4973 results about "Straight tube" patented technology

The invention relates to the trailer and particularly serves for a folding trailer, comprising a rod assembly, four vertical pipes, a linkage sliding sleeve, a left-right folding assembly and a front-back folding assembly, the left and right folding assemblies include six cross tubes, and the front-rear folding assemblies include two cross straight tubes and two cross bend tubes, to ensure that the intersections of the second and third cross tubes, as well as the fourth and fifth cross tubes, are shifted down, as is the intersection of the second cross elbow and the second cross straight tube; The highest point of the constricted second, third, fourth, and fifth crossovers shall be lower than the horizontal line of the vertex-angle fastener, which ensures the highest point of the contracted folding trailer is level with the highest point of the vertex angle fixing piece not to raise the contracted height.

The invention belongs to the technical field of petroleum pipeline inner wall defect detection, and particularly relates to a petroleum pipeline inner wall defect detection system which comprises a pipe section division module, a wall thickness analysis module, a straight pipe section detection module and a bent pipe section detection module. Ultrasonic incident detection and eddy current scanning are synchronously carried out in areas with different wall thicknesses, eddy current and ultrasonic dual-mode detection are fused to generate a three-dimensional map containing defect boundary and depth information, a deposition risk area is divided on the basis of stress distribution of flow field simulation of a bent pipe section, an adaptive defect detection mode is adopted in different areas, and the defect detection accuracy of the bent pipe section is improved. Therefore, targeted detection of the defects of the inner wall of the petroleum pipeline is realized, missed identification is avoided to a great extent, and the completeness and reliability of defect detection can be greatly improved.

The invention provides a measurement correction and optimization arrangement method for an external clamping type ultrasonic flowmeter in a disturbed flow field, which comprises the following steps of: firstly, simulating the disturbed flow field in an actual pipeline in an industrial field by using computational fluid mechanics simulation software to obtain accurate flow field distribution near disturbance; secondly, performing integration on each ultrasonic propagation path grid point in different measurement modes to obtain in-pipe flow velocity simulation values and section average velocity at positions with different lengths away from a disturbance point, multiplying the values by the section area to obtain uncorrected flow and standard reference flow, and comparing the uncorrected flow and the standard reference flow to obtain flow deviation distribution; and then establishing a function relationship between flow deviation distribution and sensor installation arrangement, and obtaining a measurement path combination enabling the flow deviation to be insensitive to a sensor installation angle through data analysis, thereby correcting measurement results at different positions of the downstream of the disturbance pipeline through quantitative correction factors. According to the method, the measurement result with the measurement error lower than 2% can be obtained in the straight pipe section range of ten times of the pipeline diameter at the downstream of the elbow pipe in an industrial field.

The invention belongs to the technical field of welding equipment, and particularly relates to power pipeline welding equipment which comprises a workbench, bent pipe placing seats are symmetrically and rotatably mounted on the inner wall of the top of the workbench, connecting shafts are fixedly mounted at the bottoms of the bent pipe placing seats, and the outer walls of the connecting shafts are rotatably connected with the inner wall of the workbench; an adjusting gear is fixedly installed on the outer wall of the connecting shaft, and an automatic telescopic rod is arranged below the workbench. By means of the bent pipe placing base, the adjusting gear, the bent pipe fixing assembly and other structures, when a bent pipe and a straight pipe are welded, the bent pipe placing base rotates through cooperation of a toothed plate and the adjusting gear, then the angle of the bent pipe fixing assembly is adjusted, and the device is suitable for bent pipes of different angles; the bent pipe is fixed through the bent pipe fixing assembly, the effect of fixing the bent pipes at different angles is achieved, and the welding precision of the bent pipes and the straight pipes during welding is guaranteed.

A corrugated pipe connection device including: a corrugated stainless steel pipe; a straight pipe portion formed on each end of the corrugated stainless steel pipe; a connection member made of a metal and fitted to the outer periphery of the straight pipe portion; a synthetic resin sleeve fitted to the outer periphery of the straight pipe portion and having a flange; an expansion portion expanded from the end of the straight pipe portion; and a silicone packing having a ring portion coming into contact with the expansion portion, a protrusion portion protruding inwardly from the inner periphery of the ring portion to be inserted to the inside the straight pipe portion, and an insertion portion formed on the outer periphery thereof to surround the expansion portion therewith.

