302 results about "Ductile iron pipe" patented technology

The invention discloses a nodular cast iron pipe continuous annealing furnace temperature distribution optimization control system and method, and belongs to the technical field of temperature control, and the system comprises a temperature detection module, a data processing module, a control module and a fault diagnosis module; the temperature detection module is used for collecting temperature data in the nodular cast iron pipe annealing furnace in real time; the data processing module is used for preprocessing and analyzing the collected temperature data and constructing a temperature distribution model; the control module comprises a temperature optimization unit and an energy optimization unit; the temperature optimization unit is used for calculating the temperature adjustment amount according to the real-time temperature distribution condition in the furnace in the length direction, the radial direction and the circumferential direction, and formulating a partition heating and local compensation strategy; the energy optimization unit is used for dynamically adjusting the heating power according to the change of the production takt, and generating a dynamic heating strategy; the fault diagnosis module is used for monitoring the operation state of the nodular cast iron pipe annealing furnace in real time and conducting fault detection.

The invention belongs to the field of application of an image processing technology and an automatic detection technology, provides a nodular cast iron pipe white sprayed code integrity detection method and system, and aims to solve the problems of low nodular cast iron pipe white sprayed code recognition accuracy, poor environmental adaptability, low processing speed, image splicing and the like in industrial production. In combination with an optimized image preprocessing technology, an advanced feature point detection and matching technology and an image fusion algorithm are applied to solve the problem of image seamless splicing. By adopting the method provided by the invention, the error and time cost in a manual identification process can be greatly reduced through prediction, and the automation and intelligence level of a production line is improved. The production efficiency can be improved, the product quality can be ensured, and the increasing industrial automation requirement is met. Finally, the system becomes an important tool for improving the product quality and the production efficiency of nodular cast iron pipe production enterprises.

The utility model relates to the technical field of nodular cast iron pipes, in particular to a socket type pipeline connector which comprises a socket, a spigot and a sealing piece, the socket comprises an annular sealing groove, an annular limiting part and a deflection groove which are coaxial, the annular limiting part separates the annular sealing groove and a conical groove, an annular retaining groove is formed in the annular sealing groove, and the deflection groove is formed in the spigot. An annular containing groove is formed by the distance between the annular retaining groove and the annular limiting part. The maximum-diameter port of the conical groove is connected with the annular limiting part; the inner diameter of the annular limiting part is smaller than the maximum inner diameter of the conical groove; the sealing piece comprises a hard rubber ring and a soft rubber ring, the outer ring of the hard rubber ring is arranged in the annular retaining groove, the outer ring of the soft rubber ring is tightly attached to the annular containing groove, the inner diameter of the hard rubber ring and the inner diameter of the soft rubber ring are smaller than the inner diameter of the annular limiting part, and the outer wall of the inserting opening is attached to the inner ring of the soft rubber ring in a sealed mode. Under the condition that the insertion depth of an insertion opening of an existing socket and spigot type pipeline connector into a deflection groove is the same, the deflection angle of the insertion opening in the deflection groove can be effectively increased.

The invention discloses a nodular cast iron pipe machining device, and relates to the technical field of nodular cast iron pipe production, and the nodular cast iron pipe machining device is characterized in that an inner supporting mechanism is prevented from falling off due to the fact that the upper side and the lower side are not fixed due to placement of an iron pipe through a limiting rod and a rotating rod; the complexity and the labor intensity of manual operation are reduced through the self-adaptive inner supporting function, an operator only needs to conduct simple equipment operation and monitoring, the working difficulty and the labor intensity are reduced, the inner supporting plate is made to rotate through the driving disc, and therefore the iron pipe is made to rotate; the polishing mechanism polishes the outer circumferential face of the iron pipe from bottom to top through the reciprocating screw rod, the iron pipe is not fixed through the power gear, the rotating sleeve and the connecting rod after polishing is completed, the iron pipe is conveniently output, contact between an operator and equipment and the iron pipe in the polishing process is reduced, and the polishing efficiency is improved. And the safety accident risk caused by misoperation is reduced.

