91results about How to "Increase bend radius" patented technology

The invention discloses a flexible display device. The flexible display device comprises a flexible display screen and a folding mechanism. The folding mechanism comprises at least two supporting pieces and at least one connecting piece, each supporting piece is movably connected with the corresponding connecting piece, and each supporting piece can rotate and conduct translational movement relative to the corresponding connecting piece, so that when the two supporting faces of each two adjacent supporting pieces are in a folded state; each two supporting pieces can move on the contrary to enlarge the gap between each two supporting faces, therefore the bending radius of a bending part is increased, and the time that a crack and a bending mark are generated on the bending part after the bending part is bent for a long time is delayed; and further the service life of the bending part is prolonged, and the using stability of the flexible display screen is improved.

The invention provides a display panel and a manufacturing method thereof. The display panel is provided with a bending area and a non-bending area, and comprises a flexible substrate, a first routinglayer, an insulating layer and a second routing layer which are arranged in a laminated mode. The first routing layer comprises a plurality of first routings; at least two via holes penetrating the insulating layer are formed in the insulating layer corresponding to each first routing, and the via holes are formed at the positions close to the non-bending areas at two ends of the bending area; the second routing layer comprises a plurality of second routings; the second routings and the first routings are arranged in one-to-one correspondence; and the second routings extend and pass through the via holes to be electrically connected with the first routings. The manufacturing method of the display panel comprises the following steps of: providing a flexible substrate, manufacturing a firstrouting layer, manufacturing an insulating layer and manufacturing a second routing layer. The display panel and the manufacturing method thereof solve the problem that a metal electrode is cracked or broken in the bending area.

The invention discloses a preparation technology of a Low-e bent laminated glass. The technology includes the steps of: a. employing a horizontal double-straight edge machine to conduct edging on Low-e glass substrates through a synchronous belt, then conducting cleaning in a cleaning machine; b. placing the cleaned glass horizontally on a roller way, sending the glass into a convection toughening furnace by the roller way and carrying out one-stage heating treatment; c. taking the heat treated glass out of the furnace and sending it into a bent wind grid, and letting the glass bend along with the bending of the conveying roller way and the wind grid by virtue of self weight; d. laminating the cleaned two or more bent steel glass in a dust-free airtight lamination chamber; e. reheating the bent glass obtained in step d and slowly prepressing the bent glass through a bent glass roller press to remove air; and f. putting the bent glass of step e into an autoclave to conduct heating and pressurization so as to remove residual air. The bent glass process is simple, the produced glass has high tensile strength, bending strength and impact strength and beautiful appearance, and is transparent.

The invention discloses a preparing method for a corrosion-resistant liquid cooling heat dissipation cold plate and aims at providing a cold plate preparing method which is free of tedious treatment before welding and has prominent corrosion-resistant capability and long-term work reliability. According to the technical scheme, the two sides of a bottom transverse pipe commonly communicated serve as the starting points respectively, two sets of parallel pipes are longitudinally arranged continuously in a bent manner, and the bending radius of bent circular arc rings on the two longitudinal sides is larger than the distance between every two parallel pipelines; the free ends of each set of parallel pipes are fixedly connected through respective connector flanges; and the two sets of parallel pipes are fixed, clamped and positioned through pipeline clamping tools which are longitudinally arranged at intervals, die positioning plates with screw holes are adopted, wax patterns wrapping runner titanium pipes and connector flange assemblies are clamped between the two die positioning plates, and the runner titanium pipes and the connector flange assemblies are put into a smelting furnace, and a rectangular flat plate is formed through lost foam casting. The preparing method solves the problem that during traditional cold plate welding, a welding seam is prone to cracking, and consequently a cooling agent leaks.

