126results about How to "Common material" patented technology

The invention discloses a three-electrode integrated electrochemical sensor based on a microelectrode array. The sensor comprises the bismuth film modified microelectrode array (gold working electrode), a silver / silver chloride electrode (reference electrode) and a platinum electrode (counter electrode). The three electrodes are prepared through a standard MEMS technology, and multiple discs at equal intervals are evenly distributed on the gold electrode to serve as the microelectrode array. In the electrochemical detection process, heavy metal gathering and dissolving-out reacting occur on the microelectrode array, and the surface of the microelectrode array is modified with a bismuth film in order to increase the detection type of heavy metal and expand the detection range of the heavy metal. The surface of the silver electrode is electroplated with silver chloride to form the Ag / AgCl reference electrode. The platinum electrode serves as the counter electrode and forms an access with the working electrode. Difference pulse stripping voltammetry is utilized for determining the concentration of the heavy metal, and a result shows that the sensor is high in detection sensitivity, low in detection limit and high in signal-to-noise ratio; the sensor is easy and convenient to operate, needs a small quantity of samples, can be used for rapidly detection heavy metal on site and is capable of efficiently monitoring environmental pollution in real time.

A method for the conticaster to control the solidified structure of cast blank includes providing a HF pulse power supply with positive and negative electrodes, inserting its negative electrode into the molten steel in the crystallizer or tundish of conticaster, electrically connecting its positive eletrode with the steel base of conticaster, and conticasting while regulating the voltages, current and frequency to improve the performance of cast blank.

The invention relates to a construction method for a hanging part of an anti-collision guardrail on an expressway. The construction method comprises the steps that (1) a total station is pre-used to accurately set out the inner side line of the hanging part of the anti-collision guardrail; (2) a ground anchor steel bar is buried on a top plate of a prefabricated box girder, and is fastened with a bottom reinforcing steel tube and an inclined strut steel tube by using a fastener connecting manner, so as to stabilize an inner side template; (3) an outer side template is taken in place by using auxiliary hoisting equipment; (4) a mortar band, which is 2.4cm in height and 5cm in width, is built on the inner side of the inner side template before the inner side template is mounted; and (5), after the templates of the anti-collision guardrail are mounted, a mixer truck is used to be matched with a gantry crane to hoist concrete into the templates, and an immersion vibrator is used to vibrate the concrete, so as to guarantee that the concrete is solid, the color and the lustre are uniform after the templates are detached, and the linearity is attractive. The templates of the anti-collision guardrail disclosed by the invention are simple in structures, materials are ordinary, the processing is convenient, and the cost is lower.

The invention discloses a multi-effect vertical plate falling film solar desalination unit and a method thereof. The device body consists of a seawater storage tank, metal clapboards, sealing rubber, a high concentration seawater storage tank, a fresh water storage tank, pulleys, a reflector, a glass plate and liquid absorbing cotton cloth. The direct radiation, scattering radiation and reflecting radiation of the sun are absorbed by a solar absorption surface and are converted into heat, the heat is absorbed by seawater uniformly distributed in the liquid absorbing cotton cloth for falling film evaporation, generated vapor is condensed into fresh water on a condensing surface, released latent heat is absorbed by the next effect of seawater, and the latent heat is repeatedly used to improve the fresh water yield in a unit daylighting area. Except solar energy, fuels and motors are not required, and the device is simple in structure, convenient to operate, high in start speed and high in water yield, and is particularly suitable for sea islands, deserts, ships and remote areas lacking electricity.

The invention discloses an assistive device for placing working tools, comprising a base and a column spinner, wherein the column spinner is provided with a plurality of hanging arms for hanging the working tools. The assistive device is characterized in that the base is fixedly provided with a mandrel movably sheathed in the column spinner, and the column spinner can rotate relative to the base. The six layer of hanging arms for hanging the working tools are formed, wherein drilled holes on each layer are welded with twelve hanging arms. Because of the adoption of the design of the annular tree structure, more working tools are contained in a limited space. A movable swiveling mechanism is adopted, and employees easily classify the working tools and conveniently fetch the working tools when various types of vehicle are produced in a paint production line, thereby avoiding false and neglected assembly for employees. In addition, a safety guard rail is adopted, so that no potential safety hazard exists in the use process and enough safety is ensured. The assistive device is made of common materials and has the advantages of simple manufacture process, good durability and lower cost.

