1346 results about "Tube diameter" patented technology

The invention discloses a roundness supporting device for a large tubular structure and a roundness adjusting method.The roundness supporting device comprises the roundness supporting device body, the roundness supporting device body comprises a circular base and a plurality of supporting columns, and the supporting columns are distributed on the circumferential face of the circular base in a circumferential array mode; the end, away from the circular base, of each supporting column can abut against the inner wall of the circular steel pipe. The device further comprises a rotating column, the rotating column is coaxially installed on the circular base, and a hydraulic expansion piece is vertically connected to the rotating column. The end of the telescopic part of the hydraulic telescopic device is connected with a contour wheel, and the hydraulic telescopic device stretches out to enable the contour wheel to be in rolling fit with the inner wall of the circular steel pipe. The device further comprises a distance sensor, and the distance sensor can detect the change of the distance between the profiling wheel support and the axis of the rotating column in real time. According to the tubular steel roundness adjusting device, the roundness of tubular steel can be accurately adjusted, the machining requirements of large tubular steel with different pipe diameters can be met, accidents such as eccentricity of the tubular steel in the machining process can be avoided, and therefore the finished product quality and operation safety are improved.

The invention relates to the technical field of plastic-lined pipe production, in particular to an automatic bonding device for large-diameter plastic-lined pipe production. The invention provides an automatic bonding device for large-diameter plastic-lined pipe production, which can adapt to plastic-lined pipes with different pipe diameters and ensure the bonding quality and the production efficiency of the plastic-lined pipes. An automatic bonding device for large-diameter lining plastic pipe production comprises a base, side plates and the like, and the side plates are connected to the upper sides of the left portion and the right portion of the base. After a metal pipe penetrates through a heat conduction ring and a water spraying ring, a contact roller makes contact with the outer wall of the metal pipe, a high-temperature-resistant rubber ring and a shaping rubber block are extruded by the outer wall of the pipe to deform, and gaps between the heat conduction ring and the pipe are filled in a self-adaptive mode, so that the gaps of the same size are always kept between alumina fiber heat preservation cotton and the outer walls of the metal pipes with different pipe diameters; and the effects that the device can adapt to the plastic-lined pipes with different pipe diameters, and the bonding quality and the production efficiency of the plastic-lined pipes are ensured are achieved.

The invention relates to the technical field of socket steel pipes, and provides socket steel pipe machining equipment which comprises an expanding forming machine, and a machining feeding port is formed in the front end face of the expanding forming machine; the bearing frame is arranged on the front side of the front end face of the expanding forming machine, and the length direction of the bearing frame is parallel to the axial direction of the machining feeding port. The lifting carrier roller frames are arranged on the bearing frame at intervals in the length direction of the bearing frame and used for bearing steel pipes and adjusting the height of the steel pipes so that the steel pipes can be aligned to the machining feeding opening. The multiple discharging vertical plates are arranged on the bearing frame at intervals, at most one discharging vertical plate is arranged between every two adjacent lifting carrier roller frames, and after the lifting carrier roller frames descend to the height lower than the discharging vertical plates, the first guide faces are used for guiding the steel pipes to slide to one side of the bearing frame. The technical problems that in the prior art, feeding and discharging time is long after socket steel pipes are machined, and pipelines with different pipe diameters cannot be rapidly and accurately centered are solved.

The invention discloses a carbon fiber pipe inner wall polishing mechanism which comprises a base, a fixing frame is fixedly mounted at the top of the base, a reciprocating assembly is mounted in the fixing frame, a connecting assembly is fixedly mounted at the top of the reciprocating assembly, an axis assembly is rotatably mounted in the connecting assembly, and one end of the axis assembly is in transmission connection with an output assembly. One end of the shaft center assembly is fixedly provided with an adjusting assembly, the other end of the shaft center assembly is fixedly provided with a support assembly, the shaft center assembly is in threaded connection with the adjusting assembly, and the top of the support assembly is fixedly provided with a polishing assembly. Different instruments do not need to be replaced according to the pipe diameter every time the pipe is replaced, the fine-mesh grinding block is installed on the installation frame connected with the first fixing cylinder, the coarse-mesh grinding block is installed on the installation frame connected with the second fixing cylinder, and the problem that fine grinding is conducted after coarse grinding is completed, and a grinding head needs to be detached and replaced is solved.

