505 results about "Central cylinder" patented technology

The present invention discloses a hot-end sealing device for an air preheater that compensates for the expansion difference between a sealing sheet and a backing plate, which at least includes a sealing sheet and a backing plate. The sealing sheet is provided with sealing sheet mounting holes distributed along the length direction, and the backing plate is provided with backing plate mounting holes distributed along the length direction. The linear expansion coefficient of the sealing sheet is different from that of the backing plate. The sealing sheet and the backing plate are relatively fixed by clamping bolts that simultaneously pass through the sealing sheet mounting holes and the backing plate mounting holes. One end close to the rotor central cylinder is the expansion starting end, and the clamping bolts at the expansion starting end are fully tightened and fixed, while the remaining clamping bolts are not fully tightened and fixed, so that the sealing sheet and the backing plate freely expand towards the other end close to the rotor outer edge angle steel after being heated. At least one set of two-dimensional guiding mechanisms is arranged between the sealing sheet and the backing plate downstream of the expansion starting end. The above device maximally compensates for the triangular air leakage area at the hot end of the air preheater, significantly reduces the air leakage rate of the air preheater, has good stability and a long service life.

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.

The utility model discloses a balance button and a cup cover using the same, relates to a cup, and aims to solve the problem that a plurality of accessories cannot adapt to a compact installation space due to the fact that the space, used for installing the button and the accessories, of the cup is relatively limited. Comprising a decorative button, a compression spring, a balance rod and a central cylinder, the decorative button is provided with a sleeve, the sleeve is slidably sleeved with the central cylinder, and the compression spring is arranged between the sleeve and the central cylinder; a caulking groove is formed in the closed end of the center cylinder, swing movable sections are arranged at the two ends of the balance rod, the decorative key is provided with a connecting groove, and the swing movable sections are movably embedded in the connecting groove. According to the balance key provided by the utility model, on the premise of preventing inclined clamping, the structure optimization is realized, the additional assembly parts are reduced, the space occupation is effectively reduced, and the compact space assembly requirement of a cup is met.

The embodiment of the present application provides a buffer device for a spent fuel transport container and a spent fuel transport container. The buffer device includes: a base body made of wood and an outer coating for covering the surface of the base body. The base body includes: a central column, which has a first end face perpendicular to the axial direction and a second end face opposite to the first end face; a central ring body, which is arranged on the radial outer side of the central column, and has a third end face perpendicular to the axial direction and a fourth end face opposite to the third end face, the third end face is located on the same side as the first end face and the third end face is arranged flush with the first end face; the fourth end face is located on the same side as the second end face and the second end face protrudes outward from the fourth end face; a first end ring body, which is connected to the third end face, and the inner diameter of the first end ring body is larger than the inner diameter of the central column. The central column, the central ring body and the first end ring body jointly define a receiving groove for accommodating one end of the container body of the spent fuel transport container.

The utility model provides a portable lung type Tesla oxygen supply controller, and belongs to the technical field of control valves. The lower part of the fixing seat is tightly matched with a portable oxygen bottle opening; the lower part of the valve seat is fixedly connected with the upper part of the fixing seat; an outlet valve on a portable oxygen bottle opening penetrates through a central hole of the lower inner cavity of the fixed seat and enters a central cylindrical hole of the lower inner cavity of the valve seat to form an oxygen outlet channel; a Tesla valve element is installed in an inner cavity in the upper portion of the valve seat, a pressing seat is clamped into the inner cavity in the upper portion of the valve seat to press the Tesla valve element, a steel ball containing inner cavity is formed in the center in the pressing seat, a valve port is formed in the center of the bottom face of the steel ball containing inner cavity, and a steel ball used for opening and closing the valve port is placed in the steel ball containing inner cavity. The upper cover is fixedly connected to the upper portion of the valve seat to press the pressing seat and enable the steel ball containing inner cavity to form a sealed space, and the upper portion of the upper cover is connected with a face cover. The portable oxygen supply device is installed on the bottle opening of the portable oxygen supply device in a matched mode, and the oxygen using time of one bottle of the portable oxygen supply device can be prolonged to 40 min.

