240results about How to "Avoid direct contact" patented technology

The invention relates to an electronic blocking device and a case with same. The electronic blocking device comprises a shell, a bolt, a bolt retractable action unit, a control unit and a connecting piece, wherein the bolt retractable action unit is arranged in the shell, is fixedly connected with the bolt and is used to push out the bolt or withdraw the bolt back to the shell; the control unit is connected with the bolt retractable action unit and is used to receive an external control instruction so as to automatically control the motion of the bolt retractable action unit; and the middle of the connecting piece is provided with a hole corresponding to the bolt.

The invention relates to a preparation method for a TA15 titanium alloy surface corrosion resistant and abrasion resistant ceramic coating. The invention solves the problems of bad abrasion resistance of TA15 alloys and severe corrosion of the TA15 and metals which contact the TA15 when the TA15 contacts other dissimilar metals for use in corrosive environment. The invention comprises the following steps that: the TA15 titanium alloys after surface grinding and ultrasonic cleaning are arranged inside a stainless steel bath body which is provided with alkaline electrolytes; the TA15 titanium alloys are used as an anode and the stainless steel bath body is used as a cathode; micro-arc oxidation is performed under the condition of 400 to 600 volt pulse voltage, 400 to 800 herz frequency, 4 to 20 percent duty ratio and 0 to 50 DEG C temperature. The shear strength of the oxide coating obtained by the method reaches 50 to 80 million pascals; when the oxide coating is used on a component of an airplane, a ship or a naval vessel, the coating prevents direct contact of dual components of dissimilar metals and prevents the metals from being corroded.

The invention discloses a core-shell structure nanometer silicon-Mxene composite cathode material and a preparation method thereof. During preparation, the core-shell structure nanometer silicon-Mxenecomposite cathode material comprises the following steps: (1) using a ceramic phase precursor MAX as a raw material, etching the ceramic phase precursor MAX by using HCl+LiF and using deionized waterto wash the ceramic phase precursor MAX to obtain an MXene material; (2) adding the MXene material to a nanometer silicon suspension liquid; carrying out high energy ball milling and dispersing on the MXene material so as to obtain a nanometer silicon-Mxene composite turbid liquid; and drying the nanometer silicon-Mxene composite turbid liquid to obtain a nanometer silicon-Mxene composite powder;and (3) coating the nanometer silicon-Mxene composite powder by using asphalt, and carbonizing the nanometer silicon-Mxene composite powder to prepare the core-shell structure nanometer silicon-Mxenecomposite cathode material. The core-shell structure nanometer silicon-Mxene composite cathode material disclosed by the invention has the advantages that the nanometer silicon and the Mxene with a two-dimensional layer structure are combined by using a high energy ball milling method, and a core-shell structure of a porous network is designed; and therefore, volume expansion in the nanometer silicon particle charging and discharging process can be effectively buffered, direct contact between electrolyte and a silicon interface is stopped, the electrical conductivity of an active substance isimproved, so that the specific capacity and cycling stability of a lithium ion battery are improved in a coordinated manner.

The LCD panel includes the first substrate, one liquid crystal layer, one adhesive frame and the second substrate. The first substrate and the second substrate are set oppositely, and the adhesive frame adheres the first substrate and the second substrate to form one closed space to surround the liquid crystal layer. The adhesive frame separates the first substrate into one central part and one peripheral part, the central part includes one color filter with light spacer in the surface, and the peripheral part has also light spacer.

The invention discloses a non-contact connecting device for transmitting underwater electric energy, which is composed of a socket and a plug, wherein electromagnetic induction coils are arranged in the socket and the plug, can be provided with a standard PM type magnetic core or a standard P type magnetic core and also can be provided with no magnetic cores; an inverter circuit in the socket converts direct current provided by an underwater base station into high-frequency alternating current to produce an alternating magnetic field with the same frequency; and a secondary coil in the socketproduces induced voltage which drives a load after passing through a received switching circuit in the plug. Compared with the traditional connector, the invention transmits electric energy between magnetic fields without direct contact between the plug and the socket, thus avoiding contact wear and greatly improving the reliability and the service life of equipment; in addition, the invention canalso avoid high expense caused by the fact that an underwater robot is used for plugging during underwater moist plugging of connectors.