The invention relates to the technical field of welding, and discloses a precise positioning thin-wall refrigeration pipe deformation-free welding tool which comprises positioning plates, the bottom ends of the positioning plates are slidably connected with the top end of a workbench, the positioning plates are symmetrically distributed with the median line of the workbench as the center, and one end of one positioning plate is provided with an outer pressing piece for limiting the outer wall of a pipeline; an inner supporting piece for supporting the inner wall of the pipeline is arranged at the end, close to the outer pressing piece, of the other positioning plate. The inner supporting piece is provided with the supporting rings, the supporting rings are located on the two sides of a pipeline welding seam correspondingly, different-diameter parts of the reducer pipe can be supported correspondingly, the inner supporting piece adapts to refrigeration pipes with different pipe diameters, the universality of the inner supporting piece is improved, and the welding supporting requirements of the refrigeration pipes of various specifications can be met; the two supporting rings are arranged on the same circular shaft, the coaxiality of the two supporting rings is guaranteed, then it is guaranteed that the circle centers of the two parts of the reducer pipe are always coaxial, and the position precision of a pipeline can be maintained in the welding process.

The invention discloses a diaphragm valve flow test system and method, and the system comprises a first test assembly and a second test assembly, and a first pressure measurement port of the first test assembly and a second pressure measurement port of the second test assembly are respectively communicated with a to-be-tested valve; a first test pipeline communicated with the first test assembly is provided with a circulation path in a first direction; a second testing pipeline communicated with the second testing assembly is provided with a circulation path in the first direction. The upstream and downstream pressure values of the to-be-tested valve can be accurately detected through the first pressure gauge and the second pressure gauge, and the gas flow value is detected through the flow meter and substituted into a calculation formula to obtain an accurate flow coefficient value; the upstream first testing assembly and the downstream pressure measuring device are arranged at a specific distance according to the pipe diameter of the communicating pipeline, and the accuracy of the pressure value can be effectively ensured through the limitation of the pipe diameter and the distance; the actual temperature value of the fluid in the test system pipeline is monitored through the thermometer, and the influence of the temperature on the test result is effectively reduced.

The device comprises a mold body, a first pushing assembly and a second pushing assembly, the first pushing assembly comprises a first driving part and a first pushing head, the first pushing head is provided with a cavity, the cavity penetrates through the two ends of the first pushing head, the first pushing head is further provided with an opening, and the opening communicates with the cavity; the second pushing assembly comprises a second driving part, a second pushing head and a filling ball, the filling ball enters the cavity through the opening, and the second pushing head is driven by the second driving part to push the filling ball to move into the pipe blank along the cavity. Therefore, the bent pipe with the large pipe diameter and the small bending radius can be formed through secondary push bending of the second pushing assembly on the premise that pressure is not unloaded after primary push bending forming, larger bent pipes with more specifications and sizes can be formed on machine tool equipment with limited specifications, the cost of the machine tool equipment is saved, and the production efficiency of the bent pipe is improved.

