218results about How to "Facilitate contact area" patented technology

The invention relates to a method and a device for desulfurizing exhaust smoke of a sea-going ship, which uses sea water to reduce discharge of sulfur dioxide and other pollutants of the sea-going ship. The method comprises the following steps of: sea water scrubbing, acidic sea water transferring, acid separating treatment, water discharge and so on. The device comprises a scrubber and a water-saving acid separator, wherein, the upper part of the scrubber is provided with a scrubbing layer, and is communicated with a scrubbing sea water pump through a pipeline; the lower part of the scrubber is provided with a cooling layer; one end of the scrubber is communicated with a smoke exhaust pipe of a ship engine through a scrubbing inlet pipe, while the other end of the scrubber is connected with a scrubbing exhaust pipe; the lower part of the scrubber is communicated with the water-saving acid separator; and the water-saving acid separator is connected with a mixed sea water pump, a draught fan and a main discharge pipe for suitably discharging sea water which is subject to the acid separating treatment. The method and the device have the advantages of high desulfurizing efficiency, small sea water consumption, low equipment manufacturing cost and low running cost.

The invention provides an integrated spray flue gas waste heat recovery and denitration device. The device comprises a spray filler and alkali storage tower (1), a flue gas conveying and oxidization loop system, a spray conveying loop system, a heat energy utilization system and an alkalifying neutralization system, wherein the spray filler and alkali storage tower (1) comprises a spray filler and alkali storage tower main body structure part (11), a spray filler and alkali storage tower connector, filler (13), a dehydrator (14) and a spray component (15). According to the device, spray water is in contact with flue gas for heat exchange through the filler with a large specific surface area, the stable contact heat exchange area of gas and liquid phases is remarkably increased, the contact time of gas and liquid phases is remarkably prolonged and the uniformity of gas and liquid phases is remarkably improved, and the performance and the stability of gas liquid heat exchange are remarkably improved, so that the flue gas waste heat recovery efficiency and the denitration / desulfurization effect are remarkably improved.

The invention provides a grafting method of an ornamental elm. Scion used in the operation process is treated by 2% cross-linked chitosan solution before storage, so that the fresh-keeping effect of the scion is improved and the stored scion has higher activity; when a rootstock is cut, the section of the rootstock is formed a 15-degree angle with limb, so that the separation of cortex and xylem is more favorable, and the grating efficiency is increased; when the scion is cut, two faces are long cutting faces, so that the contact area between the rootstock and a scion forming layer is increased, and the combination of the rootstock and the scion is more firm; moreover, since the grating method provided by the invention is fast in speed and high in efficiency, the water loss of the rootstock and the scion is less, and the oxidation and browning degree of the incision is low, so the survival rate of the graft can be greatly improved, and the survival rate of the graft is above 95%. The grating method of the ornamental elm provided by the invention is simple and easy to carry out; the ornamental elm grafted by the method can grow fast and shape rapidly, the crown size in the current year can reach above 1.2 m; the ornamental elm can be transplanted in the same year for grafting, thus, the grafting method is a garden and horticultural technique with stronger practicability.

The invention discloses a heat radiation structure of a circuit module and an outdoor unit of a variable-frequency air conditioner. The heat radiation structure comprises a circuit board (1), a mounting support (2), electronic devices (3) and a heat radiator (4), wherein the electronic devices penetrate one side of the mounting support to be connected with a circuit board on the other side, and the heat radiator is abutted against the surfaces of the electronic devices; a zigzag structure (21) used for reducing mutual contact area is formed on the contact surface between the circuit board and the mounting support. Furthermore, the heat radiation structure comprises an electric control box (5), various parts are sequentially stacked in the electric control box, the heat radiator extends out of the electric control box, and an air inlet passage (7) facing the heat radiator is formed on the electric control box. The heat radiation structure is mounted in a case (9) via the electric control box and close to an air wheel (12) of the outdoor unit. With the zigzag structure, water accumulation is well prevented; with the mounting structure and the air passage, heat radiation effect of the heat radiator is well improved so as to radiate heat on the surface of the circuit board.