When manufacturing a bonded substrate using an insulator substrate as a handle wafer, there is provided a method for manufacturing a bonded substrate which can be readily removed after carried and after mounted by roughening a back surface of the bonded substrate (corresponding to a back surface of the insulator substrate) and additionally whose front surface can be easily identified like a process of a silicon semiconductor wafer in case of the bonded substrate using a transparent insulator substrate as a handle wafer. There is provided a method for manufacturing a bonded substrate in which an insulator substrate is used as a handle wafer and a donor wafer is bonded to a front surface of the insulator substrate, the method comprises at least that a sandblast treatment is performed with respect to a back surface of the insulator substrate.

The invention provides a power battery thermal protection system, which is used for carrying out thermal protection on a power battery pack. The power battery pack comprises an upper cover, a lower housing and a plurality of module integration modules which are located between the upper cover and the lower housing and are arranged in the first direction. The power battery thermal protection systemcomprises fireproof thermal insulation pads, which are arranged between the upper cover and the module integration modules, wherein the fireproof thermal insulation pads are in one-to-one correspondence with the module integration modules; and a battery pack explosion-proof valve, which is arranged on the inner side of at least one side edge, in the second direction, of the lower housing, whereinthe second direction is perpendicular to the first direction. The system realizes prolonging of time before the fire of a battery core breaks through a power battery housing when the battery core issubjected to thermal runaway due to heating, thereby leaving enough escape time for passengers, and guaranteeing the safety of the passengers.

The invention relates to a flexible pipe assisted type pipeline returning method. A high-intensity water isolation flexible pipe matched with a pipeline is placed in the pipeline; the flexible pipe and the pipeline are tightly installed employing an arc-shaped pressing plate and fastening bolts on the inner side of the inlet end of the pipeline; slurries in a drill hole enter in the flexible pipethrough a slurry channel of an open type pipe drawing device when the pipeline is returned; after the pipeline is returned, the slurries in the flexible pipe are pumped off from two ends of the pipeline by two submersible pumps; and the flexible pipe is taken out to finish the pipeline returning operation. The method provided by the invention can reduce slurry buoyancy acting on the pipeline whenthe pipeline is returned so as to improve stress state of the pipeline in a pipeline returning process; meanwhile, the method can improve pressure state and flow state of the slurries in the drill hole in the pipeline returning process so as to lower the risk of the pipeline returning process. The method provided by the invention is simple to operate and has the advantages of time saving, safe construction, wide application range and the like.

The invention discloses a method for modifying natural graphite. The method comprises the steps of: (1) using oxidizing acid or salt to carry out oxidation treatment on the natural graphite to obtain an intermediate product graphite A; (2) centrifuging, washing and drying the graphite A to obtain an immediate product graphite B; (3) dissolving a polymer which is used as a shell material into an organic solvent to obtain a polymer solution; (4) adding the graphite B into the polymer solution, stirring the mixture, thus uniformly soaking the graphite B into the polymer solution, stewing the mixture, and evaporating an organic solvent, sieving the mixture to obtain graphite C; (5) curing the graphite C for 0.2-12 hours at 100 DEG C to 600 DEG C under the protective atmosphere to obtain graphite D; (6) carbonizing the graphite D for 1-24 hours at 700 DEG C to 1500 DEG C to finally obtain the modified graphite to be prepared in the invention. According to the method disclosed by the invention, the process is simple, the control is easy, the price is low, and the industrial application is facilitated.