The invention discloses a foundation treatment method for determining the thickness of a replacement cushion layer of an underground water supply and drainage pipeline. The foundation treatment method comprises the steps that S1, it is determined that a pipeline foundation is a concrete foundation or a gravel foundation; s2, the required foundation bearing capacity is calculated; s3, checking whether the bearing capacity of the uncorrected pipe bottom soil layer foundation meets the design requirement or not, and if yes, carrying out foundation treatment of replacing and filling a cushion layer; if not, foundation treatment of the replacement cushion layer is conducted, and the thickness of the replacement cushion layer is calculated according to the following formula; according to the method, the accuracy and quickness of calculation of the replacement thickness are improved, the working efficiency is improved, unnecessary waste is reduced, the foundation treatment method for determining the foundation bearing capacity needed by pipelines with different pipes, pipe diameters and earthing thicknesses and the thickness of the replacement cushion layer is provided, the needed foundation bearing capacity is determined according to the different pipes, pipe diameters and earthing thicknesses, and the foundation treatment effect is improved. And when a soft soil layer exists at the bottom of the pipe, a foundation treatment method adopting a replacing and filling cushion layer is provided, the requirement for foundation bearing capacity can be met, and safe operation of the pipe is guaranteed.

The invention relates to the field of laser cutting, in particular to a pipe diameter self-adaptive laser pipe cutting machine and method, the pipe diameter self-adaptive laser pipe cutting machine comprises a cutting table and a cutting head, and the cutting table is connected with a limiting assembly which corresponds to the cutting head and is used for limiting pipe fittings with different pipe diameters; through cooperative work of the multiple adjusting screws and the limiting balls, the limiting position can be automatically adjusted according to different pipe diameters, self-adaptive clamping of pipe fittings with various pipe diameters is achieved, the application range is wide, meanwhile, through limiting cooperation of the limiting arc plates and the limiting balls and centripetal pressure provided by the abutting screws, the pipe fittings with the different pipe diameters can be clamped, and the clamping precision is improved. And it is ensured that pipe fittings with different pipe diameters can be kept stable in the cutting process, and the situation that cutting errors affect the quality of cut finished products is avoided.

The invention discloses a high-thermal-conductivity insulating electric power engineering material and a preparation method thereof, and relates to the technical field of insulating material preparation. The composite material is prepared from 40-60 parts of polyimide resin, 20-30 parts of boron nitride nanosheets, 10-15 parts of alumina micro powder, 5-10 parts of a silane coupling agent, 3-8 parts of a plasticizer, 2-5 parts of an antioxidant, 1-3 parts of carbon nanotube whiskers, 1-2 parts of graphene quantum dots and 0.5-1 part of rare earth yttrium oxide. The diameter-thickness ratio of the boron nitride nanosheet is 100-200, the particle size of the alumina micro powder is 1-5 [mu] m, the diameter of the carbon nanotube whisker is 5-20 nm, the length is 1-5 [mu] m, and the particle size of the graphene quantum dot is 2-10 nm; all the raw materials are synergistically matched, so that the material is expected to have high thermal conductivity and excellent insulating property and is suitable for the field of electric power engineering. The material has high thermal conductivity and excellent insulativity, the thermal conductivity coefficient is not lower than 5 W / (m.K), the volume resistivity is not lower than 1015 omega.cm, and the breakdown field strength is not lower than 30 kV / mm.

The utility model relates to the technical field of pipeline processing, in particular to a rotary friction welding device for a large-pipe-diameter pipeline, which comprises a placing frame, the pipeline is placed on the placing frame, a pipeline clamping mechanism is installed at the front end of the placing frame to clamp the pipeline and align to a joint, and the joint is clamped in a joint profiling welding tool and is driven by a welding standard machine to rotate and feed. A tail plate is arranged at the rear end of the placing frame, the tail plate moves at different positions of the track to be connected with the pipeline in a clamping mode, pipeline products of different lengths are welded, a connector profiling tool opposite to the connector profiling welding tool is arranged on the tail plate, and the connector profiling tool is matched with the connector profiling welding tool to adjust the relative angle of connectors welded to the two ends of the pipeline. The situation that the installation condition of a client cannot be met due to too large relative angle deviation is prevented; the welding device is used for solving the problem of welding of the pipeline and the connector, welding of the pipeline and the connector can be rapidly achieved at low cost, and the installation requirement and the market requirement of the energy storage pipeline are met.