A strengthened glass-mirror crack sandwich glass and its process are disclosed. The structure consists of normal transparent glass face, upper film layer, strengthened glass-mirror layer, lower film layer and normal transparent glass bottom; upper film layer bonds normal transparent glass face with strengthened glass-mirror layer, normal transparent glass bottom and strengthened glass-mirror layer are bonded by lower film layer. The production is carried out by producing strengthened glass mirror, treating normal transparent glass face, extending upper and lower film layers, spreading strengthened glass-mirror between normal transparent glass face and upper and lower film layers, curing treating and cracking strengthened glass-mirror layer. It has effects of focusing mirror reflect imaging, cracking and glass transparent, and technologies combined with mirror making by mercury, glass strengthening, cracking and adhering.

The invention relates to a multifunctional foamed concrete composite self-heat-preservation block and a forming method thereof. The center of a block body is provided with a middle cavity for filling or pouring foamed materials, and the hollow cavity is a through hole with openings located in end faces of double sides, or a blind hole with an opening located in the end face of one side or a blind hole with an opening located in the side wall of one side; the middle cavity is filled with the foamed materials to form a double-foamed block, or the middle cavity is filled with the foamed materials and naturally shrinks to form a double-foamed block with a hollow chamber. The forming method comprises the steps: firstly, making a die box of the block as required, then, sorting, stirring, foaming and pouring in the die box, and distilling by using an autoclave to obtain a hollow shell, wherein the hollow shell is solid outside and is provided with the middle cavity; and (2) pouring the foamed materials into the middle cavity of the hollow shell in a physical or chemical foaming way according to the ratio of less than 300kg / cubic capacity, and then, forming through natural curing or secondary distilling, wherein the hollow shell is prepared in the step (1). The inner hole of the block provided by the invention is subjected to hollow treatment, so that the heat self-preservation and energy saving effects are good.

The invention discloses a composite biological rotary net device and a synchronous nitrification and denitrification method thereof. The method is characterized by comprising the following steps of: calculating the number of the composite biological rotary net devices to be arranged according to the quantity of waste water to be treated, CODCr (Chemical Oxygen Demand) and the concentration of NH3-N, and placing the composite biological rotary net devices in one same biological reaction tank; adding a microbial agent or introducing activated sludge to form a synchronous nitrification and denitrification period in a process system; starting a reduction box (9) to drive a chain gear (7) to drive an upper rotary frame (3), a lower rotary frame (4) and carriers (10, 11) to rotate, and opening an air pipe valve (8); introducing 1.5-2 mg / L of dissolved oxygen to a water area of the upper rotary frame (3) through a middle single-side aerator pipe (5) so that the dissolved oxygen is provided for a biological film on the biological carrier (10) for an aerobic nitrification reaction; and isolating the diffusion of dissolved oxygen through an oxygen diffusion isolating board (6) and the rotation direction adjustment of the carrier (10). The concentration of water dissolved oxygen on the lower rotary frame (4) is 0.2-1.0 mg / L, and a biological film on the biological carrier (11) performs a biological anaerobic denitrification reaction under anaerobic conditions.

The invention relates to a reflective big-pixel bistable-state color display module, which comprises a transparent panel, a backboard, a plurality of movable lenses, supporting pins and electric conductive elastic fixing pieces, wherein a layer of semipermeable reflective film is arranged on the back side of the transparent panel; a transparent layer covers the surface of the semipermeable reflective film; by virtue of the supporting pins, the transparent panel and the backboard are connected; the side, facing the transparent panel, of the backboard is provided with electrodes; the movable lenses are arranged between the transparent panel and the backboard; the side, facing the transparent panel, of each movable lens is provided with a reflective layer; the movable lenses are connected to the transparent layer or connected to the supporting pins by virtue of the elastic fixing piece; the movable lenses get into contact with the transparent layer or the backboard; and the elastic fixing pieces and the electrodes on the backboard are connected to a driving circuit. The display module provided by the invention is simple in structure, convenient to manufacture and relatively low in cost; the display module is low in energy consumption and excellent in performance under outdoor strong light, and the display module is lightly affected by climate and temperature; and two predetermined contrast colors can be implemented at each pixel, so that the combined display of words or patterns is achieved.