The invention discloses phosphoric acid type feed acidifying agent and a preparation method thereof. The preparation method of the phosphoric acid type feed acidifying agent comprises the following steps of: efficiently adsorbing phosphoric acid in a refined carrier; and encapsulating by using coating material stearic acid and/or hydrogenated oil to prepare the phosphoric acid type acidifying agent. The phosphoric acid type acidifying agent is added to livestock feed for isolating phosphoric acid from external environment, so that phosphoric acid is effectively prevented from directly contacting with alkaline substances in the feed in vitro, and other alkaline nutritional ingredients in the feed are prevented from being damaged, and therefore, the using efficiency of the acidifying agent and the feed is improved. The phosphoric acid type feed acidifying agent is convenient to store, high in stability in a using process and capable of efficiently bringing the effect of the acidifying agent into play, so that the most comfortable digestive tract environment is provided for animals, diarrhea is reduced, digestion is promoted, animal growth performance and feed utilization rate are improved, and therefore, the phosphoric acid type feed acidifying agent is suitable for large-scale production.

The invention discloses an industrial computer main case fixing seat, which comprises a shell and a base, the front and back of the shell are opened, the top of the shell is hinged with a cover plate, and the top of the base is provided with a guide sleeve The inner part of the guide sleeve is provided with a first spring, the bottom of the housing is provided with a guide column, one end of the guide column extends into the guide sleeve and the end is connected with a limit block, the shell The bottom of the body is provided with a bracket, the top of the bracket is fixedly connected with a support block, through holes are evenly opened on the left and right side walls of the housing, and compression rods are penetrated on the left and right side walls of the housing, so that One end of the pressing rod located inside the housing is connected with a pressing plate, the pressing rod between the pressing plate and the housing is provided with a second spring, and the pressing rod is located on the outer side of the housing. One end is connected with a limiting plate, which has high practicability and is suitable for wide promotion.

The invention discloses a laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe. The laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe comprises a housing. A right end of the housing is provided with a laser emission head. A convergent lens and an off-axis parabolic mirror are orderly arranged in a left light path of the laser emission head. The housing at the left side of the convergent lens is provided with a gap. A sample needing to be detected is arranged rightly at the left side of the gap. A plane mirror and a dialyte lens assembly are orderly arranged under the off-axis parabolic mirror. The off-axis parabolic mirror and the plane mirror are coated with broadband dielectric films. The housing under the dialyte lens assembly is provided with an optical fiber end. A doublet and ground glass are orderly arranged at the right side of the plane mirror. The laser-induced breakdown spectroscopy-based hand-held solid waste heavy metal detection probe can detect a detection point which is more than 400mm away from the probe, can avoid direct contact with the solid waste, can protect system and operator safety, has a high integrated level, a small volume and light weight, is in a shape of a pistol, is convenient for operation and carrying, has a low cost and can be realized easily.

The invention discloses a rail traffic level crossing pavement laying strengthening structure and a laying method, wherein by mounting prefabricated limiting blocks on the two sides of a steel rail respectively, fasteners are housed in accommodating grooves on concrete prefabricated blocks of the limiting blocks respectively; the limiting blocks are relatively fixed with the steel rail through filled concrete in the accommodating grooves respectively, so that the fasteners can be effectively avoided from being directly contacted to a pavement concrete layer of a municipal pavement, and the problem that steel rail components are extruded and vibrated for a long time to cause cracking of the pavement is solved; and meanwhile, due to the existence of a steel plate structure, the problem that the pavement structure at steel rail fastener parts are weaker is effectively solved. The pavement laying strengthening structure is particularly suitable for a level crossing for both tramcars and social vehicles to crossly pass, effectively ensures the beautiful degree and the service life of the municipal pavement, also guarantees stable running of the tramcars at the same time and is convenient to overhaul and change the steel rail and the fasteners.