The utility model relates to a positioning device for machining an integrated thin-walled tube, and belongs to the technical field of machining. When in use, an operator axially inserts the device into a pipe hole of the thin-walled pipe, adjusts the axial position of the conical pin through the screw rod, and further pushes the wedge-shaped block to move along the supporting pipe in the radial direction, so that the inner wall of the thin-walled pipe is supported in the radial direction, vibration of the thin-walled pipe in the machining process is effectively reduced, and machining efficiency is improved. Deformation and damage of the thin-walled tube caused by cutter pressure are avoided, the geometrical shape and dimensional accuracy of the thin-walled tube are guaranteed, and therefore the machining stability and the surface machining quality of the thin-walled tube are improved.

The utility model discloses PE pipe polishing equipment which comprises a feeding assembly, and outer polishing assemblies are arranged at one end of the feeding assembly side by side. Inner polishing assemblies are arranged at the ends, away from the feeding assembly, of the outer polishing assemblies side by side. The outer polishing assembly and the inner polishing assembly are arranged at the same time, synchronous polishing treatment on the inner surface and the outer surface of the PE pipe is achieved, the polishing period is remarkably shortened, and the production efficiency is improved; two polishing rollers in the outer polishing assembly are driven in a chain transmission mode, and the rotating speed and the rotating direction can be flexibly adjusted so as to meet the polishing requirements of PE pipes of different materials and wall thicknesses. Meanwhile, the inner polishing assembly can accurately adjust the position and height of a polishing wheel through cooperation of a linear sliding table and a worm gear lead screw lifting machine, the polishing machine is suitable for polishing PE pipes of various pipe diameters, the frequency of replacing a polishing head is reduced, the cost is greatly reduced, and therefore an efficient, economical and reliable solution is provided for polishing treatment of the PE pipes.

A borehole inclination measuring device belongs to the technical field of borehole inclination measuring and comprises a protruding block with a through opening, at least three movable rods are rotatably mounted on the outer surface of the lower end of the protruding block at equal intervals in the circumferential direction, auxiliary wheels are rotatably mounted at the top ends of the movable rods, and springs are fixedly mounted between the movable rods and the outer surface of the protruding block. The position of the top end of the movable rod can be adjusted in a self-adaptive mode, the auxiliary wheel is made to be attached to the inner side wall of the inclinometer pipe, the auxiliary wheel is made to be attached to the inner side wall of the inclinometer pipe, the auxiliary wheel is made to be attached to the inner side wall of the inclinometer pipe, and the auxiliary wheel is made to be attached to the inner side wall of the inclinometer pipe. The applicability of the device in the environment of inclinometer pipes with different pipe diameters is greatly enhanced, and a powerful guarantee is provided for high-precision and high-efficiency borehole inclinometer work.

The invention relates to the field of RTP pipelines, in particular to a large-diameter special composite RTP pipeline rapid installation device which comprises a first end, a second end, a limiting ring, a connecting device, a first circular ring and a second circular ring. A connecting ring is formed at the first end, and a first limiting groove and a second limiting groove are formed in the inner side and the outer side of the connecting ring correspondingly; a connecting cavity capable of being matched with the connecting ring is formed in the second end, the limiting rings are embedded in the inner side and the outer side of the connecting cavity respectively, the connecting devices are arranged on the first limiting groove and the second limiting groove respectively, magnets are arranged on the connecting devices, and the magnets on the first limiting groove and the magnets on the second limiting groove are opposite in magnetism. The first limiting groove is sleeved with the first circular ring, the second circular ring is arranged in the second limiting groove, the thermal bimetallic strips are arranged on the outer side of the first circular ring and the inner side of the second circular ring correspondingly, pipelines with pipe diameter differences can be rapidly connected under the eccentric condition, and the pipeline installation efficiency can be improved while the problem of uneven stress is solved.

