806results about "Blast guns" patented technology

The invention provides a method for sand blasting and paint removal through a shell medium, and belongs to the field of coating treatment.The method comprises the steps that the type of the shell medium is determined, shells are wild mountain shell peach shells, the shells are smashed and screened to obtain shell particles with the preset size, and the shell particles are loaded into a press-in type sand blasting machine; determining process parameters of sand blasting paint removal, and removing paint on the surface of the part according to the process parameters; different paint removers are selected for softening the paint-removed surface according to different materials, and after a paint layer is softened, the paint removing coating and the paint removers are used; the distance between a press-in type sand blasting machine nozzle filled with the shell particles and the paint removal surface is kept at a preset distance, and the nozzle is uniformly moved to blow off a paint layer on the surface of the part; and after paint removal is completed, shell particles remaining on the surfaces, gaps and small holes of the parts are blown away through compressed air.

The utility model discloses a spray gun mechanism and sand blasting equipment. The spray gun mechanism is used for spraying sand towards a first face of a workpiece, a second face opposite to the first face and an outer side face connected between the first face and the second face. The spray gun mechanism comprises a moving assembly, a connecting piece connected with the moving assembly so as to be driven by the moving assembly to move and a spray gun assembly connected with the connecting piece and moving synchronously with the connecting piece, and the spray gun assembly comprises a first spray gun with the adjustable spraying angle, a second spray gun with the adjustable spraying angle and a third spray gun. The first spray gun is used for spraying sand towards the first face, the second spray gun is used for spraying sand towards the second face, the third spray gun is used for spraying sand towards the outer side face, and the first spray gun and the second spray gun are symmetrically arranged and located on the same side of the third spray gun. According to the spray gun mechanism and the sand blasting equipment comprising the spray gun mechanism, the three different surfaces of the workpiece are subjected to sand blasting at the same time through the spray gun assembly, and the working efficiency and the sand blasting yield can be improved.

The utility model relates to an intelligent cleaning device for a sand box, and belongs to the field of industrial automation and intelligent manufacturing. According to the scheme, the rail type RGV is adopted to automatically convey the sand box to the closed intelligent cleaning work station, and the information of the sand box is read through the RFID tag and synchronized to the information system. The cleaning robot scans the position of the sand box through the visual recognition device, and the tool changing robot grabs the adaptive drill bit from the drill bit tool library according to a system instruction and assembles the adaptive drill bit to the electric hammer chuck. And the cleaning robot drills and dredges the sand guide hole of the sand box, returns to the quick change frame to replace the electric pick, and performs multi-angle shoveling and scraping operation on the cavity of the sand box. And after cleaning is completed, the cleaning robot is switched to the sand blasting gun, and fine sand cleaning on the surface of the sand box is completed. The scheme aims at solving the problems that traditional manual cleaning is low in efficiency, severe in environment and large in potential safety hazard.

The invention belongs to the technical field of stainless steel pipe production, and particularly relates to stainless steel pipe production cleaning equipment which comprises a pair of cleaning frames, a pair of soaking cylinders are symmetrically arranged on the two sides of each cleaning frame, a supporting frame is installed at the end of each cleaning frame, and a plurality of fixing barrels are fixedly connected to the top end of each supporting frame. An inserting rod is inserted into the fixing cylinder, a plurality of supporting assemblies are fixedly connected to the surface of the inserting rod, supporting blocks are fixedly connected to the ends, away from the inserting rod, of the supporting assemblies, and a transmission notch is formed in the top end of the uppermost supporting block; when the stainless steel pipe production cleaning equipment is used, a rotating shaft drives a sponge block to move in a stainless steel pipe and controls the sponge block to rotate, the sponge block can be matched with clear water to clean the inner wall of the stainless steel pipe along with movement of an inserting rod in the stainless steel pipe, and compared with pure clear water flushing, the cleaning effect is more excellent; and firm dirt attached to the inner wall of the stainless steel pipe can be fully cleaned.

The invention discloses a spray gun track generation method and device, equipment and a medium. The method comprises the following steps: based on basic data of a target part set by a user, obtaining a finite element simulation result matched with the target part through finite element simulation software; in response to a selection operation of a user on the finite element simulation software, selecting at least one simulation point location from the simulation point locations as a target point location, and acquiring simulation result information matched with the target point locations as target point location information of the target point locations; and based on the target point location information corresponding to the target point locations, spray gun point location postures matched with the target point locations are generated, and a target spray gun track is obtained according to the spray gun point location postures. According to the technical scheme, the track of the spray gun can be generated in the shot blasting operation, the accuracy of the shot blasting operation is improved, and the shot blasting effect is improved.