The invention belongs to the field of medical apparatus and instruments, and relates to a functional enterostomy cannula. The functional enterostomy cannula is composed of a drainage tube and an inflation tube, wherein the drainage tube and the inflation tube form a double-cavity structure with the partially shared tube; the inflation tube is composed of a main inflation tube body, an inflation tube branch tube body a and an inflation tube branch tube body b; an inner air bag a is arranged on the outer wall of the end part of the double-cavity structure, an inner air bag b is arranged on the outer wall of the end part of the inflation tube branch tube body b, and an outer air bag is arranged on the outer end opening of the main inflation tube body. A use result shows that the functional enterostomy cannula is simple in manufacturing technology, strong in practicability, and low in daily maintenance cost, the second-time operation needed by the conventional stomy resetting is effectively avoided, thus the pain of the patients is alleviated, the medical cost is reduced, meanwhile, the skin irritation beside the stoma is reduced, the living quality of the patients is improved, and the functional enterostomy cannula is suitable for the intestine protective stomy caused by various causes of disease.

The invention relates to a swing type rotary kiln which comprises a rotary kiln body, a preheater, a feeding system, a cooler, a discharging device, a decomposition gas collecting device, a waste heat power generation device and an exhaust emission system. The rotary kiln is provided with at least one radiant tube, and the at least one radiant tube is inserted in a hearth of the rotary kiln and is in sealed connection with a kiln body casing. The radiant tube is provided with a nozzle and an exhaust gas outlet. The exhaust gas outlet is connected to an exhaust gas main pipe through a connecting hose, and the exhaust gas main pipe is connected to the exhaust emission system through an induced draft fan. A fuel inlet of the nozzle is connected with a fuel pipeline, and a combustion-supporting gas inlet of the nozzle is connected with a blower. The radiant tube is inserted in the hearth of the rotary kiln; a dividing wall of the radiant tube is utilized to heat materials in the hearth of the rotary kiln, the materials are protected from direct contact with burning flue gas, the quality of hot processing material products is improved; the hot processing materials are recycled to be decomposed into gas byproducts, and the economic benefit is improved.

The invention discloses an intelligent clothes drying machine and method. The intelligent clothes drying machine comprises a main body, a fan, a heating device, a clothes hanger and a humidity detector. The main body is a columnar space defined by a side wall, an upper cover and a base plate. The clothes hanger is arranged in the main body and connected to the center of the upper cover of the main body through a connecting shaft, the inner side wall of the main body is provided with the humidity detector, two symmetric side walls of the main body are provided with two symmetric through holes, the heating device is arranged on the through hole in the inner side of the main body, and the fan is arranged on the through hole in the outer side of the main body. According to the intelligent clothes drying machine, the fan and the heating device are arranged on the side of the main body, and short-circuit conditions caused by water dripping from clothes are effectively avoided by combination with a partition and a flow guide plate. An exhaust fan can accelerate gas flow in the main body, a low-speed motor drives the clothes hanger to rotate, so that the clothes are in all-dimensional contact with hot air moving at a high speed, and drying efficiency is high.

The invention relates to a method for reducing the irreversible capacity loss of the cathode material of a lithium ion battery in initial charge. A polymer coating layer of 0.01-10 microns is formed first on the surface of a cathode piece by adopting an electrochemical deposition method; the coating layer is a nano or micron-thick and uniform and dense polymer film, can effectively prevent direct contact between electrolyte and cathode surface, and partially realizes the function of an SEI film so as to reduce the irreversible capacity loss of the cathode material of the lithium ion battery in initial charge. Based on the charge/discharge process of a lithium ion battery and the forming mechanism of an SEI film and aimed at improving the battery circulation efficiency and the reversible capacity, the method provided by the invention is simple and easy to operate, has short preparation period and high efficiency, and can be applied to multiple lithium ion batteries taking other material as cathode.

The invention relates to a full-automatic mixing and paving apparatus for concrete sand and gravel and relates to building waste treatment equipment and facilities. The full-automatic mixing and paving apparatus for concrete sand and gravel comprises a body and is characterized in that two stirring devices are arranged in the body, both the two stirring devices are connected with a power device, the bottom of every stirring device is connected with a connection tube, the connection tube is connected with a piston chamber, a piston is arranged in the piston chamber and is slidably connected with the same, the piston is connected with a piston tube having a hollow structure, the piston tube is connected with a spray plate and is also connected with a moving device, a scraping device is arranged on the right of the piston chamber, each stirring device comprises a feed bucket, a stirring chamber, a stirring rod, stirring blades and a funnel, and the scraping device arranged herein is capable of autonomously moving up and down and is mainly used for scraping concrete and mortar mixture from the spray plate to avoid manual secondary scraping, manpower is saved, and conveniences are brought to users.