The invention provides a clamp suitable for various pipe diameters and a clamping method. The clamp comprises a first base with a guide groove, a clamping piece arranged on the first base in a sliding mode, an asynchronous adjusting device, a synchronous adjusting device and a clutch device. Wherein the asynchronous adjusting device and the active adjusting device can adjust the position of the clamping piece, so that the clamp can adapt to tubular workpieces with different pipe diameters; besides, the engagement or disengagement state of the driving gear and the driven gear of the synchronous adjusting device can be switched through the clutch device, so that different clamping pieces can be asynchronously adjusted according to the section shape of the tubular workpiece to be clamped, and the clamp can adapt to the section shape error of the tubular workpiece.

The invention relates to the technical field related to intelligent production control, in particular to a powder spraying method and system for the surface of a slender pipe and a medium, and the method comprises the steps that the preprocessed slender pipe is placed on a workbench containing multiple assemblies, electrostatic spraying is conducted through a spray gun, powder feeding adjustment is conducted, the angle of a flow guide groove is dynamically adjusted according to parameter combination, and spraying uniformity is controlled in combination with rotating speed induction. The technical problems that dynamic parameter matching mechanisms for different pipe diameters and wall thicknesses are lacked, airflow changes in the inner space of a slender pipe are difficult to cope with, and uneven distribution of powder in the pipe is likely to be caused are solved, the coating thickness deviation is controlled by associating a spray gun mechanism with a pipe rotating assembly, and the spiral angle of a flow guide groove is dynamically adjusted along with friction torque; and the piezoelectric centrifugal switch is used for detecting the rotating speed fluctuation in real time, the spray gun displacement compensation and the powder feeding amount adjustment are automatically triggered to enable the powder to be distributed in the pipe, and the machining efficiency is improved on the basis that the powder spraying quality of the surface of the long and thin pipe is guaranteed.

The invention provides a special demoulding outer frame structure for drawing a thin-wall capillary belt core. The special demoulding outer frame structure is composed of a vertical plate, a bearing seat, large-angle aluminum, a bottom plate, a cross beam, a front guide pipe, small-angle aluminum, a baffle, profile aluminum, a rear guide pipe and a standard bolt assembly. Wherein the two vertical plates are placed on the bottom plate and fixed to the bottom plate through three sets of large-angle aluminum arranged on the inner side and the outer side of the lower end at equal intervals, the upper end is fixed through section aluminum, and the rigidity and stability of the structure are guaranteed; two baffles are symmetrically arranged between the two vertical plates and are combined and fixed through four cross beams and eight pieces of small-angle aluminum; a demolding working area is arranged between the two baffles, and a front guide pipe and a rear guide pipe are installed on the outer sides of the two baffles respectively and used for feeding in and discharging out of the thin-wall capillary tube. Three bearing seats are respectively mounted on the outer sides of the two vertical plates and are used for fixing bearings in a demolding working area, and the relative height among the bearings is realized by adjusting the positions of the bearing seats. Demoulding of thin-wall capillary tubes with different tube diameters can be realized by adjusting the height of the bearing seat.

The utility model provides a socket and spigot type concrete pipe lifting appliance, and belongs to the technical field of pipeline lifting. The socket and spigot type concrete pipe lifting appliance comprises a pipeline supporting piece and a lifting hook connecting piece, the pipeline supporting piece comprises an inserting part used for being inserted into a pipeline opening and a connecting part used for being connected with a lifting hook, and when the inserting part is inserted into a pipeline, the connecting part is located outside the pipeline. The pipeline hoisting device has the advantages of being convenient to operate, suitable for hoisting reinforced concrete pipelines with various pipe diameters and capable of improving the pipeline hoisting efficiency.