The invention relates to the technical field of nodular cast iron pipe machining, in particular to a nodular cast iron pipe water-cooling metal type centrifugal machine of an electric drive system. The device comprises a fan-shaped ladle overturning system, a pouring launder, a pipe mold and a pipe drawing device which are sequentially connected, rotation of the pipe mold is controlled by a pipe mold rotating system, and the pipe mold is arranged on a pipe mold walking system so as to reciprocate between the pouring launder and the pipe drawing device through the pipe mold walking system; according to the nodular cast iron pipe water-cooling metal mold centrifugal machine of the electric driving system, the flow of the metal liquid in the first flow guide plate is sensed through the telescopic control mechanism, when the performance of the driving motor is in a normal state, the pouring runner is controlled to be in an original state, flowing intervention on the metal liquid is avoided, and the qualification rate of pipes is guaranteed. And when the performance of the driving motor is reduced, the pouring runner is automatically extended, so that the metal liquid is prevented from flowing to the ground, and meanwhile, the influence on the subsequent movement of the pipe die is also avoided.

The utility model relates to a nodular cast iron pipe jacking machining rib plate welding system which comprises a nodular cast iron pipe, a pushing flange and a rib plate, and when the nodular cast iron pipe enters a corresponding station of the nodular cast iron pipe jacking machining rib plate welding system, the pushing flange is installed; the automatic welding device comprises a supporting device and a clamping mechanical arm, the clamping mechanical arm is a six-degree-of-freedom industrial robot, a magnetic attraction tool is arranged on a tail end executor of the clamping mechanical arm, and the magnetic attraction tool transports the rib plate to a to-be-welded position; the welding mechanical arm is a six-degree-of-freedom industrial robot and is used for welding the rib plate, so that the rib plate is fixedly connected with the nodular cast iron pipe and the pushing flange respectively; compared with the prior art, the nodular cast iron pipe rib plate welding device has the beneficial effects that the nodular cast iron pipe rib plate welding work is achieved through cooperation of the clamping mechanical arm, the supporting device and the welding mechanical arm.

The utility model relates to a nodular cast iron pipe cement lining internal grinding walking mechanism which comprises a grinding assembly. The walking frame is of a rigid structure with the side face in an N shape, the two ends fixed, the lower portion provided with a gap in the travel direction of the nodular cast iron pipe cement lining internal grinding walking mechanism and the upper portion provided with a plane. The trolley assembly comprises a trolley base, a connecting arm and an adjusting arm, the trolley base, the connecting arm, the adjusting arm and a connecting shaft form a closed annular structure, and the trolley base, the connecting arm, the adjusting arm and the connecting shaft are in a wrapping posture and embraced on the walking frame; the driving device is located on the trolley base and provides power for movement of the trolley base; compared with the prior art, the trolley assembly has the advantages that the trolley base is stabilized on the walking frame in a tree-embracing mode through the connecting arm, the adjusting arm and the connecting shaft, the stability of the trolley assembly in the whole movement process is improved, the grinding quality is improved, and adverse factors such as vibration generated by grinding are avoided.

The invention provides a centrifugal casting method, device and equipment for a nodular cast iron pipe and a medium, and relates to the technical field of centrifugal casting. The method comprises the steps that analog simulation is conducted on the solidification structure in the centrifugal casting process of the nodular cast iron pipe, and a simulation result of the solidification structure is obtained; aiming at the simulation result of the solidification structure, fitting a mapping relation between each casting process parameter and the grain size of the solidification structure in a plurality of casting process parameters influencing the solidification structure; based on the mapping relation between each casting process parameter and the grain size of the solidification structure, casting process values corresponding to the multiple casting process parameters are determined; and performing centrifugal casting on the nodular cast iron pipe based on the casting process value. By the adoption of the scheme, the problems that due to improper selection of relevant casting process parameters, the solidification structure of the nodular cast iron pipe has the defects of air holes, impurities, shrinkage porosity, shrinkage cavities, hot cracks and the like can be solved, and therefore the quality of the produced nodular cast iron pipe is improved.

