258 results about "Central cylinder" patented technology

The utility model discloses an integrated magnetic flocculation device system and relates to the technical field of water treatment devices. The device comprises a device shell, a central cylinder, a conical mud bucket, a water inlet pipe, a flocculant dosing pipe, a pipeline mixer, a gas inlet pipe for gas stripping, a coagulant aid dosing pipe, a water outlet pipe and a mud discharge pipe, according to the utility model, when water enters, a flocculant is added and mixed on a water inlet pipe by using a pipeline mixer, after water enters the magnetic coagulation area, compressed air is used as a power source for circulation and mixing, a coagulant aid is added above an air release port, supplementary magnetic powder is added to an upper opening of a central cylinder, and water subjected to magnetic coagulation reaction enters the precipitation separation area; when the magnetic coagulation reaction device is used, supernatant is collected by the water collecting tank and then discharged, precipitated sludge containing magnetic powder can slide into the conical sludge bucket to be treated again, redundant sludge is discharged through the sludge discharging pipe, the whole magnetic coagulation reaction and sludge-water separation treatment process is completed in one device, and an independent backflow system is not needed.

A device (1) for holding and / or moving a rod-shaped body (2) is proposed, comprising: a fully enclosed housing (3) with a longitudinal axis (L) along which the rod-shaped body (2) is guided or is to be guided; a thrust piston (4) surrounding the rod-shaped body (2), which can be subjected to a first pressure from the outside via a first pressure port (L) through the housing (3) and which can be subjected to a second pressure from the outside via a second pressure port (K) through the housing (3), and which has a first effective surface (5) and a second effective surface (6), which effective surfaces (5, 6) preferably extend in a radial direction, wherein the first effective surface (5) is in fluidic operative connection with the first pressure port (L) and the second effective surface (6) is in fluidic operative connection with the second pressure port (K), wherein the thrust piston (4) has a radially internal recess (7) through which a circumferential free space (8) is formed between the rod-shaped body (2) and an inner surface (9) of the thrust piston (4), which free space (8) has an axial limit (10, 11) on both sides; and at least one clamping sleeve (12) which, with its inner surface (13), defines a central cylindrical area through which the rod-shaped body (2) is guided or can be guided, and which is received in the aforementioned free space (8), extending axially between the two axial limits (10, 11), wherein the clamping sleeve (12) can be subjected to a third pressure from the outside via a third pressure port (V) through the force-pull piston (4) and is designed to deform itself reversibly radially inwards according to the third pressure and to exert a holding force on the rod-shaped body (2).

The application discloses a punching device for motorcycle exhaust muffler pipes and particularly relates to the technical field of punching devices, which comprises a supporting frame, a clamping and punching assembly arranged on the supporting frame, the clamping and punching assembly comprising a central cylinder arranged in the supporting frame, one end of the central cylinder being provided with an adjusting circular truncated cone cylinder, and a plurality of clamping blocks being arranged on the middle part of the adjusting circular truncated cone cylinder. The clamping blocks can be synchronously contracted or expanded along the radial direction, and the arc-shaped fitting grooves on the clamping blocks and the rubber pads can stably clamp the motorcycle exhaust muffler pipes with a certain range of outer diameter differences. The punching device can solve the problem that the traditional punching device can only be adapted to single-specification pipes and the time-consuming replacement of molds, greatly improve the universality of the equipment, simultaneously punch different positions of the same section of the muffler pipe, and automatically feed the slip ring through the motor-driven screw rod, so that the clamping, angle adjustment, punching and resetting linkage operation can be completed, manual intervention is reduced, and the operation strength is reduced.

The invention belongs to the technical field of reagent extraction, and particularly relates to chemical reagent uniform mixing and extracting equipment for a laboratory and a using method thereof.The chemical reagent uniform mixing and extracting equipment comprises a base, a rotary drum is rotationally installed on the base through a motor, a storage barrel is detachably installed on the rotary drum, and a rear frame is arranged on the rear portion of the base. The central cylinder drives the plurality of injectors to circularly work to form an extraction-transfer-sample adding assembly line, so that when a chemical reagent is extracted into a test tube, the sampling of multiple parts of the reagent can be continuously completed, and by regulating and controlling the downward moving range of the sliding frame, the sampling efficiency is greatly improved. When the liquid level drops after the reagent in the storage barrel is extracted for a certain number of times, the injector on the sliding frame can always extract the chemical reagent in the storage barrel, and the position of the rectangular piece can be accurately controlled when the pointer slides on the graduated scale by lifting the lifting plate on the rectangular piece.

