331results about How to "save material" patented technology

A plastic film having a thickness of less than 400 μm has a base layer at least partially of polyolefin of renewable raw material or a polyolefin mixture of renewable raw material and a first layer foamed by at least 20%.

In an information-processing apparatus which functions as a client terminal for an image-forming apparatus which functions as a scanner, a display unit displays a setting option screen for setting scanning conditions when requesting an image-forming apparatus to perform a scan processing. A selection unit performs automatic selection of an image-forming apparatus which is capable of performing the scan processing under the scanning conditions specified in the setting option screen. A control unit causes the image-forming apparatus chosen by the automatic selection of the selection unit, to perform the scan processing under the scanning conditions specified in the setting option screen.

An element, for example an element with a hollow body or a bolt element, in particular a nut element, for attachment to a plate-like component, has a ring-shaped recess or annular groove present at an end face of the element facing the component within a raised ring-shaped contact surface. At least one undercut is preferably provided in a side wall of the recess, and also features radial recesses and noses which extend into the ring recess providing security against rotation. A cylindrical punch section or pilot concentric to the central longitudinal axis of the element projects at the said end face within the ring-shaped recess and the outer boundary wall of the cylindrical punch section preferably has ring-shaped undercut. A material supply is formed at or adjacent to the free end face of the cylindrical punch section and is displaceable at least locally by means of a die button on insertion of the element into the ring-shaped recess in order to capture or clamp material of the component which has previously been deformed by the die button into the ring-shaped recess between itself and the base surface of the ring recess. In this way an improved security against rotation, an increased press-out resistance and an improved behavior against alternating loads in operation is achieved.

The invention relates to a three dimension (3D) printing method for a multilayer flexible circuit board. The method comprises a first step of offering a baseplate material and materials of a metal conductor, wherein the baseplate material comprises polyimide, dacron powder and acrylic ultraviolet (UV) invisible glue, and the materials of the metal conductor comprise copper powder, cobalt-chromium alloy powder, gold powder and silver powder; a second step of printing the multilayer flexible circuit board from the lowermost layer, wherein each layer is printed through slitting layer by layer in a specific direction according to a 3D computer-aided design (CAD) model, each layer is printed firstly in x axis direction and then in y axis direction, printing starts from the vertex of top left corner of the lowermost layer, and the whole multilayer circuit board is printed firstly in x axis direction, then y and finally z. The 3D printing method can rapidly prepare the integral multilayer flexible circuit board, is simple, uses few materials and has high precision; furthermore, the 3D printing method can help lower manufacture cost of enterprises, and can realize change from volume production of the flexible circuit board to customized production.

The invention relates to an anti-corrosion ink stirring device, and in particular, relates to the anti-corrosion ink high-efficiency stirring device for making an antenna. The technical problem to be solved by the invention comprise that provided is the anti-corrosion ink high-efficiency stirring device for making the antenna and with uniform stirring and simple structure. For solving the technical problem, the anti-corrosion ink high-efficiency stirring device for making the antenna is provided and comprises a bottom board, a left frame, a right frame, a heating device, a stirring box, a screen plate, a first slide rail, a first sliding block, a first rack, a first bearing seat, a first rotating shaft and the like; the left frame is located at the left side of the right frame, a top plate is arranged at the upper ends of the left frame and the right frame, the top plate is provided with a material dropping hopper, and the right side of the left frame is successively provided with the heating device, the stirring box and a first spring from top to bottom successively. Through the first motor, a stirring rod is driven to rotate, with rotation of the second motor, a straight plate is driven to move left and right and first stirring blades are driven to rotate, and a liquid in the mixing box is mixed and stirred.

