219results about How to "Avoid punching" patented technology

The invention discloses a perforating device suitable for steel tubes with different diameters. The perforating device comprises a base, a clamping device and rolling adjustment devices symmetrically arranged on the front and back sides of the clamping device are arranged at the end face of the top of the base, and a perforating rack is arranged at the position, between the clamping device and the back rolling adjustment device, of the base; a first rolling groove and a second rolling groove which are arranged in a bilateral symmetry manner are arranged in each rolling adjustment device, a separating plate is arranged between each first rolling groove and the corresponding second rolling groove, the first rolling grooves and the second rolling grooves are each internally provided with a bearing piece, and the bearing pieces on the left and right sides are each internally provided with rollers with taper face sides oppositely arranged; a lifting sliding cavity is arranged in the clamping device in a manner of being communicated with the base at the bottom of the clamping device, and a lifting sliding piece is arranged in the lifting sliding cavity; and through grooves are symmetrically arranged on the left and right sides of the top of the clamping device, and a driving sliding cavity is arranged in the lifting sliding piece. The perforating device is simple in structure and convenient to operate, and the perforating accuracy and stability are improved.

The invention discloses a preparation method of metformin hydrochloride. The preparation method is characterized by using dicyandiamide and dimethylamine hydrochloride as raw materials, feeding the materials in a mole ratio of (1:1)-(1:1.2), using N,N-dimethylacetamide or dimethyl sulfoxide 2-4 times dicyandiamide by weight as a solvent, and reacting for 4-8 hours at 140+/-5 DEG C to prepare a crude metformin hydrochloride product; recrystallizing the crude product with ethanol, regulating the pH value to be 5-6, decoloring the crystal, cooling the crystal to minus 10-0 DEG C while stirring, precipitating the crystal, obtaining a refined metformin hydrochloride product through filtering and drying, and recovering the solvent from filtrate. The qualified product has yield of 80-85% and high purity. The preparation method has the advantages that as the selected reaction solvent has a relatively high boiling point, the recovery rate of the solvent is high; the phenomenon of material surging can be effectively avoided, so that the preparation method has the advantages of mild reaction conditions, simplicity in operation and high safety.

The invention discloses an assembly structure of a prefabricated concrete beam and a concrete-filled steel tube column. The assembly structure comprises the concrete-filled steel tube column, a concrete-filled steel tube bracket, the prefabricated concrete beam, beam end pre-buried steel and a connection plate, wherein the concrete-filled steel tube bracket is welded with a side part of the concrete-filled steel tube column; the concrete-filled steel tube bracket is step-shaped; the concrete-filled steel tube bracket comprises bracket-shaped steel and bracket concrete filled in the bracket-shaped steel; a plurality of opposite-pull bolt holes are formed in the side surface of the bracket-shaped steel; the prefabricated concrete beam comprises the beam end pre-buried steel and prefabricated reinforced concrete; the beam end pre-buried steel is step-shaped and is matched with the shape of the concrete-filled steel tube bracket; a plurality of opposite-pull bolt holes are also formed in the side surface of the beam end pre-buried steel; the connection plate is arranged on the side surface of the bracket-shaped steel and the beam end pre-buried steel and is locked and fastened by a plurality of opposite-pull bolts. The assembly structure of the prefabricated concrete beam and the concrete-filled steel tube column is high in bearing capacity, high in earthquake-resistant ductility, high in node energy dissipation capacity, convenient to construct and high in construction quality, and can provide effective restraint on the concrete.

The invention relates to the field of building structures, in particular to a structural steel-steel bar combined structure, a manufacturing method and a structural steel concrete structure. The structural steel-steel bar combined structure comprises structural steel, a plurality of tie bars and a plurality of connecting pieces. The structural steel comprises webs and frange plates which are located at the two ends of the webs and perpendicularly intersect with the webs. One side of each connecting piece is fixedly connected with the corresponding web. The first end of each tie bar is fixedly connected to the corresponding connecting piece, and a second end opposite to the first end is a free end. According to the structural steel-steel bar combined structure, the manufacturing method and the structural steel concrete structure, the connecting pieces used for fixing the tie bars are specially arranged in the positions, corresponding to the tie bars, of the two sides of the structural steel webs, thus, no hole needs to be drilled in the structural steel webs, the effect that the overall structure of the structural steel is not damaged is guaranteed, and accordingly the overall strength of the structural steel concrete structure is guaranteed.