The invention provides a wide-body elevator balance compensation chain and a production process thereof. The wide-body elevator balance compensation chain comprises an anchor chain and a wrapping layer wrapping the outside of the anchor chain; the anchor chain comprises elements including Fe, C, Si, Mn, Cr, Mo, Ni and Al; the wrapping layer comprises raw materials including a styrenic block copolymer, a thermoplastic elastomer, inflaming retarding silicon master batches, an inrumescent flame retardant, a flame retardant synergist and a processing agent; and the wrapping layer and the anchor chain are poured together to form a solid overall piece. According to the wide-body elevator balance compensation chain, as for an elevator with the width larger than that of a normal elevator compartment, the noise during running is reduced, and the specific gravity with unit length is increased. The wrapping layer has the beneficial effects that softness is achieved, environmental stress cracking resistance is achieved, the hardness is high, the specific gravity is large, the resistance to effect of heat is good, the bending radius is larger than 800 mm, inflaming retarding is achieved, low smoke density is achieved, and aging resistance is achieved; the material hardness reaches 80-90 shore hardness, the anchor chain is high in strength and toughness, the bearing load of the balance compensation chain is large, and the safety performance of the elevators is effectively improved.

The invention relates to a multiphase flow regulation device and a method for restraining slug flow by utilizing same. The multiphase flow regulation device comprises at least one basic unit, each basic unit comprises a front straight tube section and a rear straight tube section, a main bent tube with a bending angle at 180 degrees protrudes upwards and is arranged between the front straight tube section and the rear straight tube section, the main bent tube is connected with the front straight tube section via a front bent head with a bending angle at 90 degrees and connected with the rear straight tube section via a rear bent head with a bending angle at 90 degrees. The multiphase flow regulation device is reasonable in structure, the bending radius of the main bent tube is large, so that a wave-shaped tube is large in 'waving' range, and gas storage at the top of the main bent tube and generation of mixing effect are facilitated. By the aid of the straight tube sections for connecting the basic units, the total length of the multiphase flow regulation device can be adjusted conveniently, and the multiphase flow regulation device can be placed on a plane stably. The method for restraining slug flow by utilizing the multiphase flow regulation device is applicable to severe slug flow and hydraulic power slug flow, and is simple to operate without being allocated with extra hardware and software.

The invention discloses a symmetrical hyperboloid vibration reduction connecting pipe for combined flanges with a self-locking function and a manufacturing method. The vibration reduction connecting pipe comprises a symmetrical hyperboloid flexible pipe body, an intermediate constraint ring and two self-locking type combined flanges, the middle of the symmetrical hyperboloid flexible pipe body issleeved with the intermediate constraint ring, and the two ends of the symmetrical hyperboloid flexible pipe body are correspondingly provided with the self-locking type combined flanges and connectedwith the corresponding self-locking type combined flanges in a locking fit mode. The vibration reduction connecting pipe has the comprehensive properties such as the high pressure resistance, the fatigue resistance, the low rigidity, the high displacement compensating capacity and the excellent vibration reduction property; and through the self-locking type combined flanges, self-locking of a skeleton layer body is achieved when the pipe body is pressed, the rewinding skeleton layer forms an anti-fatigue buffering layer between the inner walls of locking flanges and the pipe body, fastening parts rewinding a skeleton material are locked through clamping grooves between sealing flanges and the locking flanges when the sealing flanges and the locking flanges compress the skeleton material in the working process, and a high-reliability locking anti-pulling function is achieved.

The invention relates to a two-way cable laying operation vehicle for highway. The operation vehicle comprises a chassis assembly, wherein the chassis assembly comprises a frame; the middle part of the frame is fixedly connected to an unwinding device for unwinding cables; the bottom of the frame is equipped with four groups of travelling trolleys for driving the frame to travel; each group of travelling trolleys comprises trolley frames and travelling wheels; two groups of travelling trolley are mounted at one end of the bottom of the frame, and are recorded as active travelling trolleys; thetravelling wheels on the active travelling trolleys are connected to drive assemblies for driving the travelling wheels, and the other two groups of travelling trolleys are recorded as driven travelling trolleys; and the driven travelling trolleys are mounted at the other end of the bottom of the frame. The two-way cable laying operation vehicle reduces labor cost, reduces labor amount of a worker, shortens a construction period, improves work efficiency, is convenient for flexible steering according to arrangement of a railway rail plate, is not liable to cause derailing, achieves guide effect for cables by reducing friction between the cables and the frame in an unwinding process, and guarantees quality of the cables.

The invention relates to a high-temperature resistant miniature armored optical cable which is characterized by comprising an optical fiber, a bushing, an engineering plastic wrapped tube or steel band wrapped and armored tube, an aramid fiber woven mesh or a steel wire woven mesh and an external protective cover from inside to outside in sequence; the optical fiber structure is of a dry type structure; and the engineering plastic wrapped tube is of a spiral shape. The high-temperature resistant miniature armored optical cable is simple in structure, safe and reliable, convenient in use and lower in cost; the produced optical fiber is higher in high-temperature resistance and fire resistance, good in anti-tensioning ability and convenient in large-scale promotion and application.