The invention discloses a refrigerator, which comprises a refrigerator body, a freezing chamber door body, a refrigerating chamber door body, a freezing evaporator and a heat exchange part, wherein the heat exchange part is arranged in a refrigerating chamber and communicated with a freezing chamber through an air inlet and an air return port; and the heat of the air of the freezing chamber is exchanged with the heat of the air of the refrigerating chamber by using the heat exchange part. According to the refrigerator provided by the embodiment of the invention, cold exchange of the refrigerating chamber and the freezing chamber is realized by using the heat exchange part, direct contact of the air of the freezing chamber and the air of the refrigerating chamber is avoided, and the humidity of the refrigerating chamber can be more than 70 percent, so the freshness-preserving performance of the refrigerating chamber is improved. Moreover, direct impact of the low-temperature cold air of the freezing chamber on the refrigerating chamber is avoided, so the phenomenon of temperature fluctuation in the refrigerating chamber is greatly improved, and the freshness-preserving performance of the refrigerating chamber is improved.

The invention relates to a pedaled inner-outer-partition-type dustbin which comprises a half bin cover, a bin body and a garbage container. A rotary drum is mounted at the upper end of the inner portion of the bin body and directly faces the garbage container at the bottom end of the inner portion of the bin body, one side of the bin body is connected with a side cover, a pedal is mounted at the bottom end of the inner portion of the side cover, the pedal, a connecting rod, a rocker and the bin body form a four-rod mechanism in the side cover, the rocker is connected with a pawl which is mounted on the outer wall of the bin body in the side cover, the pawl is embedded among tooth faces of a rachet wheel through a spring, the rachet wheel is mounted on the end portion, positioned in the side cover, of a rotary shaft of the rotary drum, and the axis of the rachet wheel is coincident with that of the rotary shaft of the rotary drum. The pedaled inner-outer-partition-type dustbin aims at solve the problems of unhappy feelings caused by the fact that users see garbage in dustbins when throwing garbage and free escaping of smells and mosquito breeding in the dustbins, and internal space of the dustbin is constantly isolated from the outside.

The invention provides an endoscope microcapsule robot which comprises a head part, a neck part, a body part and a tail part, wherein the body part is cylindrical; a spiral groove is arranged on the outer surface of the body part; the two ends of the body part are connected with the neck part and the tail part in a rotating manner respectively; the neck part is connected with the head part; a motor for driving the body part to rotate is arranged at the tail part, and is connected with the body part; a sealed cavity is formed among the head part, the neck part, the body part and the tail part in an encircling manner; the motor is arranged inside the sealed cavity. The endoscope microcapsule robot has the benefits that the direct contact between the endoscope microcapsule robot and the intestinal canal wall is avoided to achieve the purpose of lossless drive; a certain point inside a human organ can be observed repeatedly in detail as the forward movement and backward movement of the endoscope microcapsule robot can be controlled through the positive and negative rotation of the motor.

The invention provides a spacecraft high-temperature thermal insulation screen installation device and method. The device comprises a supporting device and a lifting device. The supporting device is detachably connected with the lifting device. The supporting device comprises an upper supporting ring, reinforcing rods, a lower supporting ring and supporting legs. The upper supporting ring is connected with the lower supporting ring through the reinforcing rods. The supporting legs are connected with the reinforcing rods and/or the lower supporting ring. The upper supporting ring and the lower supporting ring are used for instlling a high-temperature thermal insulation screen. The lifting device comprises a body frame and an adjustable supporting structure. The adjustable supporting structure is arranged at the upper end of the body frame and is used for the supporting device. When the high-temperature thermal insulation screen is assembled, direct contact with an easily-abraded thermal control coating face is avoided, the operation difficulty and risk are lowered, and good effects are achieved. The spacecraft high-temperature thermal insulation screen installation device and method are simple in structure and convenient to operate, and rapid installation of the high-temperature thermal insulation screen can be achieved.