The invention discloses a robot welding pipeline flange displacement special clamp, and relates to the technical field of ship manufacturing equipment, the clamp comprises a processing table, a welding mechanical arm, a placing mechanism, two groups of pipeline clamping mechanisms, two groups of flange fixing mechanisms, a traction mechanism, a rotating platform and three screw rod sliding tables; the placing mechanism is slidably mounted in the middle of the machining table through the rotating platform, and the two pipeline clamping mechanisms are symmetrically slidably mounted on the two sides of the placing mechanism and can synchronously move and clamp pipelines. The two flange fixing mechanisms are symmetrically arranged on the two sides of the containing mechanism and horizontally move through a lead screw sliding table. The traction mechanism is connected with the machining table through a lead screw sliding table and can lock / unlock the rotating platform and drive the containing mechanism to move. The welding mechanical arm is in linkage with the clamp and can conduct welding along the butt joint axis. Multi-degree-of-freedom posture adjustment of a pipeline and a flange can be achieved, a straight pipe and a 0-90-degree bent pipe are matched, it is guaranteed that welding is in a horizontal butt joint state all the time, and the welding quality and efficiency are improved.

The invention provides a small-bending-radius pipe push-bending device and a using method thereof.The small-bending-radius pipe push-bending device comprises an upper supporting plate, a push rod, a hydraulic pressurizing pipe, a guide sleeve, a push-bending mold, a sealing joint, a sealing ring, a rubber ball, a pressure sensor, a hydraulic pushing cylinder, a movable ball joint and a hydraulic pressurizer. The using method comprises the following steps that firstly, a straight pipe needing to be machined is installed on the inner side of the push-bending mold; the guide rod is attached to the guide sleeve; a plurality of rubber balls are filled in the inner cavity of the straight pipe; a gap of an inner cavity of the straight pipe is filled through the hydraulic pressurizer; starting the press to apply downward pressure to the push rod; the liquid filling pressure is set to pressurize and support the interior of the pipe, and the pipe begins to be bent and formed along with descending of the push rod; and after 90-degree bending forming is completed, the liquid filling pressure is gradually increased for pressurization shaping. By adopting the mode of filling gaps with rubber balls and hydraulic pressure, the supporting pressure in the pipe is improved; and by adopting a differential friction form, the length of a linear section is increased, and meanwhile uniform stress in the bending process is achieved.

The invention relates to a cooling tower device for recovering heat from waste steam, which adopts three layers of transversely arranged heat exchange tube groups, realizes cascade recovery of heat energy of waste steam through communication of an air inlet and an air outlet, and is additionally provided with fins on the surfaces of heat exchange tubes to enhance the gas-liquid mass transfer efficiency. The core innovation lies in that a built-in mechanical cleaning mechanism is arranged, a driving assembly is in linkage with multiple sets of bidirectional adapters through a rotating shaft, brush rods distributed in the circumferential direction are driven to conduct high-frequency physical scraping on heat exchange pipes and fins, scale deposition is effectively restrained, and compared with traditional chemical cleaning, the shutdown maintenance time is shortened; the steam latent heat recovery rate can be increased, meanwhile, secondary pollution is avoided through a full-mechanical cleaning scheme, modular layout is adopted in structural design, interlayer fluid distribution of the heat exchange pipe set is achieved through a U-shaped pipe and a straight pipe, it is ensured that the resistance coefficient of the system is lower than that of similar equipment, and the device has remarkable energy-saving benefits in industrial scenes such as chemical engineering and metallurgy.

The present disclosure relates to an air conditioner pipe including: a corrugated stainless steel pipe; straight pipe portions formed on both ends of the corrugated stainless steel pipe to fit connection members thereto; a knitted mesh for inserting the corrugated stainless steel pipe thereinto; and a fixing ring member for fixing each end of the knitted mesh to the corresponding straight pipe portion, wherein each straight pipe portion is formed of a straight pipe member having a higher thickness than the corrugated stainless steel pipe and is welded to the corresponding end portion of the corrugated stainless steel pipe, so that the straight pipe portion is reinforced.