The pipe workpiece spraying production line comprises a production rack, a conveying part, a sand blasting treatment part, a spraying treatment part and a stroke monitoring part, the conveying part comprises a chain-shaped track, the chain-shaped track is installed on the production rack, a plurality of installation bases are arranged on the chain-shaped track, and the sand blasting treatment part is installed on the installation bases; the mounting base is provided with a circular clamping groove, and a pipe workpiece is suitable for being clamped in the circular clamping groove so as to be fixed to the mounting base. The sand blasting treatment component comprises a sand blasting bin, a first sand blasting gun and a second sand blasting gun, the sand blasting bin is installed on the production rack, the sand blasting bin is provided with a sand blasting cavity, a first inlet and a first outlet, the sand blasting cavity is communicated with the first inlet and the first outlet, and the second inlet is communicated with the second outlet. Automatic sand blasting, spraying and follow-up treatment can be conducted on the inner surface and the outer surface of a pipe workpiece, contact damage to the surface of the pipe is avoided through the chain type track and the mounting base, and the coating uniformity and the production efficiency are improved.

A mixed abrasive synergistic enhancement immersion microjet processing system and method for RB-SiC ceramic microstructures is characterized by: the micro-abrasive air jet nozzle is driven by an active rack and driven gear, and one end is connected to a precision sandblasting machine containing micron-sized abrasive particles; its output end is immersed in a slurry tank containing submicron / nano-sized abrasive particles; the micro-abrasive air jet nozzle ejects a gas-solid two-phase flow and generates a large number of microbubbles; the driving effect of the microbubbles effectively mixes the submicron / nano-sized abrasive particles in the slurry tank with the gas-solid two-phase flow ejected by the micro-abrasive air jet nozzle, thereby obtaining a mixed abrasive synergistic enhancement immersion microjet; the waste liquid passes through a primary filter particle recovery outlet, a secondary filter particle recovery outlet, and a tertiary filter particle recovery outlet in real time, where the micron-sized abrasive particles and erosion debris are screened, dried, and classified for collection, ultimately achieving efficient and high-quality processing of RB-SiC ceramic microstructures.

The invention discloses an inner circle surface cluster magnetic jet polishing device and method, and belongs to the technical field of polishing equipment.The magneto-rheological polishing and jet polishing are combined, that is, magneto-rheological polishing liquid is jetted out of a liquid outlet of a cluster magnetic jet polishing head at a high speed under the high-pressure effect, efficient jet rough polishing is conducted on the inner circle surface of a workpiece, and the inner circle surface is polished. And meanwhile, under the action of the magnetic field, the magnetorheological polishing liquid is converted into a magnetorheological polishing pad and a flexible clamping abrasive for secondary fine polishing, so that the problems of workpiece deformation and poor surface quality easily caused by traditional honing and polishing are solved, the defect of low efficiency of single magnetorheological polishing is overcome, and the polishing efficiency and the surface quality are improved. Besides, the device can adapt to workpieces with different diameters by replacing cluster magnetic jet polishing heads and workpiece discs with different sizes, and the machining requirements of the workpieces made of different materials are met by matching with adjustable polishing liquid pressure, flow and rotating speed parameters; due to the expanded double-station design, the machining efficiency is improved, and the machining requirements of high-quality inner circle surface parts are met.

The invention discloses a turnover die casting multi-dimensional deburring machining center, which relates to the technical field of deburring machining and comprises a machining main center, a support frame, a deburring machining bin and a control panel. According to the turnover die casting multi-dimensional deburring machining center, a single driving motor is used for providing driving force, a driving shaft is made to be matched with a first chain wheel assembly in a rotating mode, then a driven shaft can be made to rotate, a discharging auger can rotate conveniently, sand sprayed in the deburring machining process can be conveyed out from a conveying barrel, and later recycling is facilitated; then, a driven shaft rotates to be matched with a second chain wheel assembly to enable a transmission shaft to synchronously rotate, namely, a transmission gear rotates, the transmission gear, a transition gear and a driven gear are meshed with one another, the transition gear and the driven gear can rotate, and two four-jaw chucks in a deburring machining bin can rotate by being matched with an auxiliary shaft; therefore, the clamped die casting can rotate synchronously, and dynamic adjustment of a machining face is achieved.

