489results about How to "Improve placement stability" patented technology

The invention provides an acidic chemical and mechanical polishing composition. The pH value of the acidic chemical and mechanical polishing composition is 2-7, and the acidic chemical and mechanical polishing composition comprises 1-20% by weight of abrasive material, 0.5-10% by weight of oxidant, 0.1-10% by weight of complexing agent, 0.001-1% by weight of corrosion inhibitor, 0.001-5% by weight of organic film-forming auxiliaries and the balance of pH regulator and deionized or distilled water, wherein the abrasive material is of colloidal silica sol after modification in the special step, and the average particle size is of 10-200nm. According to the chemical and mechanical polishing composition provided by the invention, the abrasive material is refined and modified; by using the method, the stability of the abrasive material in polishing slurry can be effectively upgraded, and polishing removal rate and surface roughness degree are respectively optimized to a certain extent; and the unique adding effect of the organic film-forming auxiliaries can well balance the strength of chemical corrosion action and the strength of mechanical grinding action, and achieve the effects of improving polishing removal efficiency and performing global planarization.

The invention discloses an embedded vehicle-mounted cup fixing saucer assembly which comprises an installation panel, an outer cup saucer, an inner cup saucer, an ejector rod, a rotating shaft and a cup bearing cover. The inner cup saucer is fixed on the inner wall of the outer cup saucer, the installation panel is welded to the top ends of the outer cup saucer and the inner cup saucer, a cup inlet is formed in the middle of the installation panel, a containing cavity is formed in the inner cup saucer, and the cup bearing cover is arranged in the inner cup saucer. The embedded vehicle-mountedcup fixing saucer assembly is installed in an embedded mode, is convenient to assemble and saves space, and when a tea cup is not placed in, a bearing spring drives the cup bearing cover to slide upwards until a sliding block abuts against the top of a sliding groove, a reset spring drives the ejector rod to move upwards, and a clamping head is moved out of a locking groove and does not clamp theinterior of the containing cavity; and when the tea cup is placed in, the cup bearing cover slides downwards by the aid of the weight of the tea cup, and the clamping head penetrates through the locking groove to clamp and fix the tea cup placed in the containing cavity, so that the tea cup is conveniently supported and fixed, the placement stability is good, and the tea cup is not liable to topple.

The invention discloses an automatic clamping type hoop device for a petroleum transportation pipeline. The automatic clamping type hoop device comprises a cover plate, a reset spring, a supporting rod, a bearing plate, a rubber block, a pipeline clamping groove, an inner bracket and an outer bracket. The inner bracket is fixed to the inner wall of the outer bracket. The cover plate is mounted atthe top of the inner bracket. The rubber block is arranged in the inner bracket. The pipeline clamping groove is formed in the upper end of the rubber block. The bottom end of the rubber block is fixed to the bearing plate. The automatic clamping type hoop device is convenient to mount; when the automatic clamping type hoop device is not arranged in a petroleum pipe, the rubber block is driven bythe reset spring to slide upwards, and a clamping jaw moves out of the clamping groove and does not clasp or clamp the interior of the inner bracket; and when the automatic clamping type hoop device is arranged in the petroleum pipe, the rubber block slides downwards through the weight of the petroleum pipe and the weight of petroleum conveyed in the petroleum pipe, the clamping jaw penetrates through the clamping groove to clamp and fix the petroleum pipe arranged in the inner bracket, the petroleum pipe can be clamped and fastened conveniently, the cover plate is used for secondary fixation,and laying and fixing of the petroleum pipe are ensured.

The invention relates to the fields of sand-fixing agent preparation and environment protection. According to the invention, with vinylacetate (VAC) as a main monomer, methyl methacylate (MMA) as a hard monomer, butyl acrylate (BA) as a soft monomer, ammonium persulfate (APS) as an initiating agent, lauryl sodium sulfate and tween-60 as a complex emulsifying agent and water as a dispersion medium, a macromolecular environmentally-friendly sand-fixing dust suppressant, particularly a VAC / MMA / BA terpolymerization sand-fixing dust suppressant which is used for fixing sand, is prepared by emulsion polymerization without the use of any organic solvent.