The invention relates to an outer cylinder prestress reinforced composite material pipe and a design method thereof, and belongs to the technical field of fluid conveying pressure pipelines. The pipeline comprises an outer cylinder, a middle steel cylinder and a concrete inner cylinder, the pipe diameter is 1600-5000 mm, the outer cylinder is composed of a composite material formed by mixing multiple layers of annularly-wound glass fibers and epoxy resin and is prestressed, the glass fibers account for 50%-70% of the volume of the outer cylinder, the equivalent elastic modulus, the Poisson's ratio and the tensile strength are calculated, mechanical analysis of the composite material is simplified, and the tensile strength of the composite material is improved. The middle steel cylinder is configured as a supporting layer, and the concrete inner cylinder is configured as a pressure-resistant and fluid channel. Based on the thick-wall cylinder theory, the prestress of the outer cylinder enables the concrete inner cylinder to be pressed in advance, the internal pressure tensile stress is counteracted, and the cracking risk is reduced. Under regulation and control of prestress, the outer cylinder bears main circumferential tension, tension of the middle steel cylinder is reduced, and cooperative bearing is achieved. The composite pipe has high strength, light weight and corrosion resistance, the problems that a traditional pipe is prone to cracking, high in steel consumption and short in service life are solved, and safety, durability and economical efficiency are remarkably improved.

The invention relates to the technical field of gas tightness testing, in particular to a device and a method for testing gas tightness at a weld joint of a stainless steel pipe, the testing device comprises a sliding bottom plate, two outer frames are arranged at the top of the sliding bottom plate, and a pressurizing assembly and a pressure sensor are fixedly connected to the circle centers of the two outer frames in a penetrating manner respectively; the outer walls of the pressurizing assembly and the pressure sensor are rotatably connected with conductive rubber respectively, the outer walls of the two conductive rubber are fixedly provided with convex rings respectively, the inner walls of the two outer frames are fixedly provided with sealing rings respectively, the two outer frames are internally provided with liquid storage cavities respectively, and the testing method comprises the steps of preparation, sealing, filling and the like. The filling gap is sealed by the magnetic fluid, even if the pipe diameter of the pipeline changes slightly or the surface of the pipeline is uneven, the magnetic fluid can be tightly attached to the surface of the pipeline to form a tight sealing layer, the magnetic fluid can be solidified to adapt to the shape of the gap, the plugging effect on the filling gap is improved, and the testing accuracy is ensured.

The invention discloses a large-pipe-diameter nickel base alloy composite pipe welding method and an auxiliary device.Each composite pipe comprises a composite layer and a base layer covering the composite layer in a sleeving manner, the welding method comprises the following steps that firstly, the to-be-welded ends of two sets of composite pipes are machined, X-shaped grooves are formed in the positions of the to-be-welded ends of the two sets of composite pipes, and the to-be-welded ends of the two sets of composite pipes are welded; then the X-shaped groove is polished through an auxiliary device; secondly, the two sets of composite pipes are assembled in a butt joint mode, and a base layer is welded according to the sequence of bottoming, filling and capping; and thirdly, the transition layer and the composite layer are sequentially welded according to the bottoming, filling and covering sequence. According to the method, the X-shaped groove is adopted, the double-face welding mode is adopted, argon gas back face protection is not used in the whole welding process, compared with a traditional welding method, the welding material cost is saved, the welding work efficiency is improved, a large amount of argon gas is saved, the welding steps are simplified, the welding material cost is low, the number of welding layers is small, the construction period is shortened, and energy conservation and emission reduction are achieved.

The invention relates to a negative pressure quantitative adjustment and fine adjustment system for vacuum sizing of a drip tape production line, and belongs to the field of mechano-electronics. By adopting a mode of combining a mechanical design technology, a microelectronic technology, a communication technology, a pneumatic technology and the like, quantitative adjustment and fine adjustment of the vacuum degree in the vacuum sizing box are realized through independent work or matched and combined work of the air inlet nozzles with different calibers; and the combination mode of the air inlet nozzles stored in the EEPROM storage chip is called according to the production requirements of different pipe diameters and wall thicknesses, so that the production efficiency is effectively improved, and the purposes of accurately determining the diameter and the pipe wall thickness of the drip irrigation belt production line are achieved. The whole system has the advantages of high precision, low cost, convenience in use, high efficiency and the like, and has a wide market prospect.