The invention discloses a multi-row type omnidirectional wheel. The multi-row type omnidirectional wheel comprises hubs and driven wheels, wherein the hubs are arranged in a manner of two or more rows inside and outside and are alternately staggered at an angle of 22.5 degrees to ensure that at least one small wheel of the omnidirectional wheel is in contact with the ground surface. An outer hub bracket and an inner hub bracket are directly matched and connected through a hub center. A support shaft is mounted in a U-shaped groove of each hub; each two support shafts are connected with each other to form a regular octagonal shaft chain; each support shaft is provided with a spindle body driven wheel; and the joints of the shaft chains are fixed through cover plates with barbs. Each driven wheel adopts an integral structure of vulcanizing each bearing sleeve and rubber at the outer ring of each spindle body, so that motion precision of the omnidirectional wheel is guaranteed. According to the invention, insertion type structures are designed on the inner hubs and the outer hubs, so that multi-row parallel installation can be realized, bearing capability of the omnidirectional wheel is improved efficiently. The multi-row type omnidirectional wheel, disclosed by the invention, has the advantages of overcoming the defect of an overlarge gap between adjacent small wheels of the traditional omnidirectional wheel, improving driving smoothness of driving wheels and guaranteeing vibration precision of a robot at runtime.

The invention relates to a Micro USB (universal serial bus) receptacle, which comprises a PCB (printed circuit board) and an outer casing. The receptacle is characterized in that a convex block extends outwards from the side edge of the PCB, the surface of the convex block is provided with a copper coil which is connected with a PCB circuit, the interior of the outer casing is provided with a through hole, the convex block is inserted into the through hole of the outer casing to form a connecting core of the USB receptacle, and the bottom of the convex block is provided with a sealing piece which is used for sealing the opening of the through hole. The micro USB receptacle has the beneficial effects that 1. the PCB is provided with a matrix, so the material is saved, the production process is simplified, and the production cost is reduced; 2. the outer casing adopts a plastic outer casing, so the interference effect on antennas by hardware is improved, and the manufacturing cost is reduced; 3. a sealant is adopted for sealing the opening of the outer casing, so the waterproof and dustproof functions are favorably realized; 4. as the outer casing is made of plastic material, the matching degree is higher when the outer casing is assembled on an object or is arranged in a mounting hole, the gap is smaller, and the dustproof purpose is favorably realized.

The invention relates to a method for synthesizing 3-methyl-3-butene-1-ol by using formaldehyde hemiacetal. The method comprises the following steps: pressurizing the formaldehyde hemiacetal to 12-18MPa under continuous operation conditions, and preheating to the temperature to 280 to 350 DEG C, wherein a supercritical state of the formaldehyde hemiacetal is reached; and rapidly mixing the formaldehyde hemiacetal with supercritical isobutene under the same pressure and temperature, and carrying out a supercritical reaction in a tubular reactor for 0.5-5 minutes. The reaction solution is cooled under reduced pressure and is detected after the isobutene is recovered, the conversion rate of the formaldehyde hemiacetal can be over 98 percent, and the selectivity of the 3-methyl-3-butene-1-ol can be over 98 percent. The reaction can be carried out under the supercritical conditions, the method has the advantages that the reaction time is obviously shortened, the reaction efficiency is greatly improved, byproducts are obviously reduced, and the method is green, environment-friendly, low in cost and suitable for industrial application.

The invention discloses a powder metallurgy start chainwheel and gear. The chainwheel and gear are pressed and formed at a time by the powder metallurgy process, and comprise the following raw materials in percentage by weight: 95.5-98% of iron, 0.3-1.2% of carbon, 0.7-2% of copper, 0.1-0.5% of manganese sulfide and 0.3-1.2% of zinc stearate. In the invention, the traditional manufacturing process is replaced by the powder metallurgy technology so as to save cost for the traditional enterprises. The powder metallurgy has high degree of mechanization, saves materials, lowers cost, reduces manpower and material resources and improves efficiency and tooth profile accuracy.

In a cold rolling method for producing annular composite workpieces, at least two hollow cylindrical workpieces made of different materials are inserted into one another. The at least two hollow cylindrical workpieces are roll formed by pressing the at least two hollow cylindrical workpieces against each other between two diametrically opposed external roll forming tools and an internal rolling arbor or between two diametrically opposed external roll forming tools and an internal roll forming tool to form a composite workpiece. The composite workpiece is a bearing ring or a gear ring. One of the hollow cylindrical workpieces can be a nonferrous material such as aluminum.