The invention relates to a sand-fixing agent preparation method field and the environmental protection field, which essentially adopts seed emulsion polymerization technology to synthesize the butyl acrylate-modified polyvinyl acetate emulsion sand-fixing agent and is used for fixing the sand.

The invention discloses a biodegradable waterborne polyurethane sand fixing agent and a preparation method thereof. The sand fixing agent is obtained by taking biodegradable oilgomer polyols of which the hydroxyl value is 200-400 mgKOH / g as a raw material and taking ammonia water as a neutralizing agent with a stepwise polymerization method; and the solid content of the sanding fixing agent is 30-45 percent, the pH value is 6-8, and the viscosity at the temperature 25 DEG C is 20-500 mPa.s. In the stepwise polymerization method, a polymerization reaction is undergone on biodegradable oilgomerpolyols of which the hydroxyl value is 200-400 mgKOH / g, diisocyanate, dimethylolpropionic acid, a neutralizing agent, a latent solvent and a catalyst to form a performed polymer, and deionized water is added for emulsifying to obtain the sand fixing agent. The biodegradable waterborne polyurethane sand fixing agent has the advantages of biodegradability, nontoxicity, incombustibility, using safety, environmental friendliness, rich in nutrition and the like; and as an ecological nutrient sand fixing agent, the biodegradable waterborne polyurethane sand fixing agent can be applied to the fieldsof agriculture, forestry, construction and the like.

The invention relates to a multifunctional foldable integrated table-chair and belongs to the technical field of office furniture. The multifunctional foldable integrated table-chair comprises a base bracket, a seat cushion, a backrest, a first side upright column and a second side upright column, wherein the first side upright column and the second side upright column are positioned on two sides of the base bracket; a writing board mechanism is arranged on the first side upright column; an article placement frame mechanism is arranged on the second side upright column; the seat cushion is positioned on the base bracket between the first side upright column and the second side upright column; the backrest is connected with the seat cushion through an incomplete ratchet mechanism to achieve the change of an angle between the backrest and the seat cushion. The multifunctional foldable integrated table-chair has the advantages of simple structure, convenience in mounting, small occupied area and the like.

The invention relates to the technical field of fire protection equipment machining auxiliary devices, in particular to a fire protection pipeline outer wall grinding device. By means of the fire protection pipeline outer wall grinding device, the containing stability of a ground fire protection pipeline on a grinding table can be improved, and usage reliability is improved; and grinding through manual usage of an electric hand drill is not needed, manpower is relieved, the grinding effect is improved, a grinding wheel can well make contact with the outer wall of the fire protection pipeline,and usage limitation is reduced. The fire protection pipeline outer wall grinding device comprises a grinding table, two left support columns, two right support columns, a left fixing plate, a right fixing plate, two left limiting sliding blocks, two right limiting sliding blocks, a left baffle, a right baffle, a left adjusting lead screw, a right adjusting lead screw, a left upper sliding block,a left lower sliding block, a left upper supporting plate, a left lower supporting plate, a right upper sliding block, a right lower sliding block, a right upper supporting plate and a right lower supporting plate are included. A rear side plate, a left rotation shaft, a right rotation shaft, a gear motor and a fixing block are further included, and a drive gear is arranged at the output end of the left portion of the gear motor and engaged with a driven gear.

The invention discloses a preparation method and a usage method of a low-viscosity flame-retardant heat-conducting solvent-free polyurethane electronic-pouring sealant. The electronic-pouring sealant comprises a component A and a component B, wherein the component A is prepared by means of the following process: adding 100 parts of castor oil, 5 to 15 parts of flame retardant, 1 to 5 parts of high heat conductive insulation composite powder and 0.05 to 3 parts of an anti-foaming agent into a reaction kettle in parts by mass, performing uniform mixing and vacuum dehydration, then adding 0.05 to 0.3 part of a catalyst, and performing uniform mixing to obtain the component A; and the component B is liquefied diphenylmethylene diisocyanate. In the invention, a high heat conductive insulation composite powder heat conduction technology, a polyurethane in-situ polymerization self-flame-retardant technology and a thermal sensitive catalyst asynchronous catalysis technology are adopted, the product viscosity is smaller than 6000mPa.s, the heat conduction coefficient is greater than 1.85W / MK, the volume resistivity is greater than 4.2*10<12>omega.m, and the flame retardant property can be up to the American FMVSS302 standard.