The invention discloses a pipe-in-pipe structure convenient for optical cable laying and replacing and a laying method. The structure comprises a conveying pipeline and optical cable channels, whereinthe optical cable channels are divided into a plurality of sections; each section comprises a main body and lead-out sections at both ends; the main bodies are fixed on the inner wall of the conveying pipeline; the lead-out sections at both ends respectively pass through corresponding lead-out holes in the conveying pipeline to be led out of the conveying pipeline; and gaps at the lead-out holesare sealed. During laying, micro tubes are fixed on the inner wall of the conveying pipeline to form the optical cable channels and gaps among the micro tubes are sealed to prevent the micro tubes from gas leaking and water leaking; the micro tubes are led out of the conveying pipeline from the lead-out holes every 1500m to 2500m to form the lead-out sections and gaps between the micro tubes and the lead-out holes are sealed to avoid gas leakage and water leakage; optical cables are laid in the micro-tubes of each section and two ends of the optical cables are exposed out of the micro-tubes; and the optical cables of the adjacent sections are fused together, joints are protected by joint boxes and gaps between the optical cables and the micro tubes are sealed. After the micro tubes are laid, faulty optical cables in the micro tubes can be replaced at the lead-out sections without stopping of the medium conveying in the conveying pipeline.

The invention provides an induction-heating pipe bender which comprises a machine tool system, a transmission system, an induction heating system and a clamp system, wherein the transmission system, the induction heating system and the clamp system are arranged on the machine tool system. The machine tool system comprises a machine tool body and horizontal guide rails, the transmission system is borne by the machine tool body, the horizontal guide rails are arranged on the lower portion of the machine tool body, and machine tool body sliders are arranged at the positions, corresponding to the horizontal guide rails, of the machine tool body; the transmission system comprises a longitudinal oil cylinder, chain row devices and a pipe trolley, the longitudinal oil cylinder is fixed on the machine tool body, a piston rod of the longitudinal oil cylinder is connected with the chain row devices, and the pipe trolley is fixed at the upper ends of the chain row devices; the induction heating system is arranged between the machine tool system and the clamp system; the clamp system comprises a clamping piece and a vertical rotating shaft, and the clamping piece is arranged on the upper portion of the vertical rotating shaft and connected with the vertical rotating shaft. By means of the technical scheme of the induction-heating pipe bender, limitation to the bending range of steel pipes can be reduced.

The invention provides a sprayer assembly of a concrete gunniting vehicle and the concrete gunniting vehicle. The sprayer assembly of the concrete gunniting vehicle comprises a spraying device connected with a pumping hose and a drive device for driving the spraying device. The spraying device comprises a connecting pipe, a mixer and a nozzle. The side wall of the connecting pipe is connected with the drive device. One end of the connecting pipe, the mixer and the nozzle are sequentially connected. A bend is further arranged at the other end of the connecting pipe. The two ends of the bend are connected with the connecting pipe and the pumping hose through pipe clamps respectively. The concrete gunniting vehicle comprises the sprayer assembly. Compared with the prior art, the bend and the pumping hose can flexibly rotate along with the action of the sprayer assembly. The bending radius of the pumping hose in the operating process is increased, impact and friction of concrete to the pumping hose are effectively reduced, and therefore the service lives of the sprayer assembly and the pumping hose are effectively prolonged.

The embodiment of the invention provides a supporting film and a display module. The display module comprises a display panel and a supporting film; the supporting film is arranged on one side of thedisplay panel; the display module comprises a first bending area and a bending shaft located in the first bending area; and the thickness of the portion, corresponding to the first bending area, of the supporting film is gradually reduced from the two sides of the bending shaft. According to the scheme, the thickness of the supporting film is gradually reduced from the two sides of the bending shaft, so that the bending shaft has a large bending radius, the stress of the bending shaft of the display panel is reduced, and the problem of display failure of the display panel in the bending process is avoided.