The invention discloses a washing machine. The washing machine comprises: a base, a washing bucket, a driving part, a heating device, a water inlet pipe and a water discharging pipe, wherein the washing bucket is rotatably arranged on the base around a horizontal rotary central shaft; a washing cavity is defined in the washing bucket; one end of the water inlet pipe stretches into the washing cavity and the other end of the water inlet pipe stretches out of the washing cavity; one end of the water discharging pipe stretches into the washing cavity and the other end of the water discharging pipe stretches out of the washing cavity; the water inlet pipe and the water discharging pipe are connected with the base in a relatively fixed manner; an output shaft of the driving part is connected with the washing bucket in a relatively fixed manner; the driving part is used for driving the washing bucket to rotate; the heating device is arranged in the washing bucket; the heating device is used for heating water in the washing bucket. According to the washing machine provided by the invention, single-bucket washing can be realized, materials are saved, the water is saved and the cost is reduced; a condition that dirt is remained in the washing bucket can also be avoided and bacterium breeding is avoided, so that the environment of the washing machine is cleaner. Furthermore, the heating device is arranged so that hot water washing can be realized and the washing effect is improved.

The invention relates to a pressing device, in particular to an efficient mosaic tile pressing device. The technical problem is solved by providing the efficient mosaic tile pressing device with high pressing efficiency. In order to solve the technical problem, the invention provides the efficient mosaic tile pressing device. The efficient mosaic tile pressing device comprises a bottom plate, a pressing box, a supporting plate, a first cylinder, a placing platform, a supporting rod, a rack, a gear, a lifting rod, a guide sleeve, a pushing block, a first motor, an elliptical cam, a small belt pulley, a first rotating shaft, a second motor, a big belt pulley, a flat belt and the like; the supporting rod, the pressing box and a right support are sequentially arranged at the top of the bottom plate from the left side to the right side; the placing platform is arranged at the top end of the supporting rod. The high-efficiency mosaic tile pressing device achieves the effect of high pressing efficiency; due to arrangement of the second motor and the first motor, the second motor and the first motor drive a first pressing block and a placing plate to press powder at the same time.

The invention provides an elevator compensation rope tensioning device which comprises guide rails respectively and perpendicularly arranged on two sides of an elevator well pit and guide supports. A left wheel installation plate and a right wheel installation plate are symmetrically arranged between the two guide rails, the external outlines of the left wheel installation plate and the right wheel installation plate are in C shapes, the left wheel installation plate and the right wheel installation plate bypass a compensation rope, guide shoes are arranged on the outer side of the left wheel installation plate and the outer side of the right wheel installation plate corresponding to the guide rails, a horizontally-arranged left compensation wheel and a horizontally-arranged right compensation wheel are respectively fixed between two support legs, thread sleeves are fixed at the outer ends of the support legs, horizontally-arranged double-head telescopic screws matched with the thread sleeves to act are respectively arranged between the two thread sleeves on the same side of the left wheel installation plate and the same side of the right wheel installation plate, threads at two ends of the each double-head telescopic screw are opposite, the guide supports are respectively parallel to the double-head telescopic screws, one end of each extension spring is sleeved on the outer wall of the guide support, and the other end of each extension spring is connected with the support leg of the installation plate at the corresponding position or a connection shaft of the compensation wheel.

The invention discloses a lifting drive system of a parking device and belongs to the technical field of parking devices. Two steel wire ropes drive upper-layer sweeping boards and lower-layer sweeping boards to move up and down, and one steel wire rope installed on a winding drum is wound around a three-direction pulley block, corresponding fixed pulleys on upper-layer sweeping boards, the three-connection pulley block and corresponding fixed pulleys on underground sweeping boards sequentially and then is fixedly installed on a back cross beam of a top floor; the other installed on the winding drum is wound around the three-connection pulley block, a two-connection pulley block, corresponding fixed pulleys on the upper-layer sweeping boards, the two-connection pulley block and corresponding fixed pulleys on underground sweeping boards sequentially and then is fixedly installed on the back cross beam of the top floor; and balance chains are arranged on two sides of the upper-layer sweeping boards and the lower-layer sweeping boards respectively. The invention further discloses a two-forward one-negative lift-sliding parking device. The lift-sliding parking device comprises a plurality of lifting drive systems of the parking device. According to the lifting drive system and the lift-sliding parking device, upper-layer sweeping boards and the underground sweeping boards are integrated into one lifting drive system, so that 50% of lifting system materials are saved, and manufacturing costs are reduced.