The invention provides a manufacturing method for a positive electrode of an all-solid-state lithium battery. The manufacturing method comprises the following steps: step 1, providing a mixed pressed active pole piece, putting the active pole piece and sulfide in a vacuum sealed tube, carrying out heat treatment at a temperature of 200 to 1000 DGE C for 1 to 20 h and then carrying out slow cooling to room temperature so as to obtain a sublimated positive plate; and step 2, placing the positive plate on a current collector coated by a conducting adhesive and carrying out cold pressing and drying so as to prepare the positive electrode. The invention further relates to the positive electrode prepared by using the method. The all-solid-state lithium ion battery prepared by using the method provided by the invention has the following advantages compared with traditional all-solid-state lithium batteries: since gaps among solid-solid particles of the battery are filled with amorphous sulfide exerting connection and bridging effects, contact areas of the solid-solid particles of the battery are substantially improved, lithium ion transport paths are increased, and thus, conductivity is improved, internal resistance of the battery is reduced, and energy density and rate capability of the battery are enhanced.

The invention provides an optical membrane. The membrane comprises a transmission basal plate, a plurality of strip bumps and a plurality of bump structures, wherein the transmission basal plate is provided with a first surface and a second surface which are oppositely arranged; the strip bumps are arranged on the first surface, each strip bump is provided with two strip lateral faces; the bump structures are arranged on ridges of the strip bumps, each bump structure is provided with a raised end and two wing parts; the raised end is protruded from the ridge of corresponding strip bump; the two wing parts are respectively positioned on the two strip lateral faces of the corresponding strip bump, each wing part extends from the raised end to the position between the ridge and a valley line; the length of the bump structure in the direction parallel to the extending direction of the ridge is L, and the width of the bump structure in the direction vertical to the ridge is W, and L / W is more than or equal to 1.2. By the optical membrane, at least one of veins, local adhesion, scrape and abrasion of the optical membrane with other optical elements can be effectively improved.

The invention provides a catalyst for use in synthesis of dioctyl terephthalate and a method for preparing dioctyl terephthalate by applying the catalyst. The catalyst consists of a catalyst 1 and a catalyst 2, wherein the catalyst 1 consists of an ionic liquid and a metal compound; the catalyst 2 consists of a titanium metal compound and other metal compound; the positive ion of the ionic liquid are an imidazole ion or a benzimidazole ion; the negative ion of the ionic liquid is a bisulfate ion; or the positive ion of the ionic liquid is a benzimidazole ion or an imidazole ion with one or two sulfonic acid radicals; the titanium metal compound is selected from at least one compound of tetrabutyl titanate, isopentyl ester titanate, isopropyl titanate or titanium dioxide; and the other compound is selected from at least one compound of dibutyldimethoxytin, dibutyltin oxide, monooctyl ester stannite, zinc acetate and cobalt acetate. Due to the adoption of the technical scheme provided by the invention, the cost can be reduced, the reaction speed is increased, energy consumption is lowered, and the quality of an obtained product is high.

A pneumatic module includes an actuator assembly and a manifold. The actuator assembly includes a main body having a bore, an armature, overmolded primary and secondary plates, a coil and a frame. The manifold includes a valve seat, a control port and a supply port. When the actuator is in a de-energized state, the armature is forced against the valve seat by a spring, sealing off the supply port from the control port. When the actuator is in an energized state, current flows through the coil, thereby generating a magnetic field. The magnetic field forces the armature to move toward the primary plate, causing the valve seat becomes unsealed. Once the valve seat is unsealed, fluid flow is permitted between the supply port and the control port. The one end of the armature has an endcap to minimize mechanical noise generated by movement of the armature against the spring. The frame surrounding the actuator assembly has flanges extending from both ends. These flanges correspond to wells located within the manifold. The flanges and wells are configured such that when the flanges are inserted into the wells, the actuator assembly can be twisted and locked into the manifold without requiring additional traditional fasteners, such as bolts or screws.