The invention relates to the field of stamping dies, in particular to a stamping head lubricating mechanism. The stamping head lubricating mechanism comprises a base, a stamping structure, a lubricating structure, a guide structure, a feeding structure, a cleaning structure and a pressing structure. Through the arrangement of the stamping structure, long sheet materials can be stamped into required round parts one by one, the lubricating structure can be synchronously driven to work while the stamping structure carries out stamping work, and through work of the lubricating structure, oil injection lubrication work can be automatically carried out on assemblies in the stamping structure during stamping, so that the friction force between the stamping assembly and the sheet materials can bereduced, the situation that burrs appear on the periphery of a stamped finished product part can be avoided, and thus the effect of greatly improving the production quality is achieved; and the cleaning structure can be synchronously driven to work while the feeding structure works, dust and chippings on the metal sheet materials to be punched can be blown off, and therefore the dust and the impurities can be prevented from being punched along with the metal sheet materials.

The invention discloses an equipment system for industrially producing a Grignard reagent by using gaseous halogenated hydrocarbon, comprising a raw material feeding system and two reaction kettles, wherein a shell of each reaction kettle is provided with an observation window and a pressure gage; each reaction kettle is internally provided with a mixing propeller; a tetrahydrofuran or ether storage and absorption tank and a gaseous halogenated hydrocarbon pressure storage tank in the raw material feeding system are respectively connected with the two reaction kettles through a three-way valve; a magnesium feeding cabin is independently connected with the reaction kettles through a rapidly opened flange; and the two reaction kettles are same in structure and are connected in series through two gas-guide tubes. The two serially connected reaction kettles are adopted in the invention, the reaction in the two reaction kettles are simultaneously carried out, gaseous halogenated hydrocarbon is introduced to one of the reaction kettles, and unreacted halogenated hydrocarbon enters the other reaction kettle for continuous reaction to realize the reaction under the pressure near the normal pressure and the recovery of the halogenated hydrocarbon, thereby realizing the clean production of the Grignard reagent.

The invention provides an electron beam fusing additive blank manufacturing and ring-rolling forming method for a large-size metal annular piece. According to the method, a precision ring-rolling technology and an electron beam fusing additive manufacturing technology are combined, a roller is used for rolling an electron beam additive manufactured blank for deformation, and thus precise and rapidforming of the high-performance annular piece is achieved. The prepared large-size metal annular piece has a fine and uniform deformed structure, the defects of an as-cast structure, pores, non-fusion and the like of an electron beam fusing additive manufactured blank part are eliminated, residual stress and distribution in the part are reduced and improved correspondingly, and stability and reliability of performance of the large-size metal annular piece prepared through electron beam additive manufacturing in the using process are remarkably improved. Meanwhile, by means of the method, forming procedures of the annular piece are greatly reduced, production efficiency is improved, and the production cost of the part is lowered.

The invention provides uracil heating synthesis method. The method comprises the following step that materials including oleum containing sulfur trioxide with the mass percent being 8 to 12 percent, urea and malic acid are proportioned according to the mass ratio of (30 to 40):(1 to 5):(3 to 7); under the stirring condition, the urea is firstly added into the oleum; then, the malic acid is added into the oleum to obtain a mixed material; the mixed material is subjected to microwave heating, so that the mixed material is subjected to condensation reaction at the temperature of 85 to 90 DEG C; acondensation material is obtained; the condensation material is mixed with water; filtering is performed to obtain a uracil crude product. The heating synthesis method provided by the invention has the advantages that the steps are simple; the consumed time is short; the yield of the produced uracil product is high; the production cost is low; the pollution is reduced.