The present disclosure provides a device for separating gases from liquids, which pertains to the technical field of pipeline fittings and solves the technical problem of poor gas separation efficiency in existing separation devices. The present separation device comprises: a housing, a central cylinder fixed in a separation chamber of the housing and a blocking member located below the central cylinder, a plurality of spiral blades are fixed between the housing and the central cylinder in a spiral arrangement along a up-and-down direction, outlets of liquid passage channels are located outside at a lower end of the central cylinder and are substantially evenly distributed along a circumference of the central cylinder, an upper surface of the blocking member is provided with a downwardly sunken concave cavity that faces and aligns with the central cylinder. The present separation device can effectively enhance the separation efficiency of gases from liquids.

The invention discloses an intelligent tunnel construction monitoring and self-adaptive supporting system based on multi-mode perception and a self-adaptive method.The system comprises a plurality of distributed optical fibers located in a tunnel, and the distributed optical fibers are connected with a data acquisition system through anti-bending optical fiber jumpers; a plurality of adjustable anchor rod assemblies are arranged at preset positions on the wall of a tunnel, anchor rods of the adjustable anchor rod assemblies are connected with an assembled pressure-bearing central pivot cylinder, the inner wall of the assembled pressure-bearing central pivot cylinder is connected with a pressure-bearing core column through a micro jack, the assembled pressure-bearing central pivot cylinder is sleeved with the pressure-bearing core column, and the pressure-bearing core column is connected with the pressure-bearing core column. And the data acquisition system is positioned on the assembled pressure-bearing central cylinder. According to the intelligent tunnel construction monitoring and self-adaptive supporting system based on multi-modal sensing and the self-adaptive method, efficient and accurate supporting of tunnel surrounding rock is achieved, the safety of tunnel construction and operation is improved, and meanwhile the supporting cost is reduced.

A core structure of a coil-wound heat exchanger and a coil-wound heat exchanger. The core structure comprises a central cylinder and a heat exchange tube, which extends in the axial direction of the central cylinder and is spirally wound around the periphery of the central cylinder layer by layer from the inside out to form multiple spiral tube layers. The core structure further comprises an annular sound-absorbing cylinder, the peripheral wall of which forms a sound-absorbing cavity with two open ends by means of enclosure and is circumferentially arranged between two adjacent spiral tube layers. During heat exchange, the sound-absorbing cylinder of the present utility model can absorb noise generated during the heat exchange of the part of the core structure enclosed within the sound-absorbing cylinder, thereby achieving the effect of noise reduction. Moreover, since the two ends of the sound-absorbing cylinder are open, a shell-side medium for heat exchange can enter and exit the sound-absorbing cylinder for heat exchange, without affecting the normal heat exchange operation of the core structure.

The utility model relates to the field of tea bag bottle caps, in particular to a tea bag separation bottle cap which comprises a fixed bottle cap body used for storing a tea bag, a center cylinder used for puncturing a diaphragm at the bottom of the fixed bottle cap body and a twisting bottle cap body used for providing puncturing power for the center cylinder. The diaphragm is arranged on the end face of the bottom of the bottom cylinder, and the bottom cylinder is connected with the twisting bottle cap through a locking assembly. The top of the twisting bottle cap is provided with an inner support ring, so that inner and outer supports are provided when the upper end extrudes the central cylinder, and extrusion deformation is avoided; the bottom puncturing blade at the bottom of the puncturing cylinder is in a spine shape, so that the breaking effect on the diaphragm is guaranteed; the inner supporting ribs are adopted, the overall strength is improved, meanwhile, loss of raw materials is reduced, downward pressing stress can be concentrated on the diaphragm through transmission of the reinforcing ribs, and the puncturing effect is guaranteed.