The invention discloses a projector supporting frame for teaching, and belongs to the field of educational appliances. The projector supporting frame for the teaching comprises a bottom supporting disc, wherein a supporting circular pipe is fixedly welded to the middle part of the upper end of the bottom supporting disc; a receiving box is fixedly connected to the upper end of the supporting circular pipe; an adjusting threaded rod is inserted in an upper circular hole; the lower end of the adjusting threaded rod penetrates through a lower circular hole; a U-shaped mounting plate is fixedly welded to the upper end of the adjusting threaded rod; L-shaped clamping plates are correspondingly and movably arranged on the two sides of the upper end of a transverse plate of the U-shaped mountingplate; a projector body is clamped between the two L-shaped clamping plates; and a movable reverse cover is hinged to one side of the upper end of the receiving box. According to the projector supporting frame, the projector is convenient to fix and disassemble, the height and the angle of the projector can be adjusted, at the same time, the projector can be received, and very good dust-proof andprotective effects on the projector can be realized.

The invention relates to a drinking cup making bedridden patients drink water easily. The drinking cup comprises a cup body, a cup lid matching the cup body, and a cup handle arranged at one side of the cup body. The drinking cup further comprises a hard water pipe. The lower part of the cup body is in threaded connection with a hollow cup holder with an open top. The hard water pipe is of an L-shaped structure composed of a vertical pipe and a horizontal pipe which are connected. A hollow tubular sealing portion extends upward from the bottom inside the cup body. The upper end of the vertical pipe is in threaded connection with and penetrates through the sealing portion, and the top end is equipped with a sealing cover matching the sealing portion. The side wall of the upper end of the vertical pipe is uniformly provided with multiple water holes in a penetrating manner. One end of the horizontal pipe is connected with the vertical pipe, and the other end passes through the side wall of the cup holder to be disposed outside. The end, disposed outside, of the horizontal pipe is communicated with one end of a corrugated pipe, and the other end of the corrugated pipe is communicated with a suction nozzle. The drinking cup provided by the invention has an easy-driving function just like ordinary driving cups, and can meet the drinking demand of common people. Moreover, the hard water pipe and the cup holder are designed creatively, which can help to solve the problem that it is not easy for bedridden patients to drink water.

The invention discloses a new modified phenolic resin and method for producing the same. An amount of polyether polyalcohol is added in the process of synthesizing a thermosetting phenolic resin at the molar ratio of formaldehyde to phenol being not less than 1 to obtain a polyalcohol-modified phenolic resin. The invention relates to a chemical modification for phenolic resin. The resin has lowerviscosity at the room temperature and good standing stability.

The invention provides an environment-friendly and safe waterborne polyurethane adhesive for synthetic leather and a preparation method thereof. The polyurethane adhesive is prepared mainly from the raw materials such as polytetrahydrofuran glycol, dicyclohexylmethylmethane diisocyanate, phosphoric acid, dimethylolpropionic acid, trimethylolpropane polyoxypropylene polyoxyethylene ether, isophorone diamine and deionized water. In a using process of the waterborne polyurethane adhesive for synthetic leather, the volatilized gas is water vapor which is harmless to environment, thereby greatly reducing the cost for controlling environmental pollution. The waterborne polyurethane adhesive for synthetic leather is insensitive to the environmental factors such as acid, alkali and electrolyte, and avoids the phenomenon of emulsion breaking caused by adding various auxiliaries; meanwhile, by adding a proper amount of carboxylic chain extender into the formula, the obtained waterborne polyurethane adhesive for synthetic leather has excellent performance such as high strength, high wear resistance, yellowing resistance, aging resistance, low-temperature resistance, folding resistance and good permeability.