The embodiment of the invention provides electronic equipment, and belongs to the technical field of communication. The electronic equipment comprises a first screen support, a second screen support, a flexible screen, a first hinge, a second hinge, a first gear, a second gear and an annular rack; one end of the flexible screen is fixedly connected with the first screen support, and the other end is fixedly connected with the second screen support; one end of the first hinge is fixedly connected with the first gear, and one end of the second hinge is fixedly connected with the second gear; and the annular rack is arranged on the first gear and the second gear in a sleeving mode, a rack is arranged on the inner side of the annular rack, and the rack is engaged with the first gear and the second gear. Through meshing of the first gear, the second gear and the rack, the first screen support and the second screen support can rotate relatively so as to drive the flexible screen to be switched between a folded state and an unfolded state, and the distance between the first gear and the second gear when the flexible screen is in the folded state is greater than the distance between the first gear and the second gear when the flexible screen is in the unfolded state.

The invention discloses a fireproof wear-resistant copper core armored power cable comprising a butadiene styrene rubber layer. An asbestos flame-retardant layer is fixedly connected on the internal surface of the butadiene styrene rubber layer. A fire-resistant fiber layer is fixedly connected on the internal surface of the asbestos flame-retardant layer. A self-locking steel tape armored layer is fixedly connected on the internal surface of the fire-resistant fiber layer. The self-locking steel tape armored layer is internally provided with a first insulating layer, a second insulating layer, a third insulating layer and a sheath. According to the fireproof wear-resistant copper core armored power cable, the source of fire can be preliminarily isolated for multiple times through the asbestos flame-retardant tape and the fire-resistant fiber layer so as to have great fire isolation effect; besides, the high temperature resistant pipe layer is arranged and the wire core can be protected so that the influence of high temperature on working of the cable can be avoided and the fire resistance of the cable can be enhanced; furthermore, the wear resistance, the heat resistance and the aging resistance of the cable can be enhanced through the butadiene styrene rubber layer, the tensile capacity and the shock resistance of the cable can be enhanced by the self-locking steel tape armored layer and the bending radius of the cable can be increased.

The invention discloses a turnover lifting tool which comprises a main beam and balance beams. The balance beams are mounted at the two ends of the main beam, the main beam and the balance beams are connected through connecting shafts, the balance beams rotate by 360 degrees with the axes of the connecting shafts as axes, and the two ends of each balance beam are connected with crane hooks through rigging. In the turnover process, the main beam is mounted on a main tower, the middle of the main beam is connected with the main tower, and the main beam and the main tower rotate relative to the balance beams at the same time to achieve turnover of the main tower. The turnover lifting tool is reasonable in structural design, and turnover and lifting are carried out at the same time. The connecting faces of the balance beams and the rigging are in arc design, so that the service life of the turnover lifting tool is prolonged. Due to the design of a hydraulic device, the balance beams can be fast detached, and production efficiency and safety degree are effectively improved through the turnover lifting tool.

The invention relates to a low smoke zero halogen (LSZH) insulation and extrusion soft copper bar and a manufacturing method thereof, and belongs to the technical field of copper bar manufacturing. The technical scheme is as follows: a copper product is extruded into strip copper bars through a copper product continuous extruding machine; a mold made of cobalt-base alloy is used by the copper product continuous extruding machine to continuously extrude and anneal the copper product; an LSZH insulation layer is made of LSZH insulation material, and the LSZH insulation material is tightly extruded and wrapped on the strip copper bars in a cable insulation and extrusion manner through a rectangular drawing pipe mould; and the area of the rectangular cross section of the rectangular drawing pipe mould is matched with the sectional areas of the strip copper bars. The LSZH insulation and extrusion soft copper bar has the beneficial effects that the copper bar is good in foldable bendability, and has the characteristics of being high in pressure resistance and good in protection property; the copper bar is insulated for protection, a heat shrink tube is unnecessary when the copper bar is in use, the copper bar is convenient to construct, small in smoke amount and free of halogen during LSZH insulation combustion, and no cold pasting or cracking can be caused at a high temperature.