The invention provides a linear porous titanium dioxide material and a preparation method and application thereof. The linear porous titanium dioxide material is of an anatase-phase structure and a monocrystalline structure, and structurally consists of a plurality of particles; each particle has the fixed growth direction. The invention also provides the preparation method and application of thelinear porous titanium dioxide material. The titanium dioxide porous nanometer line has the advantages that the long axis of the structure is suitable for the effective transfer of electrons, so as tofacilitate the hydrogenation by photolysis of water, or degradation of organic pollutants by photocatalysis; the porous structure is suitable for the quick embedding-in and embedding-out process of lithium ions, sodium ions or potassium ions; the large specific surface area is suitable for the contact area between an electrolyte and an electrode, so that the current density is reduced, and the better battery quick charge and discharge property is realized.

The invention discloses a converter duplex steelmaking technology, comprising molten iron pretreatment outside a converter, converter smelting, and secondary refining outside the converter. The converter smelting comprises a dephosphorization technology and a decarbonization technology; the converter smelting is completed in two converters, wherein, the dephosphorization technology is completed in a converter 1, and the decarbonization technology is completed in a converter 2. In the steelmaking technology, the dephosphorization technology and the decarbonization technology of the converter smelting are performed in two converters, the technological parameters are respectively adjusted singly, and the functions of the converters are unique; the thermodynamic contradiction between dephosphorization and decarbonization in the steelmaking technology is eliminated; the product quality is increased, the oxygen blowing time of each converter is greatly shortened, and the smelting cycle is further shortened; little slag smelting is realized; manganese ores can be added in the decarbonization technology to adjust the thermal equilibrium and increase the final content of manganese; the amount of manganese iron during the tapping process is reduced; the smelting advantages on high manganese steel, ultra-low phosphorus steel, etc. are more prominent; the smelting cost is lowered.

The invention discloses a mixed heat dissipation device for a lithium battery pack, and relates to the technical field of battery thermal management. The device comprises a box body, an air cooling assembly, a phase change energy storage heat conduction plate, a liquid cooling assembly, a plastic box cover and a plastic bottom plate. A plurality of groups of placing holes for placing battery cellsare formed in the plastic bottom plate. Each group of placing holes consists of a plurality of placing holes which are arranged in parallel and obliquely. Two adjacent groups of placing holes are symmetrically arranged to form an air duct for airflow to pass through. An included angle between the placing hole and the front surface of the box body is 10 + / -5 degrees. The bottom of the battery cellis positioned at the upper part of the placing hole. The phase change energy storage heat conduction plate is mounted at the lower part of the placement hole, and the upper and lower ends of the phase change energy storage heat conduction plate are contacted with the battery cell and the liquid-cooling assembly. The mode of combining air cooling, the phase change composite board and liquid cooling is adopted, rapid heat dissipation of the lithium battery can be achieved, the heat dissipation efficiency of the lithium battery is improved, the defect that the heat dissipation efficiency is lowin a pure liquid cooling or pure air cooling mode is overcome, and heat dissipation of the battery pack is more uniform and more efficient.

The invention discloses a soil and water loss control method based on microbial mineralization, and belongs to the field of soil and water conservation. The soil and water loss control method based onmicrobial mineralization comprises the following steps: (1) slowly spraying urease-producing microbial liquid on the surface of a soil body, and keeping for 6-12 h after spraying; (2) slowly sprayinga cementing solution on the surface of the soil body after the microbial liquid is sprayed, and keeping for 6-12 h; and (3) repeating the step (1) and the step (2) 3-5 times, and standing for air drying. According to the invention, the microbial liquid is directly and slowly sprayed on the surface of the soil body, the aim of directly carrying out microbial mineralization reinforcement on the soil body is achieved through an MICP technology, and the erosion resistance of the soil body is effectively improved. The method is simple in steps, can effectively control soil and water loss, and is asimple and efficient method for controlling soil and water loss.