The invention relates to the related technical field of pneumatic actuators, and discloses a shifting fork type pneumatic actuator based on modular design, which comprises a driving box and a cylinder body, a piston is slidably arranged in the cylinder body, a driving rod is fixedly arranged on one side, facing a driving cavity, of the piston, a sliding shaft is fixedly arranged at the end part of the driving rod, and a shaft hole is formed in the side wall of the driving cavity; a driving shaft is rotatably arranged in the shaft hole, a central cylinder is arranged in the driving cavity, the central cylinder is fixedly sleeved with a fixing sleeve, the fixing sleeve is fixedly provided with a crank, a driving sliding groove is formed in the crank, a sliding shaft slides in the driving sliding groove, and a transmission outer cavity and a transmission inner cavity which are communicated with each other are formed in the driving shaft; according to the device, the normally-open or normally-closed state of the two switching valves can be adjusted, a mechanism of the pneumatic actuator does not need to be changed, or the position of the pneumatic actuator does not need to be adjusted, and operation is easy and fast.

The invention relates to a liquid-cooled casing, a magnetic suspension motor and magnetic suspension equipment, the liquid-cooled casing comprises a casing main body and a base, and the casing main body comprises an annular shell, a central cylinder and a first bottom plate which define an annular space; the base comprises a second bottom plate and a central column, a first liquid cooling cavity is formed in the annular shell, one end of the central cylinder is an open end, and the other end of the central cylinder is a closed end; the edge of the second bottom plate is fixedly connected with one end of the annular shell in a sealed mode, the center column penetrates through the center cylinder, a second liquid cooling cavity is formed between the outer wall of the center column and the inner wall of the center cylinder, and a first circulation opening and a second circulation opening which are spaced are formed in the second bottom plate. The first circulation port is communicated with one part of the first liquid cooling cavity and one part of the second liquid cooling cavity, and the second circulation port is communicated with the second part of the first liquid cooling cavity and the second part of the second liquid cooling cavity. The cooling effect of the magnetic suspension motor is improved, and the heat dissipation requirements of special working environments such as high cleanliness can be better met.

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).

A winding tube type heat exchanger is vertically arranged, a shell pass and a tube pass are arranged in the winding tube type heat exchanger, a heat exchange tube forming the tube pass is spirally wound around the periphery of a center cylinder in the vertical direction, and the tube pass is provided with a tube pass inlet for cold medium input and a tube pass outlet for cold medium output after heat exchange; the upper part of the shell side is provided with a shell side inlet for inputting a medium to be condensed, and the lower part of the shell side is provided with a cavity for receiving condensate and a shell side liquid phase outlet for outputting the condensate in the cavity; meanwhile, the upper portion of the shell pass is provided with a shell pass gas phase outlet for outputting non-condensable gas, the interior of the center cylinder is hollow to form an independent channel extending vertically, a lower port of the independent channel is located above the cavity so that the non-condensable gas can pass upwards and enter the independent channel, and an upper port of the independent channel is communicated with the shell pass gas phase outlet. The condenser can be used for condensing media such as overhead gas and the like, and the number of downstream equipment can be reduced.

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.

A winding pipe type heat exchanger comprises a shell pass cylinder, a winding pipe, a winding pipe, a winding pipe and a winding pipe, and pipe plates are arranged at the ends of the shell pass cylinder; the central cylinder is arranged in the shell pass cylinder along the axial direction; the heat exchange tubes are axially arranged in the shell pass cylinder and spirally wound on the periphery of the central cylinder from inside to outside to form a multi-layer spiral tube, each layer of spiral tube is provided with a straight tube section, a cone section and a spiral section, the tube diameter of the spiral section is larger than that of the straight tube section, the straight tube section, the cone section and the spiral section are sequentially arranged in the axial direction, and the end of the straight tube section is supported on the tube plate; the spiral tube heat exchanger further comprises a limiting plate located in the shell pass barrel, the side edge of the limiting plate is opposite to the inner circumferential face of the shell pass barrel in a spaced mode, and meanwhile the limiting plate is provided with a plurality of through holes penetrating through the plate thickness so that straight tube sections of all layers of spiral tubes can be inserted into the through holes. Compared with the prior art, vibration of the heat exchange tube during use can be avoided, and heat exchange is basically not affected.