The embodiment of the invention relates to the communication field and discloses an attendance clock-in method and an attendance machine. The attendance clock-in method is applied to the attendance machine. N bluetooth identification numbers are prestored in the attendance machine, wherein N is a natural number which is greater than or equal to 1. The method comprises the following steps: searching for bluetooth broadcast, and extracting a bluetooth identification number in the searched bluetooth broadcast; comparing the extracted bluetooth identification number and the prestored N bluetooth identification numbers; and sending a first notification message to a correspondingly connected server, and sending a clock-in prompt message to a user terminal for the server, wherein the first notification message comprises identifying information of the user terminal; and receiving a clock-in message of the user. Clock-in congestion caused by a traditional attendance machine is avoided, and clock-in efficiency is raised. By actively reminding a user of clock-in, the user is avoided from forgetting to clock-in.

The invention relates to an integrated roof power generation system of a building. The system is composed of a main water tank, photovoltaic assemblies, pressing blocks and cushion blocks. The main water tank consists of a main supporting part, auxiliary supporting parts and drainage channels; the two side walls of the main supporting part protrude outwardly to form inverted buckles; chutes are formed at parts, corresponding to the inverted buckles, in the two side walls of the main supporting part; the inverted buckles are connected with photovoltaic assembly fixed elements in a buckling manner; the cushion blocks are arranged on the photovoltaic assembly fixed elements cooperatively; and the bottoms of the cushion blocks are in contact with the main supporting part and the photovoltaic assemblies are arranged at the two sides of the cushion blocks. The pressing blocks are pressed between the photovoltaic assemblies and are fixed with the photovoltaic assembly fixed elements by boltsto compress the photovoltaic assemblies. Water-proof covers are arranged on the pressing blocks; sliding blocks are arranged in the chutes; sliding block bolts are arranged in the sliding blocks and are connected with clamping blocks to fix the main water tank and C-shaped purlines. Therefore, a water leakage problem caused by penetration and fixation of the bolt in the prior art is solved; and the photovoltaic assemblies are installed conveniently.

The invention belongs to the automobile component technology field and provides a heatable radome structure and a production method thereof. The structure comprises a diaphragm, a heating wire and anouter plate. A coating is arranged on the heating wire, the heating wire with the coating is printed on the diaphragm according to a set layout to form an integral heating diaphragm piece. The radomestructure further comprises a conducting sheet and a connector. The heating diaphragm piece and plastic carry out insert molding so as to form an outer plate, a conductive connecting hole is arrangedbetween an end portion of the heating wire and the outer plate, the conductive connecting hole is filled with conductive metal slurry in a coating mode, the conducting sheet is electrically connectedwith the heating wire through the conductive metal slurry, and the connector is connected to the conducting sheet. The structure and the method have advantages that procedures of punching of the diaphragm, the heating wire and the conducting sheet, sealing of a welding hole and shielding of a chromium-plated part can be avoided; and a percent of pass is higher, the chromium-plated part used for shielding the sealing hole can be omitted. Compared with a scheme in the prior art, the scheme of the invention has advantages of a simple structure, simple procedure, a high binding force of a front cover plate and a rear cover plate and low cost.

The invention discloses a construction method for a double-wall steel cofferdam without bottom sealing concrete in deepwater bare rock geology. The construction method comprises the following steps that the prefabricated steel cofferdam is transported to a bridge pier position; in the water flow direction, the end, close to the upstream, of the steel cofferdam is fixed by a winch through a steel wire rope, the end, close to the downstream, of the steel cofferdam is fixed through a positioning tail anchor and a positioning ground anchor, the two side faces of the steel cofferdam are pushed in an ejecting mode through a tugboat for comprehensive positioning; a positioning groove is excavated in the position, below the steel cofferdam, of the bridge pier position in advance, and then the steel cofferdam sinks to the designed elevation, positioning groove concrete is poured, and the positioning groove concrete and an impervious layer jointly form a water-resisting layer so as to stop and isolate water. The steel cofferdam is positioned through grooving, large-range blasting does not need to be conducted, bottom sealing concrete with large thickness is not poured, excavation of a riverbed is reduced, the influence on the surrounding environment is reduced to the maximum degree, and the requirement for environmental protection is met.