The invention discloses a nodular cast iron pipe packaging and warehousing system and stacking equipment applying the system, relates to the technical field of nodular cast iron pipe packaging, and solves the technical problem that an existing nodular cast iron pipe packaging and warehousing technology is insufficient in the aspects of transportation, sorting, stacking and system collaboration.The nodular cast iron pipe packaging and warehousing system comprises a conveying mechanism, and a sorting mechanism is arranged on the right side of the conveying mechanism; the front surface, the right side and the back of the sorting mechanism are each provided with a pipe conveying mechanism, an automatic lifting and batten adding mechanism and a transferring mechanism. Through cooperative work of the mechanisms, the equipment can adjust the supporting height according to the pipe diameter, work conflicts are avoided in combination with an intermittent discharging component, stable and efficient transportation is achieved, and the sorting mechanism collects codes through an industrial camera and is matched with a clamping and discharging component to accurately sort and transport pipe fittings; the whole system is coherent in working process and sufficient in early-stage preparation, has a manual mode and an automatic mode, achieves intelligent control, improves the production efficiency and facilitates data management and source tracing.

The application discloses a nodular cast iron pipe with a composite coating and belongs to the technical field of metal corrosion prevention, comprising a nodular cast iron pipe base body, a composite outer coating coated on the outer surface of the nodular cast iron pipe base body and an inner coating closely attached to the inner surface of the nodular cast iron pipe base body, characterized in that the composite outer coating comprises an alkali-activated gel layer and a zinc-based coating, the zinc-based coating is arranged between the outer surface of the nodular cast iron pipe base body and the alkali-activated gel layer, the alkali-activated gel layer is an alkali-activated slag fly ash corrosion-resistant gel material, and the zinc-based coating is one or more of a pure zinc coating, a zinc-aluminum alloy coating or a zinc-rich coating layer. The alkali-activated gel layer provided by the application is coated on the inner or outer surface of the pipe and provides further corrosion protection for the nodular cast iron pipe, so that the pipe can be used in extremely harsh construction environments, and has extremely strong weather resistance in acidic soil and overhead fields.

The present invention provides an axial transportation device for socket and spigot pipes, which comprises a plurality of sets of supporting wheels. The sets of supporting wheels are composed of supporting wheel mechanisms arranged perpendicular to the axis of the socket and spigot pipes. The supporting wheel mechanisms are arranged on both axial sides of the socket and spigot pipes during transportation. The supporting wheel mechanisms are active supporting wheel mechanisms or driven supporting wheel mechanisms. The set of supporting wheels includes one active supporting wheel mechanism and one driven supporting wheel mechanism, or includes two active supporting wheel mechanisms. In the set of supporting wheels of the present invention, the supporting wheels rotate in place, and the rotation speed of the supporting wheel body and the angle of the supporting wheel body can be adjusted to match the rotation speed and the axial moving speed of the ductile iron pipe, improving the transportation stability of the ductile iron pipe. At the same time, the operation time and operation efficiency during the cleaning and spraying of the ductile iron pipe are improved.

The invention discloses a remote centralized control system for a cast pipe production line, which comprises an operation interface module, an intelligent parameter adaptation module, a monitoring module and a data management module, and is characterized in that the operation interface module is based on Siemens WinCC software, and the intelligent parameter adaptation module applies a button C action code technology in the Siemens WinCC software; the whole spheroidal graphite cast pipe production line is connected into a centralized control system, operators perform remote operation in a centralized control room in a unified manner, the operation interface module is partitioned according to the production process, the operation state, the parameter setting range and the real-time parameters of equipment in each link are clearly displayed, and the operators can quickly acquire key information through different colors, icons and text descriptions, so that the production efficiency is improved. Information transmission is changed from manual transmission to system real-time sharing, communication between posts is free of any difficulty and obstruction, communication is rapid and effective, problems of each working section can be rapidly transmitted and efficiently processed, and the production efficiency and the product quality are greatly improved.