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 invention relates to the technical field of fireproof cables, in particular to an environment-friendly high-flame-retardant flexible fireproof cable, and solves the problem that the fireproof cable is easy to break or damage when being bent due to the fact that high-temperature-resistant and flame-retardant materials are added to the fireproof cable and the flexibility of the cable is reduced. The environment-friendly high-flame-retardant flexible fireproof cable comprises an insulating protective sleeve, and is characterized in that the inner side of the insulating protective sleeve is provided with a heat-insulating flame-retardant protective sleeve, the inner side of the heat-insulating flame-retardant protective sleeve is provided with an armored protective sleeve, the inner side of the armored protective sleeve is provided with an insulating shielding sleeve, and the outer side of the insulating shielding sleeve is provided with a fireproof layer. A cable core torsion protection sleeve and a plurality of cable cores are inserted into the inner side of the insulation shielding sleeve. According to the invention, the cable core is spirally wound outside the central cylindrical block, so that when the cable is stretched or bent, the spirally wound cable core can counteract the stretching force and the bending force, thereby preventing the cable core from being damaged or broken due to the stretching or bending of the cable.

The core structure of the heat exchanger, the wound tube heat exchanger and the EO / EG device, the core structure includes: a central tube; a heat exchange tube, having a spiral section, a straight tube section and a connecting section, and the outer diameter of the heat exchange tube is recorded as R; the connecting section has: a first arc section arched outward relative to the side wall of the central tube, the first end of the first arc section smoothly connects with the end of the spiral section, and the bending radius of the first arc section is recorded as R1, satisfying: 10R<R1<30R; a second arc section arched inward toward the side wall of the central tube, the first end of the second arc section smoothly connects with the end of the corresponding straight tube section, the second end of the second arc section smoothly connects with the second end of the first arc section, and the bending radius of the second arc section is recorded as R2, satisfying: 10R<R2<30R. The utility model can prevent the tube-side medium from forming vortices in the heat exchange tube.

The utility model discloses a core body structure of a winding pipe type heat exchanger and the winding pipe type heat exchanger. The heat exchange tube extends along the axial direction of the central cylinder and is spirally wound on the periphery of the central cylinder layer by layer from inside to outside to form a multi-layer spiral tube; the peripheral wall of the annular sound absorption cylinder is enclosed to form a sound absorption cavity with two open ends, and the peripheral wall of the annular sound absorption cylinder is arranged between two adjacent layers of spiral pipes in the circumferential direction. During heat exchange, the sound absorption barrel can absorb noise generated during heat exchange of the inner surrounding core body structure, and the noise reduction effect is achieved; meanwhile, due to the fact that the two ends of the sound absorption cylinder are open, a shell pass medium for heat exchange can enter and exit from the sound absorption cylinder for heat exchange, and normal heat exchange work of the core structure is not affected.

The invention provides a puncture device with a drainage tube fixing function, which comprises a central cylinder, a flow filling bag, a blocking ring, a cover body, a fixing structure and an encircling hole, wherein a central through hole is formed in the central cylinder and is used for puncturing and placing a drainage tube; an annular cavity is formed in the inner wall of the center cylinder and used for adjusting the supporting state of the center cylinder. A flow filling bag is arranged at the first end of the central cylinder, a blocking ring is arranged at the second end of the central cylinder, the flow filling bag is used for being arranged in the body of a patient, and the blocking ring is used for being arranged outside the body of the patient; a cover body is arranged at the end, away from the central cylinder body, of the blocking ring, a fixing structure is arranged on the cover body, the fixing structure is used for fixing the drainage tube, an encircling hole is formed in the fixing structure, and the encircling hole is used for adjusting the fixing tightness degree of the drainage tube. The puncture device can be used for puncturing, and meanwhile, the drainage tube is convenient to place, so that the drainage tube is fixed more stably.

The invention discloses a high-pressure hydrogen storage cavern lining structure three-dimensional model test and monitoring system and method, and the system comprises a test loading system, a dynamic monitoring system, and a control system. The three-dimensional model test loading system comprises an annular frame type counter-force supporting structure used for providing external surrounding rock constraint counter-force support, a central cylinder pressure-bearing counter-force device coaxially nested in an annular frame and used for applying an internal high-pressure load, and a distributed servo loading unit array. The dynamic monitoring system comprises a contact type load monitoring module, an internal deformation monitoring module and a fluid pressure closed-loop monitoring module used for feeding back internal water pressure in real time. The control system can preset a stiffness coefficient or a surrounding rock displacement-counter-force change curve according to surrounding rock characteristics and test requirements, and monitors data to adjust the pressure value of the actuator in real time, so as to realize dynamic force-displacement tracking control; through integration of loading, monitoring and control functions, the cooperative deformation response characteristics of the surrounding rock and the structure of the energy storage artificial cavern are truly simulated, and the consistency of the test and the actual working condition is improved.