The invention discloses an active optical fiber winding device and an optical fiber winding method for an optical fiber laser. The winding device is a radiating disc with a conical shape; continuously arranged winding slots are formed in the conical surface of the radiating disc; each winding slot is provided with two symmetrical slot walls; the section included angle alpha of every two slot walls is 90 degrees; an interval is remained between the adjacent optical fibers in the winding slots. Stress caused by the direct contact between the optical fibers is avoided, a better radiating effect is achieved and the burning loss phenomenon is avoided.

The present invention relates to the technical field of inorganic perovskite CsPbBr3 thin-film photovoltaic cells and specifically relates to a phthalocyanine dye-sensitized CsPbBr3 photovoltaic cell and a manufacturing method thereof. The phthalocyanine dye-sensitized CsPbBr3 photovoltaic cell comprises a transparent conductive substrate, a hole transport layer, a CsPbBr3 3 film photo-sensitive layer, a dye sensitization layer, an electronic transmission layer, an electrode modified layer and a reflective electrode. According to the invention, the energy conversion efficiency of the CsPbBr3 photovoltaic cell is improved, and the service life of the CsPbBr3 photovoltaic cell is prolonged.

The invention discloses a power distribution cabinet convenient to maintain. The power distribution cabinet comprises a cabinet top cover. A power distribution cabinet body is welded at the bottom ofthe cabinet top cover, a clamping plate is clamped on a side of the power distribution cabinet body, a power distribution cabinet door is arranged on the side, which is far away from the clamping plate, of the power distribution cabinet body, cabinet clamp rods are embedded in an end of the clamping plate, cabinet clamp rod grooves are formed in the clamping plate and correspond to the cabinet clamp rods, and a cabinet door handle is welded on the side, which is far away from the power distribution cabinet body, of the power distribution cabinet door. The power distribution cabinet has the advantages that the power distribution cabinet body can be fixed to a wall surface by the aid of the clamping plate and is fixedly connected with the clamping plate by the cabinet clamp rods and cabinetfixing bolts, and accordingly the power distribution cabinet can be quickly mounted, detached and maintained, can be prevented from being in direct contact with a wall and can be protected against moisture; a heat dissipation window closing plate is clamped on the outer side of a heat dissipation window of the power distribution cabinet and is fixedly connected with the power distribution cabinetbody by clamp grooves and bolts, and accordingly heat dissipation and heat preservation of the power distribution cabinet body can be effectively controlled.

The invention discloses a transferring disinfecting device for pollutants in a P3-grade biosafety cabinet. A discharge opening is formed in one side of the biosafety cabinet; an isolating door capable of being opened inwards is arranged at the discharge opening; the disinfecting device comprises a negative pressure exhaust cabinet with a sealed inner cavity, a high pressure disinfecting barrel arranged in the negative pressure exhaust cabinet, and a delivery barrel accommodated in the high pressure disinfecting barrel; the delivery barrel comprises a hollow barrel body, a delivery pipe fixedly connected to the opening part of the hollow barrel body and made of soft material, and an electromagnetic door which is fixedly arranged at the opening part of the delivery pipe and is capable of being opened or closed; a delivery opening for the delivery pipe to pass out is formed in one side of the negative pressure exhaust cabinet; a delivery door capable of being opened inwards is arranged at the delivery opening; the electromagnetic door can be sucked on the outer side of the biosafety cabinet in an electromagnetic manner and is positioned on the circumferential outer side of the discharge opening. The transferring disinfecting device can completely isolate the inner environment from the outer environment, avoids the direct contact between people and pollutants, reduces the labor intensity of operators, and eliminates secondary pollution.