The invention discloses a flexible mechanical arm driving system for minimally invasive interventional surgery, a flexible mechanical arm comprises a hollow first sleeve assembly which is coaxially configured, the first sleeve assembly comprises an inner tube and an outer tube, the inner tube and the outer tube are thin-walled tubes, the inner tube is arranged in the outer tube in a penetrating manner, and the inner tube and the outer tube are fixedly connected at the far end part; the inner tube and the outer tube are each provided with a straight tube section at the near end and a deformation section at the far end, and the deformation sections can be bent and deformed when the inner tube is pushed / pulled. The driving system comprises an instrument assembly and a driving module assembly; a driving driven module is arranged in the instrument assembly, and the flexible mechanical arm is connected with the driving driven module; a driving driving module and a PCB control board are arranged in the driving module assembly, the driving driving module is in transmission connection with the driving driven module, and the driving module assembly is used for driving the flexible mechanical arm to do linear, rotating and bending movement. The driving device is used for driving the coaxial antagonism tubular flexible mechanical arm to achieve bending, rotating and linear motion, full-automatic control can be achieved, and the control accuracy and safety are high.

The invention discloses a mounting method for a water distribution ring pipe of an impulse turbine, and relates to the technical field of water turbines. Comprising the following steps: determining a runner pitch circle; the Z axis coincides with the circle center of the rotating wheel pitch circle; determining a rotating surface; determining a positioning surface; determining a positioning basis; setting a plurality of positioning lines; mounting a fork pipe, wherein the center of an outlet flange of the fork pipe is on a corresponding positioning line; determining the mounting angle of the fork pipe; the distance between the end surface of the outlet flange and the positioning surface is equal to a theoretical value; fixing the fork pipe; the steps are repeated until all the fork pipes are fixed; all straight pipes of the water distribution ring pipe are placed and fixed, and installation of the water distribution ring pipe is completed; when the straight pipe and the fork pipe are welded, due to existence of welding stress, the end face and the positioning face of the outlet flange need to be continuously measured to ensure that the end face and the positioning face of the outlet flange are parallel and the distance is equal to a theoretical value. The problem that the water distribution ring pipe is inconvenient to mount and measure due to the size and the weight of the impulse turbine can be solved.

The present invention relates to a hydrogen sulfide content detection device, and in particular to a hydrogen sulfide content detection device inside a biogas tank. Provided is a hydrogen sulfide content detection device inside a biogas tank that can be easily moved and has accurate detection results. A hydrogen sulfide content detection device inside a biogas tank includes a mounting block, rollers, a bracket, a detector, a pipeline, etc.; rollers are rotatably provided on the front and rear sides of the left and right sides of the lower part of the mounting block, a bracket is provided on the top of the mounting block, a detector is provided on the upper part of the bracket, and pipelines are connected to the left and right sides of the upper part of the detector, and the upper part of the pipeline passes through the top of the bracket. After the straight pipe moves downward, it enters the biogas tank, thereby extracting the gas inside the biogas tank for the detector to detect the hydrogen sulfide content, so that the detection result is more accurate. At the same time, because the device is easy to move, it is convenient for the staff to detect other biogas tanks in turn.

The invention discloses a welding device for automobile bent pipe fitting machining, and relates to the technical field of automobile pipe fitting machining, the welding device comprises a supporting base, a laser welding assembly and a driving mechanism used for driving the laser welding assembly to do circular motion, and a pipe fitting clamping mechanism is arranged on the supporting base; and the pipe fitting clamping mechanism comprises an elastic adaptive clamping mechanism and a straight pipe clamping mechanism. According to the device, firstly, the bent pipe fitting is centrally clamped in the vertical position through the two clamping plates, when the bent pipe fitting is clamped between the two clamping plates, the downward side of the bent pipe fitting directly extrudes the distributed sliding ejector rods, and the sliding ejector rods at different positions abut against the positions, with different curved surfaces, of the bent pipe fitting through resilience force of the corresponding supporting springs conveniently; and the lifting plate drives the other group of distributed sliding ejector rods to downwards press to the upward side of the bent pipe fitting, so that the bent pipe fitting can be conveniently clamped and positioned at positions with different curved surface degrees, the bent pipe fitting can be conveniently and stably butted with a clamped and fixed straight pipe fitting, and the welding operation can be conveniently and effectively completed.