The invention discloses an aligning and levelling device for a rotating platform of an ultra-precise measuring machine, which comprises a lower static-pressure disc of the rotating platform, a plurality of levelling devices, an aligning device and a universal levelling plate. The top of the lower static-pressure disc of the rotating platform is provide with a concave spherical surface and a plurality of grooves distributed symmetrically; the lower part of the universal levelling plate is provided with a convex spherical surface; the universal levelling plate is arranged on the top of the lower static-pressure disc of the rotating platform; the convex spherical surface of the universal levelling plate is matched with the concave spherical surface of the lower static-pressure disc of the rotating platform; and the lower mounting surface of the rotating platform is arranged on the universal levelling plate directly. The aligning and levelling device can be used for the large-diameter part measuring rotating platform; the spherical surfaces of the aligning and levelling device match with each other and have the advantages of large contact area, easy aligning, stable movement and strong bearing capacity; and the two spherical surfaces grind mutually when a spherical surface contact pair is used, have a good contact area and self-repairing functions and can improve the adjustment precision, the stability and the reliability of the aligning and levelling device.

The invention discloses a self-propelled work platform moving across a medial strip barrier of a motorway, and the platform comprises a vehicle body, a barrier crossing moving device, a ground wheel lifting device, a power transmission device, and a machine and tool carrying device. The invention belongs to the field of motorway maintenance machinery. Compared with the prior art, the platform is advantageous in that (1), the medial strip barrier of the motorway serves as a running space for operating machines and tools, thereby effectively solving a problem that a conventional vehicle-mounted operating machine occupies a normal operating lane; (2) the platform employs the design of the barrier crossing moving device, clamps the medial strip barrier through an upper contour wheel and a lower contour wheel, enables the medial strip barrier to serve as an operating guide rail, achieves bidirectional cross moving through a drive contour wheel, and is stronger in capability of resistance to derailing of the whole machine; (3) the platform employs the design of the ground wheel lifting device, can enables the whole machine to achieve the ground moving of the lower contour wheel as occasion requires, and can be pulled to move under the condition of no fence.

Semiconductor manufacturing system for loading semiconductor wafers into a vertical reaction tube and performing a thermal process has a first wafer loading boat mounted in the reaction tube and having holder supporters to support a wafer holder in a shape of a board, a second wafer loading boat having a wafer supporter, a plate cap, a door plate, and a lifting system which moves the wafer loading boat(s) vertically. Semiconductor manufacturing system capable of loading semiconductor wafers into a vertical reaction tube and performing a thermal process comprises a first wafer loading boat (10) which is mounted in the reaction tube and includes holder supporters that support a wafer holder (25) in a shape of a board, a second wafer loading boat (20) which is inside or outside the first wafer loading boat and has a wafer supporter that is located under the semiconductor wafer (100) to support the semiconductor wafer, a plate cap (40) which supports the first wafer loading boat and the second loading plate in their lower portions, a door plate (50) which supports the plate cap in the lower portion of the plate cap, and a lifting system (70) which moves at least one of the first wafer loading boat and the second wafer loading boat vertically and separates the semiconductor wafer, which is loaded on the wafer holder, from the wafer holder at a predetermined height during wafer load and unload cycles.

The invention relates to a silica supported polyamine water treatment agent, an application thereof and a preparation method. Hydrophilic polyamine polymers are loaded on silica particles above a millimeter grade covalently; the water treatment agent is obtained, wherein polyamine is cationic, and can capture anionic dyes in water efficiently; and the silica particles provide very large surface area, and can filter and remove the dyes from the water conveniently. A pH (potential of hydrogen) range of the water treatment agent is acid, neutral and alkalescent. When an adsorbing agent wrapped with the dyes is treated by strong alkali, most dyes can be released partially, some dyes can be released wholly, so that the water treatment agent can be reused. The water treatment agent is mainly suitable for treating the wastewater containing the anionic dyes. The water treatment agent is simple in synthetic process, and high in productivity, and can be stored for a long term under the nitrogen atmosphere; and the property of the water treatment agent is reduced slightly after the water treatment agent is stored under a common air condition for months.