The invention relates to an asymmetric super capacitor with cobalt hydroxide and active carbon as the anode and the cathode respectively and a preparation method thereof. The anode adopts a carbon material / cobalt hydroxide electrode, the cathode adopts a carbon material or a foamed nickel / active carbon electrode, the anode and the cathode are separated by a diaphragm such as a polypropylene sulfonic acid membrane, an electrolyte is an alkaline aqueous solution, and a single super capacitor or super capacitor set is assembled. The cobalt hydroxide of the anode provides a pseudocapacitor and the active carbon of the cathode provides an electrical double-layer capacitor, so that the specific capacitance is effectively improved, and the electric potential working window of the capacitor is widened, thereby improving the energy density of the super capacitor. The cobalt hydroxide material of the anode takes quasi-reversible oxidation reduction reaction, and the active carbon of the cathode performs static physical absorption, so that the asymmetric super capacitor is good in cyclic stability and has a long service life. The super capacitor set adopts a flexible package form, so that the mass energy density of a super capacitor overall device is greatly improved.

The invention discloses a day-night type high-multiplying-power high-definition continuous zooming optical lens. The optical lens comprises a front fixation group G1 with the positive focal power, a zooming group G2 with the negative focal power, a compensation group G3 with the negative focal power, a diaphragm STO, a rear fixation group G4 with the positive focal power, a filter lens, and a camera target surface Simage, wherein the units are arranged coaxially and successively from an object side to an image side. The focal lengths of the front fixation group G1, the zooming group G2, and the compensation group G3 meet the following relational expressions: f1 / ft is larger than or equal to 0.32 and is less than or equal to 0.36; f2 / f3 is larger than or equal to 0.37 and is less than or equal to 0.41, wherein the f1 expresses the focal length value of the front fixation group G1, the f2 expresses the focal length value of the zooming group G2, the f3 expresses the focal length value of the compensation group G3, the ft expresses the longest focal length value of the optical lens. The optical lens has the high-multiplying-power continuous zooming function and is capable of realizing all-weather offset-focusing-free high-definition imaging.

The invention discloses an automatic transmission mechanism for cylindrical workpieces, and relates to the field of transmission mechanisms. The automatic transmission mechanism for the cylindrical workpieces comprises a first platform, a second platform, inclined plates, lifting plates and a driving mechanism; the first platform and the second platform are vertically arranged, the inclined plates are used for connecting the first platform with the second platform, the lifting plates can ascend and descend between the first platform and the second platform, and the driving mechanism pushes the lifting plates to vertically move; holes are formed in the corresponding positions of the first platform and the second platform, and the lifting plates are matched with the holes in shape; and the inclined plates are connected between two adjacent holes of the first platform and the second platform. The automatic transmission mechanism is simple in structure and high in transmission efficiency.

The invention discloses a dynamic hydrogen charging slow tensile test device for a metal bar-shaped sample. The device comprises an electrochemical hydrogen charging device, a liquid carrying table, the bar-shaped sample and a clamp. The bar-shaped sample penetrates through the liquid carrying table through the clamp and is fixed, and the electrochemical hydrogen charging device is connected withthe liquid carrying table. A scale distance section and an arc transition section of the bar-shaped sample are positioned in a columnar container, and the scale distance section is immersed in the electrolyte of the columnar container. The problems of hydrogen charging potential safety hazards, limited hydrogen charging content and hydrogen escape are solved. The device has the advantages of beingsimple in structure, easy and convenient to operate, accurate in experiment parameter, good in sealing performance and capable of keeping a complete sealed state and simulating actual working conditions to the maximum extent.