The invention relates to the technical field of welding equipment, in particular to a clamping and positioning device for centrifugal pump impeller welding, which comprises a split base, a chassis and a pressure plate, shallow inclined blade clamping grooves are annularly formed in the chassis, and the pressure plate and the chassis are assembled in a matched manner and used for loading a hub; the blade clamping mechanism is used for fixing blades, a mounting base is arranged at the end of each blade clamping groove in the base plate, an arc-shaped inner clamping strip and an arc-shaped outer clamping strip are slidably mounted on the mounting bases, and the inner clamping strips and the outer clamping strips are kept in a discrete state through first springs. A kneading assembly is arranged on the mounting seat and is used for controlling the aggregation of the inner clamping strip and the outer clamping strip; the magnetic driving mechanism is used for driving the inner clamping strips and the outer clamping strips to gather, a center cylinder is arranged in the middle of the chassis, a rotating disc with a push rod is rotationally installed on the center cylinder, the rotating disc drives the kneading assembly when rotating, and the rotating disc can be driven to rotate through magnetic coupling when the pressing disc is assembled; the purposes of facilitating material taking after welding and preventing deformation are achieved.

The utility model discloses sewage treatment equipment, which relates to the technical field of sewage treatment and comprises a reactor main body as well as a water decanter, an aeration head and a liquid level sensor which are arranged in the reactor main body. An air source box is arranged at the top of the reactor main body, and an air pump is arranged in the air source box and used for supplying air to the aeration head; a filler layer is arranged at the lower part of the reactor main body, a vertically communicated central cylinder is arranged at the center of the filler layer, and the aeration head is suspended in the central cylinder. A density difference is generated inside and outside the central cylinder during aeration, so that sewage circularly flows through the filler layer, and dissolved oxygen is also provided for microorganisms attached to and growing on the filler layer along with flowing of the sewage, so that the sewage can be effectively purified.

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 a tower foundation structure for preventing and controlling freeze-thaw deformation in a seasonal frozen soil area and a construction method. In the tower foundation structure, the lower portion of a pile body is connected with the top of a center cylinder through a hydraulic damper, the outer side of the bottom of the center cylinder is sleeved with an isolation cylinder, a conical cylinder is fixedly connected to the top of the isolation cylinder, and the conical cylinder is slidably connected to the outer side of the top of the center cylinder; the periphery of the central cylinder is fixedly connected with an upper inclined strut which is inclined upwards and a lower inclined strut which is inclined downwards; the end parts of the upper inclined strut and the lower inclined strut are movably inserted into through holes in the side wall of the isolation cylinder respectively; the bottom of the isolation cylinder is fixedly connected with a base, a lock pin is fixed to the upper portion of the base, the bottom of the center cylinder is hollow to form a center cylinder cavity allowing the lock pin to be inserted, the lock pin is slidably connected with the bottom of the center cylinder through the center cylinder cavity, a gap is reserved between the bottom of the center cylinder and the base, the hydraulic damper forms first-level prevention and control, and the upper inclined strut and the lower inclined strut form second-level prevention and control. The conical barrels form three-stage prevention and control, and the three stages of prevention and control work together to achieve whole-process control over frost heaving and thaw collapse deformation.

The invention relates to the field of chemical engineering, in particular to a mixing device for flame retardant raw material processing. The top of the center cylinder is closed, and a feeding mechanism is arranged at the bottom of the center cylinder; the side cylinders are obliquely arranged on the two sides of the center cylinder to form a V-shaped structure, and the tops of the side cylinders are closed; the rotating rod is rotationally arranged on the supporting seat and connected with the outer wall of the side barrel, and a power mechanism for driving the rotating rod to rotate is arranged on the supporting seat; the side barrel discharging mechanism is arranged in the side barrel and is used for intensifying stirring and scraping the inner wall of the side barrel to complete auxiliary discharging; the elastic ring is located at the top of the inner side of the center cylinder and makes contact with the inner wall of the center cylinder, and a center cylinder discharging mechanism driving the elastic ring to move up and down is arranged on the center cylinder. According to the device, the feeding mechanism is arranged, so that feeding and discharging are more convenient, and the single-time mixing amount of the whole device can also be increased; and during discharging, the inner walls of the side cylinders and the center cylinder can be scraped, so that discharging is more sufficient.