The utility model relates to the technical field of liquid packaging machine equipment, and discloses a feeding device of a back sealing liquid packaging machine, which comprises a liquid storage tank, the upper side of the liquid storage tank is rotatably connected with a second bevel gear, and the lower side of the second bevel gear downwards penetrates through an upper tank cover of the liquid storage tank and is fixedly connected with a plurality of connecting rods; a plurality of connecting rods are arranged in the liquid storage tank, the lower ends of the plurality of connecting rods are jointly and fixedly connected with a central cylinder, a shaftless auger blade is rotatably connected in the central cylinder, and the upper end of the shaftless auger blade is fixedly connected with a transmission rod. The shaftless auger blade can convey macromolecular substances settled below the liquid storage tank to the upper-layer space of the liquid storage tank along the central cylinder, and the macromolecular substances are mixed with an upper-layer low-density solution, so that the density difference value of the upper-layer solution and the lower-layer solution is reduced, and the densities of the upper-layer solution and the lower-layer solution in the whole liquid storage tank tend to be uniform relatively.

The utility model discloses an installation support of a superconductor, and belongs to the technical field of superconducting coils. Wherein the center cylinder is of a hollow cylinder structure and is defined by two first arc-shaped pieces and two second arc-shaped pieces, embedding grooves and embedding protrusions matched with the embedding grooves are arranged on the two sides of the first arc-shaped pieces and the two sides of the second arc-shaped pieces, and the first arc-shaped pieces are connected with the second arc-shaped pieces. The central cylinder is formed by splicing and combining the first arc-shaped sheets and the second arc-shaped sheets, and the end plates and the central cylinder can be detachably connected, so that the superconducting coil mounting bracket is of a non-integrated structure, when local damage occurs, the damaged local area can be independently maintained or replaced, the whole mounting bracket does not need to be replaced, and the cost is reduced. And the cost is reduced.

A portable linear fastener driving tool is provided that drives staples, nails, pins, or other linearly driven fasteners. The tool uses a gas spring principle, in which a cylinder filled with compressed gas is used to quickly force a piston through a driving stroke movement, while a driver also drives a fastener into a workpiece. The piston / driver is then moved back to its starting position by use of a rotary-to-linear lifter, and the piston further compresses the gas above the piston, thereby preparing the tool for another driving stroke. In an illustrated embodiment, the tool exhibits an inverted U-shape tri-chamber design for the central cylinder, a left-side pressure chamber, and a right-side pressure chamber. In one illustrated embodiment, the lifter motor is configured to have its longitudinal axis substantially parallel to the longitudinal axis of the working cylinder, thereby making this tool more compact. Other embodiments show the angle to be between 0-90 degrees.

The invention belongs to the technical field of combustion equipment, and relates to a plasma ignition system and a using method thereof. The system comprises a plasma generator, a combustor, a power supply system, a carrier working medium system and a cooling water system, an anode and a cathode of the plasma generator are coaxially arranged to form an electric arc cavity and a surrounding cooling water cavity, and the anode is provided with a compressed air inlet and a plasma jet outlet; the plasma combustor is sequentially and coaxially sleeved with a first-stage center cylinder, a second-stage combustion cylinder and an outer wall cylinder from inside to outside, the first-stage center cylinder communicates with the jet flow outlet, and the outer wall cylinder is provided with a pulverized coal inlet; the power supply system supplies power to the generator through the isolation transformer and the rectifier cabinet. The carrier working medium system supplies air to the compressed air inlet; the cooling water system enables demineralized water to circulate in the cooling water cavity. Efficient and stable ignition and low-nitrogen combustion of pulverized coal are achieved, the ignition reliability is remarkably improved, the system service life is remarkably prolonged, and the operation automation level is remarkably improved.