The invention relates to the technical field of heat preservation and energy conservation, and particularly discloses a system for testing the heat conductivity coefficient of a pipeline heat preservation material under an engineering meteorological environment condition, which comprises a straight pipe test piece with calibration ends fixedly mounted at two ends, and a heat preservation covering material wrapped on the outer wall of the straight pipe test piece to form a pipe fitting to be tested; the ventilation hood is positioned in the sealed space; air pipes at the output end of the air conditioning system are all located in the sealed space, and air outlets of the air conditioning system directly face the ventilation hood. By simulating multi-parameter coupling working conditions such as in-pipe medium temperature gradient, external temperature and humidity / wind speed circulation and mechanical vibration, the heat conductivity coefficient of the material is dynamically corrected, whether the heat conductivity performance of each layer of material meets the standard specification or not is verified, and the rationality of the composite structure is quantitatively evaluated based on a thermal resistance network model. Data support is provided for optimizing the heat preservation layer combination mode and thickness design, and the problem of design deviation caused by the fact that a traditional method cannot reflect actual engineering working conditions is solved.

The utility model discloses soybean grinding equipment for making soybean flour, which comprises a base, a grinding device and a feeding table are arranged on the base, the grinding device comprises an upper crushing box and a lower discharging bin, the upper crushing box is connected with the lower discharging bin through a grinding part, a feeding hopper is arranged on the upper crushing box, and a discharging hopper is arranged on the lower discharging bin. A discharging opening is formed in the bottom of the side wall of the lower discharging bin, two crushing rollers are rotationally arranged in the upper crushing box, the grinding part comprises an upper conical hopper, a lower conical hopper and a straight pipe, a driving shaft is rotationally arranged in the lower discharging bin, and an upper grinding roller and a lower grinding roller are arranged on the driving shaft. Compared with the prior art, the soybean grinding device has the advantages that when soybeans are preliminarily ground, secondary grinding on ground soybean particles is realized through the elaborately designed upper grinding roller and lower grinding roller under the action of the upper conical hopper and the lower conical hopper, so that ground soybean powder is finer and smoother.

The negative pressure flexible ureteroscope sheath with the front end actively bent and telescopic comprises a sheath tube body, an operation channel is formed in the sheath tube body, an operation channel connector is fixed to the rear end of the sheath tube body, and a negative pressure suction connector communicated with the operation channel is fixed to one side of the rear end of the sheath tube body; the sheathing canal body is integrally formed by a telescopic bending section and a straight pipe section, pneumatic telescopic bending adjusting mechanisms are arranged on the upper side, the lower side, the left side and the right side of the telescopic bending section, and a pneumatic telescopic bending control mechanism is arranged at the rear end of the sheathing canal body. The front end of the flexible ureteroscope sheath can be telescopically adjusted and can be bent in multiple directions, the sheath tube can be telescopically adjusted at the rear end and is extremely easy and convenient to operate and adjust, and the sheath tube can increase the trafficability of calculi at the upper section of the ureter and prevent the ureter from being damaged.

The invention relates to the technical field of liquid level measurement, and particularly discloses a liquid level measuring instrument for a low-temperature container and a using method, and the liquid level measuring instrument comprises a gas phase pipe, a liquid phase pipe and a liquid level meter; the part, extending into the low-temperature container, of the liquid phase pipe comprises a straight pipe section arranged in an inner tank of the low-temperature container; the straight pipe section comprises a hole opening section provided with a first exhaust hole and a light pipe section without a hole, and the end of the light pipe section is a closed end. The drainage cylinder is arranged at the top of the side, close to the opening section, of the light pipe section, and the drainage cylinder is communicated with the light pipe section; the flow guide part is arranged in the flow guide cylinder, the width of the flow guide part is gradually increased from bottom to top, and a flow guide cavity is formed between the flow guide part and the flow guide cylinder; the sealing section is arranged on the side wall of the inner tank in a penetrating manner; one end of the sealing section is connected with the tapping section; the U-shaped air sealing section is arranged in the vacuum interlayer of the low-temperature container, one end is connected with the other end of the sealing section, and the other end is connected with the heating section. The accuracy and the stability of the differential pressure type liquid level instrument used for liquid level measurement of the low-temperature container can be improved.