The invention provides an optical fiber micro-displacement sensing and calibrating device and method. The position change of the optical fiber can be remotely monitored in real time in a high sensitivity way. The device can also calibrate the position. The light emergent end of a light source is connected with the light input end of a measured single-mode optical fiber. The measured single-mode optical fiber and a gradient multimode optical fiber equipped with a micro-displacement SPR sensing probe are fixed on a three-dimensional micro-displacement platform through optical fiber clips with the two end surfaces opposite. . The light emergent end of the gradient multimode optical fiber is connected with the receiving end of a spectrograph. The SPR phenomenon occurs when the light is transmitted to the gradient multimode optical fiber to the SPR sensing probe through the measured single-mode optical fiber. If the position of the measured single-mode optical fiber has micro-displacement,the transmission path of the light in the gradient multimode optical fiber changes, and the SPR incident angle and resonance trough position changes so as to realize micro-displacement sensing. The reference sensing spectrum of the measured single-mode optical fiber is marked, and the sensing reference spectrum of different micro-displacement is summarized. The sensing reference spectrum is compared and the three-dimensional micro-displacement platform is adjusted so that the sensing spectrum and the reference spectrum are enabled to be overlapped in case of micro-displacement calibration.

The invention discloses a quick wall whitewashing machine. The quick wall whitewashing machine comprises a handle and a roller, and further comprises a gear, a pin shaft, a fixing shaft, a fixing frame and a rack, wherein the fixing frame is connected with the roller; a fixing block and brake blocks are arranged on the fixing frame; the brake blocks are arranged on the periphery of the roller; the fixing block is connected with the gear through the fixing shaft; the gear rotates around the fixing shaft and is meshed with the rack; a support rod is arranged on the gear; a brush is arranged on the support rod; the handle is connected with the fixing frame through the pin shaft. According to the quick wall whitewashing machine, the gear is meshed with the rack and connected with the support rod, the support rod is connected with the brush, and the motion of the roller is conveniently and accurately transferred to the brush, so that the quick wall whitewashing machine can whitewash a wall with the roller as well as the brush, thereby speeding up the wall whitewashing progress and effectively saving time; the quick wall whitewashing machine is simple in structure, selects and uses common materials, and is convenient to popularize and apply.

The invention discloses a pedal type stain removing machine which is characterized by comprising a base (1), a plurality of water tanks (2) and a plurality of water absorbing devices (3). The water tanks (2) and the water absorbing devices (3) are arranged on the base (1). Water outlets of the water absorbing devices (3) are connected with water inlets of the water tanks (2). Water inlets of the water absorbing devices (3) are connected with water outlets of water absorbing devices (4) used for absorbing water stains on the ground. The top face of a front row water absorbing device set (5) and the top face of a rear row water absorbing device set (6) are connected with an elastic pressing device (7) capable of moving vertically. The elastic pressing device (7) is connected with a lever (9) through a connecting rod (8). The outer walls of the water absorbing devices (3) are of longitudinal telescopic structures. The water inlets and the water outlets of the water absorbing devices (3) are one-way water stopping valves. The pedal type stain removing machine is simple in structure, convenient to implement, environmentally friendly, low in manufacturing cost and suitable for being widely applied and popularized, labor is saved, and materials are common.

The invention discloses a plasma display screen with an interdigital electrode structure, which belongs to the technical field of flat plate display. A bus electrode of an X electrode on a front plate and a bus electrode of a Y electrode are arranged horizontally; and the X electrode and the Y electrode have interdigital structures, are arranged vertically and are connected with respective bus electrode vertically and crossly. Compared with the prior art, the plasma display screen has the advantages of simple structure, high luminous efficiency and the like.

The invention discloses a lightweight soundproof thermal insulation wall brick. The wall brick is prepared from, by weight, 170-190 parts of silica sand, 80-90 parts of cement, 35-45 parts of lime, 17-24 parts of ardealite, 25-35 parts of coal ash, 0.3-0.5 part of aluminum powder, mica powder and 320-360 parts of water, wherein the mica powder accounts for 7-9% of the total dry weight. Compared with an organic foaming method, an inorganic foaming method has advantages of high corrosion resistance, fireproof performance and environment friendliness. The wall brick prepared from the raw materials according to the method is about 0.34g / cm<3> in bulk density, 1.6Mpa in compressive strength, 0.07W / m.K in thermal conductivity and 40db in soundproof effect.