The utility model discloses a manufacturing auxiliary device for an aluminum coiled tube type heat exchanger, and belongs to the technical field of heat exchanger manufacturing tools. The device provided by the utility model comprises a manufacturing platform, an automatic pipe feeder, two turntables, a central cylinder and a track. Each rotating disc is fixedly installed on the manufacturing platform through a roller frame, the center cylinder is horizontally installed between the two rotating discs, the two ends of the center cylinder are fixedly connected with the rotating discs through clamps respectively, and the central axis of the center cylinder and the central points of the rotating discs are located at the same horizontal height. The automatic pipe feeding machine is arranged on one side of the manufacturing platform and is in sliding connection with the track. And an automatic lifting machine is arranged on the automatic pipe feeding machine. An operator flexibly adjusts the conveying speed of the aluminum pipes through the automatic lifting machine and the automatic pipe conveying machine, it is ensured that the aluminum pipes are tightly attached to the center cylinder or the aluminum pipes on the upper layer, and therefore the pipe winding flatness and the gap precision are improved. And meanwhile, the automatic pipe feeding machine can move left and right along with an operator, so that the convenience and efficiency of pipe winding work are further improved.

The invention relates to the technical field of grinding machines, in particular to a grinding machine with automatic discharging and sorting functions. According to the technical scheme, the machine comprises a machine shell, wherein a side part is arranged on the side edge of the machine shell; the charging barrel is fixedly connected to the top of the shell; the inner barrel is rotationally connected into the charging barrel; the bottom bin is fixedly connected to the bottom of the inner cylinder; the central cylinder is fixedly connected to the center of the inner cylinder; the sieve tray is arranged in the inner cylinder in a sliding manner; the sealing rod is fixedly connected to the bottom of the inner cylinder; the first driving piece is arranged in the machine shell; the second driving piece is arranged in the machine shell; the bottom of the inner cylinder is funnel-shaped, the central cylinder is of a hollow structure, and a feeding hole is formed in the lower part of the central cylinder and corresponds to the lowest point of the bottom of the inner cylinder; and the conveying piece is arranged in the central cylinder. The problems that in the prior art, additional screening operation is needed, abrasive recovery is inconvenient, and overall manual intervention is much can be solved, so that the abrasive and abrasive dust separation efficiency is improved, and the overall grinding machining efficiency and the material utilization rate are improved.

The utility model discloses a lifting escalator device for engineering detection, which relates to the technical field of engineering detection equipment and comprises a lifting escalator, a water pump is arranged on the lifting escalator, a following type protective vertical rod is arranged on the front side of the lifting escalator, and the following type protective vertical rod comprises a fixed base. A multi-stage telescopic cylinder is installed on the upper side wall of the fixed base, a connector of the multi-stage telescopic cylinder is connected with a water pump through a pipeline, a sliding sleeve is connected to the interior of a center cylinder body of the multi-stage telescopic cylinder through a spring, and the outer side wall of the sliding sleeve is tightly attached to the inner wall of the center cylinder body of the multi-stage telescopic cylinder. According to the utility model, a detection person is protected by the lifting ladder with the independently lifted following type protective vertical rod, and when the detection person wears a protective waistband, the following type protective vertical rod can ensure the safety of the detection person, so that the detection person is prevented from sliding off from the lifting ladder; and meanwhile, safety accidents caused by rollover and overturning of the lifting escalator can be avoided.

This utility model discloses a mechanically replaceable side-mounted agitator, comprising a motor mounted on a bracket, the motor being connected to the input shaft of a reducer via a coupling, a main shaft inserted into the central cylinder of the reducer mounting base, a hollow shaft fitted onto the outer wall of the central cylinder, a large bevel gear fixedly fitted onto the outer wall of the hollow shaft, a small bevel gear fixedly fitted onto one end of the reducer's input shaft inserted into the housing, the small bevel gear meshing with the large bevel gear, and the end of the hollow shaft connected to the end of the main shaft via a transmission sleeve; a bushing fitted onto the main shaft, and a rear-end mechanical seal fitted onto the bushing, the rear-end mechanical seal being located between the outer wall of the bushing and the inner wall of the central cylinder of the mounting base, the end of the bushing having a protruding stop ring, the front end of the rear-end mechanical seal being tightly fitted against the stop ring. This utility model discloses a mechanically replaceable side-mounted agitator, enabling online replacement of the rear-end mechanical seal.