An improved modular adjusting device, in particular for high-frequency devices, is distinguished, inter alia, by the following features: having at least one transmission base module (113) and at least two transmission elements (17; 29, 31), the at least one transmission base module (113) also has at least one second transmission element (31) and an associated snap-action and / or latching device (16), the at least one second transmission element (31) is held and secured in a snap-in manner by the associated snap-action and / or latching device (16), the snap-action and / or latching device (16) for holding and securing the at least one second transmission element (31) is designed in such a manner that the at least one second transmission element (31) is held in a manner limited by stops in the axial direction (X), and the first and second transmission elements (29, 31) each have a plug-in coupling region (21) in which the shaft (13) or one of the shaft sections (13.1, 13.2, 13.3, 13.4) is connected in a rotationally fixed manner using a plug-in connection.

The invention discloses an electronic device comprising a middle frame assembly, which comprises a first frame body and a second frame body, wherein the first frame body is sleeved in the second framebody, and the first frame body is slidably connected with the second frame body; a flexible screen assembly which comprises a reel and a flexible screen, wherein the reel is arranged on the inner side of the first frame body; and a driving assembly which is arranged on the inner side of the first frame body and is connected with the flexible screen. Under the action of the driving assembly, the flexible screen can be switched between a first screen state and a second screen state; in the first screen state, the second frame body is accommodated in the first frame body, and the screen part, used for displaying, of the flexible screen covers the first frame body; and in the second screen state, at least part of the second frame body is moved out of the first frame body, and the screen part,used for displaying, of the flexible screen covers the first frame body and a part of the second frame body moved out of the first frame body, so that the display effect of the flexible screen can beimproved.

The invention provides a multi-core optical fiber coupler based on a three-dimensional waveguide and a preparation method. The multiplexing and demultiplexing of the multi-core optical fiber are achieved through the three-dimensional waveguide chip, the input end of the three-dimensional waveguide chip is connected with the multi-core optical fiber head, and the output end of the three-dimensional waveguide chip is connected with the single-mode optical fiber head, so the manufacturing difficulty is greatly reduced, and batch production of the three-dimensional waveguide type multi-core optical fiber coupler with low insertion loss is realized. By optimizing the optical waveguide arrangement of the three-dimensional waveguide chip, the optical waveguide spacing of the output end of the three-dimensional waveguide chip is reduced, the bending radius of the waveguide is increased under the condition that the waveguide length is not increased, and the waveguide loss is effectively reduced. The capillary glass tube adopted by the invention can be used for conveniently and quickly preparing a multi-core optical fiber head and a single-mode optical fiber bundle head, so that the coupling efficiency of the multi-core optical fiber coupler is improved, the operation is convenient, the coupler can be upgraded to an automatic coupling system, the product yield, expandability and precision are improved, and stable coupling of a wave optical fiber and a three-dimensional waveguide is realized.

The invention relates to a pre-tensioning method broken-line reinforcement idler wheel bending device shaped like a Chinese character ''fei''. The pre-tensioning method broken-line reinforcement idlerwheel bending device comprises an idler wheel bending device shaped like the Chinese character ''fei'', a mounting base, an anchor bolt and a connecting device connecting the idler wheel bending device shaped like the Chinese character ''fei'' with the mounting base, wherein the idler wheel bending device shaped like the Chinese character ''fei'' comprises a supporting pipe, idler wheels and fixing bolts; the supporting pipe is a round pipe, a base mounting blind hole connected with the upper end of a connecting rod is formed in the bottom of the supporting pipe, and a row of n mounting holesthrough which screws of the fixing bolts penetrate are formed in the upper part of the supporting pipe; and grooves are formed in the middles of the idler wheels, circular holes are formed in the centers of the cross sections of the idler wheels, and idler wheel spacer bushes are installed in the circular holes in a sleeved mode. In the state of installation and use, the screws of the fixing bolts penetrate through the mounting holes in the round pipe, and the idler wheels are installed at the two ends of the screws correspondingly in a sleeving mode. The idler wheels are locked by the head portions of lock nuts and the fixing bolts, and the round pipe and the two rows of idler wheels form a shape like the Chinese character ''fei''. The bending device can avoid the bending point and breaking point effect, protects pre-stressed ribs from being bitten or indented, has convenient construction and good structural mechanical properties, and can prevent the pre-stressed ribs from slipping out.