The invention discloses an integrated micro-bubble generator which comprises a shell, cover plates are arranged at the upper end and the lower end of the shell, a gas phase inlet is formed in the side wall of the shell, a plurality of micro-bubble generating structures are arranged in the shell, and each micro-bubble generating structure comprises a shell. A liquid inlet area inner part, a gas suction area inner part, a mixing area inner part and a crushing area nozzle are sequentially arranged in the shell in the liquid flowing direction. The air suction area inner piece comprises a center cylinder, a rotational flow plate is arranged on the outer wall of the lower end of the center cylinder, and the shell wall, corresponding to the center cylinder, of the shell is integrally arranged to be a micropore pipe. The mixing area inner piece comprises a conical center assembly, a spiral plate is arranged on the center assembly, and the wall face, corresponding to the mixing area inner piece, of the shell has a certain gradient and is in an uneven shape. The micro-nano bubble generator is simple in structure and convenient to maintain, micro-nano bubbles can be stably generated, the gas-liquid mixing mass transfer efficiency is improved, and the problems that in the prior art, energy consumption is high, and bubbles are large and unstable are solved.

The invention discloses an anaerobic ammonia oxidation biological filler and a water treatment system, the anaerobic ammonia oxidation biological filler comprises a central cylinder, a plurality of stand columns circumferentially distributed on the periphery of the central cylinder, and a plurality of fillers circumferentially distributed on the periphery of the central cylinder, the fillers are V-shaped, the tip ends are connected with the stand columns and / or the central cylinder, and the top ends of the fillers are connected with the stand columns and / or the central cylinder. The central cylinder of the anaerobic ammonia oxidation biological filler is a cylinder or a square cylinder and is fixed through stress of the central cylinder, the filler is simple and practical, the filler and the stand columns are distributed in a staggered or overlapped mode, the filler is connected through the stand columns, disassembly, replacement and maintenance after dispersion transportation and assembly are facilitated, and the filler is fixed to the central cylinder through the stand columns to form a radial structure. Further, the contact area of the filler is increased and the specific area is increased.

The invention belongs to the field of detonation engines, and particularly relates to a metal-based gel propellant detonation engine which comprises an air inlet channel, a rotary detonation combustion chamber and a propellant supply system. The propellant supply system comprises a gel propellant storage box arranged in the central cylinder, a gel propelling structure connected with the gel propellant storage box and an atomizing nozzle, and the atomizing nozzle is mounted on the propellant injection structure; the propellant supply system further comprises an atomized gas storage box arranged in the combustion chamber cylinder, and the atomized gas storage box is connected with the atomizing nozzle through an atomized gas conveying channel. According to the rotary detonation engine, the metal-based gel propellant is applied to the rotary detonation engine, the energy density is superior to that of an existing gas and liquid propellant rotary detonation engine, safety is high, and thrust output is controllable. And the propellant supply system does not occupy the space outside the engine at all, and the gel propellant rotary detonation engine with a good effect is achieved under the condition that the size of the engine is not additionally increased.

The invention relates to the technical field of fan impeller machining, in particular to a fan impeller machining device which comprises a center cylinder, a clamping mechanism, a torsion angle unit and a placing unit. The deflection angle between the adjusting column and the fixed column is the torsion angle of the profile, the torsion angle of the profile is adjusted by adjusting the distance between the adjusting column and the fixed column, the requirements of different torsion angles are met conveniently, the rotation range of the torsion angle strip is limited through the adjusting column, the stability of the torsion operation process is improved, and the torsion efficiency is improved. The torsion angle of the profile is ensured to be the required angle, torsion operation at multiple positions is carried out at the same time through the same drive, placement and clamping of the profiles are also carried out through the same drive, the torsion angle operation efficiency is improved, meanwhile, the torsion angle error between the blades is reduced, and therefore the error between the blades in the torsion process is reduced, and the torsion efficiency of the blades is improved. The same torsional angle of each blade is ensured, and a plurality of profiles work simultaneously, so that the overall working efficiency is improved.

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.