The present invention discloses a flaw detection device and method based on the production of ductile iron pipes, and relates to the technical field of ductile iron pipe detection. The present invention includes a ductile iron pipe arranged on a detection platform, and also includes: a positioning unit, which is arranged on a processing box 1 and includes a driving component and a positioning component; a flaw detection unit, which is arranged on the detection platform and includes a synchronization component and a detection component, and a processing box 1 and a processing box 2 are arranged on the detection platform. The advantage is that the present invention can realize synchronous visual flaw detection of the inner and outer walls of the ductile iron pipe without changing the positioning state of the ductile iron pipe, and can realize comprehensive detection of the inner and outer walls of the ductile iron pipe. At the same time as the visual detection, the collision knocking rod can be driven to intermittently automatically knock on the ductile iron pipe to generate vibration waves. At the same time, the ripple detector can be used to realize the collection and detection of the vibration waves, so that the internal flaw detection of the ductile iron pipe can be realized, and the detection range is wider.

The utility model relates to a butt joint installation device for nodular cast iron pipes, one end of each nodular cast iron pipe is fixedly provided with a horn mouth, and the butt joint installation device comprises a fixing assembly which is of a closed annular structure, is installed on the nodular cast iron pipes in a buckled mode and is suitable for fixing the nodular cast iron pipes; the supporting assembly is located on one side of the horn mouth of the nodular cast iron pipe and suitable for bearing the adjacent nodular cast iron pipes for butt joint installation; the telescopic part is mounted between the fixing assembly and the supporting assembly and suitable for adjusting the distance between the fixing assembly and the supporting assembly. The butt-joint installation device comprises a fixing assembly, a supporting assembly and a telescopic piece, the fixing assembly sleeves one end of the nodular cast iron pipe and is suitable for fixing the nodular cast iron pipe, the supporting assembly is located at the other end of the nodular cast iron pipe, and the top end face of the supporting assembly is flush with the inner wall of the horn mouth and is suitable for bearing the adjacent nodular cast iron pipes for butt-joint installation. Alignment is fast, installation is convenient, and firmness and stability are achieved; and the device is suitable for nodular cast iron pipes of various sizes and wide in application range.

The invention relates to the technical field of nodular cast iron pipe jacking construction equipment, in particular to a hydraulic device for nodular cast iron pipe jacking construction, which comprises a mounting frame, a support plate, a hydraulic cylinder, a hanger, a traction mechanism and a control assembly. The supporting plate is slidably mounted on the mounting frame, the fixed end of the hydraulic cylinder is fixedly mounted on the mounting frame, the movable end of the hydraulic cylinder is fixedly connected to the supporting plate, and when the hydraulic cylinder works, the supporting plate is pushed to slide on the mounting frame; the hanging piece is mounted on the mounting frame and is used for hanging the mounting frame on a nodular cast iron pipe socket to be jacked; the traction mechanism is installed on the supporting plate and used for fixing an insertion opening of a nodular cast iron pipe to be jacked to a bellmouth where the nodular cast iron pipe is installed. The control assembly is installed on the installation frame and used for controlling the operation state of the hydraulic cylinder. The large-diameter nodular cast iron pipe jacking device has the effect of improving the jacking construction efficiency of the large-diameter nodular cast iron pipe.