The invention discloses an asphalt pavement prefabricated block and a construction method for a prefabricated asphalt pavement. The asphalt pavement prefabricated block is characterized by comprising a base plate (1), an adhesive layer (2) on the plate and an asphalt surface layer (3) from bottom to top; and the asphalt pavement prefabricated block is cuboid, one side length of the bottom is 5 to 20 meters, and the other side length of the bottom is 1 to 20 meters. The asphalt bottom is reinforced by adopting the base plate which has a thermal expansion coefficient close to those of cement concrete and a steel plate and is made of fiber reinforced composite material, so that the fatigue resistance and the reflection crack resistance of the asphalt surface layer are improved; rainwater is effectively prevented from seeping from the asphalt surface layer to corrode a lower bearing layer; and through the prefabricated block, the rigidity of a steel bridge floor can be improved, and particularly the steel bridge floor with insufficient steel plate thickness can be reinforced, so that the thickness of the asphalt surface layer is reduced, and damage such as cracking, falling and the like of the asphalt paved layer due to insufficient rigidity of the steel bridge floor is avoided.

The invention discloses a novel electric truck chassis structure which comprises a front axle, a rear axle, a motor, a truss type truck frame which is fixedly erected on the front axle and the rear axle, and power batteries contained inside the truck frame. The truck frame sequentially comprises a front frame body erected on the front axle, a middle frame body of a double-layer structure, and a tail frame body erected on the rear axle. The front frame body is provided with a first containing space used for containing the power batteries. The middle frame body comprises a plurality of second containing spaces which are penetrating in the left-right direction and a plurality of cross beams used for forming the second containing spaces. The length of each first cross beam is larger than the sum of the lengths of the two power batteries. The motor is fixed to the tail portion of the tail frame body. The power batteries are contained in the first containing space and the second containing spaces. The novel electric truck chassis structure is high in space utilization rate, large in battery capacity, and good in safety anti-collision resistance.

The invention discloses a manufacturing method of a large-scale and high-intensity rivet connection pair. The manufacturing method comprises the followings steps: carrying out temperature heading to a rivet material to form a rivet blank with a rivet head and a rod body; carrying out quenching and tempering heat treatments to the rivet blank in sequence; then processing the rivet blank through finish turning and grinding, so as to form a locking slot pitch diameter region and a pulling slot pitch diameter region on the rod body; carrying out cold rolling to the pitch diameter regions, so as to form a plurality of locking slots not communicated with a ring slot, and a plurality of pulling slots not communicated with the ring slot; finishing a guiding slot; finishing a breakage slot and preparing a rivet; carrying out temperature heading to a rivet sleeve material so as to form a rivet sleeve blank with a hollow revolving body; carrying out normal fire heat treatment to the rivet sleeve blank; finishing the rivet sleeve blank to be a standard rivet sleeve or a flange rivet sleeve; pressing to make a flange so as to make a rivet sleeve. The diameter of the rivet provided by the invention ranges from 30mm to 64mm, the inner diameter of the rivet sleeve is larger than the outer diameter of a rivet locking slot by 0.5mm to 2mm, and the rivet is particularly suitable for large-scale heavy-duty mechanical shock resistance and looseness prevention. The manufacturing method provided by the invention has the advantages that the process is simple, the cost is relatively low, the bearing capability is relatively strong, and shock resistance and looseness prevention are safer and more reliable than that of bolted connection.

The invention relates to a hoisting construction structure for an air corridor ceiling. The hoisting construction structure is used for exterior decoration of the bottom of an air corridor main structure and comprises unit plates. The top of each unit plate is connected with a hoisting mechanism enabling the unit plate to ascend and descend, and the bottom of each unit plate is connected with an anti-swing mechanism preventing the unit plate from swinging around. According to the hoisting construction structure, the ceiling is machined into the unit plates on the ground, steel wire ropes of electric winches penetrate through a gap of an air corridor floor or a steel structure to directly hoist the ceiling unit plates, the ceiling unit plates are located at a preset position on the lower portion of the air corridor floor and fixed to the ceiling position, and the unit plates are hoisted in place one by one in a horizontal segment mode till construction of the complete ceiling is completed. A traditional construction technology with an all-round scaffold or a track type hoisting boat or a basket used is omitted, the ceiling installation work is effectively simplified, the construction period is greatly shortened, no large hoisting equipment is needed, construction is not limited by the height of an air corridor, and the economic benefits, progress and quality of construction are greatly improved.