The invention provides a foldable suspension-type artificial ligament, comprising a first traction line part (11), a first tibia tunnel weaving part (21), a first joint inner free fiber part (31), a thighbone tunnel weaving part (4), a second joint inner free fiber part (32), a second tibia tunnel weaving part (22) and a second traction line part (12). The beneficial effects of the invention are as follows: when artificial ligament is used for rebuilding human anterior cruciate ligament, the fixation of the artificial ligament is enhanced and the contact area of the artificial ligament and the bone tunnels is increased. Thus, the union of the artificial ligament and bone tunnels is promoted. In addition, the artificial ligament is simple in structure and convenient for use.

The invention discloses a high-precision valve micro pump driven by a temperature control shape memory alloy. The high-precision valve micro pump comprises a temperature control shape memory alloy spring II, a temperature control shape memory alloy spring I, a cooling ceramic pipe, an upper end cover, a pump body shell, a piston I end cover, a slide bearing, a snap spring, a connecting flange, an external driving joint, a piston II, a one-way valve, a pump cavity, a piston I, and electrifying terminals A, B, C and D; the cooling ceramic pipe is fixed on the upper end cover; the temperature control shape memory alloy springs I and II are inserted in the cooling ceramic pipe, and are positioned on two sides of the piston I end cover; the piston I can slide in the slide bearing; the slide bearing is mounted on the pump body shell; and the pump cavity is connected with the pump body shell through the connecting flange. Compared with a traditional micro pump, the high-precision valve micro pump is excellent in structure heat dissipating property, tightness and one-way stop performance, and can normally work under the condition of high frequency by using the cooling effect of the cooling ceramic pipe.

The invention discloses a negative pressure type regulating valve for vacuumizing. The negative pressure type regulating valve comprises a valve body, a valve rod, a seal assembly, a locknut, a first nut, a positioning pressing sleeve, a rotating hand wheel, a second nut and a third nut. The valve body is of a T-shaped three-way structure; a regulating internal thread is arranged in an inner cavity of a first joint of the valve body; the valve rod is of an integrated structure composed of a conical seal head and a long connecting rod; a regulating external thread is disposed at the tail end of the long connecting rod; the regulating external thread is in threaded connection with the regulating internal thread; a mounting groove is further formed in the valve body; a seal gasket is mounted in the mounting groove; the seal gasket is in conical surface seal connection with the conical seal head of the valve rod when the regulating valve is fully closed; the seal assembly is mounted at the outer end of the inner cavity of the first joint; the positioning pressing sleeve is connected with the tail end of the valve rod; and the rotating hand wheel is fixedly arranged on the positioning pressing sleeve in a sleeving mode. The negative pressure type regulating valve for vacuumizing is high in sealing performance, high in functionality and capable of effectively controlling the vacuum degree and improving vacuumizing effect.

The invention provides a glass compartment door structure of an agriculture and forestry plane. The glass compartment door structure comprises a door frame and compartment door glass arranged in the door frame, and is characterized in that the door frame is a welded piece formed by welding an aluminum panel and a cap type profile frame; a compartment door frame is formed by welding a cap profile straight section and a cap profile U-shaped section; the compartment door glass and the door frame are screwed with each other through battens after being overlapped; rubber plates 0.5 mm in thickness are respectively adhered to two sides, which are in contact with the door frame, of the compartment door glass; screw connection holes are formed in the compartment door glass; rubber linings are mounted on screws during connection; the surrounding of the door frame is covered with tubular rubber sealing profiles; an antitheft lock is arranged at the upper side of the door frame; an antitheft lock seat is mounted on a steel structure of a plane body. The glass compartment door structure is high in buffering property, high in durability, convenient to turn over and favorable for boarding.