The invention provides a medical oral dilator. The medical oral dilator comprises a second dilating block, a second supporting plate, a groove, a nut seat, a ball screw, a motor, an illuminating lamp and a gooseneck. The second dilating block is fixed to the lower end face of the second supporting plate which is mounted on the lower end face of the nut seat, the middle of the lower end face of an outer shell is provided with the groove, the nut seat is mounted on the ball screw which is mounted in the middle of the groove, the right end of the ball screw is connected with the motor which is mounted in the middle of the right end face of the outer shell, and accordingly a function of quick positioning of an oral dilating angle is realized, and operations of medical personnel are facilitated. The illuminating lamp is mounted on the lower end face of the gooseneck which is mounted on the front end face of a fixing seat, and accordingly a real-time illuminating angle adjustment function is realized, and examination efficiency of the medical personnel is improved. Therefore, the medical oral dilator has advantages of reasonable structure, functional completeness, convenience in operation, high practicality, high stability and high reliability.

The invention discloses a numerical control perforating machine for machining a distribution pipe. The numerical control perforating machine comprises a perforating table and a punch assembly, whereinan auxiliary platform is arranged on the perforating table, a supporting and clamping assembly and a rotating and clamping assembly are arranged on the auxiliary platform, the supporting and clampingassembly comprises a first limiting ring and a first guide sliding ring, the rotating and clamping assembly comprises a second limiting ring, a gear assembly and a second guide sliding ring, clampingpieces are arranged on the second limiting ring and the first limiting ring correspondingly, and supporting frames are arranged at the bottom of the second guide sliding ring and the bottom of the first guide sliding ring correspondingly. According to the numerical control perforating machine, aiming at perforating operation of a tubular object, the distribution pipe to be perforated is supported, lifted, clamped and fixed by adopting the supporting and clamping assembly and the rotating and clamping assembly, the placement stability of the distribution pipe is effectively guaranteed, the perforating precision is improved, and the rotating and clamping assembly can adjust the axial angle, so that the distribution pipe is driven to rotate synchronously, automatic perforating operation of the distribution pipe with different axial surfaces at multiple angles is achieved, and the working efficiency and the working quality are effectively improved.

The invention relates to instant modified cellulose cross-linked clean fracturing fluid. The instant modified cellulose cross-linked clean fracturing fluid consists of the following components in parts by weight: 0.2-0.6 part of FAG-500 type modified cellulose, 0.1-0.5 part of FAZ-1 type tackifying initiator, 0.3-0.7 part of DL-16 type discharge aiding agent, 0.5-1.2 parts of FAJ-305 type cross-linking regulator, 0.2-0.7 part of FAC-201 type polar chelate type organic zirconium cross-linking agent, 0.002-0.07 part of NBA-102 type encapsulated gel breaker and 100 parts of water. The invention further provides a preparation method of the instant modified cellulose cross-linked clean fracturing fluid. The instant modified cellulose cross-linked clean fracturing fluid provided by the invention has performance better than that of a normal fracturing fluid system, has the advantages of being instant, temperature-resistant, shearing-resistant, easy in glue breaking, free of residue, and environment-friendly, can be used for the low-permeability oil gas filed, particularly in fracture mining of an easily-damaged storage layer.

The invention relates to the technical field of new energy automobile sheet metal part machining accessory devices, in particular to a punching device of a novel energy automobile sheet metal part. Apunching head is capable of conveniently separating from the sheet metal part after punching is finished, and the practicability is improved; meanwhile, a plurality of groups of sheet metal parts canbe subjected to continuous punching operation by the punching device, and the use limitation is reduced; the placement stability of the sheet metal part is improved, the deviation is prevented, the position accuracy of a punching position is improved, and the use reliability is improved; the punching device comprise a supporting plate, a fixing plate, an operating plate, a hydraulic cylinder and punching plates; the punching device comprises an upper top plate, a lower top plate, four groups of supporting springs, two groups of left limiting guide columns, two groups of right limiting guide columns, two groups of left limiting guide sleeves and two groups of right limiting guide sleeves; and the punching device further comprises four groups of connecting rods, a rotating shaft, a steppingmotor, four groups of supporting rods and a bottom plate; and clamping devices comprises lead screws, nuts, pressing rods and rigid springs, and the bottom ends of the lead screws are connected with the top ends of punching rods, and mounting through holes penetrating up and down are longitudinally formed inside one sides of the pressing rods.