To provide a circuit breaker (1) for a HV circuit-breaker.SOLUTION: The circuit breaker includes a pair of permanent contacts (24, 41), at least one of them being movable along an axis (AA'); an insulating nozzle (30) having a central cylindrical wall (33) defining a longitudinal cylindrical hole (36), along the axis; and a pair of arcing contacts (22, 42), at least one of them being movable along the axis, a lateral wall of one of the arcing contacts being at a distance from the central cylindrical wall thereby defining a cylindrical volume between the arcing contact and the central cylindrical wall, the arcing contact further comprising at least one inner central channel (220) extending along the axis and along part of the arcing contact, and at least one lateral conduit (26) between the at least one inner channel and at least one lateral hole (27).SELECTED DRAWING: Figure 1A

The invention provides an injection molding machine movable mold assembly which comprises a movable mold plate, a rotating disc and an injection mold, the rotating disc comprises a rotating disc body and a rotating cylinder located on the end face of one side of the rotating disc body, the movable mold plate is provided with a through hole penetrating through the end faces of the two sides of the movable mold plate, and the injection mold is assembled on the end face of the side, away from the rotating cylinder, of the rotating disc body; the rotating cylinder is inserted into the through hole and can be driven to rotate around the central axis of the through hole, the injection mold cooling structure comprises a plurality of cooling hoses, the cooling hoses penetrate through a central cylinder body of the rotating cylinder, and gaps are formed between the cooling hoses and the inner cylinder wall of the rotating cylinder; one end of each cooling hose is communicated with a cooling structure in the injection mold, and the other end of each cooling hose is controllably communicated with a cooling fluid supply source. According to the invention, conduction of heat of cooling fluid to the rotating cylinder and even the turntable body can be obviously reduced, thermal deformation caused by thermal expansion of the rotating cylinder is reduced, and the phenomenon of rotation clamping stagnation and even jamming caused by thermal deformation of the rotating cylinder is avoided.

This utility model relates to the field of sunflower seed screening technology and discloses a sunflower seed processing and screening device, including a central cylinder. Lifting and adjusting components are provided on both sides of the upper end of the central cylinder, and these components are used to adjust the height as needed. A movable pushing component is provided on the inner side of the upper end of the central cylinder, and this movable pushing component is used to push out suspended sunflower seeds. This sunflower seed processing and screening device, by installing the movable pushing component, uses a welded plate to provide an installation position for the inner structure. A drive motor controls the rotation of the drive shaft, which in turn drives a C-shaped bracket for lateral adjustment via two sets of large gear discs. During adjustment, a connecting plate drives a pushing plate to move laterally via a connecting guide plate. Since the pushing plate is in a vertical position, it does not significantly affect the airflow. Through lateral movement, the pushing plate pushes out sunflower seeds suspended in the designated area, which are then discharged and collected by the guide plate.

The utility model belongs to the technical field of air preheaters, and particularly relates to a sealing, energy-saving and efficiency-improving device for a central cylinder of an air preheater, which is characterized in that an outer ring is mounted on a base arranged on the central cylinder, and an inner ring consisting of arc sections is arranged in a chute on the inner side of the outer ring; and the back surface of each arc section is connected with an elastic piece, so that the inner ring is in sealing contact with the outer wall of the central cylinder, air leakage in the air preheater is reduced, and energy conservation and efficiency improvement are facilitated. In the operation process of the air preheater, when the center cylinder shakes, the corresponding arc sections are ejected outwards in the radial direction, and when the center cylinder does not eject the arc sections outwards any more, under the action of the elastic pieces, the arc sections can continue to be in contact with the inner diameter face of the center cylinder again, and therefore the air preheater is prevented from being damaged. The elastic action type sealing structure does not generate a gap with the central cylinder due to the shaking of the central cylinder, so that the effective sealing service life is longer.