The invention discloses a coating assembly suitable for a straight pipe pressure balance type expansion joint, and belongs to the technical field of expansion joints. The coating assemblies comprise the two working corrugated pipe coating assemblies and the balance corrugated pipe coating assembly, the working corrugated pipe coating assemblies are arranged on the outer ring of the first working corrugated pipe and the outer ring of the second working corrugated pipe, and the balance corrugated pipe coating assembly is arranged on the outer ring of the balance corrugated pipe. The coating assembly provided by the invention is composed of a plurality of groups of equally-divided circumferences, each group of equally-divided circumferences can be spliced and fixed to form a circumference shape, the coating assembly can be directly arranged on outer rings of a working corrugated pipe and a balance corrugated pipe in an existing structure, and on-site coating and repairing of the expansion joint are carried out in a mode that equipment is not stopped; economic losses caused by shutdown can be effectively reduced, the small wrapping corrugated pipe and the large wrapping corrugated pipe with the waveform parameters meeting the pressure balance requirement can be selected at the same time, and it is guaranteed that the wrapped expansion joint can meet the original performance requirement.

The present application discloses a welding gun for U-shaped dense tubes, which relates to the field of welding equipment, and includes a fuselage and a machine head. The machine head is arranged at one end of the fuselage, and a receiving cavity is formed in the machine head. The receiving cavity is arranged at an end away from the fuselage, and the U-shaped tube and two straight tubes connected to the U-shaped tube extend from the open end of the receiving cavity into the receiving cavity of the machine head, and the end wall of the machine head away from the fuselage abuts against the outer wall of the heat exchanger chassis, and a welding mechanism is arranged on one side of the machine head located in the receiving cavity, and the welding mechanism welds the plug-in joint of the U-shaped tube and the straight tube. The present application uses the fuselage to drive the machine head to move, and the machine head is arranged on a U-shaped tube and two straight tubes through the receiving cavity cover, so as to weld the plug-in joint of the U-shaped tube and a straight tube, thereby facilitating the welding of the dense tube bundle of the heat exchanger.

The invention discloses an air conditioner pipeline intelligent manufacturing and fault detection method based on digital twinning, relates to the technical field of data center infrastructure and fault detection, and aims to solve the problems of low construction efficiency, serious error accumulation, operation and maintenance logic faults and the like in a traditional process. The system is split into five functional modules through modular assembly design, a prefabricated straight pipe section and a combined section are combined with an equipment decoupling adjusting section to eliminate errors, and a standardized machining drawing is output; the quality is ensured through laser cutting, precise welding and galvanization processes, and high-precision field installation is achieved by combining paper number dual-mode guidance; a valve unique coding system is constructed based on BIM mapping, a two-dimensional code is generated to realize three-dimensional model calling and emergency guidance, a digital twin platform dynamically associates equipment control logic and a spatial position through a logic unit group, pushes hierarchical positioning guidance and links AR technology guidance operation when a fault occurs, and realizes full life cycle data tracing based on a block chain.

The invention is suitable for the technical field of offshore photovoltaic power generation platforms, and provides a novel pipeline cross-shaped connecting structure which comprises cross-shaped hoops, the two cross-shaped hoops are clamped in a staggered mode and used for connecting a straight pipe and two disconnected pipes, each cross-shaped hoop comprises two locking hoops and a side plate, the two locking hoops of the same cross-shaped hoop are arranged in a crossed mode, and the two locking hoops of the same cross-shaped hoop are connected through the side plate. Side plates are arranged on the side walls of the locking hoops; each of the two lower-end double-stand-column pipe fittings comprises two stand column inserting pieces and a connecting part, and the connecting part is used for connecting the two stand column inserting pieces; and each pedal connecting piece comprises a horizontal supporting plate and a matching hoop, and the horizontal supporting plates are arranged above the matching hoops. Therefore, good connection strength can be guaranteed, effective support is provided for the photovoltaic panel, the service life of the device is prolonged, the stand column can be primarily positioned, the matching precision of the stand column and other structures is improved, and the installation efficiency is improved.