The invention discloses a vacuum air intake regulating valve comprising a valve body, a tapered piston, a compression spring and a quick air pipe joint, wherein the valve body comprises a quick KF joint at the head, a corrugated pipe in the middle and a threaded through hole formed in the tail; the quick air pipe joint is connected with the tail of the valve body through the threaded through hole; an air intake regulating chamber is arranged inside the valve body; the tapered piston comprises a piston part and a connecting rod connected with the piston part; the air intake regulating chamber comprises a cylinder; a circular cavity of which the diameter is larger than that of the threaded through hole is arranged inside the cylinder; and a tapered hole is formed in the upper part of the circular cavity. The vacuum air intake regulating valve is relatively small in size, free of electronic elements, capable of voluntarily regulating, simple in structure, low in cost, stable and reliable in working, convenient to mount and dismount, convenient and simple in use and capable of playing a favorable regulating role and is made of a common material which can be voluntarily selected as required; and the vacuum air intake regulating valve is not needed to be powered by electricity, gas and liquid so that power operation is not needed.

The invention discloses a mushroom pickup trolley used in a factory. The trolley comprises a supporting device, handrails, idler wheels, a winding stair and a lifting device, wherein the supporting device comprises supporting pillars, a supporting frame and a supporting plate, the supporting frame and the supporting plate are perpendicularly connected with the supporting pillars, the supporting frame is a square frame used for fixing the winding stair, the supporting pillars are located at the center of the supporting frame, the supporting plate is arranged on the bottom surface of the supporting frame, and the bottom end of the supporting plate is connected with the idler wheels; the winding stair is arranged on the supporting plate, the inner side of the winding stair is fixedly connected with the supporting pillars, the outer side of the winding stair is fixedly connected with the supporting frame, the winding stair is arranged around the supporting pillars in a rotary mode, the lifting device comprises a pulley arranged at the top end of the supporting frame, a rope penetrating through the pulley and a hanging basket connected to the rope, and the handrails are arranged at one end of the supporting plate. Due to the adoption of the winding stair, space is saved, the problem that mushrooms at different altitudes can not be picked up at a time from the same position is effectively solved, and the trouble that only mushrooms at a fixed altitude can be picked up at a time is avoided.

The invention relates to a gearbox rework support frame and an assembling and disassembling method thereof. The support frame comprises a support mechanism, a workbench, a sliding wheel and a liftingmechanism; the workbench is arranged on the top of the support mechanism and can slide along the horizontal direction; the lifting mechanism is arranged on the support mechanism and can drive the workbench to move up and down along the vertical direction; and by the scheme, the assembling and disassembling maintenance efficiency of an existing automobile gearbox can be improved, and the maintenance cost and difficulty are reduced; and the structure is simple and practical, and the material cost is low.

The invention relates to a preparation method of phosphoric acid activated eucalyptus charcoal and application thereof in adsorbing Cr (VI) in water. The preparation method includes: cutting the dried eucalyptus into slices, soaking and washing the slices for three times, drying the slices in a drying oven at the temperature of 60-80 DEG C for 48 hours, crushing the slices, and sieving the crushed slices with a 30-mesh sieve to obtain eucalyptus powder; and putting the obtained eucalyptus powder into a muffle furnace, heating to 500 DEG C at a heating rate of 10 DEG C / min, pyrolyzing for 1 hour, washing with deionized water for three times, and drying in a drying oven at 60 DEG C for 24 hours to obtain the eucalyptus charcoal. soaking 8-10 g of eucalyptus charcoal in 40-50 mL of a 40% phosphoric acid solution for 10 h at the room temperature, placing the soaked eucalyptus charcoal in a 200 ml crucible, and performing pyrolysis in a muffle furnace at 450-550 DEG C for 1 h at the heating rate of 10 DEG C / min, washing the eucalyptus activated charcoal for three times in deionized water, and drying the eucalyptus activated charcoal at 55-60 DEG C for 24 h, and packaging the driedeucalyptus activated charcoal in plastic sealed bags and perserving the eucalyptus activated charcoal in a drying condition. The method disclosed by the invention is simple, common in medicament, easily available in raw materials and available in actual running operation. Based on the local eucalyptus in Guangxi, the raw material cost is saved.