The invention discloses a starch-grafted waterborne polyurethane sand fixing agent and a preparation method thereof. The sand fixing agent is a starch-grafted waterborne polyurethane dispersion liquid of which the viscosity is 20-500 mPa.s at the temperature of 25 DEG C, the solid content is 30-45 percent by weight, the pH value is 6-8, and the storage stability is higher than six months; and the Shore hardness of a filmed dispersion liquid is 35-45. The sand fixing agent is obtained by undergoing a polymerization reaction on polyether polyol, diisocyanate, dimethylolpropionic acid, a neutralizing agent, starch, a latent solvent and a catalyst for forming a performed polymer and adding into deionized water for emulsifying. The starch-grafted waterborne polyurethane sand fixing agent has the advantages of degradability, nontoxicity, non-flammability, use safety, environmental friendliness, high nutrition and the like, and can be widely applied in the fields of agriculture and forestry as an environmentally-friendly nutritional sand fixing agent.

The invention discloses a new energy vehicle maintenance tool placement device in the technical field of new energy vehicle maintenance. The device comprises a toolbox body, the top of the toolbox body is provided with a toolbox cover, an inner cavity of the toolbox body is divided by a horizontally fixedly arranged installing partition plate into a storage cavity and a moving drive cavity, the bottom of the toolbox body is provided with an inner boss, a roller assembly, a switching connecting rod, a fixed collar, a switching compression spring, a lock nut and a bending drive rod, the middle of the storage cavity is horizontally provided with a loading carrier plate, the top of the loading carrier plate is provided with a sorting assembly, the left side wall of the storage cavity is provided with a polished rod mounting plate, a lifting polished rod and a lifting sliding sleeve, and the right side wall of the storage cavity is provided with a screw mounting plate, a lifting screw, a lifting nut seat, a lifting turbine, a lifting worm and a lifting rocker; the new energy vehicle maintenance tool placement device is convenient to take, place, move and park, and improves work efficiency.

The invention discloses an urban and rural planning layout display device. A motor is started, and four screw rod are driven to rotate synchronously by meshing action of a first gear and a second gear, so as to drive the sliding protrusion to move downward or upward. When the slide bump moves upward, the curved support bar moves upward. The overall height of the U-shape plate is lowered, the anti-skid pad is separated from the ground, the universal wheel is in contact with the ground, the display board can adjust the horizontal lay process by a rotary adjustment mechanism, thereby providing convenience for people to discuss and use the process, and the anti-skid pad is separated from the ground by a lifting adjustment mechanism, so that the universal wheel supports the whole device and isconvenient to move, and on the contrary, the placement stability is improved. The invention saves time and labor in the operation process, can be stored inside the lid frame, and can be placed in a window type to reduce dust falling into the lid frame, and can also store the viewed urban and rural planning map through a storage box, thereby reducing the possibility of damage, prolonging the storage time of display information, and prolonging the service life of the lid frame.

The invention relates to the technical field of navel orange planting auxiliary devices, in particular to a nutritional solution preparing and spraying device for navel orange planting. By means of the nutritional solution preparing and spraying device, much water can be conveniently carried, there is no need to manually mix or stir a configuration agent and water through a stirring bar, and laboris reduced; meanwhile, after the whole nutritional solution preparing and spraying device is moved to the position of a navel orange planting area, the overall placement stability is improved, and the use reliability is improved; there is no need to manually hold a spraying nozzle by hand and spraying a nutritional solution, navel orange trees at different heights can be conveniently sprayed, thespraying effect is improved, and the use limitation is reduced. The nutritional solution preparing and spraying device comprises a configuration box, a bottom plate, four wheels, four left supportingcolumns, four right supporting columns, a water tank, a stirring motor, an installing plate, a fixing plate, a supporting plate, a plurality of fixing anchors, four telescopic slide rods, four connecting springs, a threaded pipe, a threaded rod, a left hydraulic cylinder, a right hydraulic cylinder, a hydraulic station, a left adjusting plate, a right adjusting plate, a placement plate, a left spraying pipe, a right spraying pipe, an upper supporting column, a lower supporting column, an adjusting sleeve and a limiting square column.