The invention relates to a binding film for leakage detection of sulfur hexafluoride electric equipment, which comprises a plastic layer, a double-sided sticky tape and a plastic film. The binding film for leakage detection of sulfur hexafluoride electric equipment is characterized in that cylindrical plastic bodies are uniformly distributed and vertically prepared on an upper plane of the plastic layer at intervals; the double-sided sticky tape is spliced and fixedly arranged on the lower plane of the plastic layer; and the plastic film is spliced and fixed with the lower plane of the double-sided sticky tape. After the binding film provided by the invention is bound, a regular geometrical shape is formed; a clearance between the binding film and a detected part is a fixed value; and a binding cavity volume and a yearly air leakage rate of an air chamber are accurately calculated, so that the leakage condition of the air chamber is accurately judged and the unnecessary power-off overhaul caused by misjudgment and the unscheduled power outage caused by accident air leakage of the air chamber are avoided. The binding film provided by the invention has the advantages of low cost of raw materials, convenience in use and obvious economic and social benefits.

The invention relates to a method for forging a step shaft with electroslag ingots. The method is suitable for forging the step shaft with large step diameter. A dead head end of an electroslag ingot is disposed on a upsetting drain cap for upsetting. The upset dead head end of the electroslag ingot forms a drum-shaped convex face and is elongated, due to the fact that the dead head end is the drum-shaped convex face, the dead head end is less prone to sinking, only a small part of dead head end needs to be cut off at last, pliers handle pressing with a hydraulic press in the original method is omitted, and the method has the advantages that the method is material-saving, utilization rate of forged piece is improved, and production cost is lowered.

The invention discloses a revolving-scraper type biomass pyrolysis reactor, which belongs to the field of biomass pyrolysis equipment. The revolving-scraper type biomass pyrolysis reactor comprises a heating cylinder, a revolving drum, a temperature control instrument, a dynamic seal, a bearing, a spray header, a hopper, a charging threaded rod, a charging motor, a circulating pump, a recirculated cooling liquid pipeline and an oil-water collecting cylinder, wherein the revolving drum is composed of a revolving shaft, a revolving-shaft through hole, a through hole of an external cylinder of the revolving drum, a revolving scraper, heat insulation cotton, a fixed wing and the external cylinder of the revolving drum. By using the reactor disclosed by the invention, the integration of a pyrolysis device, a cyclone separation device and a scrubbing-condensing device is truly realized; just through changing the preset temperature of the temperature control instrument and the revolving speeds of a revolving drum speed regulating motor and a charging speed regulating motor, the productivities of three products comprising biological oil, combustible gas and biomass carbon can be adjusted; and compared with the existing biomass pyrolysis reactor, the pyrolysis temperature is reduced by 100-150 DEG C.

The invention provides a connection joint of a concrete filled steel tubular column and enclosed U-shaped steel concrete composite beam; in order to save materials and solve the problem that since a connection plate at the connection part of a composite beam bottom plate and a steel pipe outwards extends, an indoor corner has a convex angle to influence the beautiful sense, an inner partition plate is arranged at a position corresponding to a U-shaped steel bottom plate in the steel pipe, and the periphery of the inner partition plate is welded with the inner wall of the steel pipe. Sleeves which are movably connected with the end parts of hogging moment reinforcing steel bars are correspondingly arranged at two relative ends in the steel pipe along the length direction of the composite beam respectively; and the sleeves are welded with the outer wall of the steel pipe. The joint is capable of relieving the condition that the bearing capacity of the steel pipe is weakened due to hole forming in the side wall of the steel pipe; the welding workload is reduced; construction is facilitated; and assembly is realized. In order to effectively transmit a load, a horizontal stiffening plate is fixedly welded at positions corresponding to the sleeves in an inner cavity of the steel pipe, and the welding workload in field is reduced; a U-shaped steel side plate is connected with the wall of the steel pipe by adopting high-strength bolts through connection plates; the connection plates are connected with the wall of the steel pipe by angle welding; and welding is completed in a factory.