The invention discloses a low-viscosity liquid ring thickened oil conveying and stabilizing device. The device comprises a pipe body, a conveying pump, a liquid storage tank and a connecting pipe; theinner wall of the pipe body is provided with spiral grooves, and the spiral grooves spirally extend to the tail end in the pipe body from the initial end in the pipe body in the axial direction; an inlet of the conveying pump is connected with the liquid storage tank, and liquid with low viscosity is contained in the liquid storage tank; one end of the connecting pipe is connected with an outletof the conveying pump, and the other end of the connecting pipe penetrates through the pipe body and is connected with the initial ends of the spiral grooves. By means of the low-viscosity liquid ringthickened oil conveying and stabilizing device, thickened oil can be kept to be wrapped with low-viscosity liquid rings in the conveying process all the time and prevented from being in direct contact with the inner wall of the pipe body accordingly, and conveying of the thickened oil is facilitated.

The invention belongs to the technical field of medical apparatuses, and particularly discloses a clinical hemostasis rescue device for the cardiology department. The clinical hemostasis rescue devicecomprises a first clamping plate of an L-shaped structure. A second clamping plate is installed on the upper surface of the first clamping plate. A second bolt is rotationally connected with the upper surface of the second clamping plate. The second bolt penetrates through the second clamping plate and extends to the outside. The rear side, close to the second bolt, of the second clamping plate is fixedly provided with a sleeve. The inner side wall of the sleeve is slidingly connected with a stand column. If the distance between the first clamping plate and the second clamping plate is largerthan the width of a hospital bed or a tabletop, the first clamping plate downwards slides, and the width of the second clamping plate is increased through a welding plate; when the widths of the first clamping plate, the second clamping plate and the welding plate are larger than the width of the hospital bed or the tabletop, medical staff make the first bolt penetrate through the first clampingplate and make contact with the welding plate, the welding plate and the first clamping plate are fixed, and the device can be conveniently fixed by the medical staff according to different fixing occasions.

The invention provides a preparation method of a titanium and aluminium dissimilar metal thick plate overlapping structure. The preparation method comprises the steps of firstly, connecting a titanium alloy substrate with a thin aluminium alloy cover plate through adopting explosive welding to obtain a composite board, wherein the thin aluminium alloy cover plate is 1.5 to 3 mm in thickness; and then, connecting the obtained composite board with a thick aluminium alloy plate through adopting friction stir welding to obtain the titanium and aluminium dissimilar metal thick plate overlapping structure, wherein the thick aluminium alloy plate is connected with the thin aluminium alloy cover plate layer in the composite board. According to the preparation method provided by the invention, through a step-by-step connecting method, the problem that the cover plate cracks and is difficult to weld due to the fact that much explosive is utilized during direct explosive welding of titanium and aluminium thick plates is avoided, besides, the problem that a stirring needle is abraded due to the fact that the stirring needle is in direct contact with the titanium alloy substrate during direct friction stir welding of the titanium and aluminium thick plates is avoided, respective advantages of explosive welding and friction stir welding are fully utilized, and a titanium alloy and aluminium alloy dissimilar metal thick plate structure is successfully prepared. The invention further provides the titanium and aluminium dissimilar metal overlapping structure prepared through the technical scheme.

The invention belongs to the technical field of vehicles, and particularly relates to a shock absorber and a vehicle. The shock absorber comprises a connecting plate, a connecting bolt, a first shock-absorbing assembly and a second shock-absorbing assembly, wherein the first shock-absorbing assembly comprises a first sleeve and a first shock-absorbing part; the first shock-absorbing part covers afirst sleeve; the second shock-absorbing assembly comprises a second sleeve and a second shock-absorbing part; the second shock-absorbing part covers a second sleeve; and the connecting bolt sequentially passes through the first sleeve, the second sleeve and the connecting plate. According to the shock absorber of the embodiment, the first shock-absorbing part covers the first sleeve, and the second shock-absorbing part covers the second sleeve to avoid the problem that due effect is lost as a result of damages of the shocker absorber while a positioning metal sleeve is separated from a rubberring if tightening moment of force is relatively great.