The utility model discloses a quick mounting tool for a large-diameter nodular cast iron pipe, which belongs to the technical field of mounting tools and comprises a square rod, a cushion block is fixedly assembled on the outer side of the square rod, a long rod is slidably connected to the inner wall of the square rod, a round rod is fixedly assembled on one side, far away from the square rod, of the long rod, and a steel plate is fixedly assembled on the outer edge of the round rod. An inserting rod is driven to move by pulling a disc, then the bottom end of the inserting rod can be conveniently moved out of the inner wall position of an assisting rod, the ends, away from a rotating block, of the two assisting rods can be pulled out from the middle position of a first fixing plate and a second fixing plate, and therefore a worker can rotate the two assisting rods to drive the device and the nodular cast iron pipe to rotate; the power assisting rod can be folded and stored when not in use, so that space occupation is reduced, the power assisting rod can be conveniently held by multiple persons together to exert force to rotate, the problems that time and labor are wasted during installation due to insufficient strength of a single person, and the installation tightness is insufficient are solved, and the power assisting rod can be folded and stored when not in use, so that the space occupation is reduced.

The utility model belongs to the field of municipal engineering, and provides a pipeline socket and spigot joint reinforcing and protecting device which comprises two deflection protecting pieces. Each deflection protecting piece comprises a front extending part, a protruding part and a rear extending part which are sequentially connected. The two deflection protection pieces are symmetrically arranged and jointly form a sleeve structure, and the sleeve structure is coaxially arranged on the outer side of a pipeline socket and spigot joint in a sleeving mode. When the device is used, the water leakage point of the pipeline is determined firstly, then a working face meeting the installation requirement of the device is excavated at a connector, after the pipeline is corrected in place, the device is installed at the position of the connector, then a pipe bottom foundation is filled, and soil covering on the pipe side and the pipe top is completed. The device can reinforce and protect the deformed and fractured nodular cast iron pipe joint under the condition of not stopping the normal operation of the pipe network, can realize quick repair, reduce the excavation workload of a foundation pit, reduce the social influence caused by the stop operation of the pipe network and reduce the adverse influence on the environment, is simple and feasible, and can ensure the quality.

The invention relates to the technical field of pipeline installation, and discloses a nodular cast iron pipe rapid installation hydraulic trolley and a construction method.The nodular cast iron pipe rapid installation hydraulic trolley comprises an installation frame, a connecting rod is rotationally connected to the interior of the installation frame, rollers are fixedly connected to the outer wall of the connecting rod, and a first telescopic rod is fixedly connected to the outer wall of the left side of the installation frame; an anti-skid assembly is fixedly connected to the outer wall of the right side of the first telescopic rod, a supporting assembly is fixedly connected to the upper surface of the anti-skid assembly, a pushing assembly is fixedly connected to the outer wall of the supporting assembly, an expanding assembly is fixedly connected to the outer wall of the pushing assembly, and fixing assemblies are fixedly connected to the outer walls of the two sides of the mounting frame. The hydraulic cylinder and the telescopic rod cooperate to push the expanding assembly to enter the pipeline, the motor is combined to drive a meshing mechanism of a fluted disc and a sliding block, the inner wall of the pipeline is evenly expanded and positioned by the mounting pad, the trolley flexibly moves along the axis of the pipeline through the rollers and the universal wheels, the manual adjusting time is effectively shortened, and the mounting error is reduced.

The utility model discloses a pressure spraying device for prolonging the service life of a nodular cast iron pipe cold mold method pipe mold, which belongs to the field of centrifugal casting and comprises a stirring mechanism, a discharge port of the stirring mechanism is connected with a feed port of a high-pressure air type power mechanism, the power mechanism is provided with a high-pressure air inlet, and the bottom of the power mechanism is connected with a material pipe. The material pipe is connected with a rotatable spray head mechanism, the spray head mechanism comprises a fan-shaped nozzle connected with the material pipe, and the fan-shaped nozzle is further connected with a high-pressure air inlet of a power mechanism through an air pipe. According to the utility model, paint can be sprayed at the bell end of the cold-mold-method pipe mold in a casting gap, the paint is dried by virtue of waste heat of the pipe mold, and meanwhile, the nozzle can spray high-pressure air to purge the interior of the pipe mold, so that the service life is effectively prolonged.