The invention discloses a tea garden ditching and fertilizing all-in-one machine which adopts an electric crawler chassis which is independently driven on two sides, a fertilizing mechanism is located at the top of a whole machine frame, a ditching and earthing mechanism is located at the rear end of the whole machine frame, and the ditching depth can be adjusted by adjusting the length of a hydraulic telescopic rod; the control console is located at the front end of the whole machine frame and used for a driver to control the movement of the whole machine and the movement of all the mechanisms during driving, and meanwhile the ditching and fertilizing all-in-one machine for the tea garden can be controlled by selecting a wireless control mode under the condition that the road condition is simple. The ditching and fertilizing operation of the tea garden is more flexible; a wired and wireless combined remote control operation mode of ditching, fertilizing and earthing in the tea garden is realized; organic combination of the adjustable soil covering plate and the soil-splitting type fertilizing straight pipe is realized, and the soil crushing and covering link is more efficient; the ditching and fertilizing operation of the tea garden can be carried by a driver, and the complicated tea garden environment can be easily and timely adjusted in the operation process.

The utility model discloses a boiler water level gauge tube explosion automatic closing device which is arranged between a boiler drum and a glass tube water level gauge and comprises a boiler connecting flange, an automatic closing tube and a water level gauge connecting flange. The automatic closing pipe comprises a straight pipe section and a bent pipe section; the straight pipe section sequentially comprises a first concentric reducer, a sealing equal-diameter tee joint, a second concentric reducer and a reducer tee joint; the bent pipe section sequentially comprises a first long-radius elbow, a check valve, a second long-radius elbow and a sealing ball; the first long-radius elbow is connected with the sealing equal-diameter tee joint, and the second long-radius elbow is connected with the reducing tee joint. When a pipe explosion accident occurs, the device can be closed in time, a large amount of water and steam are prevented from being sprayed out, the influence of the accident is effectively reduced, the sweep range is reduced, and the accident loss is reduced. The utility model has the advantages that the water level gauge communicating pipe can be automatically closed after pipe explosion, the accident influence is reduced, and the loss is reduced.

The utility model discloses automatic bag making and bagging equipment which comprises a machine base and an electric control cabinet, the machine base is sequentially provided with a feeding device, a shaping vacuum cylinder and an automatic bagging device, the inner wall of the shaping vacuum cylinder is provided with a plurality of suction ports in the circumferential direction, and the suction ports are used for adsorbing the outer wall of a bag material so that the bag material can be kept in a cylindrical shape. The automatic bagging device comprises an inner mold for sleeving a bag material, a straight pipe conveying and grabbing device used for tightly sucking the bag material and sleeving the bag material on the inner mold is further arranged between the shaping vacuum cylinder and the bagging automation device. The bag sealing and cutting device is used for heat-sealing the end part of the bag material to form a bag body and cutting off the connection between the bag body and the bag material, and the bent pipe conveying, grabbing and releasing device is used for adsorbing the end part of the unprocessed bag material to keep the bag material in a cylindrical shape, so that the whole process does not need manual intervention, continuous and rapid bag making and bagging operation can be realized, and the production efficiency is greatly improved.

The invention belongs to the technical field of welding, and particularly relates to bent pipe welding equipment for metal pipe fittings, which comprises two workbenches, the top of the right workbench is connected with a placing frame with a triangular groove, the placing frame is rotatably connected with two rows of lower rollers at the triangular groove, and the top of the right workbench is connected with a vertical rod. A lifting plate driven by an electric push rod is slidably connected to the vertical rod, a pair of upper rollers is rotatably connected to the lifting plate, and a sliding rod sliding up and down is arranged on the front portion of the lifting plate. The bent pipe on the supporting disc is limited through the expanded air bag, a straight pipe is placed on the two rows of lower rollers, after the straight pipe is aligned with a pipe opening of the bent pipe, the upper rollers, the electric welding gun and the rolling wheels descend, the rolling wheels and the upper rollers make contact with the surface of the straight pipe, the relative positions of the rolling wheels and the upper rollers can adapt to the pipe diameter of the straight pipe under the action of the compression springs, adaptability is high, and welding efficiency is high. The rotating shaft, the supporting disc, the air bag, the bent pipe and the straight pipe integrally rotate, meanwhile, the electric welding gun conducts welding work, and the welding efficiency is high.