The invention discloses an air tightness detection system and method suitable for PE pipe fittings and valves with various calibers, the system adopts an end connecting piece with multi-stage stepped grooves at two ends to adapt to different pipe diameters, and a self-reset switch is used for automatically identifying the step level of the pipe valve and activating a corresponding inflatable sealing ring group. During detection, the controller coordinates the inflation device to work in two ways, the sealing gas way conducts grading inflation sealing on the annular inflation sealing ring of the selected layer, the detection gas way pressurizes the closed cavity, and the pressure transmitter monitors pressure attenuation to judge the airtightness. By combining a water immersion test and a machine vision technology, bubble trajectory tracking is realized through dynamic background modeling, ROI (Region of Interest) extraction and morphological processing, and the position of a leakage point is accurately mapped. The system is provided with a sealing ring redundancy design mechanism, when leakage is detected, a standby sealing ring can be intelligently switched for reinspection verification, and the system is especially suitable for quality detection of a PE pipe fitting and a valve welding seam.

The utility model relates to the technical field of all-air air-conditioning systems, in particular to a novel all-air air-conditioning transmission and distribution pipeline system which comprises a variable-diameter pipeline joint connected with an air outlet of a unit, one end of the variable-diameter pipeline joint is connected with a first rectangular straight pipe, one end of the first rectangular straight pipe is connected with a transition assembly used for penetrating through a wall or a lintel, and the other end of the first rectangular straight pipe is connected with a second rectangular straight pipe. The transition assembly is connected to one end of a second rectangular straight pipe, the other end of the second rectangular straight pipe is connected with one end of a third rectangular straight pipe through a rectangular straight joint, and the other end of the third rectangular straight pipe is connected with a rectangular elbow. According to the novel all-air air conditioner transmission and distribution pipeline system, the purpose of reducing the pipe diameter can be achieved through connection among the square-to-round straight joint, the round straight pipe and the round-to-square elbow, damage of system construction to a building main body structure is reduced, construction accidents are avoided, and the construction efficiency is improved. And it can be guaranteed that air passing through the pipeline can carry enough cold and heat quantity and fresh air demand quantity, and it can be guaranteed that the cold and heat quantity value conveyed to each room is balanced.

The invention discloses a large-pipe-diameter heavy steel pipe conveying device suitable for a U-shaped valley high abrupt slope section, and belongs to the technical field of pipeline transportation, the large-pipe-diameter heavy steel pipe conveying device comprises a pipeline buttress, a rail, a conveying assembly and a winch, the conveying assembly is in sliding connection with the rail, and the winch is connected with the conveying assembly through a steel wire rope; the conveying assembly comprises a supporting assembly and lifting assemblies located on the two sides of the supporting assembly, the supporting assembly and the lifting assemblies are connected through traction rods, and pulley assemblies matched with the rails are arranged at the bottom of the box body and the bottom of the door frame. The pipelines are supported through the steel cables in the supporting assembly, the pipelines are lowered and adjusted through the lifting assembly, lifting and conveying of the multiple pipelines can be achieved through the multiple lifting tools, the number of times of resetting of the conveying assembly is reduced, and the pipe conveying and distributing efficiency is effectively improved.