The invention belongs to the technical field of shaft pin manufacture, relates to shaft pin manufacture equipment, in particular to a chain pin shaft machine which solves the technical problems that the prior art is not reasonable enough, and the like. A drive shaft horizontally arranged and capable of rotating in the circumferential direction is arranged on a working platform; a first driving assembly and a second driving assembly distributed in the axial direction of the drive shaft are arranged on the drive shaft; the first driving assembly is connected with a truncating mechanism and can drive the truncating mechanism to operate; the second driving assembly is connected with a feeding mechanism and can drive the feeding mechanism to operate; when the drive shaft rotates, the feeding mechanism and the truncating mechanism can operate alternately; the truncating mechanism is positioned on one side of the feeding mechanism, and can receive stripe materials input by the feeding mechanism and truncate the stripe materials into pin shafts. Compared with the prior art, the pin shaft machine has the advantages as fellows: 1, the design is reasonable, the structure is simple, and the working efficiency is high; 2, the automation degree is high, and the labor intensity of workers is reduced.

The invention discloses a variable diameter plastic sleeve mixed pile for reinforcing a thick-covering and deep-burying soft soil layer and a piling reinforcing method. The upper part of a mixed pile body in a thick covering is filled with a scattered material by a small-diameter sleeve to form granular piles of an upright draining body, the lower part of the pile body in the soft soil layer is filled with the scattered material by a large-diameter sleeve and grouted to form a rigid pile with a grouted scattered material pile body, the large sleeve and the small sleeve are connected by a variable diameter joint, the lower part of the large sleeve is connected with a pile tip, the wall of the sleeve is provided with an opening hole and wrapped with geotextile, and a grout scattering area is formed at the periphery of the pile body. The pile-forming reinforcing method comprises: measuring the depth of the soft soil layer at the covering layer, preparing the lengths of the large sleeve and the small sleeve, connecting the lower part of the large sleeve with the pile tip, beating the large sleeve to the pile depth by a beating machine, leaving the sleeve and the pile tip in the foundation, filling the scattered material in the large sleeve, then grouting the large sleeve to form a fixed pile body, and forming the grout scattering area or a gourd pile body at the periphery of the pile. The mixed pile has a reasonable structure, is economic and practical, effectively improves the performance of the soil around the pile, and improves the bearing performance of the pile body.

The invention discloses a preparation method of tauro ursodesoxy cholic acid. The method comprises the following steps: firstly, dissolving ursodesoxycholic acid in organic solvent, reducing the temperature of the ursodesoxycholic acid to 0 to 10 DEG C, adding amine compounds into the ursodesoxycholic acid, and stirring the ursodesoxycholic acid; secondly, adding condensing agent and 4-dimethylamino pyridine after stirring in the first step, and performing stirring reaction at room temperature, obtaining reaction liquid A; thirdly, adding the reaction liquid A obtained in the second step into sodium taurocholate salt water solution, and dropwise adding triethylamine at room temperature while stirring so as to ensure that the triethylamine is reacted with the reaction liquid A; and fourthly, adding methylene dichloride to perform extraction and liquid separation after the reaction in the third step, then washing a water layer through methylene dichloride, adjusting the pH value after washing, performing concentration after stirring, and then obtaining the tauro ursodesoxy cholic acid. The preparation method has the advantages that the tauro ursodesoxy cholic acid is prepared through a novel technical process, the reaction speed is high, the product quality is high, and raw material is cheap.

An integrated motor driver system integrating a motor and a controller is used for a separation structure, which requires large installation space and is heavy in weight and high in cost, of an existing driver and a permanent magnet synchronous motor, an existing permanent magnet synchronous motor integrated structure has defects of low output power, cooling difficulty and the like. The integrated motor driver system comprises an enclosure assembly, a stator assembly, a rotor assembly, a rear end cover assembly, a rear shell, a rear cover, a control plate and a driving plate. Since the controller and the motor adopt an axial series structure, a connection part between the controller and the motor is greatly reduced, and the integrated motor driver system has the advantages of small size, light weight and the like. A cooling boss is milled on the rear shell of the system, a power tube of the controller is pasted on the cooling boss by a double-sided cooling adhesive, the power tube is tightly pressed by an L-shaped press plate and fixed on the cooling boss, cooling of the power tube of a driver is achieved by the rear shell, and the integrated motor driver system has the advantages of high heat dissipation and the like.