The embodiment of the invention discloses a display panel alignment method and a display panel preparation method. The method comprises the steps: a display panel is provided, wherein the display panel comprises a bending area; the display panel is marked to obtain a first mark; the bending area is marked to obtain a second mark; an alignment point is determined through the first mark and the second mark; and pre-alignment is conducted on the bending area and the display panel according to the alignment point. Alignment is carried out through the relation between the first mark and the alignment point and the relation between the second mark and the alignment point, complex procedures such as punching in a bending area are replaced, punching in the bending area is avoided, the damage rateof a circuit board is reduced, manufacturing procedures are reduced, and production efficiency is effectively improved.

The invention discloses a novel welding device special for a color steel roofing photovoltaic support and an operation process. The novel welding device special for the color steel roofing photovoltaic support comprises a welding gun and a welding power supply. A pressure adjusting knob, a linear bearing and a welding switch are arranged on the welding gun; a chuck stroke column is arranged on the linear bearing; a welding bolt chuck is arranged on the lower end of the chuck stroke column; a welding bolt is arranged on the welding bolt chuck; a special welding bot is placed in the welding bolt; and the welding power supply comprises a transformer, a charging rectifier bridge, a charging silicon controlled rectifier, an energy storage capacitor, a discharging silicon controlled rectifier, a ground lead and a grounding clamp. The operation process of the novel welding device special for the color steel roofing photovoltaic support comprises the steps of switching on the power supply, clamping the welding bolt, welding, and carrying out preservative treatment on welding points. The welding device special for the color steel roofing photovoltaic support has the following characteristics that the photovoltaic support and color steel tiles are connected in a welding way, so that punching on a color steel roofing is avoided, a roofing waterproof effect is not damaged, the structure strength of the photovoltaic support is improved, and the used parts is less.

The invention discloses a lead fixing device. The lead fixing device is used for fixing a lead on the composite cross arm. The composite cross arm comprises an insulation core rod and an insulation layer which is covered outside the insulation core rod, the lead fixing device comprises a cross arm connection member and a lead fixing member, wherein the cross arm connection member is fixedly connected with outer periphery of the insulation core rod in a covering mode, the cross arm connection member abuts the insulation layer, the lead fixing member is provided with a wire duct used for accommodating a lead, and the leading fixing member is fixed at outer periphery of the cross arm connection member and is used for fixing the lead in the wire duct. The invention further discloses the composite cross arm. The lead fixing device is advantaged in that the cross arm connection member and the insulation core rod realize compact connection and has good sealing property, fracture of the insulation core rod can be effectively avoided, moreover, the wire duct used for accommodating the lead is arranged on the lead fixing member, through fixing the lead fixing member at the outer periphery of the cross arm connection member, the lead is fixed and limited in the wire duct, lead binding is not required, later maintenance workload is reduced, and engineering maintenance cost is reduced.

The invention discloses a steel-reinforced concrete column and reinforced concrete beam node connecting method, which comprises an upper flange plate and a lower flange plate, wherein a web plate is connected between the upper flange plate and the lower flange plate; male pins and angle steel corbel plates are welded at the outer sides of the upper flange plate and the lower flange plate; a beam longitudinal steel bar is welded on each angle steel corbel plate; and a steel bar horizonal tie bar is welded between the upper flange plate and the lower flange plate. The steel-reinforced concrete column and reinforced concrete beam node connecting method designed by the invention has the advantages that firstly, the angle steel corbel plates and reinforced concrete beams are welded; the problemthat the anchoring length and the welding length of the beam longitudinal steel bars and the angle steel corbel plates are insufficient due to specific dimension of a section steel column is avoided;then, the steel bar horizonal tie bar is used; the section steel column and beam welding node is prevented from generating flange buckling, i.e., the node generates local instability; meanwhile, thepunching in flanges is avoided; and the rigidity and the intensity of the steel-reinforced concrete column and reinforced concrete beam node are ensured.