The invention relates to the technical field of electronic product production auxiliary devices, in particular to an outer shell spraying device for notebook computer production; and the device can improve the placing stability of notebook computer outer shells on the inner wall of the bottom end of a working cavity to prevent shaking under the effect of external force, needs no operator to directly press by hands, improves the spraying effect and the use reliability, needs no operator to directly operate a pressure spraying gun to spray the surfaces of the notebook computer outer shells, relieves the manpower, and improves the practicability. The device comprises a spraying box, a placing plate and four sets of support legs. The device comprises a rotating disc, a rocking handle, a left rotating shaft, a right rotating shaft, a thread rod, a thread pipe, a left clamping plate and a right clamping plate. The device further comprises an adjusting lead screw, an adjusting hand wheel, anadjusting block, a left support plate, a right support plate, a driving motor, a support plate, a swing rod and an eccentric rod; a fixed groove is formed in the middle part of the upper side of the inner wall of the left end of a working cavity; an adjusting ball bearing is arranged in the fixed groove; and a thread through hole, penetrating left and right, is transversely arranged in the adjusting block.

The invention relates to a preparation method of a cation polyacrylate soap-free emulsion containing fluorine. The preparation method comprises following steps: dodecafluorhe-ptylacrylate or dodecafluoroheptyl methacrylate, N-alkyl diene propyl amine, and methyldiallylamine are mixed so as to obtain a mixed monomer A; oil soluble initiator azodiisobutyronitrile is added, an obtained mixture is heated to a certain temperature for polymerization, and a terpolymer is obtained; organic fluorine monomer and acrylate monomer are mixed so as to obtain a mixed monomer B; the terpolymer and water are added so as to obtain a monomer pre-emulsification liquid C; and water soluble initiator azobis(2-methylpropionamidine) dihydrochloride is added, and finished products are obtained via polymerization. The cation polyacrylate soap-free emulsion containing fluorine is a white emulsion; pH value ranges from 4.0 to 7.0; when the cation polyacrylate soap-free emulsion containing fluorine is mixed with water at a ratio of 9:1, no delamination is caused in 24 hours; and the cation polyacrylate soap-free emulsion containing fluorine possesses excellent storage stability, and can be stored at room temperature for 6 months without deterioration. The cation polyacrylate soap-free emulsion containing fluorine is capable of improving water resistance and oil resistance of paper or leather significantly.

The invention discloses a carpet cleaning machine, and the carpet cleaning machine comprises a handle assembly, a machine body assembly and a mop assembly, which are sequentially set from the top to the bottom. The mop assembly comprises a housing, a rolling brush and an exhaust fan, wherein the rolling brush and the exhaust fan are located in the housing. The lower side of the housing is providedwith a water sucking cavity, and an upper side of the housing is provided with a drain tank. The interior of the drain tank is provided with an incoming pipe and an air outgoing pipe, wherein the incoming pipe is communicated with the water sucking cavity, and the air outgoing pipe is communicated with the outer side of the drain tank. The interior of the incoming pipe is provided with a filtering device. The handle assembly comprises a handle pipe, and the handle pipe is provided with a triggering valve for controlling the communication quantity of a clean water tank and a water outgoing assembly. The machine body assembly at the tank mouth is provided with the clean water tank, and the mouth of the clean water tank is provided with a water outgoing valve. The clean water tank is connected with a water outgoing assembly through a pipe. The wall of the clean water tank is provided with a check valve. The carpet cleaning machine is advantageous in that the gravity center is low; the placement stability of the carpet cleaning machine is good; the operation convenience of the carpet cleaning machine is improved; the carpet cleaning machine is high in overall integration degree, is compact in structure, and is convenient to use; a triggering control position is located at the top of the handle, so the operation is convenient.