The invention discloses basalt fiber with high breaking strength, and relates to the technical field of fiber processing. The basalt fiber is formed by preparing a basalt fiber initial material through nanosilicon dioxide modified basalt mineral powder, and then performing in situ amidoximation modification on the basalt fiber initial material. The basalt fiber has better breaking strength and impact strength.

The invention discloses a processing and control method of gear lapping machine, which comprises the following steps: detecting whether the input data is within the setting scale; setting the lapping parameter; affirming the gear rotary direction; obtaining the feeding speed and lapping parameter of moving side gap value; entering the lapping preparation state; slaving the shaft back side gap; extending the lapping arm; closing the front door; supplying power to the composite pump; starting the lapping circulation subprogram; resetting after lapping; breaking circuit to finish the lapping operation; counting the workpiece. The invention can select the lapping position and lapping speed of each point and loading braking torque of driven wheel freely, which realizes the needed fabricating function as long as the operator inputs or changes the fabricating parameter.

The invention belongs to the technical field of material chemistry and particularly relates to a graphene / porous iron oxide nano-rod compound and a preparation method thereof. The compound comprises graphene and Fe2O3 nano-particles loaded on graphene, and the Fe2O3 nano-particles adopt cellular porous structures. The compound is simple in synthetic method, and low in raw material cost.

The invention relates to a processing technology and device of an optical fiber plasma liquid. According to the invention, optical fiber pipes are utilized and uniformly ranked, and gas is introduced in the optical fiber pipes; a plasma is generated at a micropore optical fiber pipe orifice or end head by utilizing atmospheric pressure discharge; the area of the plasma is micro-controllable, the contact area of the plasma and a processing material is good, a processing effect can be obviously improved, and the energy utilization rate is greatly improved; and discharge gas is restricted by using optical fiber so as to generate a micro-plasma in a liquid at the atmospheric pressure to process a polluted liquid sample. The processing technology and device have the following specific advantages that gas utilization rate is high, discharge manner is simple, complicated vacuum equipment is not required, equipment cost is low, fungicidal efficiency is high, and energy consumption is low.

The invention relates to an elastic conductor. The elastic conductor is characterized by comprising an elastic base body and a conductor semi-continuously distributed in the elastic base body in the length direction, wherein the elastic base body comprises a surface base body and a core base body; the surface base body covers the core base body to form a surface layer; the conductor is semi-continuously distributed in the core base body to form a conductive path. The elastic conductor can be used under the condition of stretching; when stretched within a certain range, the resistance of the conductor is basically kept unchanged; the elastic conductor can be widely applied to the fields of earphone wires, folding cellphone screens, computer screens and the like.

The invention relates to a preparation method of magnetic self-healing microcapsules, and belongs to the technical field of microcapsule preparation. The preparation method comprises the steps as follows: firstly, a silane coupling agent is hydrolyzed, molecules of the silane coupling agent simultaneously contain a reactive group capable of being chemically bonded with an inorganic material and a reactive group capable of being chemically bonded with an organic material, silanol is generated by hydrolysis and is bonded with an inorganic substance to form siloxane, the ferroferric oxide nanometer magnetic nanoparticles are dispersed in water for hydroxylating the material surface and react with silanol generated from the silane coupling agent through hydrolysis. Compatibility between the materials is improved due to the firm bonding; the magnetic particles are loaded into a curing agent, magnetic curing agent particles are loaded into a wall material through in-situ emulsion polymerization, and a microcapsule material is formed; after rupture or mechanical damage, a magnetic curing agent material is agglomerated due to mutual attraction between the magnetic particles, so that the contact area between the material and the curing agent is effectively increased, the material curing rate is increased, the self-healing process of the material is effectively improved, and rapid and effective self-healing of the material is realized.