The invention provides a fixing structure for a pre-embedded channel for a duct piece in a subway shield zone. The pre-embedded channel can be fixedly mounted on a duct piece mold bottom arc plate bythe aid of multiple fixing structures; the pre-embedded channel comprises arc-shaped channel steel and multiple anchor rods fixed to the closed end of the arc-shaped channel steel; each fixing structure comprises a positioning nut, a positioning threaded rod and a locking screw; the positioning threaded rods penetrate through corresponding mounting holes in the arc-shaped channel steel and corresponding positioning holes in the duct piece mold bottom arc plate during mounting; each positioning nut penetrates through the corresponding mounting hole in the arc-shaped channel steel to screw and position one end of the corresponding positioning threaded rod on the closed end surface of the arc-shaped channel steel during mounting; and each locking screw is in threaded connection with the otherend of the corresponding positioning threaded rod in a sleeving manner to lock the other end of the corresponding positioning threaded rod on the duct piece mold bottom arc plate during mounting. Theinvention further provides a pre-embedment construction method for the pre-embedded channel for the duct piece in the subway shield zone. Hole drilling on the duct piece is avoided, the integrity ofthe duct piece structure is guaranteed, and the life of the project is prolonged.

The invention discloses an engine flow resistance testing device and a testing method thereof. The engine flow resistance testing device comprises an ultrasonic wave flow sensor, a mounting mechanismfor mounting the ultrasonic wave flow sensor on an engine, a processor for processing acquired information, and a display device. The ultrasonic wave flow sensor is connected with the processor through a data wire I. The processor is connected with the display device through a data wire II. The mounting mechanism comprises a mounting bracket, a sensor mounting chamber and a fixing mechanism. The sensor mounting chamber is connected with the mounting bracket. The ultrasonic wave flow sensor is mounted in the sensor mounting chamber. The fixing mechanism is arranged on the mounting bracket. Themounting bracket is provided with a track. A mounting chamber I is slidably connected with the track. The whole sensor mounting chamber can move along the track. The ultrasonic wave flow sensor can befinely adjusted in a horizontal plane. The testing device and the testing method according to the invention are used for testing the flow of each oil duct of the engine, thereby substantially understanding true data of each oil duct flow resistance (namely oil consumption) and performance of the engine.

The invention discloses a double-layer non-coplanar suspended ceiling and a mounting method. The double-layer non-coplanar suspended ceiling comprises a first wall surface and a second wall surface which are oppositely arranged and further comprises a first-stage vertical frame and a mounting plate. A second-stage vertical frame is connected with the first-stage vertical frame, and a mounting assembly comprises two positioning pieces, and each positioning piece comprises a first sliding piece and further comprises a first supporting plate and a second supporting plate which are vertically connected. The first sliding pieces are slidably arranged on the second supporting plates, and the two first supporting plates on the mounting assembly are fixed to the first wall surface and the second wall surface correspondingly. The two ends of hanging keels are connected with the two first sliding plates on the mounting assembly in a one-to-one correspondence mode, and the two ends of supportingkeels are in lap joint with the two hanging keels correspondingly. The supporting keels are connected with the mounting plate. The mounting method for double-layer non-coplanar suspended ceiling is used for mounting the double-layer non-coplanar suspended ceiling. According to the double-layer non-coplanar suspended ceiling and the mounting method provided by the invention, the number of hanging rods is decreased, the stability of the first-stage vertical frame and the second-stage vertical frame after hanging connecting is improved, and the tidiness of the construction environment is improved.

The invention discloses an aluminum film welding machine, which includes a drive system for transporting powder liquid bags; an automatic bag loading device for transferring the powder liquid bags to the clamping device of the drive system; The film device is used for punching the continuous aluminum film into a sheet film of a predetermined size, and transferring the film to the first welding device; the second aluminum film punching and upper film device is used for punching the continuous aluminum film into a sheet film of a predetermined size, and transfer the sheet film to a second welding device; a bag turning device, arranged between the first welding device and the second welding device, is used to transfer the first The powder liquid bag welded on one side of the welding device is turned over 180°; the cooling device is used to cool the powder liquid bag that has been welded on both sides; the punching device is used to punch the cooled powder liquid bag; the bag output device is used to output Die-cut pouches. The use of sheet film welding powder liquid bags improves the position accuracy of aluminum film welding, and at the same time reduces the waste of aluminum film during the sheet film welding process, which serves multiple purposes.