The invention belongs to the technical field of automatic sand blasting, and provides a mechanical arm sand blasting track generation method and system, a medium and a robot. The mechanical arm sand blasting track generation method comprises the steps that key process parameters of a sand blasting system are discretized in a layered mode; calculating the actual angle of each joint of the positioner; coordinates of spraying points are calculated; the joint angle of the mechanical arm is calculated, and the collision-free effective posture of the mechanical arm meeting the sand blasting process requirement is screened; a collision-free and process-feasible configuration space diagram is constructed, the vertex of the configuration space diagram is composed of all spraying points, and the edge of the configuration space diagram is composed of paths of the adjacent spraying points; and according to the collision-free and process-feasible configuration space diagram, an optimal path from a preset starting vertex to a target vertex is searched for and serves as a mechanical arm sand blasting track for optimizing the kinematics performance and the sand blasting process quality at the same time. The automatic level of sand blasting treatment, the consistency of treatment quality and the overall operation efficiency can be improved.

The utility model discloses metal part batch polishing equipment which comprises an outer shell, a hydraulic cylinder is installed at the top end of the outer shell, the output end of the hydraulic cylinder extends into an inner cavity of the outer shell, a sand blasting machine nozzle is installed at the output end of the hydraulic cylinder, an installation base is installed in the inner cavity of the outer shell, and a workbench is installed at the top end of the installation base. A motor is installed on the outer wall of the shell, the output end of the motor extends into an inner cavity of the workbench, a first gear is rotationally installed in the inner cavity of the workbench and connected with the output end of the motor, and a plurality of second gears are installed in the inner cavity of the workbench at equal intervals in the circumferential direction. And the second gear is meshed with the first gear. According to the batch polishing equipment for the metal parts, in actual use, it is guaranteed that a filling tool revolves while rotating during polishing, it is guaranteed that the outer walls of workpieces can be stably and evenly polished, meanwhile, the workpieces can be tightly supported, self-shaking of the workpieces is avoided, and normal polishing work is guaranteed.

The invention belongs to the technical field of semiconductor precision manufacturing, and discloses micro-nano powder wafer non-traditional machining equipment which comprises a sand blasting machining structure, a sand path and gas path structure, a sand returning and storing structure and a tail gas treatment structure. The sand path and gas path structure comprises a sand path group, a gas path group and an exhaust fan; the gas circuit group is arranged in the sand blasting processing structure and is communicated with the exhaust fan; one end of the gas circuit group is communicated with the exhaust fan, and the other end of the gas circuit group is communicated with the top of the sand returning and storing structure; and the tail gas treatment structure is communicated with the sand returning and storing structure. According to the micro-nano powder wafer non-traditional machining equipment, the problems of toxic pollutant treatment caused by wet etching, low laser machining efficiency and the like are solved.

The present disclosure relates to abrasive material delivery systems for liquid jet cutting systems. The abrasive material delivery systems can include a valve configured to adjust an inflow of abrasive material into the abrasive material delivery system from a source of abrasive material. The systems can include a chamber downstream of the valve and configured to receive the inflow of abrasive material from the valve. The systems can include a metering component configured to control an outflow of abrasive from the chamber to a cutting head of the liquid jet cutting system. In some embodiments, the systems include a sensor configured to monitor movement of a top surface of a portion of abrasive material within the chamber as the top surface moves through the chamber; and a processing device operably connected to the sensor and configured to determine an abrasive flow rate through the metering component based on a speed of the top surface as monitored by the sensor.

The invention discloses an abrasive water jet cleaning device and cleaning method.The abrasive water jet cleaning device comprises a cleaning box body, a spray head cleaning assembly and a conveying roller way, and the spray head cleaning assembly comprises a mounting frame, a mounting block and a spray head; the spray head cleaning assembly located on one surface of the steel plate / belt comprises a pair of installation frames, each installation frame is provided with a plurality of spray heads, the cleaning areas of the spray heads on the two installation frames cover the transverse width of the steel plate / belt after being combined, the spray heads on the two installation frames are obliquely arranged, and the spray heads on the two installation frames are arranged in a staggered mode. And the spraying directions of the sprayers face the two transverse sides of the steel plate / strip respectively. According to the cleaning device and the cleaning method, under the condition that optimal process parameters and spatial arrangement conditions of the spray head are met, extremely high part universality can be achieved, modular disassembly can be carried out, and the equipment site requirement can be reduced.