The utility model discloses a semi-X-shaped rubber ring sealing structure of a nodular cast iron pipe, and relates to the technical field of socket fit sealing of nodular cast iron pipes. The sealing ring comprises an integrally-formed semi-X-shaped rubber ring, one end of the periphery of the rubber ring is provided with a protruding annular positioning clamping block, the other end of the periphery of the rubber ring is provided with a first sealing part, and a straight part is arranged between the first sealing part and the positioning clamping block; the end, close to the positioning clamping block, of the inner circumference of the rubber ring is an inclined part, an extrusion part is arranged in the middle of the inner circumference, and the vertical distance from the inner circumference of the rubber ring to the straight part is gradually increased from the end where the positioning clamping block is located to the extrusion part. A second sealing part is arranged at one end, far away from the positioning fixture block, of the inner circumference of the rubber ring, one side of the section of the second sealing part and the first sealing part is arc-shaped, and arc-shaped grooves are formed between the second sealing part and the first sealing part and between the second sealing part and the extrusion part respectively; the nodular cast iron pipeline is reasonable in section appearance design, the sealing reliability of the nodular cast iron pipeline in certain high-pressure, high-temperature and dynamic environments is improved, and the requirement for high-temperature hot water conveying in the heating industry can be met.

The application relates to the technical field of nodular column iron pipe processing, and discloses a self-anchored pipe socket welding ring welding device based on construction and an operation method thereof, which comprises a push plate, a self-anchored nodular cast iron pipe and a copper hoop, one end of the top of the push plate is fixedly connected with an electric telescopic table, the output end of the electric telescopic table is fixedly connected with a mounting frame, and the inner wall of the mounting frame is fixedly connected with a first motor. The welding gun arranged at the top of the assembling block reciprocatingly performs slow overlay welding between the two copper hoops under the slow rotation of the first motor, and the application further solves the problem that, in the use process of the traditional self-anchored pipe socket welding ring welding device, when special-sized pipelines are needed, the self-anchored nodular cast iron pipe often needs to be taken to a designated processing factory for processing, which is not only troublesome for the back-and-forth transportation, but also difficult to timely perform secondary processing on the pipe according to the construction demand, so that the pipeline throughness cannot be guaranteed.

The invention belongs to the technical field of nodular cast iron pipe machining, and particularly relates to a nodular cast iron pipe product based on composite material outer spray paint and a manufacturing process. The manufacturing process comprises the following steps that S1, thermal refining, inoculation and spheroidizing are conducted on molten metal; s2, casting of molten metal and cooling of the nodular cast iron pipe; s3, annealing heat treatment; s4, shot blasting treatment is conducted on the outer wall of the nodular cast iron pipe; and S5, the outer wall is subjected to two-layer cross winding with the included angle of + / -50-70 degrees with the straight section of the pipe body, and finally, after one-layer annular winding perpendicular to the straight section of the pipe body is conducted, outer surface resin curing, lining layer coating and paint spraying are conducted. According to the method, the anti-corrosion treatment is carried out twice, the service life of a cast pipe product under the severe condition is guaranteed through multi-coating anti-corrosion, the service life of the cast pipe is prolonged, and consumption of steel resources is greatly reduced.