The invention relates to a CFB boiler membrane-wall grid anti-wear alloy plate and effectively solves the problems of the prior art. According to the technical scheme, the anti-wear alloy plate comprises an alloy plate body, a first concave arc transition is arranged between one side and bottom of the alloy plate body, a second concave arc transition is arranged between the other side and bottom of the alloy plate body, the sum of angles of the first arc transition and second arc transition is no less than 180 degrees, and one or multiple inner grooves corresponding to the membrane-wall pipe in diameters are formed in the bottom of the alloy plate body between the first arc transition and second arc transition. The alloy plate is tighter in protection, material is saved, construction is facilitated, efficiency is improved, welding is firmer, and controllability is high.

The invention aims to overcome the defect that the large-aperture PVC pipe is difficult to produce in the prior art and provides a dynamic forming method and device for a large-diameter PVC pipe. The forming device comprises an extruder, a baking oven, an ultrasonic welding device and a large-diameter roller mould. Plasticizing extrusion is performed on PVC special materials by an extruder, the PVC special materials are transferred through a conveying belt, and are heated again through the baking oven on the conveying belt, meanwhile, a motor pulls the materials at a high speed, so as to enable the materials to be oriented in the extrusion direction, finally, the materials are wound on the surface of the large-diameter roller mould, the mould rotates while performs rectilinear motion forwards, the component force for mould performing rectilinear motion enables the materials to be oriented in the axial direction of the mould, the gapes among materials are welded and sewed through the ultrasonic welding device, a cylindrical welding head is pressed on the PVC material and rotates together with the mould, so that synchronous extrusion winding and welding are achieved, and the cycle is shortened greatly due to continuous production. The mould is shrinkable, the demoulding is convenient, and when the PVC-O pipe with the diameter of 2,000 or even larger is produced, all that is needed is to replace the roller mould with larger diameter.

The invention discloses an air purification device adopting plasma discharge combined with a modified molecular sieve and a using method thereof. The device comprises a filter screen module, a plasma purification device, a humidification pressurization device and a detection display control module. A gas outlet of the filter screen module is connected with a gas inlet of the humidification pressurization device, another gas outlet is connected with a dry air inlet of the plasma purification device, and a gas outlet of the humidification pressurization device is connected with a wet air inlet of the plasma purification device. According to the method, air is filtered through the filter screen module to be respectively sent to the plasma purification device and the humidification pressurization device; the air enters a humidification water tank to undergo water atomization through an ultrasonic nebulizer and then is sent to a wet air leading-in pipe of the plasma purification device; and the air entering the plasma purification device is purified through corona discharge. According to the air purification device and the using method, the W type plasma purification device is adopted to be favorable for prolonging reaction time and solve the problem of squeal; dry and wet air separation is adopted to promote gas mixing, and the VOC pollutant clearance rate is high.

The invention discloses an UHPC small box girder structure. The UHPC small box girder structure comprises multiple box girder bodies connected with each other through longitudinal joints; the box girder bodies are prefabricated by ultra-high performance concrete; the box girder bodies consist of top plates, bottom plates, web plates, midspan diaphragms and end diaphragms; retard-bonded prestressedtendons are embedded in the box girder bodies in a longitudinal direction; internal side templates and external side templates which are fixedly connected with each other through bolt connecting pieces are arranged in the end parts of the box girder bodies; the end diaphragms are integrally poured between the internal side templates and the external side templates; and the box girder bodies are thin-walled box girders consisting of UHPC materials. Materials are effectively saved, the girder weight is reduced by about 40%, the retard-bonded prestressed tendons are embedded in the box girder bodies so that the materials are saved and the girder height is reduced; corrosion and changing problems of external prestressed tendons are avoided; and the maintenance cost in the operation period isgreatly reduced.