The application provides a closed composite structure substrate applied to a space camera, and the optical substrate comprises a central high-stability area, a force-bearing cylinder and a carbon fiber frame plate which are sequentially arranged from inside to outside, and an envelope area of the optical substrate is covered with a skin to form a closed shell structure substrate; the central high-stability area comprises a metal matrix composite central cylinder, and an outer annular surface of the central cylinder is provided with a metal matrix composite main support framework, an auxiliary support framework and a carbon fiber auxiliary support framework; the central high-stability area and the carbon fiber frame plate are both internally filled with isotropic hexagonal flange carbon honeycombs. The central high-stability area composed of the metal matrix composite, the frame plate with the carbon fiber material structure and the honeycomb layout design can guarantee high rigidity and high stability of the substrate, and the weight reduction advantage is remarkable, and the material cost is reduced; the inlay layout of the special-shaped heat pipe, the support structure and the force-bearing cylinder optimizes the size and the precision stability of the whole substrate.

The application provides a coiled tube heat exchanger using spherical clamping strips to fix tube bundles, and belongs to the technical field of heat exchange equipment, and comprises a central cylinder and a plurality of clamping strips with spherical protrusions arranged on the outer wall of the central cylinder. The upper surface of the clamping strip is provided with a spherical protrusion structure, and adjacent spherical protrusions constitute a heat exchange tube positioning element. The spacing between the spherical structures is optimized to match the arrangement of the tube bundles, and the outer surface of the central cylinder is wound with heat exchange tubes. The clamping strip with the spherical protrusion adopts a reverse stamping process in the manufacturing process, so that the processing surface is located on the non-contact side of the heat exchange tube, effectively avoiding direct friction damage of the processing defects to the tube wall. The spherical streamline structure reduces the turbulence intensity when the shell side fluid flows around, effectively reduces the shell side pressure drop while ensuring the positioning accuracy of the heat exchange tube, and improves the heat transfer efficiency of the heat exchanger. The clamping strip with the spherical protrusion omits the independent welding area required by the traditional tube clamp, thereby reducing the material consumption of the clamping strip.

The conveyor belt (24) of an oven system and apparatus (20) is configured into ascending and descending spiral stacks (26) and (28) to define a central cylindrical channel (62). A pair of upper and lower fans (130) and (132) are positioned within the central cylindrical channel (62) to circulate thermal processing fluid in upper and lower circuits vertically through the spiral stacks and also laterally toward the inlet of the fans (130) and (132) to set up upper and lower thermal processing zones in the spiral stacks and circulation routes for the cooking medium through the spiral stacks.

This invention discloses an oil extraction device, including a packer. The packer includes a central cylinder with a first end and a second end. A first sleeve is fitted over the central cylinder. An annular piston is installed in the cavity formed between the first sleeve and the central cylinder, dividing the cavity into a first chamber and a second chamber. A second sleeve is installed in the second chamber. A rubber sleeve is fitted over the central cylinder. A water inlet hole communicating with the first chamber is provided on the side wall of the central cylinder. A third sleeve is installed outside the first sleeve. The third sleeve has a driving member that extends through the first sleeve into the first chamber. A third elastic member is installed between the driving member and the end of the first chamber facing the first end. The third elastic member pushes the third sleeve to move towards the second end. During depressurization, the third sleeve can move towards the rubber sleeve and squeeze the rubber sleeve, thereby increasing the pressure of the rubber sleeve on the first abutment member, accelerating the retraction of the second sleeve, thereby accelerating the discharge of water from the first chamber and accelerating the unsealing speed of the packer.

The utility model discloses an improved sealing gasket, a drainer and a drainage device, the improved sealing gasket is mounted on the edge of an upper end cover of a drainer shell which is detachably arranged in a drainage port of a wash basin, the improved sealing gasket comprises an annular hollow sealing gasket body, and the sealing gasket body is integrally formed by an elastic material; the sealing gasket body comprises a center cylinder allowing a drainer shell to penetrate through and a first elastic sealing edge formed on the periphery of the sealing gasket body. And an annular second elastic sealing edge is arranged on the lower surface of the sealing gasket body between the central cylinder and the first elastic sealing edge. Compared with the prior art, the sealing gasket has the advantages that the first elastic sealing edge and the second elastic sealing edge are arranged on the sealing gasket, and the two elastic sealing edges are matched with each other, so that the adaptability of the sealing gasket is improved. And a vacuum cavity can be formed, and the adsorption capacity of the sealing gasket is improved.