The invention discloses a supporting mechanism for selectively laser-melting and forming a metal component, and relates to the field of 3D printing. The supporting mechanism comprises a metal base plate, a metal component which is arranged on the metal base plate and is selectively laser-molten and formed, and further comprises a supporting base plate, wherein a plurality of supporting parts are movably arranged on the upper end surface of the supporting base plate; the top end of the supporting part is in the shape of a pointed head; the bottom ends of the supporting parts are distributed inthe form of an array; the top end of each supporting part forms a unique plane; elastic bulges are arranged on the front side wall and the rear side wall of the supporting base plate; two slide railsare arranged on the metal base plate; through holes are formed in the slide rails; the supporting base plate is in sliding connection with the slide rails; the elastic bulges are matched with the through holes; and the elastic bulges are detachably connected with the through holes. The supporting mechanism can realize stable supporting for the metal component, and can conveniently take down the metal component when appearance integrity of the metal component is guaranteed.

The invention discloses an oil cooling electric driving force rotor structure, and the structure comprises a motor shaft and a rotor iron core assembly installed on the motor shaft; the motor shaft comprises a main shaft body and an inner insertion pipe, the main shaft body is provided with a cavity and a main oil hole communicated with the cavity, the inner insertion pipe is inserted in the cavity, the side surface of the inner insertion pipe is provided with a main oil outlet, and the main oil outlet is communicated with the main oil hole; an inner cavity of the inner penetrating pipe is communicated with a cavity of the main shaft body through the main oil outlet, one end of the inner inserting pipe is sealed, the other end of the inner inserting pipe is open, the rotor iron core assembly is provided with an oil channel, one end of the oil channel is communicated with the main oil hole of the main shaft body, the other end of the oil channel is communicated to an air gap in the periphery of the rotor iron core assembly, and the hole diameter of the main oil hole is larger than that of the main oil outlet. According to the scheme, the cooling and heat dissipation effects of the motor are greatly improved, and the power density is instantly improved; meanwhile, the oil liquid passes through the structure of the inner insertion pipe to avoid volume oil of the main shaft, the stator is further cooled after the rotor is cooled by the oil liquid, the oil consumption of the electric drive assembly is reduced, and the high-temperature demagnetization risk is avoided.

The invention discloses an operation platform climbing to a central separation barrier of an expressway, and belongs to the field of maintenance machines for the expressway. The operation platform comprises a vehicle body, a climbing barrier running device, a lower wheel lifting device, a power transmission device and a machine tool carrying device. Compared with the prior art, the operation platform has the beneficial effects that the central separation barrier of the expressway is effectively used as running space of an operation machine tool, so that the problem that a traditional vehicle-mounted operation machine occupies a normal traveling lane is solved; the design of the climbing barrier running device is adopted, the central separation barrier is clamped by an upper contour wheel and a lower contour wheel, and dual-way climbing is achieved with the upper contour wheel and the lower contour wheel as running guide rails, so that the good guiding performance is guaranteed, the contact area is effectively increased, interference of stand columns of the barrier is avoided, and the derailing-prevention capacity of the overall operation platform is greatly strengthened; and the design of the lower wheel lifting device is adopted so that lower contour wheel touchdown running of the overall operation platform can be achieved in necessity, and external force dragging running under the condition that the barrier does not exist can be further achieved.

The invention discloses a preparation method for a Ti-Al system gradient protective screen material, and the preparation method improves sample connecting performance through a method of improving anatom contact area at a diffusion welding physical contact stage. The preparation method specifically comprises the following steps of: (1) selecting and designing a gradient protective screen body system; (2) performing orientated grinding treatment on the surface of a to-be-connected Ti / Al system sample; (3) performing oriented assembly on the Ti / Al system to-be-welded sample; and (4) performinglow-temperature connection on the Ti / Al system sample. The preparation method can realize low-temperature high-strength connection between the titanium alloy and the aluminum alloy; the prepared Ti-Algradient material is good in welding joint combination, is simple and convenient to operate and is small in control difficulty in comparison with a conventional welding joint, is low in preparation temperature, is low in cost, is free of an intermetallic compound, is small in joint residual stress and is extremely good in performance; and the Ti-Al system gradient protective screen material has shear strength of 128 MPa, and is used as a gradient protective screen which is novel and reasonable in structural design in comparison with a conventional protective screen, is small in density and isgood in protective effect.