The invention relates to the technical field of sand blasting, in particular to a sand blasting device for metal part rust removal. Comprising a sand pipe arranged on a movable support, an electric control valve is installed on the sand pipe, a motor is installed on the sand pipe, the sand pipe is rotationally connected with a rotating pipe, the rotating pipe is fixedly connected with a flow guide frame, and the flow guide frame is communicated with a sand blasting nozzle. The flow guide frame is slidably connected with a sliding rod, the sliding rod is fixedly connected with a detection frame, and the sliding rod is provided with a pressure sensor. The flow of the electric control valve is regulated and controlled through the two pressure sensors, the sand blasting amount at different diameter positions of the inner wall of the pipeline is adjusted so as to adapt to different sand blasting amounts needed by all positions of the variable-diameter pipeline, then the uniformity of sand blasting of the inner wall of the variable-diameter pipeline is guaranteed, the sand blasting derusting effect is guaranteed, and when the branch position of the variable-diameter pipeline is encountered, the sand blasting efficiency is improved. And the probability that the normal use of the variable-diameter pipeline branch pipe is influenced by sand accumulation in the variable-diameter pipeline branch pipe is reduced.

The invention relates to a dynamic lag compensation method for inclined hole machining of a base of a water jet cutting machine. The dynamic lag compensation method comprises the following steps that S1, machining parameters are obtained; s2, establishing a dynamic lag vector model; s3, based on the target axis vector of the inclined hole, establishing an asymmetric taper prediction model; s4, coupling the dynamic lag vector model and the asymmetric taper prediction model to generate a comprehensive compensation model; s5, real-time reverse compensation is conducted on a preset inclined hole cutting theoretical tool path; s6, the high-pressure abrasive water jet device is controlled to conduct inclined hole machining on the cutting machine base according to the execution path; and S7, in the cutting process, water jet pressure, abrasive flow and nozzle abrasion state parameters are built in real time. The method has the following advantages that accurate compensation of the dynamic hysteresis effect and effective suppression of the asymmetric taper are achieved, the hole axis and position precision is remarkably improved, and the high-quality hole wall shape is obtained.

The utility model relates to in-pipe sand blasting equipment. The in-pipe sand blasting equipment comprises a moving platform car capable of moving in a steel pipe to be subjected to sand blasting; the plurality of sand blasting guns are used for blasting sand grains; the sand blasting gun is mounted on any one of the mechanical arms, and the multiple mechanical arms are connected to the motion platform car and can move along with the motion platform car; the multiple mechanical arms synchronously rotate around a set rotating shaft so as to drive the sand blasting guns connected with the mechanical arms to move and change the positions of the sand blasting guns in the steel pipe. According to the in-pipe sand blasting equipment, automatic sand blasting operation can be achieved on the inner wall face of the steel pipe, manual operation of a sand blasting gun is not needed, the sand blasting efficiency is improved, the problem of uneven sand blasting can be solved, the stability of the sand blasting effect of the inner wall face of the steel pipe is good, and the service life of the steel pipe is prolonged. And the workers can be far away from the severe environment with closed space and more dust in the sand blasting room, so that the health damage to the workers caused by the severe environment is reduced.

The utility model discloses a sandblasting derusting device used in a pipeline, and particularly relates to the technical field of pipeline derusting equipment, the sandblasting derusting device comprises a sandblasting gun arranged in a fixed head, one side of the fixed head is provided with a derusting column, one side of the derusting column is movably provided with a movable column, the inside of the movable column is movably connected with two movable rods, and the movable rods are movably connected with the fixed head. And scrapers are fixedly mounted at the ends, extending out of the movable column, of the two movable rods. According to the sand blasting derusting device used in the pipeline, in the actual work, a first electric push rod pushes a driving block to descend, so that two movable rods can move towards the outer portion of a movable column, two scraping plates can be pushed to make contact with the inner wall of the pipeline, and after derusting is completed, in the process that the device is pulled out of the pipeline, the device can be driven to move towards the outer portion of the movable column. The two scraping plates can bring out sand and rust falling into the pipeline, the gear drives the gear ring to rotate, the positions of the two scraping plates can be adjusted, and therefore the rust and the sand falling into the pipeline can be cleaned conveniently.