The utility model discloses a novel venturi mixer for mixing waste gas, which comprises a venturi tube, and the venturi tube comprises a contraction tube, a throat straight tube and an expansion tube which are connected in sequence; the four-way pipe comprises a main pipe and branch pipes which are symmetrically arranged on two sides of the main pipe and are communicated with the main pipe; the air suction port end of the main pipe air channel is connected with the air inlet end of the shrinkage pipe. An injection pipe is arranged in the throat straight pipe; the outer side of the expansion pipe is sleeved with a combustion-supporting pipe; the end, close to the throat straight pipe, of the combustion-supporting pipe is in welded sealing connection with the expansion pipe, the other end of the combustion-supporting pipe is an open end, a bundling opening is formed in the end of the open end, and first rotational flow blades are evenly arranged on the circumference of the inner wall of the bundling opening at intervals; the device is compact in structure, normal-pressure or low-pressure waste gas and combustion-supporting gas can be fully mixed, the mixing effect is good, supercharging equipment does not need to be additionally purchased, and the waste gas treatment cost of enterprises can be reduced.

The invention discloses metal elbow welding equipment, and relates to the technical field of elbow welding, the metal elbow welding equipment comprises a working table, supporting frames are symmetrically mounted at the bottom of the working table, a welding arm is arranged at the top of the working table, the metal elbow welding equipment further comprises a rubber pad, a supporting rod is fixedly mounted on the other side of the top of the working table, and the supporting rod is arranged on one side of the upper portion of the rubber pad; the positioning assembly is arranged on the top and one side of the rubber pad, the positioning assembly comprises a fixing plate and a fixing assembly, the fixing assembly is arranged on the upper portion of one side of the rubber pad, and the fixing plate is fixedly installed on the portion, located on one side of the rubber pad, of the top of the workbench; according to the elbow positioning device, the elbows can be accurately positioned, the centers of the elbows with different sizes and different bending angles can coincide with the rotating axis of a straight pipe, deviation generated when the elbows and the straight pipe are welded can be avoided, the welding quality is improved, operation of workers is facilitated, and convenience and practicability are improved.

The invention relates to the technical field of bent pipe machining equipment, and provides a bent pipe continuous turning machining device which is used for machining a straight pipe section into a bent pipe and comprises a pipe bending assembly and a first supporting and bending assembly, and the first supporting and bending assembly comprises a first main body and a second main body, the first supporting piece is arranged on the first main body in a sliding mode in the radial direction of the straight pipe section and is configured to be capable of being close to or away from the inner wall of the straight pipe section after sliding; one end of the extension rod is connected with the first main body, the other end of the extension rod extends out of the straight pipe section in the axial direction of the straight pipe section, and the extension rod is provided with a penetrating channel; the operating rod is rotationally arranged in the penetrating channel, one end of the operating rod extends out of the penetrating channel, and the other end of the operating rod is configured to drive the first supporting piece to move to be close to the inner wall of the straight pipe section after rotating. By means of the technical scheme, the technical problem that in the prior art, when pipe bending equipment conducts pipe bending machining, stripes, wrinkles and bending are prone to occurring on products is solved.

The invention relates to the technical field of refrigeration air conditioner equipment, in particular to an automatic production system for a refrigeration air conditioner assembly and a working method of the automatic production system, the automatic production system comprises a workbench, a feeding belt, a feeding channel, a bending part and a pushing rod, a plurality of groove wheels are arranged in the feeding channel, and the groove wheels are used for conveying straight pipe bodies into the bending part; the bending part comprises a pair of bending movable wheels and a pair of bending fixed wheels, the bending movable wheels and the bending fixed wheels are both provided with grooves matched with the straight pipe body, and the straight pipe body moves to the position between the pair of bending movable wheels and the bending fixed wheels. The pair of movable bending wheels do circular motion with the fixed bending wheel as the axis, the moving directions of the pair of movable bending wheels are opposite, and the straight pipe body is bent into a U-shaped pipe; a discharging slide way is arranged on one side of the workbench, a pair of pushing rods is arranged, and the pushing rods are used for pushing a formed U-shaped pipe out of a bending part to the discharging slide way.

The invention relates to a closestool blow-down device and a closestool. The closestool blow-down device comprises a blow-down box, wherein the blow-down box is provided with a containing cavity and comprises a dirt input end and a dirt output end which are communicated with the containing cavity; the sewage discharge straight pipe comprises a first working state which tilts upwards in the horizontal direction to realize water seal of the closestool and a second working state which extends towards the rear part of the closestool to realize sewage discharge of the rear part of the closestool; the driving device is installed on the sewage discharging box and connected with the sewage discharging straight pipe, and the driving device is arranged to be capable of driving the sewage discharging straight pipe to turn over so as to switch the first working state and the second working state.