductive water-blocking tape, an inner liner layer, a copper wire and copper strip combined shielding layer, a semi-conductive water-blocking buffer strip, an aluminum-plastic composite strip and an outer sheath are arranged outside the insulating shielding layer in sequence. The fireproof, power-saving and durable wire cable is nontoxic, environment-friendly, overlong in service life, and high in safety.

The invention relates to the field of ignition of heat supply devices using pulverized coal as combustion medium, in particular to a pulverized coal furnace natural gas igniter which can be ignited remotely. The pulverized coal furnace natural gas igniter comprises a hand-held protecting tube, a front fixing end, a fuel gas conveying unit, a direct-current pulse circuit unit and a rear fixing end. A threaded gas inlet hole is formed in the hand-held protecting tube. An air hole is formed in the front fixing end. Multi-stage insulating ceramic tubes for fixing and insulating are disposed outside each power supply wiring terminal from an igniting end to the end connected with wiring nuts. The front fixing end is slidably connected with both the first-stage insulating ceramic tube and the hand-held protecting tube. The rear fixing end is connected with the last-stage insulating ceramic tube in a threaded manner through tightening screws. The hand-held protecting tube is connected with the rear fixing end in a threaded manner. The pulverized coal furnace natural gas igniter has the advantages that the pulverized coal furnace natural gas igniter is high in capability of continuous combustion and capable of remote and long-term ignition, application cost is lowered, no pollutant gases are generated after fuel is combusted, and environments are protected.

The invention relates to an elevator, and discloses an elevator capable of meeting an emergency and automatically reciprocally operating, transmitting a person at a set floor to a ground floor or a safe floor safely, and transmitting a firefighter to the set floor so as to carry out sequential life-saving work under a condition of flame outage. The elevator mainly comprises a counterweight and a carriage buffer device which are arranged at the bottom of an elevator shaft, and a special water supply joint, wherein a channel port is provided with a special fireproof elevator door and a fire screen release device; the end of a drag axle at the top of the elevator shaft is connected with a clutch, and the other end of the clutch is connected with a damping device; and a carriage in the elevator shaft is provided with an emergency water spray cooling device. According to the invention, the elevator is automatically operated under the condition of sudden outage of flame of a building, a life-saving way of a trapped person is increased, the uploading layout efficiency of a rescue worker is improved, and the elevator has the advantages of high operation automation degree and reliability, high rescue efficiency, and the like.

The invention relates to a ceramic fireproof flexible cable. The ceramic fireproof flexible cable comprises conductors, wherein an insulating layer is arranged outside each conductor, a ceramic fireproof protecting layer is arranged outside each insulating layer, a filling layer is arranged outside the ceramic fireproof protecting layers, a heat insulation lining is arranged outside the filling layer, and a metal sheath layer is arranged outside the heat insulation lining. The ceramic fireproof flexible cable is good in fireproof effect, flexible, good in insulating effect, free of moisture absorption and convenient and easy to construct and install, and continuous mechanical production can be achieved.

The invention discloses a long high-reliability flexible fireproof cable which comprises a cable core. A plurality of fireproof insulated wire cores are stranded to form the cable core. Each fireproof insulated wire core comprises a conductor and a ceramic silicon rubber fireproof insulated layer extruded or lapped on the conductor, an insulated layer is coated on each ceramic silicon rubber fireproof insulated layer, an alkali-free glass tape layer and an extruded low-smoke halogen-free outer sheath are sequentially coated on the periphery of the cable core from inside to outside, and fillers are filled in the space between the cable core and the alkali-free glass tape layer. A fine fireproof insulated effect is achieved by the aid of the ceramic silicon rubber fireproof insulated layers, the cable can not only pass static 800 DEG C test in domestic highest-level fire resistant cable test GB / T13033, but also pass a CWZ grade in a fire resistant cable standard BS6387 and completely meet the fire resistant level of a mineral insulated cable, the alkali-free glass tape layer replaces a metal armor layer, and softness of the cable is enhanced.

The invention discloses a high-temperature-resistant high-pressure-resistant odorless explosion-proof cable for a new energy automobile. The cable comprises a central conductor, an insulating layer, a shielding layer and a sheath layer. The central conductor is an annealed bare copper or tin-plated stranded conductor which is formed by interlacing regularly or irregularly; the periphery of the central conductor is tightly coated with the insulating layer; the periphery of the insulating layer is tightly coated with the shielding layer; the periphery of the shielding layer is tightly coated with the sheath layer; the insulating layer and the sheath layer are both made of a special high-temperature-resistant odorless explosion-proof silicone rubber ceramic material, wherein the raw materials of the insulating layer and the sheath layer comprise 5-18 parts of methyl silicone rubber, 3-23 parts of methyl vinyl silicone rubber, 8-31 parts of styryl methyl silicone rubber, 2-6 parts of silicon dioxide, 3-8 parts of aluminum oxide, 1-5 parts of zinc stearate, 1-7 parts of a flame retardant, 2-7 parts of a fire retardant, 1-6 parts of glass powder, 3-10 parts of ceramic powder, and 3-15 parts of other additives; the weight ratio of the glass powder to the ceramic powder is 3.5: 5.8. When a vehicle catches fire, electric energy can be transmitted rapidly and accurately, personal safety is guaranteed, and meanwhile, the requirement for environmental protection is met.