The invention discloses a novel positioning device for ocean engineering. The upper end of a fixing plate is connectedly abutted against the lower end of a hook, the hook is in threaded connection with a nut, and a plurality of buffering devices are arranged above the nut. By additional arrangement of a first fixing component and a second fixing component, a great shaking prevention effect can beachieved; by a plurality of groups of the buffering devices in the first fixing component, an excellent buffering effect is achieved during relative movement between a rope and the fixing components.The novel positioning device is normal in material and low in requirement of machining accuracy, thereby being low in manufacturing cost and maintenance cost. In addition, by the novel positioning device, service lives of the rope and the fixing components can be greatly prolonged, and production cost and operation cost are sharply saved.

The invention discloses a cylindrical cam device with a reconfigurable contour. The cylindrical cam device comprises an inner cam body, an outer cam body and cam inserting pieces. The inner cam body is disposed in the outer cam body and fixedly connected with the same through bolts. The inner cam is coaxial with the outer cam body. An annular groove is formed between the inner cam body and the outer cam body. Cam inserting piece depth adjusting holes are formed in the bottom of the outer cam body. Each cam inserting piece is disposed in the annular groove, and part of the bottom of the cam inserting piece is exposed in the corresponding cam inserting piece depth adjusting hole. Each cam inserting piece is in interference fit with the annular groove. By the cylindrical cam device, any movement law requirements of a driven part can be satisfied, the outer contour of a cam can be adjusted simply and conveniently, and any contours can be reconfigured. The cylindrical cam device is simple in design, common in material, convenient to manufacture, economical, high in adaptability, and convenient to popularize and apply.

The invention discloses an aluminum-made vertical heat sink device with high temperature distribution uniformity. The heat sink device consists of fin tube array sides, a metal corrugated soft pipe, a plurality of thermal insulating material layers and a temperature acquisition system, wherein an eight-prism-shaped side surface is formed by eight fin tube array sides being 460mm*1160mm; two fin tube array sides being 1120mm*1200mm are respectively used as the top surface and the bottom surface of the heat sink device; the metal corrugated soft pipe is connected with the surfaces so as to integrate an inner cavity of the whole heat sink device; thermistors in the temperature acquisition system are adhered to the outer surface of the heat sink device; and the plurality of thermal insulating material layers are wrapped at the outermost surface of the device. The aluminum-made vertical heat sink device has the advantages of good temperature distribution uniformity, good cooling effect, rapid cooling speed, small size, convenience in operation and maintenance, and the like, and has a good practical value and an application prospect in the field of space technologies.

The invention discloses a novel dry fully-prefabricated assembled concrete frame connecting system, including beam-column dry ductile connections and inter-column dry connections. Each beam-column dryductile connection is mainly composed of a prefabricated concrete column, prefabricated concrete beams, connecting bolts, section steel connecting end plates, embedded steel liner plates, prefabricated concrete beam end anchor plates and embedded steel liner plate anchor bars. Each inter-column dry connection is mainly composed of an upper prefabricated concrete column and a lower prefabricated concrete column, upper high-grade concrete reinforcement blocks and lower high-grade concrete reinforcement blocks, and an upper column end steel plate and a lower column end steel plate used togetherwith the columns and reinforcement blocks. The frame connecting system of the invention has the advantages of simple structure, reasonable structure and common materials. Meanwhile, by using the mature concrete structure and steel structure engineering technology, the frame connecting system has reliable performance, works stably, and can be widely used in various structural engineering.