The utility model relates to the technical field of lifting appliances, in particular to a lifting appliance for a nodular cast iron pipe, which comprises a lifting appliance rod, a mounting block b, a reinforcing component and a lifting component, a mounting block a is connected above the lifting appliance rod, two ends above the mounting block a are respectively connected with a splicing rod a, the splicing rod a is provided with a through hole a, the mounting block a and the inner walls of the two splicing rods a form a mounting cavity a, a connecting piece a is connected above the mounting cavity a, and the connecting piece a is connected with a lifting hook a and is used for being connected with lifting machine equipment; the mounting block b is connected below the lifting appliance rod; the mounting block b is connected with a splicing rod b, and the splicing rod b and the splicing rod a are the same in structure. According to the lifting appliance for the nodular cast iron pipe, a proper connecting position can be conveniently selected according to a nodular cast iron pipe body lifting point, the rationality of a lifting mode is improved, the safety and stability of nodular cast iron pipe body lifting operation are improved, deformation or damage of the nodular cast iron pipe in the lifting process is avoided, and the lifting cost and risk of the lifting appliance for the nodular cast iron pipe are reduced.

The invention discloses a pretreatment intelligent machining device for a nodular cast iron pipe inner wall spraying procedure, and relates to the technical field of nodular cast iron pipe inner wall machining and grinding devices. The pretreatment intelligent machining device for the nodular cast iron pipe inner wall spraying procedure comprises a base, the top of the base is fixedly connected with an adjusting supporting beam, the interior of the base is fixedly connected with a rotating fixing mechanism, the interior of the adjusting supporting beam is rotationally connected with a driving mechanism, and the driving mechanism comprises a first rotating lead screw. According to the pretreatment intelligent machining device for the nodular cast iron pipe inner wall spraying procedure, a first sliding block is arranged, and after a fourth motor is started, a conical push block pushes the first sliding block to move, so that the inner wall of a nodular cast iron pipe is conveniently and preliminarily ground by a spherical first grinding block; and large dynamic load fluctuation caused by unevenness of the inner wall during finish machining is avoided, so that the risks of vibration and deformation in the machining process are reduced, and the overall machining efficiency of the device is improved.

The utility model provides an automatic ladle slag removal device for nodular cast iron pipe production, and relates to the technical field of nodular cast iron pipe production, the automatic ladle slag removal device comprises a hoisting assembly and a bearing feeding and discharging component, the bearing feeding and discharging component assembled by bolts is arranged on the inner side of the lower portion of the hoisting assembly, and a cleaning mechanism is arranged at the output end of the inner side of the hoisting assembly. The feeding and discharging bearing part comprises an annular sleeve seat, a hinged movable strip, a ladle cylinder, an output nozzle, a hinged base, a pull rod, a hydraulic telescopic arm and an electric hinged seat; the annular sleeve seat is arranged on the inner side of the lower part of the hoisting assembly; according to the cleaning device, the first matching plate at the output end of the first hydraulic cylinder is mainly utilized to move into a ladle cylinder, and dirt which is difficult to scrape can be scraped through rotation of the rotating motor, the rotating sleeve, the servo motor, the vertical cleaning knife and the transverse cleaning knife; and an electromagnetic suction plate on one side of the second anastomosis plate can adsorb the cleaned iron dirt, so that the cleaning efficiency of the equipment is improved.

The invention discloses a large-deflection-angle ductile cast iron pipeline flexible connector which comprises a bearing head and a plug, the connector position of the bearing head is a spherical bell mouth, a spherical ring is installed in the spherical bell mouth, the plug is installed in the spherical ring and connected with the bearing head, and the spherical ring is matched with the spherical bell mouth at the joint of the plug and the bearing head. According to the T-shaped connector, the connector allowable deflection angle is increased, the insertion depth of the plug is increased through the spherical ring and the spherical bellmouth, the larger deflection angle and length compensation are achieved compared with a common T-shaped connector, and the occurrence of pipeline water leakage accidents caused by uneven settlement in mountainous regions, marshlands and earthquake-prone regions is avoided by increasing the deflection angle.