The invention relates to a prefabricated transformer substation, which comprises a base, a case and a top cover, wherein the base comprises a framework, a bottom plate and bonding capsules; the bonding capsules comprise bonding agents and packaging bags; the framework comprises a second installing part; a wall plate is arranged on the framework through the second installing part; the bonding capsules are arranged at the bottom end of the second installing part; the bonding agents break through the packaging bags through the pressure during the installation of the wall plate and are uniformly sprayed between the wall plate and the second installing part. The prefabricated transformer substation has the advantages that during the installation, the bonding capsules are arranged on the secondinstalling part; when the wall plate is in contact with the second installing part, due to the gravity compression during the installation of the wall plate, the packaging bags of the bonding capsulesare extruded, so that the bonding agents in the packaging bags break through the packaging bags and are uniformly sprayed between the wall plate and the second installing part; the goal of fixing thewall plate into the second installing part by pressing the bonding capsules by the self gravity of the wall plate is achieved; the whole installation efficiency is improved; the installation processcan be simplified.

The invention relates to a marine steel-made fireproof door easy to open. The door comprises a door frame and a door body. One side edge of the door body is installed on the door frame through hinges, a circle of sealing strip is installed at the inner side edge of the door body, and when the door body is closed, the sealing strip is attached to the door frame. The door body comprises a steel-made door plate and closure plates on the four sides, a plurality of parallel stiffeners are installed between a front door plate body and a rear door plate body in a welded mode, a calcium metasilicate plate layer is installed on the inner side of the front door plate body, and the portion between the calcium metasilicate plate layer and the rear door plate body is filled with ceramic wool. A locking mechanism is arranged between the door body and the door frame and installed on the inner side of the door body, the locking mechanism comprises four connecting rods which are connected end to end to form a rectangle, and the connection rods are connected through triangular plates; the two ends of each triangular plate are connected with the two ends of the adjacent connection rod respectively, and the other end of each triangular plate is hinged to the inner wall of the door body.

The invention relates to a ceramic fireproof optical fiber composite power cable. The ceramic fireproof optical fiber composite power cable comprises conductors, wherein the number of the conductors is three, an inner ceramic fireproof composite belt is arranged outside the conductors, a filling layer is arranged outside the inner ceramic fireproof composite belt, an optical fiber is arranged in the filling layer, an outer ceramic fireproof composite belt is arranged outside the filling layer, and a low-smoke zero-halogen jacket layer is arranged outside the outer ceramic fireproof composite belt. The ceramic fireproof optical fiber composite power cable is good in fireproof effect, high in allowable working temperature, high in transmission capacity, high in reliability, low in failure rate, easy to install and wide in application range.

The invention discloses a mineral wool formula for ships. The mineral wool formula comprises, by weight, 80-125 parts of silicon dioxide, 30-75 parts of magnesium oxide, 15-25 parts of zinc oxide, 16-26 parts of quartz sand, 10-17 parts of calcium chloride hexahydrate, 10-17 parts of quick lime, 2-3 parts of nanopore aerogel, 10-17 parts of expanded perlite, 13-18 parts of silica powder, 7-18 parts of bentonite and 10-13 parts of pure polyurea. Through mutual cooperation of designed silicon dioxide, calcium chloride hexahydrate, quick lime, silica powder, expanded perlite, rutile titanium dioxide, a centrifugal roller, a second motor, a first motor and a centrifugal cylinder, the problem that based on the existing mineral wool fiber centrifugal fiber forming device, in operation process, mineral wool fiber melt is attached to a centrifugal roller, the melt forms chemical fibers under the action of a centrifugal force of the centrifugal roller, and due to the fact that the centrifugal force applied to the melts by the centrifugal roller is limited, the lengths of chemical fibers are short, and the thermal inertia and heat insulation performance of mineral wool do not meet the usingrequirements is solved.

The present invention provides a single-liquid-type fluorocarbon coating comprising the following components by weight: 40 to 55 parts of a fluorocarbon emulsion, 3 to 6 parts of a diluent, 0.3 to 0.4 part of a wetting agent, 0.2 to 0.7 part of a dispersing agent, 0.1 to 0.6 part of a defoamer, 0.4 to 0.9 part of a thickening agent, 10 to 15 parts of a filler, 15 to 20 parts of a pigment, 20 to 25 parts of water, 1 to 3 parts of nano magnesium oxide and 2 to 4 parts of nano-zinc hydroxide. The present invention also provides a preparation method of the single-liquid-type fluorocarbon coating. The single-liquid-type fluorocarbon coating has good acid and alkali resistance and hardness.

The invention discloses a fire-fighting cable which comprises a fireproof cable with a copper pipe sleeve. Multiple fire-fighting water spray copper pipes are annularly and closely arranged on the outer circumference of the copper pipe sleeve, and the fire-fighting water spray copper pipes are bound and fixed to the outer circumference of the copper pipe sleeve. The pipe wall of each fire-fighting water spray copper pipe is provided with water spray holes. The fire-fighting water spray copper pipes are bound and fixed to the outer circumference of the copper pipe sleeve by a copper wire which is sparsely wound outside the fire-fighting water spray copper pipes. The diameter ratio of the fire-fighting water spray copper pipes to the copper pipe sleeve is 1:4-6. The fire-fighting cable can work normally in a high-temperature environment of fire for a long time. Water can be sprayed into a fire through the cable.

The invention discloses a reamer. The reamer comprises a rack, wherein the rack is provided with an electromagnetic heating device and a reaming device which are arranged from front to back in sequence; the electromagnetic heating device comprises an electromagnetic heating coil; the reaming device comprises a reaming hole driven by a first power device; the rack is provided with a poking plate feeding device; the poking plate feeding device comprises a rotating shaft connected with a second power device; the rotating shaft is transversely arranged on the rack; the two ends of the rotating shaft are fixedly provided with circular poking plates; the peripheral parts of the poking plates are provided with at least three feeding fork entries for conveying metal pipes; poking plates are formed between adjacent feeding fork entries and can rotate to the positions, corresponding to the electromagnetic heating coil and a reaming head, on every two adjacent feeding fork entries respectively. The reamer has the advantages of high production efficiency, small floor area and low power consumption.