The invention relates to a northern lawn maintenance method comprising the following steps: (1) watering: a watering amount is 2-5cm every week during drought growing seasons; the watering amount should reach 6-8cm every week during hot and drought periods; and sprinkle-watering is carried out 1-3 times every day when the lawn is just withered; (2) fertilizing: fertilizing is carried out 1-3 times respectively in springs and in autumns; fertilizing should be comprehensive and uniform; and irrigation is carried out instantly after fertilizing, for enhancing the fertilizer effect; (3) trimming: a 1 / 3 principle is followed, and trimming amount and trimming frequency can be increased during springs and autumns; a trimming trend should be crossed by at least 30-40 DEG with the trend of the last trimming; trimming speed is not too fast or too slow, and trimming path is straight; cutting surfaces of each trimming reciprocation should be overlapped by 8-12cm; and (4) weeding: a herbicide should be sprayed 1-3 times every spring and autumn. The steps are clear and simple; materials are common; and cost is low. The method is suitable to be used by or used as a reference by professional or non-professional growers. The operation method is simple and convenient.

The invention relates to a plant callus culture utensil which comprises a petri dish and an upper cover, wherein the petri dish is in seamless gap connection with the upper cover; a detachable recyclable connecting strip for fixation is arranged between the petri dish and the upper cover; convex points in mutual symmetry are arranged between the petri dish and the upper cover to achieve buckle type fixed connection of the petri dish and the upper cover; a columnar ventilation cavity layer is arranged right in the middle of the upper surface of the upper cover; the columnar ventilation cavity layer is provided with a cover part with small vent holes and a bottom which is integrated with the upper cover of the petri dish in an injection molding manner and is provided with a ventilation membrane; and the cover part with the small vent holes can be opened to replace degreased cotton or the ventilation membrane inside the cavity layer. The plant callus culture utensil is capable of effectively solving the defect that the cover plate and the bottom of a conventional petri dish are not stable, and is simple to process, environmentally friendly and effective, convenient to operate, beneficial to sunshine radiation, capable of effectively preventing bacterium invasion to damage plant tissue and ensuring circulation of air and moisture, and beneficial to culture of plant callus tissue.

The invention relates to an assistive device for covering residual liquid during automobile coating. The assistive device is characterized by comprising a covering plate (5); a fixed rod (1) is arranged at one end of the covering plate (5); two positioning columns are further arranged on the lower surface of the covering plate (5); the covering plate (5) is fixed above an automobile body front fender through the cooperation of the fixed rod (1), the two positioning columns and technological holes in the automobile body front fender; the two positioning columns comprise the long positioning column (3) and the short positioning column (4) and are used for supporting the covering plate (5), so that a certain gap is formed between the covering plate (5) and the automobile body front fender; an anti-disconnection foot (41) is arranged at the tail end of the short positioning column (4); the assistive device further comprises an auxiliary fixed rod (2); and the auxiliary fixed rod (2) and the fixed rod (1) are arranged in parallel and connected with the covering plate (5) through a connecting rod (6). The assistive device is convenient to mount and dismount, operation of staff is facilitated, and the production efficiency is improved.

The invention relates to a tertiary buffering device for mitigation of automobile collision. The tertiary buffering device comprises a rubber layer, an airbag layer and a spring layer and can be mounted at one part, easy to have a collision, of an automobile, such as an automobile head, an automobile tail and side positions of the automobile. The rubber layer, the airbag layer and the spring layerare arranged in sequence from right to left; the rubber layer is bonded with the airbag layer through sticky connection; the airbag layer is fixedly connected with the spring layer through a bolt; the spring layer is fixed at one part easy to have a collision, such as the automobile head, the automobile tail and an automobile door, through a bolt; two pressure limiting holes are formed in the airbag layer and controlled by a pressure limiting opening mechanism; and when the pressure in the airbag layer reaches a preset value, the pressure limiting mechanism is started so that the air in an airbag enters into the pressure limiting holes via air holes in the two sides of the pressure limiting mechanism and are exhausted via air exhaust holes in the two sides of the spring layer. According to the tertiary buffering device, the impact force generated in the automobile collision process can be effectively neutralized, the damage degree of the automobile can be reduced, the passenger safetycan be protected, the manufacturing cost is low, and the device is effective and practical.