The utility model relates to the technical field of nodular cast iron pipe fittings, in particular to a sand cleaning device suitable for the surface of a nodular cast iron pipe fitting, which comprises a sand tank, a sand cleaning station arranged in the middle of the sand tank, preparation stations arranged on two sides of the sand cleaning station, and two groups of rotatable nodular cast iron pipe fitting rotating clamping tables, the two nodular cast iron pipe fitting rotating clamping tables can be horizontally moved as a whole and can be arranged at a sand cleaning station and one of the preparation stations correspondingly, and the upper portion of the sand cleaning station fixedly communicates with a sand cleaning box with inlets and outlets formed in the bottoms of the two sides; the nodular cast iron pipe fitting sand removing device is simple in structure, sand on the inner wall and the outer wall of a nodular cast iron pipe fitting can be conveniently and continuously removed, the sand removing energy consumption is reduced, the occupied area is reduced, the safety performance is further improved, and abrasion to the nodular cast iron pipe fitting is reduced.

The invention discloses a preparation method of a low-temperature annealed water-cooled centrifugal ductile iron pipe, and relates to the technical field of ductile iron pipe casting. The method comprises the following steps: S1 molten iron smelting and tempering; S2 spheroidization and inoculation of molten iron: pouring the qualified molten iron smelted in step S1 into a spheroidizing bag, adding ferrosilicon alloy for inoculation, and spraying passivated granular magnesium into the spheroidizing bag to complete the spheroidization and inoculation of the molten iron; S3 molten iron pouring and cooling: the molten iron after spheroidization and inoculation is poured into a pipe mold with insulation, an inoculant is added simultaneously, the pipe mold is rotated, and the outer wall of the pipe mold is cooled by cooling water, and when the pipe mold is cooled to 500-600°C, it is pulled out of the pipe mold and transported to the front of the annealing furnace; S4 residual sand spraying and heat treatment: the residual sand in the cast iron pipe is cleaned up, sent to the annealing furnace, and annealed in turn through a heating section, a heat preservation section and a slow cooling section. The invention solves the problems of high energy consumption and large deformation and dents of cast iron pipes in the annealing furnace.

The present invention discloses a control device for a metering ladle for hot-molding centrifugal casting of ductile iron pipes, which relates to the technical field of metering ladle control devices. The device comprises a base plate, four support blocks evenly mounted on the top of the base plate, a connecting rod mounted on the side of each two corresponding support blocks close to each other, a first weighing sensor mounted on the top of each of the two connecting rods, a second weighing sensor mounted on the top of each of the two support blocks, and a clamping block mounted on the top of each of the two second weighing sensors. In the present invention, when in use, a roller is placed on a rail scale, and a servo controller on the servo hydraulic cylinder activates the servo hydraulic cylinder, pulling the connecting plate, causing the clamping plate to pull the driving wheel to move, and the driving wheel moves to pull the chain. Under the cooperation of the first sprocket and the second sprocket, one end of the chain pulls the connecting base, and under the cooperation of the clamping block and the round rod, the molten iron ladle rotates around the round rod to pour out the molten iron.

The utility model provides a DN350-800 nodular cast iron pipe wall thickness multi-surface detection device, which comprises a tug device, one side of the tug device is provided with a thickness measuring device, the tug device comprises a rotating disc and a base, the rotating disc is rotatably connected with the base, the rotating disc controls a first motor to rotate through a controller, and meanwhile, the thickness measuring device is connected with the thickness measuring device. A weighing device and a pushing rod are arranged in the rotating disc, a cast pipe is lifted and weighed, the thickness measuring device comprises a fixed rod and a movable rod, and a first laser displacement sensor arranged on the fixed rod is matched with a second laser displacement sensor arranged on the movable rod to measure the thickness of the cast pipe. According to the utility model, the tug device is installed, the cast pipe is moved directionally and at a fixed point, the rotating disc enables the cast pipe to rotate at a specific angle, the function of annularly detecting the wall thickness of the cast pipe is met, the lifting device and the weighing device are installed to meet the weighing function, wall thickness detection data are compared, the pipe weight is matched, and the quality of the cast pipe is judged more accurately.