This utility model discloses a suction cup mechanism for transferring large timber boards, including a central cylinder with telescopic horizontal lifting cylinders fixedly connected to both sides. An extension tube is inserted into the other end of each telescopic horizontal lifting cylinder. This suction cup mechanism for transferring large timber boards utilizes an internal thread to activate the rotating cylinder, generating a threaded displacement force on the surface of the extension tube. This, combined with an internal rectangular positioning rod, constrains the rotation direction of the extension tube, causing it to extend and retract outward within the telescopic horizontal lifting cylinder. This allows for adjustment of the distance between the two large suction cups according to different sizes of timber boards. A vacuum pump extracts the gas adsorbed inside the timber boards by the large suction cups, using the pressure difference to firmly adhere the timber boards to the suction cups. This allows for adjustable suction and lifting based on different sizes of timber boards, enabling stable lifting by directly adsorbing the large suction cups onto the stable points of the timber boards.

A return towing head for directional synchronous crossing of a main pipeline and an outer casing, relating to the field of pipeline crossing technology, includes an outer casing, a main pipeline, and a return towing head. Reinforcing plates are welded to the outer wall of the outer casing at equal intervals along the circumference. The return towing head includes a main body, with tie rods evenly spaced along the circumference at the ends of the main body. The tie rods can extend between two reinforcing plates, and a limiting plate is provided at the end of the tie rod. When the outer casing and the return towing head need to connect, the limiting plate is placed horizontally on the reinforcing plates on both sides, thus forming an effective connection. A central cylinder is provided inside the main body, and a top block is slidably mounted radially upward on the central cylinder. One end of the top block can abut against the inner wall of the main pipeline. A drag rod is slidably mounted axially upward on the central cylinder, and the drag rod has a conical portion. The other end of the top block can abut against the conical portion of the drag rod. When the drag rod is dragged outward, the conical portion pushes the top block out and presses it tightly against the inner wall of the main pipeline. Thus, this application achieves synchronous dragging of the outer casing and the main pipeline by the return towing head.

This utility model discloses a replaceable gear, including a gear body, a central cylinder, and an auxiliary mechanism. The gear body has teeth on its exterior and a through hole. The central cylinder is slidably inserted into the inner cavity of the through hole. The central cylinder has an assembly hole inside. The auxiliary mechanism is located on the gear body and is used to fix the central cylinder to the gear body. The auxiliary mechanism includes a positioning seat and a positioning pin. The positioning seat is fixedly connected to the exterior of the central cylinder. This utility model utilizes the mutual cooperation of the central cylinder, assembly hole, positioning seat, positioning pin, and rotating head. Multiple central cylinders are provided, and their internal assembly holes have different sizes. The positioning seat and positioning pin position the central cylinder for installation on the gear body, and the locking pin limits the relative position of the positioning pin and the fixing ring. This facilitates the installation and disassembly of central cylinders with different internal dimensions to adapt to different sized shafts, improving the gear's adaptability.

This invention discloses a pneumatic concave cavity flame stabilization device for an afterburner, comprising a central cylinder, an annular combustion chamber shell, a diffuser, an afterburner shell, a pneumatic concave cavity pipe, and a central cylinder connecting rod. The diffuser fixes the annular combustion chamber shell and the afterburner shell together. The central cylinder is fixed to the center of the annular combustion chamber shell via the central cylinder connecting rod. The pneumatic concave cavity pipe extends through the central cylinder into the afterburner shell. The vertical jet from the pneumatic concave cavity exhaust port of this invention can enhance the recirculation zone and stably maintain a low-speed recirculation vortex under different operating conditions, stabilizing the combustion operating range and reducing the risk of flameout. The vertical jet from the pneumatic concave cavity exhaust port of this invention can entrain fuel and air into the cavity, prolonging the fuel residence time and fundamentally improving combustion efficiency. The vertical jet from the pneumatic concave cavity exhaust port of this invention can fill the low-pressure zone at the rear edge of the cavity, reducing resistance, significantly reducing total pressure loss, and improving engine thrust efficiency.