The utility model discloses a sand blasting derusting device for the surface of a machined part, and particularly relates to the technical field of derusting. The sand blasting derusting device for the surface of the machined part comprises a supporting plate and a sand blasting gun for sand blasting derusting of the machined part, a compression inlet pipe is arranged at one end of the sand blasting gun, universal moving wheels are arranged at the corners of the bottom of the supporting plate, a height adjusting structure is arranged on the supporting plate, and a support frame is arranged on the height adjusting structure. The inner side of the support frame is rotationally connected with a rotary supporting structure, a fixing pipe is arranged on the rotary supporting structure, the fixing pipe is rotationally connected with the support frame through the rotary supporting structure, the sand blasting gun is arranged in the fixing pipe, and a sand blasting installation structure used for fixing the sand blasting gun is arranged on the fixing pipe. The sand blasting gun solves the technical problems that pressure exists when the sand blasting gun sprays materials at a high speed, and manual sand blasting operation is strenuous when the sand blasting gun is held for a long time.

The present application relates to a kind of double-system integrated high-efficiency sand blasting machine, by symmetrical arrangement double sand blasting frame and supporting device, realize two groups of cooker synchronous feeding-sand blasting-discharging cycle operation, compared with traditional single system production capacity increases 100%, simultaneously, through the three-station uniform distribution design of rotating frame, form continuous assembly line mode of operation;Double rack interval type layout both guarantees independent operation space, also share central finished product centralized conveying belt;Three groups of cooker fixed component distribution optimizes space utilization, compared with traditional linear arrangement scheme reduces 30% of floor area;By being provided with discharging device on the side of feeding device, and the other end of discharging device is connected with cleaning process, so that cooker can be immediately transported to sand blasting machine for sand blasting work after cleaning, realize automatic feeding-feeding-sand blasting-discharging, form closed-loop material flow, cooperate with finished product centralized conveying belt, reduce 80% of manual intervention link, single shift can save 3-4 operating personnel.

The application provides a fir-type mortise and tenon joint structure deflection abrasive water jet strengthening method and system. The method uses a deflection abrasive water jet nozzle and a three-sided shielding strengthening tool to strengthen the surface of a workpiece. The system uses the above method. The application can solve the problems of "physical inaccessibility" (cannot enter) and "jet shadow" (cannot be sprayed / angle is not correct) of traditional strengthening tools in the extremely limited space of a fir-type mortise and tenon joint structure (deep groove, multiple teeth, reverse buckle), thereby realizing full coverage and uniform stress distribution of surface strengthening.

The utility model belongs to the field of sand blasting tools, and particularly relates to a notebook computer cover plate sand blasting tool which comprises a tank body, and a sand blasting assembly is fixedly installed on the inner wall of the tank body. The surface of the sand blasting assembly is provided with a plurality of nozzles used for blasting sand to the notebook computer cover plate. The top of the tank body is fixedly connected with a motor; the output end of the motor is fixedly connected with a main rod; the main rod and the tank body are arranged in a penetrating manner and are rotationally connected; a plurality of supporting rods are symmetrically and fixedly connected to the middle part of the main rod; a plurality of clamping mechanisms are arranged on each supporting rod; the clamping mechanism comprises a pair of fixing plates; clamping plates are symmetrically and rotationally connected between the pair of fixing plates; a spring is fixedly connected between the pair of clamping plates; through the cooperation of the motor and the clamping assembly, the cover plate can be in a rotating posture during sand blasting, the sand blasting assembly can conveniently conduct sand blasting on the two faces of the cover plate, and the operation that the cover plate needs to be turned over repeatedly during sand blasting is simplified.

The method employs blast media containing a first grainy material, consisting mainly of a material with a hardness equal to or less than that of the target member to be restored in granular form. This blast media, along with gas, is ejected from a nozzle with a substantially rectangular-shaped outlet, while adjusting the flow rate. The ejected mixture functions as a graining tool to remove pollution, exposing underlying or surrounding surface to be restored of the target member without grinding away the surface and simultaneously providing a rough treatment to form fine texture on the restored surface.