The invention provides a Venturi tube anti-flash-rust agent filling mechanism which comprises a Venturi jet device, the inside of the Venturi jet device is sequentially provided with a first inlet section, a first contraction section, a first throat part and a first diffusion section from left to right, the first inlet section is cylindrical, the first contraction section is gradually contracted from the tail end of the first inlet section, and the first throat part is communicated with the first diffusion section. The first throat part is the position with the smallest pipe diameter, and the first diffusion section is gradually enlarged from the tail end of the first throat part. Compared with the prior art, the device has the following beneficial effects that the independent mixing mechanism is arranged, the mixing cylinder is integrated at the joint of the venturi jet device and the venturi flow meter, and not only is the mixing impeller arranged in the cylinder, but also the baffle plates arranged at equal intervals are arranged in the cylinder. When the fluid flows through the mixing cylinder, the mixing impeller rotates under the pushing of the fluid to actively stir the flash rust preventing agent and the main fluid, and the baffle plate further changes the flow direction of the fluid to form a turbulent flow effect, so that the mixing uniformity is greatly improved.

The invention provides an optimal design method for urban underground pipelines, aims to solve the problems of high coordination difficulty, low design efficiency and easiness in pipeline mistake and collision in the design process of newly-arranged underground pipelines, and belongs to the technical field of pipeline design. A city underground pipeline optimization design method comprises the steps that a ground penetrating radar is used for conducting lossless exploration on a preset pipeline construction route so as to obtain three-dimensional coordinates and pipe diameter data of an existing underground pipeline; establishing an existing underground pipeline three-dimensional model of the preset pipeline construction route; importing the established three-dimensional model of the existing underground pipeline into pipeline aided design software, and determining the pipeline diameter, the slope and the burial depth of the newly arranged pipeline for rainwater drainage, the pipeline diameter, the slope and the burial depth of the newly arranged pipeline for sewage drainage and the types, the number and the scale of other newly arranged pipelines according to the determined pipe diameter, the slope and the burial depth of the newly arranged pipeline for rainwater drainage and the determined pipe diameter, the slope and the burial depth of the newly arranged pipeline. And carrying out pipeline arrangement, spatial analysis and optimization adjustment by utilizing the pipeline aided design software until the pipeline is error-free and collided, and outputting a scheme. The design efficiency is improved.

The utility model relates to the field of bathroom facilities, in particular to a pedestal pan which comprises a barrel body (1) and a pipeline (2) connected with the barrel body. The barrel body comprises a dirt falling opening (12) formed in the bottom of the barrel body, and a spraying opening (15) is formed below the dirt falling opening. The pipeline comprises a pipeline opening (21), an ascending section (22), a descending section (23) and a pollution discharge section (24), wherein the ascending section (22), the descending section (23) and the pollution discharge section (24) are sequentially connected end to end. The connecting position of the ascending section and the descending section is the highest point of the ascending section and the descending section. The direction of the jet orifice is opposite to the pipeline orifice. And the pipe diameters of the ascending section and the descending section are gradually reduced along the water flow direction. The ratio of the sectional area of the pipeline opening to the area of a first section (221) between the ascending section and the descending section is 1: 0.52-1: 0.72, and the ratio of the sectional area of the pipeline opening to the area of a second section (231) between the descending section and the pollution discharge section is 1: 0.53-1: 0.63. According to the pipeline with the ratio, more flushing dirt can be quickly discharged, the flushing capacity of the pedestal pan is improved, and blockage can be reduced due to the increased pipe diameter.

The invention discloses a rapid assembly welding construction method for boiler steam blowpipes. The method comprises the steps that small-pipe-diameter and large-pipe-diameter welding auxiliary structures are manufactured, pipelines are hoisted to the installation position for butt joint, the corresponding welding auxiliary structures are selected according to the pipe diameters so that pipe openings of the pipelines can be aligned and preliminarily welded and positioned, and final butt joint welding is completed after the auxiliary structures are dismantled. An auxiliary mounting and welding structure of the automatic screwing device is further manufactured, and the device enables a screwing driving mechanism to be in butt joint with a connecting bolt, a nut or an adjusting bolt by adjusting the positions of all parts and drives the screwing driving mechanism to rotate. According to the assembly welding device, the technical effects of quickly and accurately completing assembly welding of the boiler steam blowpipes and improving the construction efficiency and quality are achieved.