The invention discloses a combined cable collecting and releasing aviation winch cable arrangement device capable of being used for collecting and releasing cable arrangement of variable-cable-diameter variable-cross-section combined cables. The combined cable collecting and releasing aviation winch cable arrangement device comprises a lead screw supporting structure, a lead screw drive mechanism,a cable guide mechanism and an active traction mechanism. A motor I drives a lead screw to rotate through chain transmission. The cable guide mechanism and a lead screw nut do reciprocating linear movement along the lead screw. By controlling the rotating speed ratio of a drum motor and the motor I, variable-diameter cable arrangement can be achieved. By means of independent chain belts, conveying chains can have large bending radii within limited arc sections, and a large amount of space is saved compared with conventional pulley cable guide. A righting frame is designed into a beak shape onthe basis of the collision mechanics principle, and a streamline body which inclines can be effectively overturned and righted and can smoothly pass the cable arrangement device. By means of the active traction mechanism, the active traction and looseness prevention functions can be achieved by changing the spring expansion and contraction quantity and the rotating speed of a motor II to adjust the friction force exerted by rollers on the combined cables. The whole cable arrangement device is small in weight, small in size and particularly suitable for being used on aviation winches.

The invention discloses a display panel and a preparation method. The display panel comprises a flexible substrate, which is provided with a plurality of first areas and a plurality of second areas, wherein the material of the first areas comprises a cross-linked polymer of a flexible material and a photosensitive curing agent; an array film layer arranged on the flexible substrate and comprisinga thin film transistor, wherein the orthographic projection of the thin film transistor is located in the orthographic projection of the first areas; and the Young's modulus of each first area is greater than the Young's modulus of each second area. According to the invention, the first areas and the second areas which are subjected to cross-linking polymerization are formed on the flexible substrate, and the Young modulus of each first area is larger than that of each second area, so that deformation of the first areas in the bending process can be reduced, the bending radius is increased, the thin film transistor is in a relatively flat state, the problems of damage to the thin film transistor and separation of a film layer are solved, and the reliability of the display panel is improved.

The invention discloses a large-diameter thin-wall small-bending-radius bent pipe with straight sections at the two ends and a hydraulic forming device and forming method thereof, and belongs to the technical field of thin-walled tube bent pipes. The bent pipe forming technological process comprises the steps of preparing a straight pipe blank, numerically controlling the bent pipe, putting a bentpipe blank into a mold and closing the mold, feeding a push head, filling liquid and pressurizing, taking the bent pipe, and cutting the bent pipe. The method has the advantages of being capable of numerically controlling the bent pipe and hydraulically forming the bent pipe at the same time, and has a good forming effect on bent pipes with long straight sections at the two ends and small bendingradius. The mold in the hydraulic forming process adopts an insert structure with damping ribs, and the problems of outer side breakage and inner side wrinkling generated when a small-bending-radiuspipe with straight sections at the two ends is formed through a traditional method are solved. The method is simple in process and high in efficiency, and the produced parts are low in thinning rate.

The invention discloses a high-altitude escape backpack and a rope retractable descent control device thereof. The high-altitude escape backpack comprises a fixing frame; a hub rotatably mounted on the fixing frame and used for winding a rope; and a fixing groove formed in the hub and used for fixing the end of the rope. A guide mechanism used for guiding the rope is further arranged on the fixing frame, the guide mechanism comprises a first roller set and a second roller set, and the first roller set and the second roller set are perpendicular to each other; the first roller set is composed of two first guide rollers arranged in parallel; and the second roller set is composed of two second guide rollers which are arranged in parallel, and the second guide rollers for the rope to be wound are rotationally sleeved with shaft sleeves. By arranging the first roller set and the second roller set, the rope is positioned to limit the rope outlet position, the balance of the descent control device is guaranteed, and therefore the safety is improved.

The invention discloses a steel bar bending machine, and belongs to the technical field of electric power tunnel construction machinery. The technical scheme of the steel bar bending machine comprisesa machine tool, wherein the top surface of the machine tool is provided with a working disc; the working disc is connected to a driving part for driving the working disc to horizontally rotate, a supporting pin shaft is arranged on the top surface of the machine tool on one side of the working disc, and a bending disc is arranged on the top surface of the working disc; a plurality of forming columns are arranged on one side, close to the supporting pin shaft, of the top surface of the bending disc; the plurality of forming columns are arranged in an arc shape, and an arc-shaped center pointsto one side which is away from the supporting pin shaft; bending columns are further arranged on the top surface of the bending disc, and the bending columns are located on one side, close to the supporting pin shaft, of the forming columns. According to the steel bar bending machine, the plurality of forming columns which are arranged in the arc shape, the bending columns and the supporting pin shaft form three acting force points of the bent steel bar, the large bending radius can be conveniently machined, and the machine is not limited by shorter length or larger diameter of the steel bar,and therefore the time and labor are saved.