The present invention provides a method for manufacturing a sealing device that can roughen the inner surface of the slinger, which is in sliding contact with the lip piece, over a wide area, and can also ensure uniform roughening of the slinger. [Solution] The slinger 20A comprises a first cylindrical portion 22 and a disc portion 21 which are responsible for fitting into one of the two members, and has a recessed space 24 opposite to the core material portion 30A, with the first cylindrical portion 22 and the disc portion 21 forming the outer frame. In the surface treatment step, the projection material 41 is projected onto the surface of the slinger 20A on the recessed space 24 side at different projection angles.

The application discloses a workpiece surface sand blasting and grinding device for insulating bearing machining, and relates to the technical field of insulating bearing machining.The device comprises a shell, a baffle and a cover plate are installed on the shell, an air pump is installed on the top of the shell, a first connecting pipe is connected below the air pump, a driving assembly is installed below the first connecting pipe, a rotating ring and a second connecting pipe are installed below the driving assembly, a third connecting pipe and an electric push rod are arranged on the side of the second connecting pipe, a first sand blasting pipe is installed below the electric push rod, a second sand blasting pipe is hinged to the first sand blasting pipe, a butt joint assembly is installed between the first sand blasting pipe and the second sand blasting pipe, the top of the third connecting pipe is fixedly connected with a first extension pipe, and a second extension pipe is slidably installed on the outer side of the first extension pipe.The device solves the problems that the existing sand blasting device cannot switch between the inner wall sand blasting and the surface sand blasting of the bearing seat ring and cannot recycle the abrasive.

A method (300) of smoothing an inner surface of a tubular wall (232, 262, 264) of a workpiece (136, 224, 236, 260) is disclosed, including immersing (310) the workpiece in a mixture of a liquid and an abrasive and inserting (312) a cavitation peening nozzle (142, 212) into a cavity of the workpiece. The method further includes injecting (314) a cavitating jet from the cavitation peening nozzle into the cavity.

The utility model discloses surface treatment equipment for mold production, which belongs to the technical field of mold production and comprises a sand blasting machine body, a door frame is mounted on one side of the sand blasting machine body, and an observation window and a skylight are mounted on the side face and the top of the sand blasting machine body respectively. Supporting legs are fixedly connected to the lower portion of the sand blasting machine body, a discharging hopper is installed at the bottom of the sand blasting machine body, and a motor is installed in the discharging hopper. The four clamping assemblies are distributed above the machining disc in a surrounding mode, firstly, a to-be-machined mold is placed above the machining disc, at the moment, the adjusting buttons are sequentially screwed to drive the screw rods to rotate, the arc-shaped pads are attached to the surface of the mold, clamping and limiting of the mold are formed, then the position of a spray head of a sand blasting machine is aligned with the mold, and sand blasting is conducted; and dust and residual abrasive materials can be filtered through a filter frame and sieve holes, traditional manual sand blasting on the mold is replaced, the overall working efficiency is high, and operation is convenient.

The utility model provides a kind of nozzle (10) for cavitation surface treatment, the nozzle (10) for cavitation surface treatment has nozzle head (13), the nozzle head (13) has: first plane (13a), it sprays liquid, and with jet axis (1) vertical;Second plane (13b), it is vertical with jet axis (1), is the opposite side of first plane (13a);Nozzle hole (21), the nozzle hole (21) has: semicylindrical discharge groove (23), it is configured in first plane (13a), extends in the first direction with jet axis (1) vertical;Ejection hole (25), it extends along jet axis (1), and is connected with discharge groove (23), and for the straight elliptical cylinder with long diameter in the first direction extending ellipse-shaped section;Import portion (27), it has straight conical surface (27a) with jet axis (1) as central axis, and is connected to ejection hole (25).

A noise suppressed blasting system comprising: a source of blasting gas in a predetermined pressure range with abrasive particles entrained therein; a nozzle including a nozzle inlet for connection to the source of blasting gas, a nozzle outlet for emission of the blasting gas, a nozzle conduit from the nozzle inlet to the nozzle outlet including a throat therebetween with a ratio of area of the nozzle outlet to area of the throat selected to emit the blasting gas from the nozzle outlet to produce a supersonic jet; a silencer connectable to the nozzle, to receive the supersonic jet exiting the nozzle, the silencer comprising a body with a silencer conduit therethrough, the body being of sufficient length and diameter to cause a flow condition of the jet received from the nozzle outlet to be modified such that 11 / 2 shock cells are created in a jet inside the silencer, no shock cells are created in the jet outside the silencer and a jet exits the silencer in the form of a core jet with an established turbulent shear layer thereabout and entraining an annular jet located around the core jet.