The invention discloses a bracket, and particularly relates to a cross clamp bracket of a tablet personal computer. The cross clamp bracket comprises a bracket seat, wherein the bracket seat is connected with a cross clamp; four end parts of the cross clamp are all connected with claws; and the claws can do telescopic motion back and forth opposite to the cross clamp. The technical defect that the tablet personal computers cannot be fixed by a fixing seat clamp of the conventional bracket is overcome; since the claws on the four end parts of the cross clamp can realize telescopic motion, the tablet personal computers or electronic readers of different sizes can be fixed; the height of the entire bracket during use is convenient to adjust; the placement stability of the entire bracket is high; meanwhile, not only the cross clamp can be adjusted in up-down direction and left-right direction but also adjustment of a rotation angle can be realized during use of the cross clamp bracket; and the cross clamp bracket has a rational integral structure and long service life.

The invention relates to the technical field of auxiliary devices for tablet personal computer production and detection, in particular to a key life test device for a tablet personal computer. The placement stability of the tablet personal computer on a test bed can be improved; the tablet personal computer can be fixed, and the use boundedness can be reduced; furthermore, a user does not need totest a start-up key of the tablet personal computer, so the labor intensity is relieved; and the test effect and the practicability are improved. The key life test device comprises the test bed, a rear side plate, a sliding plate, two groups of threaded rods, two groups of rollers, two groups of locking nuts, an upper left locking plate, a lower left locking plate, an upper right locking plate, alower right locking plate, two groups of left locking bolts, two groups of right locking bolts, an upper locking belt, a lower locking belt, a left screw rod, a right screw rod, an upper left fastening nut, a lower left fastening nut, an upper right fastening nut, a lower right fastening nut, an adjustment plate, four groups of supporting rods, a placement plate, a servo motor, a cam, a pulley, atest rod, four groups of reset springs and a limiting plate.

The invention relates to a novel long-acting sustained-release preparation and a preparation method thereof, in particular to a matrix sustained-release tablet with a controlled retardant layer and a preparation method thereof. The invention enables the matrix sustained-release tablet to be changed from the traditional single-layer tablet core structure to a double-layer structure including a drug containing layer and the controlled retardant layer by adding the controlled retardant layer to the structure of the traditional matrix sustained-release tablet, can also control the time of the retardant layer playing a retardant role by controlling the dissolving or corroding time of the retardant layer through predesign, very efficiently control the drug release and reduce the burst release and the late residuals, thereby obtaining excellent release effect.

The invention discloses a waterborne polyurethane sand-fixing agent and a preparation method thereof; the sand-fixing agent is inner crosslinking type waterborne polyurethane dispersion agent which contains neutralizer of kali salt of phosphoric acid and ammonium salt, wherein the solid content of the neutralizer is 30-45%, and the pH value of the neutralizer is 6-8. The preparation method comprises the following steps of: forming a prepolymer through the polymerization reaction of polyether polyol, diisocyanate, dihydromethyl propionic acid, the neutralizer, an inner crosslinking agent, a cosolvent and a catalytic agent, and then adding deionized water to the prepolymer for emulsification to obtain the sand-fixing agent. The waterborne polyurethane sand-fixing agent has the advantages ofwide suitable temperature range, non-toxicity, non-combustion, safety in use, free of environmental pollution and richness in nutrition and the like. As the environmental-friendly nutritional type sand-fixing agent, the waterborne polyurethane sand-fixing agent can be applied to the field of agriculture and forestry.

The invention discloses an angle-adjustable instant camera for a network visual English teaching device. The camera comprises a carrying platform and a camera body, wherein the bottom surface of the carrying platform is welded with a supporting leg; the surface of the supporting leg is welded with a triangular plate; the surface of the triangular plate is screwed with an adjusting screw rod; the bottom of adjusting screw rod is rotatably connected inside a first rotating groove; the first rotating groove is opened on the surface of a lifting plate; and the bottom surface of the lifting plate is bonded with a suction cup. The instant camera for angle-adjustable network visibility English teaching device uses a triangle support to improve the placement stability, arranges a lifting and dropping adjustable suction cup to improve the placement stability and avoids the camera inclining during the teaching process.