The invention relates to multi-core optical fibers and cables, and provides several kinds of multi-core plastic optical fibers and a plastic optical fiber cable with the multi-core plastic optical fibers as cable cores. Manufacturing cost of the plastic optical fibers is further reduced, the communication rate of the plastic optical fibers is improved exponentially, and orderliness and attractiveness of wiring the plastic optical fibers at a public place are achieved. Each optical fiber is composed of a fiber core and a cladding, each cladding is lower than the corresponding fiber core in refractive index, total reflection of light is generated on a critical plane from the fiber cores to the claddings, and therefore the light is maintained in the fiber cores; the optical fibers are wrapped by several layers of protection structures before being used, a wrapped cable is called as an optical cable, and the optical cable comprises the optical fibers, a protection layer and a sheath.

The invention discloses a hot melting based X-type cold and hot water cross connecting block and a water pipe parallel laying system. The cross connecting block is a square main body. A cold water flow channel and a hot water flow channel are spaced and crossed in the connecting block, one flow channel curves upwards, and the other flow channel curves downwards. Projections of the two flow channels are crossed in an X shape and do not communicate with each other. The cross section of each flow channel is in a major arc arch shape. The two ends of the cold water flow channel and the two ends ofthe hot water flow channel communicate with four opposite angles of the square main body of the connecting block. One cold water pipe connector and one hot water pipe connector can be derived from each side face of the connecting block. Two cold water pipe connectors and two hot water pipe connectors can be derived from each of the upper and lower surfaces of the square main body of the connecting block. All the connectors can be connected with PPR pipes in a hot melting mode to form cold water and hot water delivery pipes perpendicular to the faces and capable of being connected in parallel.The multi-point parallel derivative cold and hot water pipe system provided with the cold water and hot water pipes laid in the same plane for delivery can be formed. The hot melting based X-type cold and hot water cross connecting block is simple in structure, convenient to install, firm and attractive in appearance, improves the water delivery efficiency and stability and is suitable for all cold and hot water pipe systems and also suitable for delivering different mediums.

The invention discloses a high-temperature-resistant bending-resistant ethylene propylene rubber insulated cable for rail transit and a preparation method thereof. The cable comprises a conductor, anda first polyether-ether-ketone film wrapping layer and a second polyether-ether-ketone film wrapping layer are sequentially wrapped outside the conductor. A 150 DEG C low-smoke halogen-free flame-retardant modified irradiation ethylene propylene rubber insulating layer is extruded outside the first polyether-ether-ketone film wrapping layer and the second polyether-ether-ketone film wrapping layer; a Twaron aramid fiber yarn woven reinforcing layer is woven outside the second polyether-ether-ketone film wrapping layer, and then the second polyether-ether-ketone film wrapping layer is wrappedwith a polyimide film wrapping layer; an outer surface of the polyimide film wrapping layer is coated with a ZS-322 transparent high-temperature-resistant heat-insulating coating, a high-temperature-resistant heat-insulating coating layer is formed after drying, and a high-toughness heat-resistant wear-resistant polyvinylidene fluoride outer sheath is extruded outside the high-temperature-resistant heat-insulating coating layer. The cable has excellent mechanical property, electrical property, high temperature resistance and good flame retardant property.

The invention belongs to a pulley-type hoisting connecting piece which is used in the hoisting industry, aiming at overcoming the defect that a D-type fastener is used in the hoisting industry at present, the position of a steel wire rope is not fixed in the D-type fastener, and the steel wire rope has very small bending radius and centralized stress, so that safety accident is easily caused in the hoisting operation. The pulley-type hoisting connecting piece is characterized in that a left and a right guard boards are provided with a shaft and a bolt rod; the shaft is provided with an upper pulley central jacket, and the bolt rod is provided with a lower pulley central jacket; and the steel wire rope is arranged on the upper and the lower pulley central jackets. The pulley-type hoisting connecting piece increases the bending radius, reduces the stress for the steel wire rope and ensures the hoisting operation to be safe.